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.

Need by GA. We will see if we can use the discovery protocol to mask the
prior version.

Deferred to 2.5.1
Jsr223 branch tracks this work

Would be great to bundle JSR 223 implementation like Groovy did. See
http://jira.codehaus.org/browse/GROOVY-1594.

The jsr223 branch has the outline of support for jsr223 within Jython, 
just like Groovy 1.6. However, this development missed the beta cutoff 
period, so it had to be deferred to 2.5.1.

In addition, we should be able to support a more comprehensive 
integration, again like Groovy.

Ok great. Sorry i did not understood what "Jsr223 branch tracks this
work" meant in your previous comment.

I would say it's critical but raised the severity of the ticket since it's 
a goal for 2.5.1 afaik, and I'd love to use this.

The JSR 223 branch has been merged into trunk.  Please test it and file 
(additional) bugs if you run into any issues.

Thanks.