#429 drJava has problem with UNC filenames

[Dan McCuaig]

When trying to run a successfully compiled java program
on a Windows network, we have problems with the pathname.

see attached pictures.

When we use a UNC path:

\\CTS.WVC\studocs$\jstudent1234\MyProg.java

drJava cannot run the compiled class file

When we map a drive to this location to get
( H: = \\CTS.WVC\studocs$\jstudent1234 )

H:\MyProg.java

It works okay.

We are still accessing the same file, but using two
different ways - one works and the other doesn't.

Our environment:

workstation: Windows XP with service pack 2
network: Windows 2003 Domain
java: JDK 1.5.0_06
drJava: 20050814-2234

[Dan McCuaig]

Screen shot

[Christopher Warrington]

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This is more than just annoying. It is downright confusing
and will crash DrJava at times.

[Dan McCuaig]

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user_id=1208400

On a windows system, I wonder if drJava shells out using a
command prompt.

In Windows XP, if one opens a command prompt window
(cmd.exe), UNC filenames are unsupported.
The way around this is to map a drive to the UNC filename,
and use this new drive mapped path.

I think this is fixed in Vista, and also in Windows Powershell.

Netbeans has some problems with UNC files, but Eclipse does not.

[Nobody/Anonymous]

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Thank you for submitting this bug! I was going crazy in my class trying to figure out why one kid could run a program on one computer, and another kid could not (on the same computer).

The h:\ fix is easy for me. I'll try it tomorrow!

[Dan McCuaig]

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I have spent time tracing thru the drJava source code trying to find out more info on this problem.

Here is what I have found:

If I compile and execute a program called simple.class as:

\\csc.wvc\users\faculty\data\dmccuaig\simple.class

I get

Welcome to DrJava. Working directory is \\csc.wvc\users\faculty\data\dmccuaig
> java simple
Error: Undefined class 'simple'

Using the _log class in DynamicJavaAdapter.java, I was able to tease out some more information about the exception:

koala.dynamicjava.interpreter.error.ExecutionError: Undefined class 'simple'

at koala.dynamicjava.interpreter.NameVisitor.visit(NameVisitor.java:726)
at koala.dynamicjava.interpreter.NameVisitor.visit(NameVisitor.java:49)
at koala.dynamicjava.tree.QualifiedName.acceptVisitor(QualifiedName.java:123)
at koala.dynamicjava.interpreter.NameVisitor.visit(NameVisitor.java:582)
at koala.dynamicjava.interpreter.NameVisitor.visit(NameVisitor.java:49)
at koala.dynamicjava.tree.ObjectMethodCall.acceptVisitor(ObjectMethodCall.java:101)
at edu.rice.cs.drjava.model.repl.DynamicJavaAdapter$InterpreterExtension.interpret(DynamicJavaAdapter.java:425)
at edu.rice.cs.drjava.model.repl.DynamicJavaAdapter.interpret(DynamicJavaAdapter.java:94)
at edu.rice.cs.drjava.model.repl.newjvm.InterpreterJVM$4.run(InterpreterJVM.java:249)

After using a mapped drive ( H: = \\csc.wvc\users\faculty\data\dmccuaig )
I compile and execute a program called simple.class as:

H:\simple.class

I get

Welcome to DrJava. Working directory is H:\ > java simple
The answer to life, the universe, and everthing
is.....
..... 42

I wrote a another java program to intentionally throw an exception.
I ran it using this H: drive mapping, and
this is what I got:

java.lang.Exception
at simple2.main(simple2.java:11)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at koala.dynamicjava.interpreter.EvaluationVisitor.visit(EvaluationVisitor.java:1105)
at edu.rice.cs.drjava.model.repl.EvaluationVisitorExtension.visit(EvaluationVisitorExtension.java:261)
at koala.dynamicjava.tree.StaticMethodCall.acceptVisitor(StaticMethodCall.java:109)
at edu.rice.cs.drjava.model.repl.DynamicJavaAdapter$InterpreterExtension.interpret(DynamicJavaAdapter.java:442)
at edu.rice.cs.drjava.model.repl.DynamicJavaAdapter.interpret(DynamicJavaAdapter.java:94)
at edu.rice.cs.drjava.model.repl.newjvm.InterpreterJVM$4.run(InterpreterJVM.java:249)

When comparing the two stack traces, it appears the problem is in DynamicJava
and starts at
koala.dynamicjava.interpreter.NameVisitor.visit(QualifiedName node)
around line 714

The exception ExecutionError("undefined.class", node) gets thrown

I noticed that DynamicJava is compiled under JDK1.4 - would a later JDK make a difference (or would it break DynamicJava?)

I will keep looking more into this as time permits. I have trouble when I try to debug using Eclipse, so printing out log files seems to be the best bet.

[Nobody/Anonymous]

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This error happens in my lab under Java 5.

Also, a weird thing is that it happens on SOME kids with UNC paths, and NOT on others!

[Mathias Ricken]

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We cannot attempt to fix this bug without more information. Please post another comment detailing what you were doing to cause this to happen. If you have it, please include the information from the DrJava error window.

Thanks,
The DrJava Team

[SourceForge Robot]

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This Tracker item was closed automatically by the system. It was
previously set to a Pending status, and the original submitter
did not respond within 14 days (the time period specified by
the administrator of this Tracker).

[Mathias Ricken]

This is still occurring. We seem to be able to open and compile a file with a UNC filename, but it is not found in the Interactions Pane.