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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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Package name is corrupted while copying the class

I defined Point class like below. package com.sample.app.model; public class Point { public int x; public int y; } When I try to construct other class with Point class data, I seen package name is corrupted. CtClass pointClass =…
Hari Krishna
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Javassist ; Caused by: compile error: no such class: logger

I am trying to instrument one of my class and it works fine if I added System.out.println(somevariable) but it throws Caused by: compile error: no such class: logger when adding logger.debug(somevariable); Here is the code with logger: public…
NaiveCoder
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Java - Modify toString() of Object class in JVM

In JVM, I want to change the behaviour of toString method of Object class to return getClass().getName(); instead of getClass().getName() + "@" + Integer.toHexString(hashCode()); I tried Javassist's Hotswapper, but it requires a debug port to be…
Manikchand Parthiban
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where does exactly Hibernate uses HttpURLConnection

I have been searching everywhere, but could not find where exactly hibernate uses HttpURLConnection. Theoretically I think it uses for its back end connectivity. My issue is I have a java agent which instruments HttpURLConnection to set a header…
s s
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Javassist "syntax error" on valid method

Javassist gives me this error: Caused by: javassist.compiler.SyntaxError: syntax error near "oolean do() { Obje" at javassist.compiler.Parser.parseMember1(Parser.java:55) ~[?:?] at javassist.compiler.Javac.compile(Javac.java:90)…
inventivetalent
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cglib vs javaassit vs java refelection

I heard that cglib takes less time as compare to java reflection for runtime object creation but when I checked, it is taking 100 times more time than java reflection. Following is the result of my research Creating 10000 objects CGLIB:191…
zubair
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A java Agent to inspect all JVM running classes?

I am trying do an academic project on BCI and JavaAssist. I would be glad if anyone could help me with these: Is it possible to build a java agent which can inspect/control all classes running currently in the JVM? Is it possible to build a java…
Ram Inamdar
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Java Write Log to Text

Currently I'm instrumenting methods with loggers to trace some information but I have problem extracting the log output into the text file. What I am doing is instrumenting every single method with logger.info but it doesn't work when you want to…
James Riden
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Javassist constant pool

Question 1: How would I change the signatures of entries within the ConstPool? For example, lets say I had a methodref to a method with a signature "()Ljava.util.Collection;". How can I change that to say, "()I"? I want to do this because when a…
user2982130
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Opcode for identifying switch case in javassist

How to find the op-code for identifying switch case in a java class using javassist or asm. I used the Below Snippet List methods = lClassFile.getMethods(); for (Object m : methods) { MethodInfo lMethodInfo = (MethodInfo) m; …
Prabhu Prabhakaran
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How to print no methods Found if none is found

i have this code i need to print no methods found if no methods are found how to do it. public class MethodFinder { public static void main(String[] args) throws Throwable { ClassPool cp = ClassPool.getDefault(); CtClass ctClass =…
Kandekumbura
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