diff --git a/test/compiler/6894807/IsInstanceTest.java b/test/compiler/6894807/IsInstanceTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..ddc3fed365a3379bf02042d53c5a52fd3785fc21
--- /dev/null
+++ b/test/compiler/6894807/IsInstanceTest.java
@@ -0,0 +1,44 @@
+/*
+ * @test
+ * @bug 6894807
+ * @summary No ClassCastException for HashAttributeSet constructors if run with -Xcomp
+ * @compile IsInstanceTest.java
+ * @run shell Test6894807.sh
+*/
+
+public class IsInstanceTest {
+
+    public static void main(String[] args) {
+        BaseInterface baseInterfaceImpl = new BaseInterfaceImpl();
+        for (int i = 0; i < 100000; i++) {
+            if (isInstanceOf(baseInterfaceImpl, ExtendedInterface.class)) {
+                System.out.println("Failed at index:" + i);
+                System.out.println("Arch: "+System.getProperty("os.arch", "")+
+                                   " OS: "+System.getProperty("os.name", "")+
+                                   " OSV: "+System.getProperty("os.version", "")+
+                                   " Cores: "+Runtime.getRuntime().availableProcessors()+
+                                   " JVM: "+System.getProperty("java.version", "")+" "+System.getProperty("sun.arch.data.model", ""));
+                break;
+            }
+        }
+        System.out.println("Done!");
+    }
+
+    public static boolean isInstanceOf(BaseInterface baseInterfaceImpl, Class... baseInterfaceClasses) {
+        for (Class baseInterfaceClass : baseInterfaceClasses) {
+            if (baseInterfaceClass.isInstance(baseInterfaceImpl)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private interface BaseInterface {
+    }
+
+    private interface ExtendedInterface extends BaseInterface {
+    }
+
+    private static class BaseInterfaceImpl implements BaseInterface {
+    }
+}
diff --git a/test/compiler/6894807/Test6894807.sh b/test/compiler/6894807/Test6894807.sh
new file mode 100644
index 0000000000000000000000000000000000000000..da435cc380fba09e918a98745db81917ba45cacf
--- /dev/null
+++ b/test/compiler/6894807/Test6894807.sh
@@ -0,0 +1,68 @@
+#!/bin/sh
+
+if [ "${TESTSRC}" = "" ]
+then TESTSRC=.
+fi
+
+if [ "${TESTJAVA}" = "" ]
+then
+  PARENT=`dirname \`which java\``
+  TESTJAVA=`dirname ${PARENT}`
+  echo "TESTJAVA not set, selecting " ${TESTJAVA}
+  echo "If this is incorrect, try setting the variable manually."
+fi
+
+if [ "${TESTCLASSES}" = "" ]
+then
+  echo "TESTCLASSES not set.  Test cannot execute.  Failed."
+  exit 1
+fi
+
+BIT_FLAG=""
+
+# set platform-dependent variables
+OS=`uname -s`
+case "$OS" in
+  SunOS | Linux )
+    NULL=/dev/null
+    PS=":"
+    FS="/"
+    ## for solaris, linux it's HOME
+    FILE_LOCATION=$HOME
+    if [ -f ${FILE_LOCATION}${FS}JDK64BIT -a ${OS} = "SunOS" ]
+    then
+        BIT_FLAG=`cat ${FILE_LOCATION}${FS}JDK64BIT | grep -v '^#'`
+    fi
+    ;;
+  Windows_* )
+    NULL=NUL
+    PS=";"
+    FS="\\"
+    ;;
+  * )
+    echo "Unrecognized system!"
+    exit 1;
+    ;;
+esac
+
+JEMMYPATH=${CPAPPEND}
+CLASSPATH=.${PS}${TESTCLASSES}${PS}${JEMMYPATH} ; export CLASSPATH
+
+THIS_DIR=`pwd`
+
+${TESTJAVA}${FS}bin${FS}java ${BIT_FLAG} -version
+
+${TESTJAVA}${FS}bin${FS}java ${BIT_FLAG} -server IsInstanceTest > test.out 2>&1
+
+cat test.out
+
+grep "Failed at index" test.out
+
+if [ $? = 0 ]
+then
+    echo "Test Failed"
+    exit 1
+else
+    echo "Test Passed"
+    exit 0
+fi
diff --git a/test/runtime/6626217/IFace.java b/test/runtime/6626217/IFace.java
new file mode 100644
index 0000000000000000000000000000000000000000..1c2e86f78bd233289bdf3c2a930352da65e2e145
--- /dev/null
+++ b/test/runtime/6626217/IFace.java
@@ -0,0 +1,6 @@
+// A simple interface, to allow an unknown foreign call from a class
+// loaded with LOADER1 to a class loaded with LOADER2.
+public interface IFace {
+  public many_loader[] gen();
+}
+
diff --git a/test/runtime/6626217/Loader2.java b/test/runtime/6626217/Loader2.java
new file mode 100644
index 0000000000000000000000000000000000000000..ea9e8ec1a975efaf851b2e9e93d5aef641d21a30
--- /dev/null
+++ b/test/runtime/6626217/Loader2.java
@@ -0,0 +1,52 @@
+import java.io.ByteArrayInputStream;
+import java.io.FileInputStream;
+public class Loader2 extends ClassLoader {
+  int _recur;
+  public void print( String msg ) {
+    for( int i=0; i<_recur; i++ )
+      System.out.print("  ");
+    System.out.println(">>Loader2>> "+msg);
+  }
+
+  protected Class findClass2(String name) throws ClassNotFoundException {
+    print("Fetching the implementation of "+name);
+    int old = _recur;
+    try {
+      FileInputStream fi = new FileInputStream(name+".impl2");
+      byte result[] = new byte[fi.available()];
+      fi.read(result);
+
+      print("DefineClass1 on "+name);
+      _recur++;
+      Class clazz = defineClass(name, result, 0, result.length);
+      _recur = old;
+      print("Returning newly loaded class.");
+      return clazz;
+    } catch (Exception e) {
+      _recur = old;
+      print("Not found on disk.");
+      // If we caught an exception, either the class was not found or
+      // it was unreadable by our process.
+      return null;
+      //throw new ClassNotFoundException(e.toString());
+    }
+  }
+
+  protected synchronized Class loadClass(String name, boolean resolve) throws ClassNotFoundException  {
+    // Attempt a disk load first
+    Class c = findClass2(name);
+    if( c == null ) {
+      // check if the class has already been loaded
+      print("Checking for prior loaded class "+name);
+      c = findLoadedClass(name);
+      print("Letting super-loader load "+name);
+      int old = _recur;
+      _recur++;
+      c = super.loadClass(name, false);
+      _recur=old;
+    }
+    if (resolve) { print("Resolving class "+name); resolveClass(c); }
+    print("Returning clazz "+c.getClassLoader()+":"+name);
+    return c;
+  }
+}
diff --git a/test/runtime/6626217/Test6626217.sh b/test/runtime/6626217/Test6626217.sh
new file mode 100644
index 0000000000000000000000000000000000000000..6bc57a7be5057e65afd7255de4aa5207658d4fb8
--- /dev/null
+++ b/test/runtime/6626217/Test6626217.sh
@@ -0,0 +1,101 @@
+#   
+# Copyright 2009 Sun Microsystems, Inc. All rights reserved.
+# SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
+#
+
+#
+# @test @(#)Test6626217.sh
+# @bug 6626217
+# @summary Loader-constraint table allows arrays instead of only the base-classes
+# @run shell Test6626217.sh
+#
+
+if [ "${TESTSRC}" = "" ]
+  then TESTSRC=.
+fi
+
+if [ "${TESTJAVA}" = "" ]
+then
+  PARENT=`dirname \`which java\``
+  TESTJAVA=`dirname ${PARENT}`
+  echo "TESTJAVA not set, selecting " ${TESTJAVA}
+  echo "If this is incorrect, try setting the variable manually."
+fi
+
+if [ "${TESTCLASSES}" = "" ]
+then
+  echo "TESTCLASSES not set.  Test cannot execute.  Failed."
+  exit 1
+fi
+
+BIT_FLAG=""
+
+# set platform-dependent variables
+OS=`uname -s`
+case "$OS" in
+  SunOS | Linux )
+    NULL=/dev/null
+    PS=":"
+    FS="/"
+    RM=/bin/rm
+    CP=/bin/cp
+    MV=/bin/mv
+    ## for solaris, linux it's HOME
+    FILE_LOCATION=$HOME
+    if [ -f ${FILE_LOCATION}${FS}JDK64BIT -a ${OS} = "SunOS" ]
+    then
+        BIT_FLAG=`cat ${FILE_LOCATION}${FS}JDK64BIT`
+    fi
+    ;;
+  Windows_* )
+    NULL=NUL
+    PS=";"
+    FS="\\"
+    RM=rm
+    CP=cp
+    MV=mv
+    ;;
+  * )
+    echo "Unrecognized system!"
+    exit 1;
+    ;;
+esac
+
+JEMMYPATH=${CPAPPEND}
+CLASSPATH=.${PS}${TESTCLASSES}${PS}${JEMMYPATH} ; export CLASSPATH
+
+THIS_DIR=`pwd`
+
+JAVA=${TESTJAVA}${FS}bin${FS}java
+JAVAC=${TESTJAVA}${FS}bin${FS}javac
+
+${JAVA} ${BIT_FLAG} -version
+
+# Current directory is scratch directory, copy all the test source there
+# (for the subsequent moves to work).
+${CP} ${TESTSRC}${FS}*  ${THIS_DIR}
+
+# A Clean Compile: this line will probably fail within jtreg as have a clean dir:
+${RM} -f *.class *.impl many_loader.java
+
+# Compile all the usual suspects, including the default 'many_loader'
+${CP} many_loader1.java.foo many_loader.java
+${JAVAC} -source 1.4 -target 1.4 -Xlint *.java
+
+# Rename the class files, so the custom loader (and not the system loader) will find it
+${MV} from_loader2.class from_loader2.impl2
+
+# Compile the next version of 'many_loader'
+${MV} many_loader.class many_loader.impl1
+${CP} many_loader2.java.foo many_loader.java
+${JAVAC} -source 1.4 -target 1.4 -Xlint many_loader.java
+
+# Rename the class file, so the custom loader (and not the system loader) will find it
+${MV} many_loader.class many_loader.impl2
+${MV} many_loader.impl1 many_loader.class
+${RM} many_loader.java
+
+${JAVA} ${BIT_FLAG} -Xverify -Xint -cp . bug_21227 >test.out 2>&1
+grep "violates loader constraints" test.out
+exit $?
+
diff --git a/test/runtime/6626217/You_Have_Been_P0wned.java b/test/runtime/6626217/You_Have_Been_P0wned.java
new file mode 100644
index 0000000000000000000000000000000000000000..2bebbe0590c05a7e3b2fc38ad0b88896a91e1a00
--- /dev/null
+++ b/test/runtime/6626217/You_Have_Been_P0wned.java
@@ -0,0 +1,11 @@
+
+// I can cast any old thing I want to this type object:
+public class You_Have_Been_P0wned {
+  // Make a bunch of int-fields so I can peek & poke it
+  int _a;
+  int _b;
+  int _c;
+  int _d;
+
+}
+
diff --git a/test/runtime/6626217/bug_21227.java b/test/runtime/6626217/bug_21227.java
new file mode 100644
index 0000000000000000000000000000000000000000..18d30c41fb0b862baa8bd2ee0bd690c05653de97
--- /dev/null
+++ b/test/runtime/6626217/bug_21227.java
@@ -0,0 +1,61 @@
+
+import java.lang.reflect.*;
+import java.security.*;
+
+abstract public class bug_21227 {
+
+  // Jam anything you want in here, it will be cast to a You_Have_Been_P0wned
+  public static Object _p0wnee;
+
+  public static void main(String argv[]) throws ClassNotFoundException, InstantiationException, IllegalAccessException {
+    System.out.println("Warmup");
+
+    // Make a Class 'many_loader' under the default loader
+    bug_21227 bug = new many_loader();
+
+    // Some classes under a new Loader, LOADER2, including another version of 'many_loader'
+    ClassLoader LOADER2 = new Loader2();
+    Class clazz2 = LOADER2.loadClass("from_loader2");
+    IFace iface = (IFace)clazz2.newInstance();
+
+    // Set the victim, a String of length 6
+    String s = "victim";
+    _p0wnee = s;
+
+    // Go cast '_p0wnee' to type You_Have_Been_P0wned
+    many_loader[] x2 = bug.make(iface);
+
+    many_loader b = x2[0];
+
+    // Make it clear that the runtime type many_loader (what we get from the
+    // array X2) varies from the static type of many_loader.
+    Class cl1 = b.getClass();
+    ClassLoader ld1 = cl1.getClassLoader();
+    Class cl2 = many_loader.class;
+    ClassLoader ld2 = cl2.getClassLoader();
+    System.out.println("bug.make()  "+ld1+":"+cl1);
+    System.out.println("many_loader "+ld2+":"+cl2);
+
+    // Read the victims guts out
+    You_Have_Been_P0wned q = b._p0wnee;
+    System.out.println("q._a = 0x"+Integer.toHexString(q._a));
+    System.out.println("q._b = 0x"+Integer.toHexString(q._b));
+    System.out.println("q._c = 0x"+Integer.toHexString(q._c));
+    System.out.println("q._d = 0x"+Integer.toHexString(q._d));
+
+    System.out.println("I will now crash the VM:");
+    // On 32-bit HotSpot Java6 this sets the victim String length shorter, then crashes the VM
+    //q._c = 3;
+    q._a = -1;
+
+    System.out.println(s);
+
+  }
+
+  // I need to compile (hence call in a loop) a function which returns a value
+  // loaded from classloader other than the system one.  The point of this
+  // call is to give me an abstract 'hook' into a function loaded with a
+  // foreign loader.
+  public abstract many_loader[] make( IFace iface ); // abstract factory
+}
+
diff --git a/test/runtime/6626217/from_loader2.java b/test/runtime/6626217/from_loader2.java
new file mode 100644
index 0000000000000000000000000000000000000000..6421f2a3c65d0a486a68483871ff0dfae5bd2dd6
--- /dev/null
+++ b/test/runtime/6626217/from_loader2.java
@@ -0,0 +1,9 @@
+// A simple class to extend an abstract class and get loaded with different
+// loaders.  This class is loaded via LOADER2.
+public class from_loader2 implements IFace {
+  public many_loader[] gen() {
+    many_loader[] x = new many_loader[1];
+    x[0] = new many_loader();
+    return x;
+  }
+}
diff --git a/test/runtime/6626217/many_loader1.java.foo b/test/runtime/6626217/many_loader1.java.foo
new file mode 100644
index 0000000000000000000000000000000000000000..b5295a370c05ef36a7ee09abf8e17e4c07b961f1
--- /dev/null
+++ b/test/runtime/6626217/many_loader1.java.foo
@@ -0,0 +1,23 @@
+// A simple class to extend an abstract class and get loaded with different
+// loaders.  This class is loaded via LOADER1.  A similar named class will
+// be loaded via LOADER2.
+public class many_loader extends bug_21227 {
+  public You_Have_Been_P0wned _p0wnee;
+
+  // I need to compile (hence call in a loop) a function which returns a value
+  // loaded from classloader other than the system one.  The point of this
+  // call is to give me an abstract 'hook' into a function loaded with a
+  // foreign loader.
+
+  // The original 'make(boolean)' returns a bug_21227.  The VM will inject a
+  // synthetic method to up-cast the returned 'from_loader1' into a
+  // 'bug_21227'.
+  public many_loader[] make( IFace iface ) { 
+    // This function needs to return a value known to be loaded from LOADER2.
+    // Since I need to use a yet different loader, I need to make an unknown
+    // foreign call.  In this case I'll be using an interface to make the
+    // unknown call, with but a single implementor so the compiler can do the
+    // upcast statically.
+    return iface==null ? null : iface.gen(); 
+  }
+}
diff --git a/test/runtime/6626217/many_loader2.java.foo b/test/runtime/6626217/many_loader2.java.foo
new file mode 100644
index 0000000000000000000000000000000000000000..1b72132a2a8506c0faeefdf4ca5d147fb4c9ec52
--- /dev/null
+++ b/test/runtime/6626217/many_loader2.java.foo
@@ -0,0 +1,19 @@
+// A simple class to extend an abstract class and get loaded with different
+// loaders.  This class is loaded via LOADER2.  A similar named class will
+// be loaded via LOADER1.
+public class many_loader extends bug_21227 {
+  final Object _ref_to_be_p0wned;
+
+  many_loader() {
+    _ref_to_be_p0wned = bug_21227._p0wnee;
+    System.out.println("Gonna hack this thing: " + _ref_to_be_p0wned.toString() );
+  }
+
+  // I need to compile (hence call in a loop) a function which returns a value
+  // loaded from classloader other than the system one.  The point of this
+  // call is to give me an abstract 'hook' into a function loaded with a
+  // foreign loader.
+  public many_loader[] make( IFace iface ) { 
+    throw new Error("do not call me");
+  }
+}