Vm.process().getInputStream().read() hangs if the VM is suspended?

Question

I use a LaunchConnector to launch a application. When I was using the vm.process().getInputStream().read() method to read the output of the application, I found the read() method blocked if the VM is suspended. However , after the VMDeathEvent ,the read() method run smoothly. Is that means if I want the output I must wait for the completion of the application?
I'm writing a debug tools . I want to get the output message while the application is being debuged.
Below are simple codes for my problem:
public class MyTest {
     public static void main(String[] args){
          List connectors = Bootstrap.virtualMachineManager().allConnectors();
          LaunchingConnector lc=findLaunchingConnector(connectors);
          Map arguments=lc.defaultArguments();
Connector.Argument mainArg=(Connector.Argument)arguments.get("main");
VirtualMachine vm;
mainArg.setValue("fore");//fore is a simpl application
try {
     vm=lc.launch(arguments);
     vm.resume();//if this is removed,the next code will be blocks
vm.process().getInputStream().read();
}catch(Exception e){
     throw new Error("can't launch the application");//ignore for simplification
     public static LaunchingConnector findLaunchingConnector(List cs){
          Iterator iter=cs.iterator();
          while(iter.hasNext()){
               Connector c=(Connector)iter.next();
               if(c.name().equals("com.sun.jdi.CommandLineLaunch"))
                    return (LaunchingConnector)c;     
          return null;
}

Answer 1

hello,
thank you for your answer!
When i try to read the stream nevertheless:
process.getInputStrem().read() = -1
There ist still another thing, which I understand...
process.exitValue() is 13. Which for an error could be it??
regards,
Joana