[Jython-users] "Bad magic number" error

[Andrew K. <aku...@me...>]

I'm trying to build an applet with Jython 2.0 (it worked fine with
1.0something), and am getting a mysterious error from the resulting
JAR file.

Java Traceback:
	at org.python.core.Py.JavaError(Py.java:238)
	at org.python.core.Py.findClassEx(Py.java:620)
        ...
	at java.lang.Thread.run(Thread.java:484)
Traceback (innermost last):
  File "/home/akuchlin/src/mems/proto3/instrument/client/awt/MicroscopeApplet.py", line 0, in main
  File "/home/akuchlin/src/mems/proto3/instrument/client/awt/PyClient.py", line 0, in main
  File "/usr/local/jython-2.0/Lib/string.py", line 0, in main
java.lang.ClassFormatError: strop (Bad magic number)

(Full traceback below, in case that information is useful.)
Inspecting the JAR file finds that strop.class isn't in it, but
string.py should surely get an ImportError and continue running.  The
same error occurs with both the Sun and IBM JVMs. Has anyone seen this
before?  Anyone got a clue about its cause?

--amk

Java Traceback:

	at org.python.core.Py.JavaError(Py.java:238)
	at org.python.core.Py.findClassEx(Py.java:620)
	at org.python.core.SysPackageManager.findClass(SysPackageManager.java:91)
	at org.python.core.PackageManager.findClass(PackageManager.java:19)
	at org.python.core.SysPackageManager.findClass(SysPackageManager.java:83)
	at org.python.core.PyJavaPackage.__findattr__(PyJavaPackage.java:128)
	at org.python.core.PackageManager.lookupName(PackageManager.java:96)
	at org.python.core.imp.load(imp.java:361)
	at org.python.core.imp.load(imp.java:376)
	at org.python.core.imp.importName(imp.java:447)
	at org.python.core.imp.importName(imp.java:509)
	at org.python.core.ImportFunction.load(__builtin__.java:967)
	at org.python.core.ImportFunction.__call__(__builtin__.java:961)
	at org.python.core.PyObject.__call__(PyObject.java:250)
	at org.python.core.__builtin__.__import__(__builtin__.java:921)
	at org.python.core.imp.importFromAs(imp.java:566)
	at string$_PyInner.main$27(string.java:724)
	at string$_PyInner.call_function(string.java:228)
	at org.python.core.PyTableCode.call(PyTableCode.java:155)
	at org.python.core.imp.createFromCode(imp.java:157)
	at org.python.core.imp.createFromClass(imp.java:178)
	at org.python.core.imp.loadPrecompiled(imp.java:246)
	at org.python.core.imp.loadFromPath(imp.java:257)
	at org.python.core.imp.loadFromPath(imp.java:252)
	at org.python.core.imp.load(imp.java:357)
	at org.python.core.imp.load(imp.java:376)
	at org.python.core.imp.importName(imp.java:447)
	at org.python.core.imp.importName(imp.java:509)
	at org.python.core.ImportFunction.load(__builtin__.java:967)
	at org.python.core.ImportFunction.__call__(__builtin__.java:961)
	at org.python.core.PyObject.__call__(PyObject.java:250)
	at org.python.core.__builtin__.__import__(__builtin__.java:921)
	at org.python.core.imp.importOne(imp.java:518)
	at PyClient$_PyInner.main$20(PyClient.java:736)
	at PyClient$_PyInner.call_function(PyClient.java:246)
	at org.python.core.PyTableCode.call(PyTableCode.java:155)
	at org.python.core.imp.createFromCode(imp.java:157)
	at org.python.core.imp.createFromClass(imp.java:178)
	at org.python.core.imp.loadPrecompiled(imp.java:246)
	at org.python.core.imp.loadFromPath(imp.java:257)
	at org.python.core.imp.loadFromPath(imp.java:252)
	at org.python.core.imp.load(imp.java:357)
	at org.python.core.imp.load(imp.java:376)
	at org.python.core.imp.importName(imp.java:447)
	at org.python.core.imp.importName(imp.java:509)
	at org.python.core.ImportFunction.load(__builtin__.java:967)
	at org.python.core.ImportFunction.__call__(__builtin__.java:961)
	at org.python.core.PyObject.__call__(PyObject.java:250)
	at org.python.core.__builtin__.__import__(__builtin__.java:921)
	at org.python.core.imp.importOne(imp.java:518)
	at MicroscopeApplet$_PyInner.main$6(MicroscopeApplet.java:111)
	at MicroscopeApplet$_PyInner.call_function(MicroscopeApplet.java:62)
	at org.python.core.PyTableCode.call(PyTableCode.java:155)
	at org.python.core.imp.createFromCode(imp.java:157)
	at org.python.core.Py.initProxy(Py.java:731)
	at MicroscopeApplet.<init>(MicroscopeApplet.java:247)
	at java.lang.Class.newInstance0(Native Method)
	at java.lang.Class.newInstance(Class.java:237)
	at sun.applet.AppletPanel.createApplet(AppletPanel.java:579)
	at sun.plugin.AppletViewer.createApplet(AppletViewer.java:1178)
	at sun.applet.AppletPanel.runLoader(AppletPanel.java:515)
	at sun.applet.AppletPanel.run(AppletPanel.java:293)
	at sun.plugin.navig.motif.MotifAppletViewer.maf_run(MotifAppletViewer.java:127)
	at sun.plugin.navig.motif.MotifAppletViewer.run(MotifAppletViewer.java:123)
	at java.lang.Thread.run(Thread.java:484)
Traceback (innermost last):
  File "/home/akuchlin/src/mems/proto3/instrument/client/awt/MicroscopeApplet.py", line 0, in main
  File "/home/akuchlin/src/mems/proto3/instrument/client/awt/PyClient.py", line 0, in main
  File "/usr/local/jython-2.0/Lib/string.py", line 0, in main
java.lang.ClassFormatError: strop (Bad magic number)