Adding the following System.out.println() line to CodeCompiler.java

Index: C:/workspace/jython_svn/jython/src/org/python/compiler/CodeCompiler.java
===================================================================
--- C:/workspace/jython_svn/jython/src/org/python/compiler/CodeCompiler.java	(revision 3248)
+++ C:/workspace/jython_svn/jython/src/org/python/compiler/CodeCompiler.java	(working copy)
@@ -859,6 +859,7 @@
             }
             makeStrings(code, names, names.length);
 
+            System.out.println("thread="+Thread.currentThread()+", mod="+node.module +", names="+names[0]);
             loadFrame();
             if (mrefs.importFrom == 0) {
                 mrefs.importFrom = code.pool.Methodref(



and changing the catch clause in Test.java to:
    } catch (Throwable t) {
        failures++;
        Throwable debug = new Throwable("error in thread ="+Thread.currentThread(), t);
        debug.printStackTrace(w);
        //w.println(t);
        w.flush();
    }



produces the following output line (among many other correct ones):

thread=Thread[Thread-7,10,main], mod=sys.util, names=List


while the import error later, on the same thread, is:

java.lang.Throwable: error in thread =Thread[Thread-7,10,main]
	at threadtest.Test$1.run(Test.java:81)
Caused by: Traceback (innermost last):
  File "<string>", line 18, in ?
ImportError: 3 no module named util

	at org.python.core.Py.ImportError(Py.java:228)
	at org.python.core.imp.import_logic(imp.java:614)
	at org.python.core.imp.import_name(imp.java:669)
	at org.python.core.imp.importName(imp.java:700)
	at org.python.core.ImportFunction.load(__builtin__.java:1171)
	at org.python.core.ImportFunction.__call__(__builtin__.java:1167)
	at org.python.core.PyObject.__call__(PyObject.java:476)
	at org.python.core.__builtin__.__import__(__builtin__.java:1143)
	at org.python.core.imp.importFromAs(imp.java:755)
	at org.python.core.imp.importFrom(imp.java:737)
	at org.python.pycode._pyx15.f$0(<string>:18)
	at org.python.pycode._pyx15.call_function(<string>)
	at org.python.core.PyTableCode.call(PyTableCode.java:217)
	at org.python.core.PyCode.call(PyCode.java:14)
	at org.python.core.Py.runCode(Py.java:1225)
	at org.python.core.Py.exec(Py.java:1251)
	at org.python.util.PythonInterpreter.exec(PythonInterpreter.java:135)
	at threadtest.Test$1.run(Test.java:78)
Failures: 1





I'm not 100% sure that every ImporError has a corresponding output line.
And we should keep in mind that there are NameErrors, too.