7117167: Misc warnings in java.lang.invoke and sun.invoke.*

Reviewed-by: smarks

src/share/classes/java/lang/invoke/AdapterMethodHandle.java

@@ -378,6 +378,7 @@ class AdapterMethodHandle extends BoundMethodHandle {
     }
 
     /** Construct an adapter conversion descriptor for a single-argument conversion. */
+    @SuppressWarnings("cast")  // some (int) casts below provide clarity but trigger warnings
     private static long makeConv(int convOp, int argnum, int src, int dest) {
         assert(src  == (src  & CONV_TYPE_MASK));
         assert(dest == (dest & CONV_TYPE_MASK));
@@ -390,6 +391,7 @@ class AdapterMethodHandle extends BoundMethodHandle {
                 insertStackMove(stackMove)
                 );
     }
+    @SuppressWarnings("cast")  // some (int) casts below provide clarity but trigger warnings
     private static long makeDupConv(int convOp, int argnum, int stackMove) {
         // simple argument motion, requiring one slot to specify
         assert(convOp == OP_DUP_ARGS || convOp == OP_DROP_ARGS);
@@ -401,6 +403,7 @@ class AdapterMethodHandle extends BoundMethodHandle {
                 insertStackMove(stackMove)
                 );
     }
+    @SuppressWarnings("cast")  // some (int) casts below provide clarity but trigger warnings
     private static long makeSwapConv(int convOp, int srcArg, byte srcType, int destSlot, byte destType) {
         // more complex argument motion, requiring two slots to specify
         assert(convOp == OP_SWAP_ARGS || convOp == OP_ROT_ARGS);
@@ -411,6 +414,7 @@ class AdapterMethodHandle extends BoundMethodHandle {
                 (int)  destSlot << CONV_VMINFO_SHIFT
                 );
     }
+    @SuppressWarnings("cast")  // some (int) casts below provide clarity but trigger warnings
     private static long makeSpreadConv(int convOp, int argnum, int src, int dest, int stackMove) {
         // spreading or collecting, at a particular slot location
         assert(convOp == OP_SPREAD_ARGS || convOp == OP_COLLECT_ARGS || convOp == OP_FOLD_ARGS);

src/share/classes/java/lang/invoke/MemberName.java

@@ -353,7 +353,7 @@ import static java.lang.invoke.MethodHandleStatics.*;
         assert(isResolved());
     }
     /** Create a name for the given reflected constructor.  The resulting name will be in a resolved state. */
-    public MemberName(Constructor ctor) {
+    public MemberName(Constructor<?> ctor) {
         Object[] typeInfo = { void.class, ctor.getParameterTypes() };
         init(ctor.getDeclaringClass(), CONSTRUCTOR_NAME, typeInfo, flagsMods(IS_CONSTRUCTOR, ctor.getModifiers()));
         // fill in vmtarget, vmindex while we have ctor in hand:

src/share/classes/java/lang/invoke/MethodHandleImpl.java

@@ -112,7 +112,7 @@ import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP;
         assert(cookedConstructor.type().equals(ctype));
         ctype = ctype.dropParameterTypes(0, 1);
         cookedConstructor = AdapterMethodHandle.makeCollectArguments(cookedConstructor, returner, 0, true);
-        MethodHandle allocator = new AllocateObject(allocateClass);
+        AllocateObject allocator = new AllocateObject(allocateClass);
         // allocate() => new C(void)
         assert(allocator.type().equals(MethodType.methodType(allocateClass)));
         ctype = ctype.dropParameterTypes(0, 1);
@@ -120,19 +120,19 @@ import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP;
         return fold;
     }
 
-    static final class AllocateObject<C> extends BoundMethodHandle {
+    static final class AllocateObject /*<C>*/ extends BoundMethodHandle {
         private static final Unsafe unsafe = Unsafe.getUnsafe();
 
-        private final Class<C> allocateClass;
+        private final Class<?> /*<C>*/ allocateClass;
 
         // for allocation only:
-        private AllocateObject(Class<C> allocateClass) {
+        private AllocateObject(Class<?> /*<C>*/ allocateClass) {
             super(ALLOCATE.asType(MethodType.methodType(allocateClass, AllocateObject.class)));
             this.allocateClass = allocateClass;
         }
         @SuppressWarnings("unchecked")
-        private C allocate() throws InstantiationException {
-            return (C) unsafe.allocateInstance(allocateClass);
+        private Object /*C*/ allocate() throws InstantiationException {
+            return unsafe.allocateInstance(allocateClass);
         }
         static final MethodHandle ALLOCATE;
         static {
@@ -148,8 +148,8 @@ import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP;
     MethodHandle accessField(MemberName member, boolean isSetter,
                              Class<?> lookupClass) {
         // Use sun. misc.Unsafe to dig up the dirt on the field.
-        MethodHandle mh = new FieldAccessor(member, isSetter);
-        return mh;
+        FieldAccessor accessor = new FieldAccessor(member, isSetter);
+        return accessor;
     }
 
     static
@@ -175,7 +175,7 @@ import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP;
         return mhs[isSetter ? 1 : 0];
     }
 
-    static final class FieldAccessor<C,V> extends BoundMethodHandle {
+    static final class FieldAccessor /*<C,V>*/ extends BoundMethodHandle {
         private static final Unsafe unsafe = Unsafe.getUnsafe();
         final Object base;  // for static refs only
         final long offset;
@@ -190,26 +190,24 @@ import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP;
         @Override
         String debugString() { return addTypeString(name, this); }
 
-        int getFieldI(C obj) { return unsafe.getInt(obj, offset); }
-        void setFieldI(C obj, int x) { unsafe.putInt(obj, offset, x); }
-        long getFieldJ(C obj) { return unsafe.getLong(obj, offset); }
-        void setFieldJ(C obj, long x) { unsafe.putLong(obj, offset, x); }
-        float getFieldF(C obj) { return unsafe.getFloat(obj, offset); }
-        void setFieldF(C obj, float x) { unsafe.putFloat(obj, offset, x); }
-        double getFieldD(C obj) { return unsafe.getDouble(obj, offset); }
-        void setFieldD(C obj, double x) { unsafe.putDouble(obj, offset, x); }
-        boolean getFieldZ(C obj) { return unsafe.getBoolean(obj, offset); }
-        void setFieldZ(C obj, boolean x) { unsafe.putBoolean(obj, offset, x); }
-        byte getFieldB(C obj) { return unsafe.getByte(obj, offset); }
-        void setFieldB(C obj, byte x) { unsafe.putByte(obj, offset, x); }
-        short getFieldS(C obj) { return unsafe.getShort(obj, offset); }
-        void setFieldS(C obj, short x) { unsafe.putShort(obj, offset, x); }
-        char getFieldC(C obj) { return unsafe.getChar(obj, offset); }
-        void setFieldC(C obj, char x) { unsafe.putChar(obj, offset, x); }
-        @SuppressWarnings("unchecked")
-        V getFieldL(C obj) { return (V) unsafe.getObject(obj, offset); }
-        @SuppressWarnings("unchecked")
-        void setFieldL(C obj, V x) { unsafe.putObject(obj, offset, x); }
+        int getFieldI(Object /*C*/ obj) { return unsafe.getInt(obj, offset); }
+        void setFieldI(Object /*C*/ obj, int x) { unsafe.putInt(obj, offset, x); }
+        long getFieldJ(Object /*C*/ obj) { return unsafe.getLong(obj, offset); }
+        void setFieldJ(Object /*C*/ obj, long x) { unsafe.putLong(obj, offset, x); }
+        float getFieldF(Object /*C*/ obj) { return unsafe.getFloat(obj, offset); }
+        void setFieldF(Object /*C*/ obj, float x) { unsafe.putFloat(obj, offset, x); }
+        double getFieldD(Object /*C*/ obj) { return unsafe.getDouble(obj, offset); }
+        void setFieldD(Object /*C*/ obj, double x) { unsafe.putDouble(obj, offset, x); }
+        boolean getFieldZ(Object /*C*/ obj) { return unsafe.getBoolean(obj, offset); }
+        void setFieldZ(Object /*C*/ obj, boolean x) { unsafe.putBoolean(obj, offset, x); }
+        byte getFieldB(Object /*C*/ obj) { return unsafe.getByte(obj, offset); }
+        void setFieldB(Object /*C*/ obj, byte x) { unsafe.putByte(obj, offset, x); }
+        short getFieldS(Object /*C*/ obj) { return unsafe.getShort(obj, offset); }
+        void setFieldS(Object /*C*/ obj, short x) { unsafe.putShort(obj, offset, x); }
+        char getFieldC(Object /*C*/ obj) { return unsafe.getChar(obj, offset); }
+        void setFieldC(Object /*C*/ obj, char x) { unsafe.putChar(obj, offset, x); }
+        Object /*V*/ getFieldL(Object /*C*/ obj) { return unsafe.getObject(obj, offset); }
+        void setFieldL(Object /*C*/ obj, Object /*V*/ x) { unsafe.putObject(obj, offset, x); }
         // cast (V) is OK here, since we wrap convertArguments around the MH.
 
         static Object staticBase(final MemberName field) {
@@ -244,8 +242,9 @@ import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP;
         void setStaticS(short x) { unsafe.putShort(base, offset, x); }
         char getStaticC() { return unsafe.getChar(base, offset); }
         void setStaticC(char x) { unsafe.putChar(base, offset, x); }
-        V getStaticL() { return (V) unsafe.getObject(base, offset); }
-        void setStaticL(V x) { unsafe.putObject(base, offset, x); }
+        @SuppressWarnings("unchecked")  // (V) is for internal clarity but triggers warning
+        Object /*V*/ getStaticL() { return unsafe.getObject(base, offset); }
+        void setStaticL(Object /*V*/ x) { unsafe.putObject(base, offset, x); }
 
         static String fname(Class<?> vclass, boolean isSetter, boolean isStatic) {
             String stem;

src/share/classes/java/lang/invoke/MethodHandleProxies.java

@@ -150,7 +150,7 @@ public class MethodHandleProxies {
         }
         return intfc.cast(Proxy.newProxyInstance(
                 intfc.getClassLoader(),
-                new Class[]{ intfc, WrapperInstance.class },
+                new Class<?>[]{ intfc, WrapperInstance.class },
                 new InvocationHandler() {
                     private Object getArg(String name) {
                         if ((Object)name == "getWrapperInstanceTarget")  return target;

src/share/classes/java/lang/invoke/MethodHandles.java

@@ -1006,6 +1006,7 @@ return mh1;
          *                                is set and {@code asVarargsCollector} fails
          * @throws NullPointerException if the argument is null
          */
+        @SuppressWarnings("rawtypes")  // Will be Constructor<?> after JSR 292 MR
         public MethodHandle unreflectConstructor(Constructor c) throws IllegalAccessException {
             MemberName ctor = new MemberName(c);
             assert(ctor.isConstructor());

src/share/classes/sun/invoke/util/ValueConversions.java

@@ -55,9 +55,9 @@ public class ValueConversions {
     private static final Lookup IMPL_LOOKUP = MethodHandles.lookup();
 
     private static EnumMap<Wrapper, MethodHandle>[] newWrapperCaches(int n) {
-        @SuppressWarnings("unchecked")
+        @SuppressWarnings("unchecked")  // generic array creation
         EnumMap<Wrapper, MethodHandle>[] caches
-                = (EnumMap<Wrapper, MethodHandle>[]) new EnumMap[n];  // unchecked warning expected here
+                = (EnumMap<Wrapper, MethodHandle>[]) new EnumMap<?,?>[n];
         for (int i = 0; i < n; i++)
             caches[i] = new EnumMap<>(Wrapper.class);
         return caches;
@@ -1097,7 +1097,7 @@ public class ValueConversions {
     }
 
     private static MethodHandle buildNewArray(int nargs) {
-        return MethodHandles.insertArguments(NEW_ARRAY, 0, (int) nargs);
+        return MethodHandles.insertArguments(NEW_ARRAY, 0, nargs);
     }
 
     private static final MethodHandle[] FILLERS = new MethodHandle[MAX_ARITY+1];
@@ -1122,7 +1122,7 @@ public class ValueConversions {
         }
         MethodHandle leftFill = filler(leftLen);  // recursive fill
         MethodHandle rightFill = FILL_ARRAYS[rightLen];
-        rightFill = MethodHandles.insertArguments(rightFill, 1, (int) leftLen);  // [leftLen..nargs-1]
+        rightFill = MethodHandles.insertArguments(rightFill, 1, leftLen);  // [leftLen..nargs-1]
 
         // Combine the two fills: right(left(newArray(nargs), x1..x20), x21..x23)
         MethodHandle mh = filler(0);  // identity function produces result

src/share/classes/sun/invoke/util/Wrapper.java

@@ -31,7 +31,7 @@ public enum Wrapper {
     BYTE(Byte.class, byte.class, 'B', (Byte)(byte)0, new byte[0], Format.signed(8)),
     SHORT(Short.class, short.class, 'S', (Short)(short)0, new short[0], Format.signed(16)),
     CHAR(Character.class, char.class, 'C', (Character)(char)0, new char[0], Format.unsigned(16)),
-    INT(Integer.class, int.class, 'I', (Integer)(int)0, new int[0], Format.signed(32)),
+    INT(Integer.class, int.class, 'I', (Integer)/*(int)*/0, new int[0], Format.signed(32)),
     LONG(Long.class, long.class, 'J', (Long)(long)0, new long[0], Format.signed(64)),
     FLOAT(Float.class, float.class, 'F', (Float)(float)0, new float[0], Format.floating(32)),
     DOUBLE(Double.class, double.class, 'D', (Double)(double)0, new double[0], Format.floating(64)),
@@ -539,7 +539,7 @@ public enum Wrapper {
         switch (basicTypeChar) {
             case 'L': throw newIllegalArgumentException("cannot wrap to object type");
             case 'V': return null;
-            case 'I': return Integer.valueOf((int)x);
+            case 'I': return Integer.valueOf(x);
             case 'J': return Long.valueOf(x);
             case 'F': return Float.valueOf(x);
             case 'D': return Double.valueOf(x);

test/java/lang/invoke/CallSiteTest.java

@@ -43,7 +43,7 @@ import static java.lang.invoke.MethodHandles.*;
 import static java.lang.invoke.MethodType.*;
 
 public class CallSiteTest {
-    private final static Class CLASS = CallSiteTest.class;
+    private final static Class<?> CLASS = CallSiteTest.class;
 
     private static CallSite mcs;
     private static CallSite vcs;

test/java/lang/invoke/ClassValueTest.java

@@ -38,10 +38,6 @@
 
 package test.java.lang.invoke;
 
-import java.util.*;
-
-import java.lang.invoke.*;
-
 import org.junit.*;
 import static org.junit.Assert.*;
 

test/java/lang/invoke/InvokeGenericTest.java

@@ -45,6 +45,7 @@ import static org.junit.Assume.*;
  *
  * @author jrose
  */
+@SuppressWarnings("cast")  // various casts help emphasize arguments to invokeExact
 public class InvokeGenericTest {
     // How much output?
     static int verbosity = 0;
@@ -129,7 +130,7 @@ public class InvokeGenericTest {
         }
     }
 
-    static List<Object> calledLog = new ArrayList<Object>();
+    static List<Object> calledLog = new ArrayList<>();
     static Object logEntry(String name, Object... args) {
         return Arrays.asList(name, Arrays.asList(args));
     }
@@ -237,8 +238,7 @@ public class InvokeGenericTest {
         else
             try {
                 return param.newInstance();
-            } catch (InstantiationException ex) {
-            } catch (IllegalAccessException ex) {
+            } catch (InstantiationException | IllegalAccessException ex) {
             }
         return null;  // random class not Object, String, Integer, etc.
     }
@@ -274,9 +274,11 @@ public class InvokeGenericTest {
         return zeroArgs(params.toArray(new Class<?>[0]));
     }
 
+    @SafeVarargs @SuppressWarnings("varargs")
     static <T, E extends T> T[] array(Class<T[]> atype, E... a) {
         return Arrays.copyOf(a, a.length, atype);
     }
+    @SafeVarargs @SuppressWarnings("varargs")
     static <T> T[] cat(T[] a, T... b) {
         int alen = a.length, blen = b.length;
         if (blen == 0)  return a;
@@ -311,7 +313,7 @@ public class InvokeGenericTest {
             int beg, int end, Class<?> argType) {
         MethodType targetType = target.type();
         end = Math.min(end, targetType.parameterCount());
-        ArrayList<Class<?>> argTypes = new ArrayList<Class<?>>(targetType.parameterList());
+        ArrayList<Class<?>> argTypes = new ArrayList<>(targetType.parameterList());
         Collections.fill(argTypes.subList(beg, end), argType);
         MethodType ttype2 = MethodType.methodType(targetType.returnType(), argTypes);
         return target.asType(ttype2);
@@ -320,7 +322,7 @@ public class InvokeGenericTest {
     // This lookup is good for all members in and under InvokeGenericTest.
     static final Lookup LOOKUP = MethodHandles.lookup();
 
-    Map<List<Class<?>>, MethodHandle> CALLABLES = new HashMap<List<Class<?>>, MethodHandle>();
+    Map<List<Class<?>>, MethodHandle> CALLABLES = new HashMap<>();
     MethodHandle callable(List<Class<?>> params) {
         MethodHandle mh = CALLABLES.get(params);
         if (mh == null) {
@@ -353,8 +355,8 @@ public class InvokeGenericTest {
         countTest();
         String[] args = { "one", "two" };
         MethodHandle mh = callable(Object.class, String.class);
-        Object res; List resl;
-        res = resl = (List) mh.invoke((String)args[0], (Object)args[1]);
+        Object res; List<?> resl;
+        res = resl = (List<?>) mh.invoke((String)args[0], (Object)args[1]);
         //System.out.println(res);
         assertEquals(Arrays.asList(args), res);
     }
@@ -365,8 +367,8 @@ public class InvokeGenericTest {
         countTest();
         int[] args = { 1, 2 };
         MethodHandle mh = callable(Object.class, Object.class);
-        Object res; List resl;
-        res = resl = (List) mh.invoke(args[0], args[1]);
+        Object res; List<?> resl;
+        res = resl = (List<?>) mh.invoke(args[0], args[1]);
         //System.out.println(res);
         assertEquals(Arrays.toString(args), res.toString());
     }
@@ -377,8 +379,8 @@ public class InvokeGenericTest {
         countTest();
         String[] args = { "one", "two" };
         MethodHandle mh = callable(Object.class, String.class);
-        Object res; List resl;
-        res = resl = (List) mh.invoke((String)args[0], (Object)args[1]);
+        Object res; List<?> resl;
+        res = resl = (List<?>) mh.invoke((String)args[0], (Object)args[1]);
         //System.out.println(res);
         assertEquals(Arrays.asList(args), res);
     }
@@ -440,9 +442,9 @@ public class InvokeGenericTest {
      *  A void return type is possible iff the first type is void.class.
      */
     static List<MethodType> allMethodTypes(int minargc, int maxargc, Class<?>... types) {
-        ArrayList<MethodType> result = new ArrayList<MethodType>();
+        ArrayList<MethodType> result = new ArrayList<>();
         if (types.length > 0) {
-            ArrayList<MethodType> argcTypes = new ArrayList<MethodType>();
+            ArrayList<MethodType> argcTypes = new ArrayList<>();
             // build arity-zero types first
             for (Class<?> rtype : types) {
                 argcTypes.add(MethodType.methodType(rtype));
@@ -456,7 +458,7 @@ public class InvokeGenericTest {
                 if (argc >= maxargc)
                     break;
                 ArrayList<MethodType> prevTypes = argcTypes;
-                argcTypes = new ArrayList<MethodType>();
+                argcTypes = new ArrayList<>();
                 for (MethodType prevType : prevTypes) {
                     for (Class<?> ptype : types) {
                         argcTypes.add(prevType.insertParameterTypes(argc, ptype));
@@ -524,8 +526,8 @@ public class InvokeGenericTest {
         countTest();
         Object[] args = { 1, 2 };
         MethodHandle mh = callable(Object.class, int.class);
-        Object res; List resl; int resi;
-        res = resl = (List) mh.invoke((int)args[0], (Object)args[1]);
+        Object res; List<?> resl; int resi;
+        res = resl = (List<?>) mh.invoke((int)args[0], (Object)args[1]);
         //System.out.println(res);
         assertEquals(Arrays.asList(args), res);
         mh = MethodHandles.identity(int.class);

test/java/lang/invoke/JavaDocExamplesTest.java

@@ -54,6 +54,7 @@ import static org.junit.Assert.*;
 /**
  * @author jrose
  */
+@SuppressWarnings("LocalVariableHidesMemberVariable")
 public class JavaDocExamplesTest {
     /** Wrapper for running the JUnit tests in this module.
      *  Put JUnit on the classpath!
@@ -336,6 +337,7 @@ assertEquals("[123]", (String) longsToString.invokeExact((long)123));
             }}
     }
 
+    @SuppressWarnings("rawtypes")
     @Test public void testAsVarargsCollector() throws Throwable {
         {{
 {} /// JAVADOC

test/java/lang/invoke/MethodHandlesTest.java

@@ -176,7 +176,7 @@ public class MethodHandlesTest {
         }
     }
 
-    static List<Object> calledLog = new ArrayList<Object>();
+    static List<Object> calledLog = new ArrayList<>();
     static Object logEntry(String name, Object... args) {
         return Arrays.asList(name, Arrays.asList(args));
     }
@@ -211,6 +211,7 @@ public class MethodHandlesTest {
         return dst.cast(value);
     }
 
+    @SuppressWarnings("cast")  // primitive cast to (long) is part of the pattern
     static Object castToWrapperOrNull(long value, Class<?> dst) {
         if (dst == int.class || dst == Integer.class)
             return (int)(value);
@@ -284,8 +285,7 @@ public class MethodHandlesTest {
         else
             try {
                 return param.newInstance();
-            } catch (InstantiationException ex) {
-            } catch (IllegalAccessException ex) {
+            } catch (InstantiationException | IllegalAccessException ex) {
             }
         return null;  // random class not Object, String, Integer, etc.
     }
@@ -302,9 +302,11 @@ public class MethodHandlesTest {
         return args;
     }
 
+    @SafeVarargs @SuppressWarnings("varargs")
     static <T, E extends T> T[] array(Class<T[]> atype, E... a) {
         return Arrays.copyOf(a, a.length, atype);
     }
+    @SafeVarargs @SuppressWarnings("varargs")
     static <T> T[] cat(T[] a, T... b) {
         int alen = a.length, blen = b.length;
         if (blen == 0)  return a;
@@ -354,14 +356,14 @@ public class MethodHandlesTest {
                 try {
                     LIST_TO_STRING = PRIVATE.findStatic(PRIVATE.lookupClass(), "listToString",
                                                         MethodType.methodType(String.class, List.class));
-                } catch (Exception ex) { throw new RuntimeException(ex); }
+                } catch (NoSuchMethodException | IllegalAccessException ex) { throw new RuntimeException(ex); }
             list = MethodHandles.filterReturnValue(list, LIST_TO_STRING);
         } else if (rtype.isPrimitive()) {
             if (LIST_TO_INT == null)
                 try {
                     LIST_TO_INT = PRIVATE.findStatic(PRIVATE.lookupClass(), "listToInt",
                                                      MethodType.methodType(int.class, List.class));
-                } catch (Exception ex) { throw new RuntimeException(ex); }
+                } catch (NoSuchMethodException | IllegalAccessException ex) { throw new RuntimeException(ex); }
             list = MethodHandles.filterReturnValue(list, LIST_TO_INT);
             list = MethodHandles.explicitCastArguments(list, listType);
         } else {
@@ -370,8 +372,8 @@ public class MethodHandlesTest {
         return list.asType(listType);
     }
     private static MethodHandle LIST_TO_STRING, LIST_TO_INT;
-    private static String listToString(List x) { return x.toString(); }
-    private static int listToInt(List x) { return x.toString().hashCode(); }
+    private static String listToString(List<?> x) { return x.toString(); }
+    private static int listToInt(List<?> x) { return x.toString().hashCode(); }
 
     static MethodHandle changeArgTypes(MethodHandle target, Class<?> argType) {
         return changeArgTypes(target, 0, 999, argType);
@@ -380,7 +382,7 @@ public class MethodHandlesTest {
             int beg, int end, Class<?> argType) {
         MethodType targetType = target.type();
         end = Math.min(end, targetType.parameterCount());
-        ArrayList<Class<?>> argTypes = new ArrayList<Class<?>>(targetType.parameterList());
+        ArrayList<Class<?>> argTypes = new ArrayList<>(targetType.parameterList());
         Collections.fill(argTypes.subList(beg, end), argType);
         MethodType ttype2 = MethodType.methodType(targetType.returnType(), argTypes);
         return target.asType(ttype2);
@@ -405,6 +407,7 @@ public class MethodHandlesTest {
         final String name;
         public Example() { name = "Example#"+nextArg(); }
         protected Example(String name) { this.name = name; }
+        @SuppressWarnings("LeakingThisInConstructor")
         protected Example(int x) { this(); called("protected <init>", this, x); }
         @Override public String toString() { return name; }
 
@@ -441,6 +444,7 @@ public class MethodHandlesTest {
     static class SubExample extends Example {
         @Override public void  v0()     { called("Sub/v0", this); }
         @Override void         pkg_v0() { called("Sub/pkg_v0", this); }
+        @SuppressWarnings("LeakingThisInConstructor")
         private      SubExample(int x)  { called("<init>", this, x); }
         public SubExample() { super("SubExample#"+nextArg()); }
     }
@@ -912,7 +916,7 @@ public class MethodHandlesTest {
 
         static final Object[][] CASES;
         static {
-            ArrayList<Object[]> cases = new ArrayList<Object[]>();
+            ArrayList<Object[]> cases = new ArrayList<>();
             Object types[][] = {
                 {'L',Object.class}, {'R',String.class},
                 {'I',int.class}, {'J',long.class},
@@ -931,12 +935,12 @@ public class MethodHandlesTest {
                     Field field;
                         try {
                         field = HasFields.class.getDeclaredField(name);
-                    } catch (Exception ex) {
+                    } catch (NoSuchFieldException | SecurityException ex) {
                         throw new InternalError("no field HasFields."+name);
                     }
                     try {
                         value = field.get(fields);
-                    } catch (Exception ex) {
+                    } catch (IllegalArgumentException | IllegalAccessException ex) {
                         throw new InternalError("cannot fetch field HasFields."+name);
                     }
                     if (type == float.class) {
@@ -1257,7 +1261,7 @@ public class MethodHandlesTest {
 
     List<Object> array2list(Object array) {
         int length = Array.getLength(array);
-        ArrayList<Object> model = new ArrayList<Object>(length);
+        ArrayList<Object> model = new ArrayList<>(length);
         for (int i = 0; i < length; i++)
             model.add(Array.get(array, i));
         return model;
@@ -1288,7 +1292,7 @@ public class MethodHandlesTest {
             String name = pfx+"id";
             try {
                 return PRIVATE.findStatic(Callee.class, name, type);
-            } catch (Exception ex) {
+            } catch (NoSuchMethodException | IllegalAccessException ex) {
                 throw new RuntimeException(ex);
             }
         }
@@ -1365,7 +1369,7 @@ public class MethodHandlesTest {
         MethodHandle vac = vac0.asVarargsCollector(Object[].class);
         testConvert(true, vac.asType(MethodType.genericMethodType(0)), null, "vac");
         testConvert(true, vac.asType(MethodType.genericMethodType(0)), null, "vac");
-        for (Class<?> at : new Class[] { Object.class, String.class, Integer.class }) {
+        for (Class<?> at : new Class<?>[] { Object.class, String.class, Integer.class }) {
             testConvert(true, vac.asType(MethodType.genericMethodType(1)), null, "vac", at);
             testConvert(true, vac.asType(MethodType.genericMethodType(2)), null, "vac", at, at);
         }
@@ -1514,7 +1518,7 @@ public class MethodHandlesTest {
     public void testSpreadArguments() throws Throwable {
         if (CAN_SKIP_WORKING)  return;
         startTest("spreadArguments");
-        for (Class<?> argType : new Class[]{Object.class, Integer.class, int.class}) {
+        for (Class<?> argType : new Class<?>[]{Object.class, Integer.class, int.class}) {
             if (verbosity >= 3)
                 System.out.println("spreadArguments "+argType);
             for (int nargs = 0; nargs < 50; nargs++) {
@@ -1538,7 +1542,7 @@ public class MethodHandlesTest {
         Object[] args = randomArgs(target2.type().parameterArray());
         // make sure the target does what we think it does:
         if (pos == 0 && nargs < 5 && !argType.isPrimitive()) {
-            Object[] check = (Object[]) (Object) target.invokeWithArguments(args);
+            Object[] check = (Object[]) target.invokeWithArguments(args);
             assertArrayEquals(args, check);
             switch (nargs) {
                 case 0:
@@ -1555,7 +1559,7 @@ public class MethodHandlesTest {
                     break;
             }
         }
-        List<Class<?>> newParams = new ArrayList<Class<?>>(target2.type().parameterList());
+        List<Class<?>> newParams = new ArrayList<>(target2.type().parameterList());
         {   // modify newParams in place
             List<Class<?>> spreadParams = newParams.subList(pos, nargs);
             spreadParams.clear(); spreadParams.add(arrayType);
@@ -1608,7 +1612,7 @@ public class MethodHandlesTest {
     public void testCollectArguments() throws Throwable {
         if (CAN_SKIP_WORKING)  return;
         startTest("collectArguments");
-        for (Class<?> argType : new Class[]{Object.class, Integer.class, int.class}) {
+        for (Class<?> argType : new Class<?>[]{Object.class, Integer.class, int.class}) {
             if (verbosity >= 3)
                 System.out.println("collectArguments "+argType);
             for (int nargs = 0; nargs < 50; nargs++) {
@@ -1670,12 +1674,13 @@ public class MethodHandlesTest {
         MethodHandle target = varargsArray(nargs + ins);
         Object[] args = randomArgs(target.type().parameterArray());
         List<Object> resList = Arrays.asList(args);
-        List<Object> argsToPass = new ArrayList<Object>(resList);
+        List<Object> argsToPass = new ArrayList<>(resList);
         List<Object> argsToInsert = argsToPass.subList(pos, pos + ins);
         if (verbosity >= 3)
             System.out.println("insert: "+argsToInsert+" into "+target);
+        @SuppressWarnings("cast")  // cast to spread Object... is helpful
         MethodHandle target2 = MethodHandles.insertArguments(target, pos,
-                (Object[]) argsToInsert.toArray());
+                (Object[]/*...*/) argsToInsert.toArray());
         argsToInsert.clear();  // remove from argsToInsert
         Object res2 = target2.invokeWithArguments(argsToPass);
         Object res2List = Arrays.asList((Object[])res2);
@@ -1693,7 +1698,7 @@ public class MethodHandlesTest {
         Class<?> classOfVCList = varargsList(1).invokeWithArguments(0).getClass();
         assertTrue(List.class.isAssignableFrom(classOfVCList));
         for (int nargs = 0; nargs <= 3; nargs++) {
-            for (Class<?> rtype : new Class[] { Object.class,
+            for (Class<?> rtype : new Class<?>[] { Object.class,
                                                 List.class,
                                                 int.class,
                                                 byte.class,
@@ -1790,7 +1795,7 @@ public class MethodHandlesTest {
             System.out.println("fold "+target+" with "+combine);
         MethodHandle target2 = MethodHandles.foldArguments(target, combine);
         // Simulate expected effect of combiner on arglist:
-        List<Object> expected = new ArrayList<Object>(argsToPass);
+        List<Object> expected = new ArrayList<>(argsToPass);
         List<Object> argsToFold = expected.subList(pos, pos + fold);
         if (verbosity >= 3)
             System.out.println("fold: "+argsToFold+" into "+target2);
@@ -1822,9 +1827,9 @@ public class MethodHandlesTest {
         MethodHandle target = varargsArray(nargs);
         Object[] args = randomArgs(target.type().parameterArray());
         MethodHandle target2 = MethodHandles.dropArguments(target, pos,
-                Collections.nCopies(drop, Object.class).toArray(new Class[0]));
+                Collections.nCopies(drop, Object.class).toArray(new Class<?>[0]));
         List<Object> resList = Arrays.asList(args);
-        List<Object> argsToDrop = new ArrayList<Object>(resList);
+        List<Object> argsToDrop = new ArrayList<>(resList);
         for (int i = drop; i > 0; i--) {
             argsToDrop.add(pos, "blort#"+i);
         }
@@ -1840,11 +1845,11 @@ public class MethodHandlesTest {
         if (CAN_SKIP_WORKING)  return;
         startTest("exactInvoker, genericInvoker, varargsInvoker, dynamicInvoker");
         // exactInvoker, genericInvoker, varargsInvoker[0..N], dynamicInvoker
-        Set<MethodType> done = new HashSet<MethodType>();
+        Set<MethodType> done = new HashSet<>();
         for (int i = 0; i <= 6; i++) {
             if (CAN_TEST_LIGHTLY && i > 3)  break;
             MethodType gtype = MethodType.genericMethodType(i);
-            for (Class<?> argType : new Class[]{Object.class, Integer.class, int.class}) {
+            for (Class<?> argType : new Class<?>[]{Object.class, Integer.class, int.class}) {
                 for (int j = -1; j < i; j++) {
                     MethodType type = gtype;
                     if (j < 0)
@@ -1873,7 +1878,7 @@ public class MethodHandlesTest {
         assertTrue(target.isVarargsCollector());
         target = target.asType(type);
         Object[] args = randomArgs(type.parameterArray());
-        List<Object> targetPlusArgs = new ArrayList<Object>(Arrays.asList(args));
+        List<Object> targetPlusArgs = new ArrayList<>(Arrays.asList(args));
         targetPlusArgs.add(0, target);
         int code = (Integer) invokee(args);
         Object log = logEntry("invokee", args);
@@ -1960,7 +1965,7 @@ public class MethodHandlesTest {
                                   .appendParameterTypes(Object[].class)
                                   .insertParameterTypes(0, MethodHandle.class));
             assertEquals(expType, inv.type());
-            List<Object> targetPlusVarArgs = new ArrayList<Object>(targetPlusArgs);
+            List<Object> targetPlusVarArgs = new ArrayList<>(targetPlusArgs);
             List<Object> tailList = targetPlusVarArgs.subList(1+k, 1+nargs);
             Object[] tail = tailList.toArray();
             tailList.clear(); tailList.add(tail);
@@ -2191,7 +2196,7 @@ public class MethodHandlesTest {
         if (throwMode == THROW_NOTHING) {
             assertSame(arg0, returned);
         } else if (throwMode == THROW_CAUGHT) {
-            List<Object> catchArgs = new ArrayList<Object>(Arrays.asList(args));
+            List<Object> catchArgs = new ArrayList<>(Arrays.asList(args));
             // catcher receives an initial subsequence of target arguments:
             catchArgs.subList(nargs - catchDrops, nargs).clear();
             // catcher also receives the exception, prepended:
@@ -2317,12 +2322,13 @@ public class MethodHandlesTest {
                 INT_IDENTITY = PRIVATE.findStatic(
                     Surprise.class, "intIdentity",
                         MethodType.methodType(int.class, int.class));
-            } catch (Exception ex) {
+            } catch (NoSuchMethodException | IllegalAccessException ex) {
                 throw new RuntimeException(ex);
             }
         }
     }
 
+    @SuppressWarnings("ConvertToStringSwitch")
     void testCastFailure(String mode, int okCount) throws Throwable {
         countTest(false);
         if (verbosity > 2)  System.out.println("mode="+mode);
@@ -2419,12 +2425,13 @@ public class MethodHandlesTest {
     public interface Fooable {
         // overloads:
         Object  foo(Object x, String y);
-        List   foo(String x, int y);
+        List<?> foo(String x, int y);
         Object  foo(String x);
     }
     static Object fooForFooable(String x, Object... y) {
         return called("fooForFooable/"+x, y);
     }
+    @SuppressWarnings("serial")  // not really a public API, just a test case
     public static class MyCheckedException extends Exception {
     }
     public interface WillThrow {
@@ -2453,7 +2460,7 @@ public class MethodHandlesTest {
         {
             countTest();
             if (verbosity >= 2)  System.out.println("Appendable");
-            ArrayList<List> appendResults = new ArrayList<List>();
+            ArrayList<List<?>> appendResults = new ArrayList<>();
             MethodHandle append = lookup.bind(appendResults, "add", MethodType.methodType(boolean.class, Object.class));
             append = append.asType(MethodType.methodType(void.class, List.class)); // specialize the type
             MethodHandle asList = lookup.findStatic(Arrays.class, "asList", MethodType.methodType(List.class, Object[].class));
@@ -2475,11 +2482,11 @@ public class MethodHandlesTest {
             formatter.format(fmt, fmtArgs);
             String actual = "";
             if (verbosity >= 3)  System.out.println("appendResults="+appendResults);
-            for (List l : appendResults) {
+            for (List<?> l : appendResults) {
                 Object x = l.get(0);
                 switch (l.size()) {
                 case 1:  actual += x; continue;
-                case 3:  actual += ((String)x).substring((int)l.get(1), (int)l.get(2)); continue;
+                case 3:  actual += ((String)x).substring((int)(Object)l.get(1), (int)(Object)l.get(2)); continue;
                 }
                 actual += l;
             }
@@ -2551,7 +2558,7 @@ public class MethodHandlesTest {
             }
         }
         // Test error checking on bad interfaces:
-        for (Class<?> nonSMI : new Class[] { Object.class,
+        for (Class<?> nonSMI : new Class<?>[] { Object.class,
                                              String.class,
                                              CharSequence.class,
                                              java.io.Serializable.class,
@@ -2579,7 +2586,7 @@ public class MethodHandlesTest {
             }
         }
         // Test error checking on interfaces with the wrong method type:
-        for (Class<?> intfc : new Class[] { Runnable.class /*arity 0*/,
+        for (Class<?> intfc : new Class<?>[] { Runnable.class /*arity 0*/,
                                             Fooable.class /*arity 1 & 2*/ }) {
             int badArity = 1;  // known to be incompatible
             if (verbosity > 2)  System.out.println(intfc.getName());
@@ -2657,7 +2664,7 @@ class ValueConversions {
                                   Object a8, Object a9)
                 { return makeArray(a0, a1, a2, a3, a4, a5, a6, a7, a8, a9); }
     static MethodHandle[] makeArrays() {
-        ArrayList<MethodHandle> arrays = new ArrayList<MethodHandle>();
+        ArrayList<MethodHandle> arrays = new ArrayList<>();
         MethodHandles.Lookup lookup = IMPL_LOOKUP;
         for (;;) {
             int nargs = arrays.size();
@@ -2746,7 +2753,7 @@ class ValueConversions {
                                      Object a8, Object a9)
                 { return makeList(a0, a1, a2, a3, a4, a5, a6, a7, a8, a9); }
     static MethodHandle[] makeLists() {
-        ArrayList<MethodHandle> lists = new ArrayList<MethodHandle>();
+        ArrayList<MethodHandle> lists = new ArrayList<>();
         MethodHandles.Lookup lookup = IMPL_LOOKUP;
         for (;;) {
             int nargs = lists.size();
@@ -2769,7 +2776,7 @@ class ValueConversions {
     static {
         try {
             AS_LIST = IMPL_LOOKUP.findStatic(Arrays.class, "asList", MethodType.methodType(List.class, Object[].class));
-        } catch (Exception ex) { throw new RuntimeException(ex); }
+        } catch (NoSuchMethodException | IllegalAccessException ex) { throw new RuntimeException(ex); }
     }
 
     /** Return a method handle that takes the indicated number of Object

test/java/lang/invoke/MethodTypeTest.java

@@ -29,6 +29,7 @@
 
 package test.java.lang.invoke;
 
+import java.io.IOException;
 import java.lang.invoke.MethodType;
 import java.lang.reflect.Method;
 
@@ -378,7 +379,7 @@ public class MethodTypeTest {
     public void testHashCode() {
         System.out.println("hashCode");
         MethodType instance = mt_viS;
-        ArrayList<Class<?>> types = new ArrayList<Class<?>>();
+        ArrayList<Class<?>> types = new ArrayList<>();
         types.add(instance.returnType());
         types.addAll(instance.parameterList());
         int expResult = types.hashCode();
@@ -556,7 +557,7 @@ public class MethodTypeTest {
             Object decode;
             try {
                 decode = readSerial(wire);
-            } catch (Exception ex) {
+            } catch (IOException | ClassNotFoundException ex) {
                 decode = ex;  // oops!
             }
             assertEquals(mt, decode);

test/java/lang/invoke/PermuteArgsTest.java

@@ -45,7 +45,7 @@ import static java.lang.invoke.MethodHandles.*;
 import static java.lang.invoke.MethodType.*;
 
 public class PermuteArgsTest {
-    private static final Class CLASS = PermuteArgsTest.class;
+    private static final Class<?> CLASS = PermuteArgsTest.class;
     private static final int MAX_ARITY = Integer.getInteger(CLASS.getSimpleName()+".MAX_ARITY", 8);
     private static final boolean DRY_RUN = Boolean.getBoolean(CLASS.getSimpleName()+".DRY_RUN");
     private static final boolean VERBOSE = Boolean.getBoolean(CLASS.getSimpleName()+".VERBOSE") || DRY_RUN;
@@ -99,12 +99,12 @@ public class PermuteArgsTest {
         return Arrays.asList(w, x, y, z);
     }
     static Object listI_etc(int... va) {
-        ArrayList<Object> res = new ArrayList<Object>();
+        ArrayList<Object> res = new ArrayList<>();
         for (int x : va)  res.add(x);
         return res;
     }
     static Object listIJL_etc(int x, long y, Object z, Object... va) {
-        ArrayList<Object> res = new ArrayList<Object>();
+        ArrayList<Object> res = new ArrayList<>();
         res.addAll(Arrays.asList(x, y, z));
         res.addAll(Arrays.asList(va));
         return res;
@@ -168,7 +168,7 @@ public class PermuteArgsTest {
                     mh1 = adjustArity(mh, arity);
                 } catch (IllegalArgumentException ex) {
                     System.out.println("*** mh = "+name+" : "+mh+"; arity = "+arity+" => "+ex);
-                    ex.printStackTrace();
+                    ex.printStackTrace(System.out);
                     break;  // cannot get this arity for this type
                 }
                 test("("+arity+")"+name, mh1);
@@ -213,7 +213,7 @@ public class PermuteArgsTest {
     }
 
     static void testPermutations(MethodHandle mh) throws Throwable {
-        HashSet<String> done = new HashSet<String>();
+        HashSet<String> done = new HashSet<>();
         MethodType mt = mh.type();
         int[] perm = nullPerm(mt.parameterCount());
         final int MARGIN = (perm.length <= 10 ? 2 : 0);
@@ -326,8 +326,8 @@ public class PermuteArgsTest {
             Class<?> pt = ptypes[i];
             Object arg;
             if (pt == Void.class)       arg = null;
-            else if (pt == int.class)   arg = (int)  i + 101;
-            else if (pt == long.class)  arg = (long) i + 10_000_000_001L;
+            else if (pt == int.class)   arg = i + 101;
+            else if (pt == long.class)  arg = i + 10_000_000_001L;
             else                        arg = "#" + (i + 1);
             args[i] = arg;
         }

test/java/lang/invoke/RicochetTest.java

@@ -40,7 +40,6 @@ import org.junit.*;
 import static java.lang.invoke.MethodType.*;
 import static java.lang.invoke.MethodHandles.*;
 import static org.junit.Assert.*;
-import static org.junit.Assume.*;
 
 
 /**
@@ -48,7 +47,7 @@ import static org.junit.Assume.*;
  * @author jrose
  */
 public class RicochetTest {
-    private static final Class CLASS = RicochetTest.class;
+    private static final Class<?> CLASS = RicochetTest.class;
     private static final int MAX_ARITY = Integer.getInteger(CLASS.getSimpleName()+".MAX_ARITY", 40);
 
     public static void main(String... av) throws Throwable {
@@ -148,7 +147,7 @@ public class RicochetTest {
         for (int nargs = 0; nargs <= MAX; nargs++) {
             if (nargs > 30 && nargs < MAX-20)  nargs += 10;
             int[] args = new int[nargs];
-            for (int j = 0; j < args.length; j++)  args[j] = (int)(j + 11);
+            for (int j = 0; j < args.length; j++)  args[j] = j + 11;
             //System.out.println("testIntSpreads "+Arrays.toString(args));
             int[] args1 = (int[]) id.invokeExact(args);
             assertArrayEquals(args, args1);
@@ -388,6 +387,7 @@ public class RicochetTest {
         java.util.Random random;
         final MethodHandle[] fns;
         int depth;
+        @SuppressWarnings("LeakingThisInConstructor")
         RFCB(int seed) throws Throwable {
             this.random = new java.util.Random(seed);
             this.fns = new MethodHandle[Math.max(29, (1 << MAX_DEPTH-2)/3)];
@@ -408,7 +408,7 @@ public class RicochetTest {
                 case 1:
                     Throwable ex = new RuntimeException();
                     ex.fillInStackTrace();
-                    if (VERBOSITY >= 2) ex.printStackTrace();
+                    if (VERBOSITY >= 2) ex.printStackTrace(System.out);
                     x = "ST; " + x;
                     break;
                 case 2:
@@ -467,7 +467,7 @@ public class RicochetTest {
             return mh.invokeWithArguments(args);
         } catch (Throwable ex) {
             System.out.println("threw: "+mh+Arrays.asList(args));
-            ex.printStackTrace();
+            ex.printStackTrace(System.out);
             return ex;
         }
     }
@@ -515,8 +515,8 @@ public class RicochetTest {
     private static long opJ(long x) { return (long) opI((int)x); }
     private static Object opL2(Object x, Object y) { return (Object) opI2((int)x, (int)y); }
     private static Object opL(Object x) { return (Object) opI((int)x); }
-    private static int opL2_I(Object x, Object y) { return (int) opI2((int)x, (int)y); }
-    private static int opL_I(Object x) { return (int) opI((int)x); }
+    private static int opL2_I(Object x, Object y) { return opI2((int)x, (int)y); }
+    private static int opL_I(Object x) { return opI((int)x); }
     private static long opL_J(Object x) { return (long) opI((int)x); }
     private static final MethodHandle opI, opI2, opI3, opI4, opI_L, opJ, opJ2, opJ3, opL2, opL, opL2_I, opL_I, opL_J;
     static {
@@ -570,8 +570,8 @@ public class RicochetTest {
             INT_LISTERS[i] = lister;
             LONG_LISTERS[i] = llister;
             if (i == 0)  break;
-            lister  = insertArguments(lister,  i-1, (int)0);
-            llister = insertArguments(llister, i-1, (long)0);
+            lister  = insertArguments(lister,  i-1, 0);
+            llister = insertArguments(llister, i-1, 0L);
         }
     }
 

test/java/lang/invoke/ThrowExceptionsTest.java

@@ -40,7 +40,7 @@ import static java.lang.invoke.MethodHandles.*;
 import static java.lang.invoke.MethodType.*;
 
 public class ThrowExceptionsTest {
-    private static final Class CLASS = ThrowExceptionsTest.class;
+    private static final Class<?> CLASS = ThrowExceptionsTest.class;
     private static final Lookup LOOKUP = lookup();
 
     public static void main(String argv[]) throws Throwable {
@@ -132,9 +132,9 @@ public class ThrowExceptionsTest {
                 int tc = testCases;
                 try {
                     m.invoke(this);
-                } catch (Throwable ex) {
+                } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException ex) {
                     System.out.println("*** "+ex);
-                    ex.printStackTrace();
+                    ex.printStackTrace(System.out);
                 }
                 if (testCases == tc)  testCases++;
             }

test/sun/invoke/util/ValueConversionsTest.java

@@ -27,11 +27,9 @@ import sun.invoke.util.ValueConversions;
 import sun.invoke.util.Wrapper;
 import java.lang.invoke.MethodType;
 import java.lang.invoke.MethodHandle;
-import java.lang.invoke.MethodHandles;
 import java.io.Serializable;
 import java.util.Arrays;
 import java.util.Collections;
-import org.junit.Ignore;
 import org.junit.Test;
 import static org.junit.Assert.*;
 
@@ -52,7 +50,7 @@ import static org.junit.Assert.*;
  * @author jrose
  */
 public class ValueConversionsTest {
-    private static final Class CLASS = ValueConversionsTest.class;
+    private static final Class<?> CLASS = ValueConversionsTest.class;
     private static final int MAX_ARITY = Integer.getInteger(CLASS.getSimpleName()+".MAX_ARITY", 40);
     private static final int START_ARITY = Integer.getInteger(CLASS.getSimpleName()+".START_ARITY", 0);
     private static final boolean EXHAUSTIVE = Boolean.getBoolean(CLASS.getSimpleName()+".EXHAUSTIVE");
@@ -165,7 +163,7 @@ public class ValueConversionsTest {
                 Object expResult = box;
                 Object result = null;
                 switch (w) {
-                    case INT:     result = boxer.invokeExact((int)n); break;
+                    case INT:     result = boxer.invokeExact(/*int*/n); break;
                     case LONG:    result = boxer.invokeExact((long)n); break;
                     case FLOAT:   result = boxer.invokeExact((float)n); break;
                     case DOUBLE:  result = boxer.invokeExact((double)n); break;
@@ -361,6 +359,7 @@ public class ValueConversionsTest {
             assert(stype == MethodType.methodType(arrayType, arrayType));
             if (nargs <= 5) {
                 // invoke target as a spreader also:
+                @SuppressWarnings("cast")
                 Object res2 = spreader.invokeWithArguments((Object)res);
                 String res2String = toArrayString(res2);
                 assertEquals(Arrays.toString(args), res2String);