6862295: JDWP threadid changes during debugging session (leading to ingored breakpoints)

Summary: New test for the above fix.
Reviewed-by: tbell

test/com/sun/jdi/BreakpointWithFullGC.sh

+#!/bin/sh
+
+#
+# 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.
+#
+
+#  @test
+#  @bug 6862295
+#  @summary Verify breakpoints still work after a full GC.
+#  @author dcubed (based on the test program posted to the following
+#  Eclipse thread https://bugs.eclipse.org/bugs/show_bug.cgi?id=279137)
+#
+#  @run shell BreakpointWithFullGC.sh
+
+compileOptions=-g
+# Hijacking the mode parameter to make sure we use a small amount
+# of memory and can see what GC is doing.
+mode="-Xmx32m -verbose:gc"
+# Force use of a GC framework collector to see the original failure.
+#mode="$mode -XX:+UseSerialGC"
+
+# Uncomment this to see the JDI trace
+#jdbOptions=-dbgtrace
+
+createJavaFile()
+{
+    cat <<EOF > $1.java.1
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class $1 {
+    public static List<Object> objList = new ArrayList<Object>();
+
+    private static void init(int numObjs) {
+        for (int i = 0; i < numObjs; i++) {
+            objList.add(new Object());
+        }
+    }
+
+    public static void main(String[] args) {
+        for (int i = 0; i < 10; i++) {
+            System.out.println("top of loop");     // @1 breakpoint
+            init(1000000);
+            objList.clear();
+            System.out.println("bottom of loop");  // @1 breakpoint
+        }
+        System.out.println("end of test");         // @1 breakpoint
+    }
+}
+
+EOF
+}
+
+# This is called to feed cmds to jdb.
+dojdbCmds()
+{
+    setBkpts @1
+
+    # get to the first loop breakpoint
+    runToBkpt
+    # 19 "cont" commands gets us through all the loop breakpoints.
+    # Use for-loop instead of while-loop to avoid creating processes
+    # for '[' and 'expr'.
+    for ii in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19; do
+        contToBkpt
+    done
+    # get to the last breakpoint
+    contToBkpt
+}
+
+
+mysetup()
+{
+    if [ -z "$TESTSRC" ] ; then
+        TESTSRC=.
+    fi
+
+    for ii in . $TESTSRC $TESTSRC/.. ; do
+        if [ -r "$ii/ShellScaffold.sh" ] ; then
+            . $ii/ShellScaffold.sh
+            break
+        fi
+    done
+}
+
+# You could replace this next line with the contents
+# of ShellScaffold.sh and this script will run just the same.
+mysetup
+
+runit
+
+# make sure we hit the first breakpoint at least once
+jdbFailIfNotPresent 'System\..*top of loop'
+
+# make sure we hit the second breakpoint at least once
+jdbFailIfNotPresent 'System\..*bottom of loop'
+
+# make sure we hit the last breakpoint
+jdbFailIfNotPresent 'System\..*end of test'
+
+# make sure we had at least one full GC
+debuggeeFailIfNotPresent 'Full GC'
+
+# check for error message due to thread ID change
+debuggeeFailIfPresent \
+    'Exception in thread "event-handler" java.lang.NullPointerException'
+
+pass