New MagicInstantiator using MagicAccessorImpl

[henri-tremblay]

New issue created from issue #23 comment #23 (comment)

Synthesize the ObjectInstantiator instance, so it does what you attempted (manually invoking the desired constructor), and having it extend sun.reflect.MagicAccessorImpl, as its subclasses are not subject to the regular bytecode verification, and allow you to do it without globally disabling the verifier.

MagicAccessorImpl is package scope, however, its 'no verifier' property means you can create subclasses outside of the package.

You can find the prototype here. The interesting part is in the MagicInstantiatorStrategy class.

I am using ASM to generate the ObjectInstantiator instance. This is a relatively performance-heavy operation, but seeing as instantiator instances are cached by default, this should provide performance similar to the other instantiators.

[henri-tremblay]

It's working perfectly. Sadly, MagicAccessorImpl isn't present on Google App Engine so this instantiator doesn't work either

[jcarvalho]

Perhaps there is another GAE-specific class that will trigger the same behavior?

I'm not sure if the code for the JVM running on GAE is open-source, if it is, it may not be so hard to find.

[henri-tremblay]

From as far as I know, it's not available. We will need to have help from Google to find a solution.

[henri-tremblay]

The magic instantiator is now merge into objenesis

[henri-tremblay]

@jcarvalho BTW, I don't know if you had a look at the final version. Instead of having a special strategy, I'm using delegation in the instantiator to create the magic one