Enable subclassing of Java classes on Dalvik

JavaProxyClassFactory seems like where it happens.

One way to go would be to intercept the byte code array and convert it to Dalvik byte code before calling defineClass.

Can we use https://github.com/headius/dexclient/blob/master/src/DexClient.java for this?

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I started a branch for this: JRUBY-6883

I have something that I thought should work when run on Android, but it fails with

I/System.out(11535): Cause: java.lang.UnsupportedOperationException: can't load this type of class file

even after the JVM byte code should have been translated to Dalvik byte code.

Any help is greatly appreciated.

OK, looks like the DexClassloader does not override defineClass.

Trying with loadClass instead.

Feels like I am really close! I committed a change for JavaProxyClassFactory that converts the JVM byte code to Dalvik byte code, saves it to a JAR and tries to load it using the DexClassLoader. It fails with this error:

D/dalvikvm(26052): DexOpt: --- BEGIN 'ArrayAdapter$Proxy0.jar' (bootstrap=0) ---
W/dalvikvm(26071): Invalid file flags in class Lorg/jruby/proxy/android/widget/ArrayAdapter$Proxy0;: 0019
F/libc    (26071): Fatal signal 11 (SIGSEGV) at 0x00000004 (code=1)
...
W/dalvikvm(26052): DexOpt: --- END 'ArrayAdapter$Proxy0.jar' --- status=0x000b, process failed
E/dalvikvm(26052): Unable to extract+optimize DEX from '/data/data/org.ruboto.test_app/app_dex/org/jruby/proxy/android/widget/ArrayAdapter$Proxy0.jar'

I have no idea what file flags 0019 mean. Any help is appreciated.

Hi!

I changed the example to load the byte array generated by the HelloWorldASM class given in https://github.com/sciruela/android , and the class loads successfully with the code checked in on the JRUBY-6883 branch.

That leads me to think that the byte stream given by JRuby to load the class is missing something, but I have no idea what that would be.

Any ideas? It would just be AWESOME if we could get this to work.

GOT IT WORKING! We can now subclass ArrayAdapter directly without any magic!

The error is that JavaProxyClassFactory#beginProxyClass sets the ACC_STATIC flag which is invalid for a class file. Removing the flag fixed the problem.

Concept proven!

Enebo added a system property to set a custom proxy class factory which we set from Ruboto. It works nicely, and has very little impact on JRuby core.

Thanks!