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Questions tagged [byte-buddy]

Byte Buddy is a code generation and manipulation library for creating and modifying Java classes during the runtime of a Java application and without the help of a compiler. Byte Buddy allows the creation of arbitrary classes and is not limited to implementing interfaces for the creation of runtime proxies. Furthermore, Byte Buddy offers a convenient API for changing classes either manually, using a Java agent or during a build.

Byte Buddy is a code generation and manipulation library for creating and modifiying Java classes during the runtime of a Java application and without the help of a compiler. Other than the code generation utilities that ship with the Java Class Library, Byte Buddy allows the creation of arbitrary classes and is not limited to implementing interfaces for the creation of runtime proxies. Furthermore, Byte Buddy offers a convenient API for changing classes either manually, using a Java agent or during a build.

In order to use Byte Buddy, one does not require an understanding of Java byte code or the class file format. In contrast, Byte Buddy's API aims for code that is concise and easy to understand for everybody. Nevertheless, Byte Buddy remains fully customizable down to the possibility of defining custom byte code. Furthermore, the API was designed to be as non-intrusive as possible and as a result, Byte Buddy does not leave any trace in the classes that were created by it. For this reason, the generated classes can exist without requiring Byte Buddy on the class path. Because of this feature, Byte Buddy's mascot was chosen to be a ghost.

Byte Buddy is written in Java 6 but supports the generation of classes for any Java version. Byte Buddy is a light-weight library and only depends on the visitor API of the Java byte code parser library ASM which does itself not require any further dependencies.

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Bytebuddy constructor advice throws java.lang.VerifyError

Basically, I want to intercept all classes that have a specific annotation (that was created by me) and i want to perform my custom logic in method and constructor entry. I have tried using byte-buddy agent builder as you can see from my code…
osmanates
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Exception arised when I create custom constructor in ByteBuddy generated class

I use ByteBuddy to implement a wrapper class to provide existing domain objects with indexes. public interface Indexed { Long getIndex(); } Here are my domain classes. public interface Alpha { String getName(); Long…
Anton Kudruk
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How to use ByteBuddy delegation for intercepting bootstrap class method

I'm using java agent and bytebuddy to intercept the "read" and "write" methods in FileIOStreams. A feature to implement is "to call the original methods under certain circumstances, else pass". Due to this, I need to have full control of the…
Yuming Shi
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How to use bytebuddy to intercept a "synchronized" code block in Java?

There is a synchronized code block shown as below: public class Counter { int count; public void increment(){ synchronized(this){ this.count ++; } } } I know how to use bytebuddy to intercept the instrument method. Can…
Jeffrey W.
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Byte Buddy: Convert an object of a class from one class loader to same class loaded in another class loader

I'm exploring if Byte Buddy is the right tool for me to use. I was looking at this answer which talks about how with Byte Buddy, one can take a class Foo loaded with class loader A, rename it to Bar and redefine it on another class loader B. That's…
siddhant3s
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Byte Buddy class is loaded but cannot be accessed using ClassLoader.load

I have created a new class with the following code: //...name and fields etc .make() .load(NetworkClassManager.class.getClassLoader()) .getLoaded(); Which has created my class called TestNetwork_ND, but when I try access it…
Shaun Wild
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fails to instrument threadPoolExecutor by bytebuddy

I encounter the same problem with this post. https://stackoverflow.com/questions/49321938/instrument-in-java-level-using-byte-buddy/55032131#55032131 when I use the code instrument threadpoolexecutor, new AgentBuilder.Default() …
zheyi yi
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Spring HTTP invoker with Service Discovery

Is there any framework available to use service discovery with spring HTTP invoker over rmi. ? Like Netflix euraka server or something like that.
user1472185
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Use ByteBuddy to change package of annotated class in Spring app

I want to change the package of classes that have been annotated with a particular annotation. I want to do this so that they can't be picked up by Jersey. I'm wondering if this is achievable within a Spring (Boot) application. If so, where is the…
Matt Berteaux
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Spring boot: Rebuild EntityManagerfactory at Runtime

I'm trying to build a multi-tenant object management platform for an ERP system in which entities are specific to each tenants. I'm generating entities at runtime using bytebuddy once after I load them to the class path, I need to rebuild the emf at…
BeingVikram
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How to get the value from each field of a class with Byte Buddy?

I'm writing a library that uses Java Agents with Byte Buddy to perform runtime code generation. I need to create an expression to get the value from each field of a class. How can I create an expression to access the field value? Currently I'm…
Wellington Costa
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ByteBuddy java agent requires application dependency which is increasing agent jar size

I am a writting a java agent using byte buddy, it works great, I am using lot of @Advice.OnMethodEnter annotations to add code to an existing class. I have the following concern: I am adding lot of application/3rd party dependency to the…
Vikrant Sonone
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How can I generate method with byte buddy?

This is a followup question of How can I get Annotation class from TypeDescription I'm trying to generate methods using Plugin. With given class such as. class { @Func T some; } I located the field with specific annotation. And I'm asking…
Jin Kwon
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How can I get Annotation class from TypeDescription

I'm trying to work with ByteBuddy. How, with given TypeDescription, can I get annotation class? So far I found getActualName. @Override public boolean matches(final TypeDescription target) { //System.out.printf("matches(%1$s)\n", target); …
Jin Kwon
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Bytebuddy: apply a transform on an iterface based on name rather than class

I want to apply a transform on classes implementing a certain interface, but due to class loading issues I want to do it by name and not by providing the class. Is there a way to do that? What I mean is that instead of: new AgentBuilder.Default() …
Amirrrrr
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