[DrJava] [ drjava-Bugs-1472678 ] strange traceback in interactions window

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Bugs item #1472678, was opened at 2006-04-18 17:19
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Category: Interactions
Group: 4: Serious
Status: Open
Resolution: None
Priority: 5
Submitted By: hperkins (hperkins)
Assigned to: Nobody/Anonymous (nobody)
Summary: strange traceback in interactions window

Initial Comment:
In the most recent beta (windows xp 20060407, but
20060410-2202 in the help window), exceptions thrown in
the interactions window are producing an incomplete
traceback followed by extraneous details that didn't
used to be there.  I've seen several examples, but I
think they all can be distilled to something like the
following.

Compile the following class:

public class TestThrow {
  private int n;
  
  private void check(int k) {
    if (k < 0 || k >= n) {
      throw new IndexOutOfBoundsException();
    }
  }
  
  public void doit(int val) {
    n = 5;
    check(val);
  }
}

Then create an instance of thisin the interactions
window called, say, t, and enter t.doit(17).  That
should produce a traceback showing that the exception
was thrown in check, which was called by doit. 
Instead, the following appears.

Exception in thread "interpret thread: t.doit(17)"
java.lang.NullPointerException
	at
edu.rice.cs.drjava.model.repl.InteractionsDocument.appendExceptionResult(InteractionsDocument.java:320)
	at
edu.rice.cs.drjava.model.repl.InteractionsModel.replThrewException(InteractionsModel.java:489)
	at
edu.rice.cs.drjava.model.repl.newjvm.MainJVM$ResultHandler.forExceptionResult(MainJVM.java:840)
	at
edu.rice.cs.drjava.model.repl.newjvm.ExceptionResult.apply(ExceptionResult.java:88)
	at
edu.rice.cs.drjava.model.repl.newjvm.MainJVM.interpretResult(MainJVM.java:249)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native
Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown
Source)
	at
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown
Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at sun.rmi.server.UnicastServerRef.dispatch(Unknown
Source)
	at sun.rmi.transport.Transport$1.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native
Method)
	at sun.rmi.transport.Transport.serviceCall(Unknown Source)
	at
sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown
Source)
	at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown
Source)
	at java.lang.Thread.run(Unknown Source)
	at
sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(Unknown
Source)
	at
sun.rmi.transport.StreamRemoteCall.executeCall(Unknown
Source)
	at sun.rmi.server.UnicastRef.invoke(Unknown Source)
	at
edu.rice.cs.drjava.model.repl.newjvm.MainJVM_Stub.interpretResult(Unknown
Source)
	at
edu.rice.cs.drjava.model.repl.newjvm.InterpreterJVM$4.run(InterpreterJVM.java:308)




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