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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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Match class that implements inteface and method with specified return type

I wonder if it is possible to write byte-buddy java-agent which will find in project classes that implement specified interface, and match, in those classes, methods that return also specified type ?
Macko
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Can I redefine a private method from a parent class using Byte Buddy?

Based on the idea of Can I redefine private methods using Byte Buddy?, I would like to redefine a private method from a parent class. Is that possible? Or it's like the chicken and egg problem ? Thanks!
Jordi Llach
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Autogenerating field methods

I am interested in auto generating some boiler plate methods (similar to Project Lombok). Byte Buddy friendly API seems promising but I'm not sure how to go about using it. Here is a simple use-case. Lets say I have a class User.java public class…
jaypal singh
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Error in implementation with interface

I'm sorry for my English, I'm having trouble with an implementation. I have an abstract class with only one method that implements an interface package br.com.teste; public abstract class Test implements IDefault { @Override public…
user1437601
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Is MethodDelegation intercept with ByteBuddy possible on Android?

is it possible to replace a method of a class with ByteBuddy in Android? public class DoSomething { public void saySomething() { Log.d("DoSomething", "Hello World"); } } public class ModifiedDoSomething { public void…
Phoebus
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MethodDelegation with Passing Object Array to Specific Parameters Using ByteBuddy

interface Foo{ Object foo(Object... args); } static class FooAdapter{ Object foo2(String msg, Integer age) { System.out.println(msg+"=>"+age); return age; } } public static void main(String[] args) throws Exception{ …
BilboDai
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How can I create a proxy when the class having only one private constructor?

Using ByteBuddy, I'd like to create a proxy for a class which has a private constructor. That's the class: public class Foo { private Foo() { } } I tried write some code like this but not work? public class CreateAndExecuteProxy { …
patrick.ym
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Replace type occurrences in bytecode with ByteBuddy

Is it possible with ByteBuddy to replace occurences of some type in bytecode? E. g. if I have a class class MyClass { Foo makeFoo() { return new Foo(); } } I want to transform bytecode of this class so that it is equivalent to class…
leventov
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How to count local variable indexes in MethodVariableAccess?

According to [1], in a method frame, the local variable array contains a reference to the called instance, the parameters and, finally, any other variables used in the method's code. Also, long and double values occupies two local variables. When…
Carlos Melo
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How can I use bytebuddy to generate pojo code

I'm new to bytebuddy, and I've written a junit test to generate a class file. Blow is my code: @Test public void testGener() throws IOException { DynamicType type = new ByteBuddy().subclass(Object.class).name("TestInterFace").defineField("test",…
zhouxiang
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Define Enum at Runtime using ByteBuddy

I have a project which uses an enum to be used as a parameter for a class which signature is like this: public class MyClass> extends ExtendedClass The thing is, I don't want to define an enum and do the same programming again…
CiCi
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Byte buddy instrumentation causes an exception: java.lang.IllegalStateException: Unexpected remainder on the operand stack: -1

Related to the issue discussed here I get the following exception: [Byte Buddy] ERROR com.panaya.as.web.util.WebAnalyticsUtils$AnalyticsData[WebappClassLoader context: delegate: false repositories: ----------> Parent…
esaar
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Subclassing a Class using ByteBuddy results in a class without any declared methods

I'm missing something obvious here, but I don't see the declared methods when I subclass a Class using ByteBuddy. Object.class.getDeclaredMethods() result: [protected void java.lang.Object.finalize() throws java.lang.Throwable, public final void…
Alex Okrushko
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How to convert dynamically input user expression to java code?

I read the byte buddy and javassist doc and I would like do not know if is possible to convert a string like: get foos where name == toto to data.getFoos().stream() .filter( f -> f.name.equals( "toto" ) ) .collect(…
bioinfornatics
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Agent to count objects inside methods using ByteBuddy

I'm looking for a way of count how many different objects are being called inside a method using ByteBuddy for byte code analysis. I tried this with string parsing, but that's absolutely impossible. Also, I've checked about AST, but I should build…
Sergio Figueras
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