using custom java classes with JPype: package not callable error

Question

I'm trying to get a very simple example of using JPype (Version: 0.5.4.6) to instantiate a custom java class from within Python. It loosely follows an example: http://hustleplay.wordpress.com/2010/02/18/jpype-tutorial/ and is related to: JPype Headaches here's the python code (in /Users/me/jpypeTest/testjpype.py): ``` from jpype import * cpopt="-Djava.class.path=%s" % ("/Users/me/jpypeTest") startJVM(getDefaultJVMPath(),"-ea",cpopt) print "JVM path:",getDefaultJVMPath() print "classpath:",cpopt java.lang.System.out.println("Hello World!!") testPkg = JPackage('pkg') Test = testPkg.Test Test.speak("hi") shutdownJVM() ``` and here's the java code (in /Users/me/jpypeTest/pkg/Test.java): ``` package pkg; public class Test { private String msg; public Test() { msg = "nothing so far..."; } public static void speak(String msg) { System.out.println(msg); } } ``` compiled using: ``` javac Test.java ``` to produce /Users/me/jpypeTest/pkg/Test.class without errors (I have also tried putting Test.…

Accepted Answer

The issue appears to be that accessing an attribute of a JPackage class returns a JPackage class when what you really want is a JClass. Changing the testjpype.py to be this worked for me:

```
from jpype import *
cpopt="-Djava.class.path=%s" % ("/Users/me/jpypeTest")
startJVM(getDefaultJVMPath(),"-ea",cpopt)
java.lang.System.out.println("Hello World!!")
Test = JClass('pkg.Test')
Test.speak("hi")
shutdownJVM()
```

using custom java classes with JPype: package not callable error

Solution

Problem