6888802: sun.misc.BootClassLoaderHook.getBootstrapPaths stack overflow

Fixed sun.misc.BootClassLoaderHook.getBootstrapPaths calls hook.getAdditionalBootstrapPaths

Reviewed-by: alanb, tbell

jdk/src/share/classes/sun/misc/BootClassLoaderHook.java

@@ -102,7 +102,7 @@ public abstract class BootClassLoaderHook {
     public static File[] getBootstrapPaths() {
         BootClassLoaderHook hook = getHook();
         if (hook != null) {
-            return hook.getBootstrapPaths();
+            return hook.getAdditionalBootstrapPaths();
         } else {
             return EMPTY_FILE_ARRAY;
         }

jdk/test/sun/misc/BootClassLoaderHook/TestHook.java

@@ -0,0 +1,112 @@
+/*
+ * Copyright 2009 Sun Microsystems, Inc.  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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+import java.io.File;
+import java.util.TreeSet;
+import java.util.Set;
+import sun.misc.BootClassLoaderHook;
+
+/* @test
+ * @bug     6888802
+ * @summary Sanity test of BootClassLoaderHook interface
+ *
+ * @build TestHook
+ * @run main TestHook
+ */
+
+public class TestHook extends BootClassLoaderHook {
+
+    private static final TestHook hook = new TestHook();
+    private static Set<String> names = new TreeSet<String>();
+    private static final String LOGRECORD_CLASS =
+        "java.util.logging.LogRecord";
+    private static final String NONEXIST_RESOURCE =
+        "non.exist.resource";
+    private static final String LIBHELLO = "hello";
+
+    public static void main(String[] args) throws Exception {
+        BootClassLoaderHook.setHook(hook);
+        if (BootClassLoaderHook.getHook() == null) {
+           throw new RuntimeException("Null boot classloader hook ");
+        }
+
+        testHook();
+
+        if (!names.contains(LOGRECORD_CLASS)) {
+           throw new RuntimeException("loadBootstrapClass for " + LOGRECORD_CLASS + " not called");
+        }
+
+        if (!names.contains(NONEXIST_RESOURCE)) {
+           throw new RuntimeException("getBootstrapResource for " + NONEXIST_RESOURCE + " not called");
+        }
+        if (!names.contains(LIBHELLO)) {
+           throw new RuntimeException("loadLibrary for " + LIBHELLO + " not called");
+        }
+
+        Set<String> copy = new TreeSet<String>();
+        copy.addAll(names);
+        for (String s : copy) {
+            System.out.println("  Loaded " + s);
+        }
+
+        if (BootClassLoaderHook.getBootstrapPaths().length > 0) {
+           throw new RuntimeException("Unexpected returned value from getBootstrapPaths()");
+        }
+    }
+
+    private static void testHook() throws Exception {
+        Class.forName(LOGRECORD_CLASS);
+        ClassLoader.getSystemResource(NONEXIST_RESOURCE);
+        try {
+          System.loadLibrary(LIBHELLO);
+        } catch (UnsatisfiedLinkError e) {
+        }
+    }
+
+    public String loadBootstrapClass(String className) {
+        names.add(className);
+        return null;
+    }
+
+    public String getBootstrapResource(String resourceName) {
+        names.add(resourceName);
+        return null;
+    }
+
+    public boolean loadLibrary(String libname) {
+        names.add(libname);
+        return false;
+    }
+
+    public File[] getAdditionalBootstrapPaths() {
+        return new File[0];
+    }
+
+    public boolean isCurrentThreadPrefetching() {
+        return false;
+    }
+
+    public boolean prefetchFile(String name) {
+        return false;
+    }
+}