Using Jython From Eclipse Plugin
java, jython, python
Solution
Finally figure this one out. Here is what I had to do:
1) I used the JSR223 ScriptEngine instead of PythonInterpreter:
`engine.get(module_name); //gets the class object of the module getConstructors[0].newInstance(null) on the class to get an object //cast it to your interface!`
2) Make sure your Eclipse plugin isn't packaged as a jar (in 3.5 set Eclipse-BundleShape: dir) 3) Add jython.jar and any paths where you want to locate modules to your Runtime Classpath in the Manifest.
Hope this helps someone.
Problem
I am having a tough time getting jython to work properly when run from an Eclipse plugin. I have a simple object factory that loads a python module conforming to a Java Interface. All of this works fine in standalone mode. However, when I package this as an eclipse plugin, I get a different error based on a few variables: Given that my java package is com.foo. 1) If I run without modifying any paths, I get: "No module named foo" 2) If I then add my java jars to the sys.path using: ``` PythonInterpreter interp = new PythonInterpreter(null, new PySystemState()); PySystemState sys = Py.getSystemState(); sys.path.append(new PyString("myjar...")); ``` I get: a) My python module's constructor gets called (print in the constr shows up) b) I get a PySingleton returned from the call to tojava. The name field is "Error". 3) At this point, I try to make the classpath exactly the same in Eclipse as Standalone, so I add my jars to the classpath at runtime just before the python interpreter is called. I get my favorite error message: SystemError: Automatic proxy initialization should only occur on proxy classes This one is driving me crazy. I was impressed with how fast I got this going in standalone mode. Should running under Eclipse be that much different? I believe it should only be a matter of the classpath, but so far, that doesn't seem to be it.