8022161: javac Null Pointer Exception in Enter.visitTopLevel

Reviewed-by: jjg, vromero, jlahoda

src/share/classes/com/sun/tools/javac/comp/Enter.java

@@ -291,7 +291,7 @@ public class Enter extends JCTree.Visitor {
             if (tree.packageAnnotations.nonEmpty() || pkginfoOpt == PkgInfo.ALWAYS) {
                 if (isPkgInfo) {
                     addEnv = true;
-                } else {
+                } else if (tree.packageAnnotations.nonEmpty()){
                     log.error(tree.packageAnnotations.head.pos(),
                               "pkg.annotations.sb.in.package-info.java");
                 }

test/tools/javac/TestPkgInfo.java

 /*
- * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -23,8 +23,10 @@
 
 /*
  * @test
- * @bug 6960424
- * @summary new option -Xpkginfo for better control of when package-info.class is generated
+ * @bug 6960424 8022161
+ * @summary new option -Xpkginfo for better control of when package-info.class
+ *          is generated, also ensures no failures if package-info.java is
+ *          not available.
  */
 
 import java.io.*;
@@ -43,8 +45,11 @@ public class TestPkgInfo {
     public static void main(String... args) throws Exception {
         new TestPkgInfo().run(args);
     }
-
     public void run(String... args) throws Exception {
+        testPositive();
+        testNoExceptions();
+    }
+    public void testPositive(String... args) throws Exception {
         boolean[] booleanValues = { false, true };
         for (OptKind ok: OptKind.values()) {
             for (boolean sr: booleanValues) {
@@ -65,6 +70,32 @@ public class TestPkgInfo {
             throw new Exception(errors + " errors occurred");
     }
 
+    /** this should throw no exceptions **/
+    void testNoExceptions() throws Exception {
+        count++;
+        System.err.println("Test " + count + ": ALWAYS nofile");
+
+        StringBuilder sb = new StringBuilder();
+        sb.append("package test; class Hello{}");
+
+        // test specific tmp directory
+        File tmpDir = new File("tmp.test" + count);
+        File classesDir = new File(tmpDir, "classes");
+        classesDir.mkdirs();
+        File javafile = new File(new File(tmpDir, "src"), "Hello.java");
+        writeFile(javafile, sb.toString());
+        // build up list of options and files to be compiled
+        List<String> opts = new ArrayList<>();
+        List<File> files = new ArrayList<>();
+
+        opts.add("-d");
+        opts.add(classesDir.getPath());
+        opts.add("-Xpkginfo:always");
+        files.add(javafile);
+
+        compile(opts, files);
+    }
+
     void test(OptKind ok, boolean sr, boolean cr, boolean rr) throws Exception {
         count++;
         System.err.println("Test " + count + ": ok:" + ok + " sr:" + sr + " cr:" + cr + " rr:" + rr);
@@ -91,15 +122,15 @@ public class TestPkgInfo {
         writeFile(pkginfo_java, sb.toString());
 
         // build up list of options and files to be compiled
-        List<String> opts = new ArrayList<String>();
-        List<File> files = new ArrayList<File>();
+        List<String> opts = new ArrayList<>();
+        List<File> files = new ArrayList<>();
 
         opts.add("-d");
         opts.add(classesDir.getPath());
         if (ok.opt != null)
             opts.add(ok.opt);
         //opts.add("-verbose");
-        files.add(pkginfo_java);
+            files.add(pkginfo_java);
 
         compile(opts, files);
 
@@ -134,7 +165,7 @@ public class TestPkgInfo {
     /** Compile files with options provided. */
     void compile(List<String> opts, List<File> files) throws Exception {
         System.err.println("javac: " + opts + " " + files);
-        List<String> args = new ArrayList<String>();
+        List<String> args = new ArrayList<>();
         args.addAll(opts);
         for (File f: files)
             args.add(f.getPath());