java-bytecode-asm

问题 I searched on Google how to generate subclass by asm, there seem to be few people who are concerned about this issue. Is this demand itself not suitable? Perhaps the most common thing that asm does is to add extra code before and after the method by AdviceAdapter . I think that generating a subclass is also a very common requirement.In fact, it is not easy to do this. How to make all public or protected methods automatically override the parent class's methods, just like HttpServletRequest '

问题 For a method: String invoke(Object... args) When I use asm ClassVisitor to read this method, I see: ([Ljava/lang/Object;)Ljava/lang/String; Yes the parameter args become a object array, as it is to say: variable parameter is a syntactic sugar of array. But when I use javap to show the bytecode: public java.lang.String invoke(java.lang.Object...); I'm confused why javap know the args is variable Object..., not array type Object[] 来源： https://stackoverflow.com/questions/61672612/with-asm-how-to

问题 I'm currently implementing some code that should, for each method of a class, run a couple of visitors on a .class file, as to instrument its bytecode. At the moment, I've just implemented a MethodRenamerVisitor, but this is already getting quite awkward: ClassReader classReader = null; try { classReader = new ClassReader(monitoringFile.getCannonicalName()); } catch (IOException e1) { e1.printStackTrace(); } ClassWriter classWriter = null; for (BytecodeMethod bytecodeMethod : bytecodeClass

问题 I would like to add field along with its getter/setter in compiled Java classes which is loaded in a Spring boot application. I was able to modify the class using JavaAssist and ASM. But the problem is it is not letting me reload the class after modification, since this is already been loaded. I tried to write a class extending java.lang.ClassLoader but custom classloader is not getting called. Also, I checked java's Instrumentation API which clearly states The retransformation may change

问题 I would like to add field along with its getter/setter in compiled Java classes which is loaded in a Spring boot application. I was able to modify the class using JavaAssist and ASM. But the problem is it is not letting me reload the class after modification, since this is already been loaded. I tried to write a class extending java.lang.ClassLoader but custom classloader is not getting called. Also, I checked java's Instrumentation API which clearly states The retransformation may change

问题 I cannot load a class after byte code modification with ASM library. Here it is identity transformer and I expect to get modified array with the same size as bytes one, but it 2 times shorter! (439 vs 278) String path = SimpleClass.class.getName().replace(".", "/") + ".class"; ClassLoader classLoader = SimpleClass.class.getClassLoader(); InputStream is = classLoader.getResourceAsStream(path); byte[] bytes = IOUtils.toByteArray(is); ClassReader reader = new ClassReader(bytes); ClassWriter

问题 Hi. I want to find the range of instructions between the start and the end of a method-call. I do not want to simply just change the method-call owner/name/desc. With the expected result, I want to be able to do: Completely remove a method call Modify the method call by adding new arguments either in-front or after I've been trying different techniques to achieve this: ASM Analyzer (using SourceInterpreter) Looping the instruction set, forward and reversed, to try and locate the start and end

问题 I want the modulated ASM class to be applied when calling newTarget.a () and newTarget.b () in the code below so that it looks like this How can I get the following result when I call newTarget.a () and newTarget.b () with Modified ASM Class applied? Code: package asm; import org.objectweb.asm.ClassReader; import org.objectweb.asm.ClassVisitor; import org.objectweb.asm.ClassWriter; import org.objectweb.asm.MethodVisitor; import org.objectweb.asm.Opcodes; import static org.objectweb.asm

问题 I'm trying to log every call, returned objects and exceptions thrown in methods and constructors using a ByteBuddy (v1.7.9) java agent, without iterfering with the normal functioning of the instrumented code. My current instantiation of the agent is new AgentBuilder.Default() .with(AgentBuilder.Listener.StreamWriting.toSystemOut()) .type((typeDescription, classLoader, module, classBeingRedefined, protectionDomain) -> matcher.matchesIncoming(typeDescription.getTypeName())) .transform((builder,

问题 I am getting following exception: java.lang.UnsupportedClassVersionError: net/sourceforge/barbecue/BarcodeException : **Unsupported major.minor version 0.0** at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:621) at java.lang.ClassLoader.defineClass(ClassLoader.java:466) at pl.wroc.pwr.judy2.master.TestClassLoader.loadClass(TestClassLoader.java:51) at java.lang.ClassLoader.loadClass(ClassLoader.java:252) at java.lang.ClassLoader