8315486: vmTestbase/nsk/jdwp/ThreadReference/ForceEarlyReturn/forceEarlyReturn002/forceEarlyReturn002.java timed out

test/hotspot/jtreg/vmTestbase/nsk/jdwp/ThreadReference/ForceEarlyReturn/forceEarlyReturn002/forceEarlyReturn002.java

@@ -139,13 +139,34 @@ private void sendCommand(long threadID, Value value, boolean expectError, int er
         }
     }
 
+    // get thread ID for "startNewThread" command
+    private long getNewThreadId() throws Exception {
+        final String debugeeClassSig = "L" + getDebugeeClassName().replace('.', '/') + ";";
+        log.display("  getting classID for " + debugeeClassSig);
+        long classID = debuggee.getReferenceTypeID(debugeeClassSig);
+        log.display("  got classID: " + classID);
+
+        log.display("  getting testNewThread field value");
+        JDWP.Value value = debuggee.getStaticFieldValue(classID, "testNewThread", JDWP.Tag.THREAD);
+
+        long threadID = ((Long)value.getValue()).longValue();
+        log.display("  got threadID: " + threadID);
+        return threadID;
+    }
+
     private int createThreadStartEventRequest() {
         try {
+            long newThreadId = getNewThreadId();
             // create command packet and fill requred out data
             CommandPacket command = new CommandPacket(JDWP.Command.EventRequest.Set);
             command.addByte(JDWP.EventKind.THREAD_START);
             command.addByte(JDWP.SuspendPolicy.ALL);
-            command.addInt(0);
+            // we want the THREAD_START event only for the test thread
+            // and not any others that might be started by debuggee VM,
+            // so add THREAD_ONLY modifier
+            command.addInt(1);
+            command.addByte(JDWP.EventModifierKind.THREAD_ONLY);
+            command.addObjectID(newThreadId);
             command.setLength();
 
             transport.write(command);
@@ -175,7 +196,7 @@ public void doTest() {
         Value value;
 
         value = new Value(JDWP.Tag.INT, 0);
-        // create command with invalid trheadID, expect INVALID_OBJECT error
+        // create command with invalid threadID, expect INVALID_OBJECT error
         sendCommand(-1, value, true, JDWP.Error.INVALID_OBJECT);
 
         // create StateTestThread

test/hotspot/jtreg/vmTestbase/nsk/jdwp/ThreadReference/ForceEarlyReturn/forceEarlyReturn002/forceEarlyReturn002a.java

@@ -51,21 +51,29 @@ public boolean parseCommand(String command) {
 
             return true;
         } else if (command.equals(COMMAND_START_NEW_THREAD)) {
-            Thread thread = new Thread(new Runnable() {
-                public void run() {
-                    log.display("Thread exit");
-                }
-            });
-
-            thread.setName("forceEarlyReturn002a_NewThread");
-            thread.start();
+            testNewThread.start();
 
             return true;
         }
 
         return false;
     }
 
+    @Override
+    protected void init(String args[]) {
+        super.init(args);
+
+        // create thread for "NewThread" command in advance
+        testNewThread = new Thread(new Runnable() {
+            public void run() {
+                log.display("Thread exit");
+            }
+        });
+        testNewThread.setName("forceEarlyReturn002a_NewThread");
+    }
+
+    private static Thread testNewThread;
+
     private Thread testThreadInNative;
 
     private void stopThreadInNative() {