Issue 12 in objenesis: Objenesis can't work on the Google Apps Engine

[obje...@googlecode.com]

Status: New
Owner: ----

New issue 12 by mario.fusco: Objenesis can't work on the Google Apps Engine
http://code.google.com/p/objenesis/issues/detail?id=12

Trying to use objenesis on GAE the following exception is thrown

java.lang.NoClassDefFoundError: sun.reflect.ReflectionFactory is a
restricted class.
Please see the Google App Engine developer's guide for more details.
at
com.google.appengine.tools.development.agent.runtime.Runtime.reject(Runtime.java:51)
at
org.objenesis.instantiator.sun.SunReflectionFactoryInstantiator.<init>(SunReflectionFactoryInstantiator.java:40)
at
org.objenesis.strategy.StdInstantiatorStrategy.newInstantiatorOf(StdInstantiatorStrategy.java:85)
at org.objenesis.ObjenesisBase.getInstantiatorOf(ObjenesisBase.java:90)
at org.objenesis.ObjenesisBase.newInstance(ObjenesisBase.java:73)

[obje...@googlecode.com]

Updates:
Status: Accepted

Comment #1 on issue 12 by henri.tremblay: Objenesis can't work on the

Google Apps Engine
http://code.google.com/p/objenesis/issues/detail?id=12

Objenesis is indeed using some restricted classes. I'm not sure we can
workaround it.

Some insider information (from Google App Engine team) would be really
helpful

Anyhow, we'll look into it.

[obje...@googlecode.com]

Updates:
Labels: Milestone-1.3

Comment #2 on issue 12 by henri.tremblay: Objenesis can't work on the

Google Apps Engine
http://code.google.com/p/objenesis/issues/detail?id=12

(No comment was entered for this change.)

[obje...@googlecode.com]

Comment #4 on issue 12 by grego...@gmail.com: Objenesis can't work on the

Google Apps Engine
http://code.google.com/p/objenesis/issues/detail?id=12

It also a problem for lamdaj

[obje...@googlecode.com]

Updates:
Labels: -Milestone-1.3 Milestone-2.0

Comment #5 on issue 12 by henri.tr...@gmail.com: Objenesis can't work on

the Google Apps Engine
http://code.google.com/p/objenesis/issues/detail?id=12

[obje...@googlecode.com]

Comment #6 on issue 12 by xyb...@gmail.com: Objenesis can't work on the

Google Apps Engine
http://code.google.com/p/objenesis/issues/detail?id=12

Was there any chance on making Objenesis work with GAE? If we implement our
own version of sun.reflect.ReflectionFactory, would be a work-around?

--
You received this message because this project is configured to send all
issue notifications to this address.
You may adjust your notification preferences at:
https://code.google.com/hosting/settings

[obje...@googlecode.com]

Comment #7 on issue 12 by henri.tr...@gmail.com: Objenesis can't work on

the Google Apps Engine
http://code.google.com/p/objenesis/issues/detail?id=12

I would of course be interested. Can someone try Unsafe.allocateInstance? I
will as soon as I have the time but I can't say when.

Then, if someone has an answer, I'm listening.

[obje...@googlecode.com]

Comment #8 on issue 12 by i...@google.com: Objenesis can't work on the

Google Apps Engine
http://code.google.com/p/objenesis/issues/detail?id=12

(Disclaimer: I'm a Googler, but I have no particular insider knowledge of
App Engine)


I had a bit of time, so I tried Unsafe.allocateInstance in a simple
AppEngine app - it fails with an Exception similar to the above:

Unsafe.allocateInstance(TestAllocateInstance.class):
java.lang.NoClassDefFoundError: sun.misc.Unsafe is a restricted class.

Please see the Google App Engine developer's guide for more details.
at

com.google.apphosting.runtime.security.shared.stub.sun.misc.Unsafe.<clinit>(Unsafe.java)


I also tried the ObjectStreamClass.newInstance() method that Objenesis can
use; this fails when tweaking the accessibility of the method:

java.lang.SecurityException: java.lang.IllegalAccessException: Reflection
is not allowed on java.lang.Object java.io.ObjectStreamClass.newInstance()
throws
java.lang.InstantiationException,java.lang.reflect.InvocationTargetException,java.lang.UnsupportedOperationException
at
com.google.appengine.runtime.Request.process-4e7d974abb397f1b(Request.java)
at java.lang.reflect.Method.setAccessible(Method.java:135)

Interestingly, this latter approach works fine in the dev appserver but
fails when running in the production App Engine environment.

As I understand it, it'd probably be considered a failure of App Engine's
sandbox for these sorts of techniques to work.

[obje...@googlecode.com]

Comment #9 on issue 12 by thinlen2...@gmail.com: Objenesis can't work on

the Google Apps Engine
http://code.google.com/p/objenesis/issues/detail?id=12

reflections.0.9.9-RC1.jar (https://code.google.com/p/reflections/)
working well in my google app engine project.
But I don't use it directly, I don't know if it can replace
sun.reflect.ReflectionFactory.
Hope the jar have any help to the issue.

[obje...@googlecode.com]

Updates:
Labels: -Milestone-2.0

Comment #10 on issue 12 by henri.tr...@gmail.com: Objenesis can't work on

the Google Apps Engine
http://code.google.com/p/objenesis/issues/detail?id=12

(No comment was entered for this change.)