Bug 363563

Description Robert.Welters 2011-11-11 05:13:54 EST

Build Identifier: 20110301-1815

The only class in my Java Project is:

public class RuntimeExcecutor {
   public static void main(String[] args) throws Exception {
      Process process = Runtime.getRuntime().exec("java one/two/three/DoesNotExist.class");
      process.waitFor();
   }
}

When I run this class via a run configuration or directly via "Run As" -> "Java Application" then the execution hangs. Of course, the execution of the java command inside of Runtime.exec() is not expected to be successful, as the called class does not exist. However, the run configuration should not hang.

When I add debugging options to the java command inside of the Runtime.exec() and use remote debugging then I can see that the execution hangs with the following stack trace:
RuntimeExcecutor_Debugger [Remote Java Application]   
   Java HotSpot(TM) Client VM[localhost:8000]   
      Thread [main] (Suspended)   
         FileOutputStream.writeBytes(byte[], int, int) line: not available [native method]   
         FileOutputStream.write(byte[], int, int) line: 260   
         BufferedOutputStream.flushBuffer() line: 65   
         BufferedOutputStream.flush() line: 123   
         PrintStream.write(byte[], int, int) line: 432   
         StreamEncoder.writeBytes() line: 202   
         StreamEncoder.implFlushBuffer() line: 272   
         StreamEncoder.flushBuffer() line: 85   
         OutputStreamWriter.flushBuffer() line: 168   
         PrintStream.write(String) line: 477   
         PrintStream.print(String) line: 619   
         PrintStream.println(String) line: 756   
         ClassNotFoundException(Throwable).printStackTraceAsCause(PrintStream, StackTraceElement[]) line: 490   
         NoClassDefFoundError(Throwable).printStackTrace(PrintStream) line: 468   
         NoClassDefFoundError(Throwable).printStackTrace() line: 451   

The problem seems that writing to the console is inhibited.
The above class is made minimal just for demonstration purposes. In my actual program I use Runtime.exec() to call a java program that prints to System.out and/or logs to the console and hangs there.

Reproducible: Always

Steps to Reproduce:
1. Create a Java Project with just one class as shown above (can be in the default package).
2. In the .java file of the class click the right mouse button and select "Run As" -> "Java Application".
3. The started run configuration hangs and never finishes, i.e. the red square button "Stop" remains enabled. In the debug perspective one can see the running program.
4. In order to find the line where it hangs add debug options:
Process process = Runtime.getRuntime().exec("java -Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=8000 -DebugPort=8000 one/two/three/DoesNotExist.class");
5. After the program hangs, start a Remote Java Application Debug Configuration.
6. In the debug perspective suspend the remote debugging thread to see the stack trace as shown above.
7. By the way, the remote debugger does not connect, if I have less than three package levels specified for my not existing class, but the actual application still hangs.