byte-buddy

问题 So I have a class Foo that should eventually adjust and reload classes. It has a method for that, too: private void redefineClass(String classname, byte[] bytecode) { ClassFileLocator cfl = ClassFileLocator.Simple.of(classname,bytecode); Class clazz; try{ clazz = Class.forName(classname); }catch(ClassNotFoundException e){ throw new RuntimeException(e); } Debug._print("REDEFINING %s",clazz.getName()); new ByteBuddy() .redefine(clazz,cfl) .make() .load(clazz.getClassLoader(),

问题 I'm currently migrating an old tool for Hibernate to automate prefetching based on entity statistics. The old tool used Hibernate 3.1, so there's some job to be done. Traditionally, Hibernate used CGlib proxies, but as I'm developing for the latest release of Hibernate I am changing the proxy generation to ByteBuddy. However, since the change to ByteBuddy I've been having some problems with getting the MethodHandler to work. The methodhandler in my tool is supposed to handle all the calls to

问题 I try to instrument a java class called ThreadPoolExecutor and i want to get details of threads using slf4j loggers and I am getting following error Exception in thread "pool-2-thread-2" Exception in thread "pool-2-thread-1" java.lang.NoClassDefFoundError: com/github/shehanperera/threadagent/MonitorInterceptor at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java) at java.lang.Thread.run(Thread.java:748)java.lang.NoClassDefFoundError: com/github/shehanperera

问题 I'm trying to generate runtime wrappers around classes in some class graph, but I don't know how to handle the situation when there is a cycle in the graph. Imagine there's a class A that has a field of type B, but type B has a field of type A. I want to generate classes A' and B' so that class A' has a field of type B' and B' has a field of type A'. In Byte Buddy the method "defineField" can receive a parameter of type TypeDefinition. I think there must be a way to define TypeDefinition for

问题 I use ByteBuddy in an Agent to add a tracking variable to each Runnable in a test program: new AgentBuilder.Default() .with(AgentBuilder.LambdaInstrumentationStrategy.ENABLED) .type(ElementMatchers.isSubTypeOf(Runnable.class) .and(ElementMatchers.not(ElementMatchers.isInterface()))) .and(ElementMatchers.not(ElementMatchers.isAbstract())) .transform((builder, typeDescription, classLoader, module) -> builder .defineField("foo", String.class) .constructor(ElementMatchers.any()) .intercept(Advice

问题 I am using byte-buddy to build an ORM on top of Ignite, we need to add a field to a class and then access it in a method interceptor.. So here's an example where I add a field to a class final ByteBuddy buddy = new ByteBuddy(); final Class<? extends TestDataEnh> clz = buddy.subclass(TestDataEnh.class) .defineField("stringVal",String.class) .method(named("setFieldVal")).intercept( MethodDelegation.to(new SetterInterceptor()) ) .make() .load(getClass().getClassLoader(), ClassLoadingStrategy

问题 I want to wrap simple POJO class. The thing is I know nothing about that class beforehand, only that it's POJO with setters and getters. I want to substitute this class with my Proxyclass so that every time client calls getter or setter I would be able to intercept that call. So when the call is intercepted, I want to do some pre-get(or set) operation, then invoke the getter(or setter), and then to do some post-get(or set) operations. I'm creating my proxy like that private Pojo

问题 I'm trying to intercept constructor calls with Byte Buddy, this is my sample code: package t; import static net.bytebuddy.dynamic.loading.ClassLoadingStrategy.Default.INJECTION; import static net.bytebuddy.implementation.MethodDelegation.to; import static net.bytebuddy.matcher.ElementMatchers.any; import java.util.concurrent.Callable; import net.bytebuddy.ByteBuddy; import net.bytebuddy.implementation.bind.annotation.RuntimeType; import net.bytebuddy.implementation.bind.annotation.SuperCall;

问题 I'm trying to redefine classes on the java.lang package such as String.class or Integer.class using ByteBuddy but with no success. My question is if that's even possible? This is the code I'm trying in my java agent: public static void premain(String agentArgs, Instrumentation inst) { new AgentBuilder.Default() .type(named("java.lang.String")) .transform((builder, typeDescription, classLoader) -> builder.method(named("toString")) .intercept(FixedValue.value("toString() got hacked!"))) .with

问题 I'm having difficulty understanding the documentation for Byte Buddy. To help me learn the API I would like to generate the byte code equivalent of this Java: public final class GeneratedByByteBuddy { private final int a; public GeneratedByByteBuddy(final int a) { this.a = a; } } I've had difficulty working out the right way to use Instrumentation to create the field assignment. 回答1: You are creating a class with customized byte code. For this, you cannot use a built-in Instrumentation but