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Questions tagged [javassist]

Javassist is a class library for editing bytecode in java.

Javassist is one of several tools that exist for manipulation of Java Bytecode but, it includes a simple Java Compiler for processing source text. It receives source text written in Java and compiles it into Java bytecode, which will be inlined into a method body.

This feature allows first comers to start modifying class' bytecode to some extent without deep knowledge regarding the class format or actual bytecode instruction set and OP Codes.

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Java Newbie: How to use Java Agent From the Command Line for Instrumentation

I am attempting to load a java agent to use java.lang.instrument.Instrumentation to measure the size of an object. Here is my Java: package com.example.memory.usage; import java.lang.instrument.Instrumentation; import java.util.*; public class…
David Williams
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Create Pojo at runtime and save it on Disk?

With reference to the following link, I have created the classes at run time, http://blog.javaforge.net/post/31913732423/howto-create-java-pojo-at-runtime-with-javassist. Now I need to view the created class that means Where will it create the class…
Vinod
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Is it possible to modify the android button with javassist

I want to append some mark When the developer calls some method, like preformClick, but I get a exception:javassist.NotFoundException: C:\Users\xyz\AppData\Local\Android\android-sdk\platforms\android-21\android.jar. Here is my code, I use…
Xu Neal
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Javassist overwriting existing annotations

Already existed annotations present at the top of class are removing and whatever i added using Javassist are adding but not taking any effect. suppose @Entity class Master { //variables //getters and setters } What i need is to…
CaliCo
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JVM crashes with EXCEPTION_ACCESS_VIOLATION when using Instrumentation API

I am trying to use a ClassFileTransformer with the Instrumentation API. However, my JVM crashes before my premain method finishes. I am using javassist to manipulate the byte-code of loaded classes. My ClassFileTransformer looks like this: import…
user2188613
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Hibernate JPA conflict in Grails 2.4.4

I've been upgrading a Grails 1.3.7 application to 2.4.4, using Hibernate 3 due to Spring Security being incompatible with the hibernate4 plugin, and have run into issues with this kind of stacktrace at runtime: java.lang.ClassCastException:…
DavidN
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Error generating java method using javaassist

I am having some trouble with javaassist. I'm attempting to generate a class on the fly and I'm getting an error that says: no such class: Foo during the compilation step in the generateFooMethod step below. Can anyone help me? try { …
Amir Afghani
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Parse classes from jar using javassist

I'm noob in javassist. Anyone can give the sample how to load classes from jar and save them using javassist? jar = new JarFile(fileName); Enumeration entries = jar.entries(); while (entries.hasMoreElements()) { JarEntry jarEntry =…
MG_REX
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How to inspect runtime annotations with javassist

When attempting to inspect code at runtime using Javassist I need to look at the annotations. As a simple example: ClassPool pool = ClassPool.getDefault(); CtClass clazz = pool.getCtClass("org.junit.Test"); boolean found = false; for (Object…
user1995422
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Write java class object to java source file

I've created a pojo object in runtime using javassist. I want to write it to a java file. I don't want to write a lot of code for this job. Is there any utility for doing this? for example the output should be something like this…
Pooya
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Invoking injected method

Whenever I create a new method with Javassist using this method public static void addMethod(CtClass targetClass, String code) throws Exception { CtNewMethod.make(code, targetClass); targetClass.toClass(); logger.info("Method…
Aerrathas
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Make an object read only in Java

I have a cache with objects which were read from the database (regular beans). When I return them I want to make them read only so users of the cache can't damage the cache objects. I'm looking for an efficient way since objects can be requested…
Avner Levy
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"VerifyError: Expecting a stackmap frame" using Play Framework and Google App Engine

I have a Google App Engine webapp running with Play Framework 1.2.X. After Google changed their requirement to the webapp being built with Java 7 I have been struggling with a few different instances of VerifyError in the code. I've been able to…
Roy Solberg
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Can't apply event in an element created by innerHTML

Hello guys I'm having problem with my page at the moment. I have a function that will add row and cells in a table on every click of a button. CODE: