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Javassit for Android

Java 99.95% HTML 0.05%

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javassist-android's Issues

insertBefore, insertAfter into Android framework methods?

Is it possible to insertBefore/insertAfter a small portion of code into any method inside Android framework, and apply the change at runtime? Say, android.widget.TextView.setText().

I have tried it with CodeConverter with HotSwapper but with no luck. As I know the framework classes are all forked from Zygote in Android which is very different from traditional Java.

What is the status of this project ?

Hi @crimsonwoods ,

I am interested in this project, and I would like to know how mature it is. Is it production ready ? Are there a lot of things still to be done ?

Btw, can you explain in a few words, the problem of javassist on Android, what works and what doesn't ?

Thanks for your work,
Stéphane

javassist-android-master;makeClass() method throw EOFException

Hi @crimsonwoods
i'm using javassist-android-master for my project,but when i use "makeClass(inputstream classfile) " (the .class file is in SDCard), javassist throw a EOFException:

java.io.EOFException
at libcore.io.Streams.readFully(Streams.java:83)
at java.io.DataInputStream.readInt(DataInputStream.java:124)
at javassist.bytecode.ClassFile.read(ClassFile.java:767)
at javassist.bytecode.ClassFile.(ClassFile.java:114)
at javassist.CtClassType.(CtClassType.java:94)
at javassist.ClassPool.makeClass(ClassPool.java:748)
at javassist.ClassPool.makeClass(ClassPool.java:726)
at org.jamruby.javassistsample.MainActivity.onCreate(MainActivity.java:66)
at android.app.Activity.performCreate(Activity.java:5104)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2258)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2354)
at android.app.ActivityThread.access$600(ActivityThread.java:150)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1244)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5191)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
at dalvik.system.NativeStart.main(Native Method)

how to fix it? thx!

toClass() method throws CannotCompileException

I am using this library to generate dynamic classes at run-time.
It was helpful until I stuck up here. In the sample I see

cls.writeFile(getFilesDir().getAbsolutePath());

class is written to a file. I just need to generate a class that the toClass() method of the library does.
This is what I need.

 Class c;
 c = ctClass.toClass();
 Object object = c.newInstance();

But when I run this code, the 2nd line throws a CannotCompileException with the following stack trace:

01-24 12:42:27.762 24214-24214/com.android.princebansal.kvadmin W/System.err: javassist.CannotCompileException: by java.lang.UnsupportedOperationException: can't load this type of class file
01-24 12:42:27.764 24214-24214/com.android.princebansal.kvadmin W/System.err:     at javassist.ClassPool.toClass(ClassPool.java:1123)
01-24 12:42:27.764 24214-24214/com.android.princebansal.kvadmin W/System.err:     at javassist.ClassPool.toClass(ClassPool.java:1066)
01-24 12:42:27.764 24214-24214/com.android.princebansal.kvadmin W/System.err:     at javassist.ClassPool.toClass(ClassPool.java:1024)
01-24 12:42:27.764 24214-24214/com.android.princebansal.kvadmin W/System.err:     at javassist.CtClass.toClass(CtClass.java:1141)
01-24 12:42:27.764 24214-24214/com.android.princebansal.kvadmin W/System.err:     at com.android.princebansal.kvadmin.Entity.Main.Activities.MainActivity.construct2(MainActivity.java:189)
01-24 12:42:27.764 24214-24214/com.android.princebansal.kvadmin W/System.err:     at com.android.princebansal.kvadmin.Entity.Main.Activities.MainActivity.construct2(MainActivity.java:171)
01-24 12:42:27.764 24214-24214/com.android.princebansal.kvadmin W/System.err:     at com.android.princebansal.kvadmin.Entity.Main.Activities.MainActivity.construct2(MainActivity.java:171)
01-24 12:42:27.764 24214-24214/com.android.princebansal.kvadmin W/System.err:     at com.android.princebansal.kvadmin.Entity.Main.Activities.MainActivity.construct2(MainActivity.java:171)
01-24 12:42:27.764 24214-24214/com.android.princebansal.kvadmin W/System.err:     at com.android.princebansal.kvadmin.Entity.Main.Activities.MainActivity.construct2(MainActivity.java:171)
01-24 12:42:27.765 24214-24214/com.android.princebansal.kvadmin W/System.err:     at com.android.princebansal.kvadmin.Entity.Main.Activities.MainActivity.generateVxml(MainActivity.java:122)
01-24 12:42:27.765 24214-24214/com.android.princebansal.kvadmin W/System.err:     at com.android.princebansal.kvadmin.Entity.Main.Activities.MainActivity.onOptionsItemSelected(MainActivity.java:102)
01-24 12:42:27.765 24214-24214/com.android.princebansal.kvadmin W/System.err:     at android.app.Activity.onMenuItemSelected(Activity.java:2955)
01-24 12:42:27.765 24214-24214/com.android.princebansal.kvadmin W/System.err:     at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:408)
01-24 12:42:27.765 24214-24214/com.android.princebansal.kvadmin W/System.err:     at android.support.v7.app.AppCompatActivity.onMenuItemSelected(AppCompatActivity.java:198)
01-24 12:42:27.765 24214-24214/com.android.princebansal.kvadmin W/System.err:     at android.support.v7.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:113)
01-24 12:42:27.765 24214-24214/com.android.princebansal.kvadmin W/System.err:     at android.support.v7.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:113)
01-24 12:42:27.765 24214-24214/com.android.princebansal.kvadmin W/System.err:     at android.support.v7.app.ToolbarActionBar$2.onMenuItemClick(ToolbarActionBar.java:69)
01-24 12:42:27.765 24214-24214/com.android.princebansal.kvadmin W/System.err:     at android.support.v7.widget.Toolbar$1.onMenuItemClick(Toolbar.java:206)
01-24 12:42:27.765 24214-24214/com.android.princebansal.kvadmin W/System.err:     at android.support.v7.widget.ActionMenuView$MenuBuilderCallback.onMenuItemSelected(ActionMenuView.java:776)
01-24 12:42:27.765 24214-24214/com.android.princebansal.kvadmin W/System.err:     at android.support.v7.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:822)
01-24 12:42:27.765 24214-24214/com.android.princebansal.kvadmin W/System.err:     at android.support.v7.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:156)
01-24 12:42:27.765 24214-24214/com.android.princebansal.kvadmin W/System.err:     at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:969)
01-24 12:42:27.765 24214-24214/com.android.princebansal.kvadmin W/System.err:     at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:959)
01-24 12:42:27.765 24214-24214/com.android.princebansal.kvadmin W/System.err:     at android.support.v7.widget.ActionMenuView.invokeItem(ActionMenuView.java:623)
01-24 12:42:27.765 24214-24214/com.android.princebansal.kvadmin W/System.err:     at android.support.v7.view.menu.ActionMenuItemView.onClick(ActionMenuItemView.java:154)
01-24 12:42:27.766 24214-24214/com.android.princebansal.kvadmin W/System.err:     at android.view.View.performClick(View.java:5268)
01-24 12:42:27.766 24214-24214/com.android.princebansal.kvadmin W/System.err:     at android.view.View$PerformClick.run(View.java:21550)
01-24 12:42:27.766 24214-24214/com.android.princebansal.kvadmin W/System.err:     at android.os.Handler.handleCallback(Handler.java:822)
01-24 12:42:27.766 24214-24214/com.android.princebansal.kvadmin W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:104)
01-24 12:42:27.766 24214-24214/com.android.princebansal.kvadmin W/System.err:     at android.os.Looper.loop(Looper.java:207)
01-24 12:42:27.766 24214-24214/com.android.princebansal.kvadmin W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:5774)
01-24 12:42:27.766 24214-24214/com.android.princebansal.kvadmin W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
01-24 12:42:27.766 24214-24214/com.android.princebansal.kvadmin W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
01-24 12:42:27.766 24214-24214/com.android.princebansal.kvadmin W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:681)
01-24 12:42:27.766 24214-24214/com.android.princebansal.kvadmin W/System.err: Caused by: java.lang.UnsupportedOperationException: can't load this type of class file
01-24 12:42:27.768 24214-24214/com.android.princebansal.kvadmin W/System.err:     at java.lang.ClassLoader.defineClass(ClassLoader.java:265)
01-24 12:42:27.768 24214-24214/com.android.princebansal.kvadmin W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
01-24 12:42:27.768 24214-24214/com.android.princebansal.kvadmin W/System.err:     at javassist.ClassPool.toClass2(ClassPool.java:1136)
01-24 12:42:27.768 24214-24214/com.android.princebansal.kvadmin W/System.err:     at javassist.ClassPool.toClass(ClassPool.java:1117)
01-24 12:42:27.768 24214-24214/com.android.princebansal.kvadmin W/System.err: 	... 33 more

Please help me out.

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