Issue1145

package jython;

import java.util.Arrays;
import java.util.List;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

class Foo {
	private int amount;

	public Foo(int amount) {
		this.amount = amount;
	}

	public int getAmount() {
		return amount;
	}

	public void setAmount(int amount) {
		this.amount = amount;
	}
}

public class JythonExpression {
	public static void main(String[] args) {

		final List<Foo> foos = Arrays.asList(new Foo(200), new 
Foo(10), new Foo(5000));
		ScriptEngine engine = new ScriptEngineManager()
				.getEngineByName("python");

		engine.put("foos", foos);
		engine.put("afoo", new Foo(12));
		try {
			Boolean result = 
(Boolean)engine.eval("foo.amount > 1");
			System.out.println(result);
		} catch (ScriptException e) {
			e.printStackTrace();
		}
	}

}


results in :
Exception in thread "main" java.lang.VerifyError: class 
com.sun.script.jython.JythonScope overrides final method 
__findattr__.(Ljava/lang/String;)Lorg/python/core/PyObject;
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:675)
	at 
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
	at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:316)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:288)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:374)
	at 
com.sun.script.jython.JythonScriptEngineFactory.getScriptEngine(JythonSc
riptEngineFactory.java:132)
	at 
javax.script.ScriptEngineManager.getEngineByName(ScriptEngineManager.jav
a:225)
	at jython.JythonExpression.main(JythonExpression.java:31)

The breakage is obviously related to the PyObject API change I made on
r5155 (__findattr__ refactor). Looks like we will have to submit an
alternative engine ("python25?"). Which makes me wonder if JSR 223
contains any provision to support different versions of the same
language. In such case, we may want to exploit that.

I also encountered this while trying to get Jython 2.5 working with Ant's 
script task. Only managed to get Jython 2.2.1 working.