[Jython-dev] jythonc breaks "import random"

[Chris M. <ch...@bo...>]

My program works fine in jython, but I can't use jythonc to create an 
applet.

I narrowed the problem down to this line of python code:

    import random

The stack trace given when I try to run the applet is as follows (it's 
longer than that, but I'm trying to keep the message short).

 Java Traceback:

        at org.python.core.Py.JavaError(Py.java)
        at org.python.core.BytecodeLoader.makeCode(BytecodeLoader.java)
        at org.python.core.Py.compile_flags(Py.java)
        at org.python.core.Py.compile_flags(Py.java)
        at org.python.core.Py.compile_flags(Py.java)
        at org.python.core.__builtin__.eval(__builtin__.java)
        at org.python.core.__builtin__.eval(__builtin__.java)
        at java.lang.reflect.Method.invoke(Native Method)
        at 
org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java)
        at 
org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java)
        at org.python.core.PyObject.__call__(PyObject.java)
        at random$_PyInner._verify$1(random.java:377)
        at random$_PyInner.call_function(random.java:310)
        at org.python.core.PyTableCode.call(PyTableCode.java)
        at org.python.core.PyTableCode.call(PyTableCode.java)
        at org.python.core.PyFunction.__call__(PyFunction.java)
        at random$_PyInner.main$31(random.java:1029)
        at random$_PyInner.call_function(random.java:370)
        at org.python.core.PyTableCode.call(PyTableCode.java)
        at org.python.core.PyCode.call(PyCode.java)

    <snip>

So, it appears that the _verify method in the random module is doing an 
eval!  That's all well and good, but I don't have org.python.core.parser 
anywhere in my jar file.  Oops.

It turns out that adding that file doesn't help.  If I use the --all 
flag, I get this:
Java Traceback:

        at org.python.core.Py.JavaError(Py.java)
        at org.python.core.BytecodeLoader.makeCode(BytecodeLoader.java)
        at org.python.core.Py.compile_flags(Py.java)
        at org.python.core.Py.compile_flags(Py.java)
        at org.python.core.Py.compile_flags(Py.java)
        at org.python.core.__builtin__.eval(__builtin__.java)
        at org.python.core.__builtin__.eval(__builtin__.java)
        at java.lang.reflect.Method.invoke(Native Method)
        at 
org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java)
        at 
org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java)
        at org.python.core.PyObject.__call__(PyObject.java)
        at random$_PyInner._verify$1(random.java:377)

....

  File "/usr/local/jython-2.1a3/Lib/random.py", line 0, in main
  File "/usr/local/jython-2.1a3/Lib/random.py", line 0, in _verify
java.security.AccessControlException: access denied 
(java.lang.RuntimePermission createClassLoader)
        at 
java.security.AccessControlContext.checkPermission(AccessControlContext.java:272)
        at 
java.security.AccessController.checkPermission(AccessController.java:399)
        at 
java.lang.SecurityManager.checkPermission(SecurityManager.java:545)
        at 
java.lang.SecurityManager.checkCreateClassLoader(SecurityManager.java:610)   

        at java.lang.ClassLoader.<init>(ClassLoader.java:234)
        at org.python.core.BytecodeLoader1.<init>(BytecodeLoader1.java)
        at org.python.core.BytecodeLoader.makeLoader(BytecodeLoader.java)
        at org.python.core.BytecodeLoader.makeClass(BytecodeLoader.java)
        at org.python.core.BytecodeLoader.makeCode(BytecodeLoader.java)
        at org.python.core.Py.compile_flags(Py.java)
        at org.python.core.Py.compile_flags(Py.java)
        at org.python.core.Py.compile_flags(Py.java)

etc, etc.

So, I tried not importing random at all, but rather doing a simple eval:

print eval("1 + 1")

Again, I am required to use --all (which kind of makes sense), and 
again, I get an AccessControlException just like above.

Does this mean that I can't use eval or any module that uses eval in my 
applets?

C