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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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Rebase method intercept, completely overriding method

I'm trying to do some runtime code changing using ByteBuddy. The problem that I've run into is that when I try to rebase a method to add an intercept call at the end, the entire method gets replaced and there isn't any $original() method declared…
Redrield
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Undefined Method for the type AgentBuilder.Default ByteBuddy

The method rebase(( type) -> {}) is undefined for the type AgentBuilder.Default public static void premain(String arg, Instrumentation inst){ new AgentBuilder.Default() .rebase(type ->…
codejava
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Call superclass method from interceptor bytebuddy

We have an obfuscated class that we need to enhance with bytebuddy. We basically need to redefine one method. Subclassing seemed to not have worked (the code is not executed). Rebasing works but in our intercepted method we need to call the…
kosta5
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Byte Buddy Advice.OnMethodExit: constructor retransformation

I'm trying to create Java Agent that will intercept FileInputStream/FileOutputStream constructors: import java.io.*; import java.lang.instrument.Instrumentation; import java.util.Arrays; import java.util.List; import java.util.jar.JarEntry; import…
user612696
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How to Dynamically Extend Concrete Classes with ByteBuddy

I've been playing with the ByteBuddy library for a while and I find myself stuck. I had this method working when the tested classes were within the same file (as static inner classes), but now that I've separated the logic into a separate file, it's…
A Frayed Knot
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Jenkins build job using 100% CPU on executors

For a while now, we are seeing our Jenkins machines being pegged at 100% CPU (or 200% or 400%, depending on the number of cores) according to top: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 23376…
raner
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Prints all submethod calls and arguments in a particular function

I am trying to follow through example but not able to find a tangible one to help me understand how to trace all method calls and it's arguments within a particular method (based on elementMatcher) The method I'd like to trace is getCustomer and…
user2780187
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Multiple method interception and interceptor reuse

Here's my use case: I have a class that has multiple methods that I want to intercept, but I don't want to intercept all methods of this class. I want to use different instances of the same interceptor class to accomplish this. When I try to do…
rekgm_chan
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Prtining method arguments using byte buddy API

I am working on a project where I need access method arguments during execution. Is it possible to print method arguments using byte buddy framework? any sample code on this using javaagent is highly appreciated.
ravi k
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Dynamically generate a single function (without subfunctions), representing a binary expression tree, at run time with Byte Buddy

Introduction I want to compare some libraries for generating code at run time. At the moment I touched the surface of Javassist and Byte Buddy. As a proof of concept I am trying to solve a small problem, which is a starting point for a more complex…
Skasselbard
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Class Redefine not working

SO I am trying to redefine a class. I have a class named folder. In OSGi (using Felix) I have a new Folder class with the same methods but some additional logging. I am trying to take the Folder Class from Felix and redefine the main Folder class…
Jason Tesser
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How to match a class with annotation inside?

I have an annotation named Metric @Target({ElementType.FIELD, ElementType.METHOD}) public @interface Metric { String name() default ""; } I want to weave some logic when some methods with the @Metric annotation, like: public class…
Sartner
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Can I match class that implements annotated Interface with knowledge only about annotation type?

just like in the topic. I have my resource class : public class HelloWorldEndpoint implements IRest { public String sayHello() { return "Hello world!"; } } And Interface : @Path("/helloworld") public interface IRest { @GET …
Macko
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ByteBuddy: Pass field of object to method

I'm using ByteBuddy and I'm trying to implement the equivalent of: void foo(A a, B b) { b.method(a.field) } I can do: void foo(A a, B b) { b.method(a) } by code like: java.lang.reflect.Method method = B.class.getMethod("method",…
Tom Quarendon
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How to validate and write test cases to check ASM/Byte Buddy instances were created in runtime

I have code written in ASM and Byte Buddy and I need to write test cases to ensure that these instances were indeed created in runtime. Any ideas about how should one go about it?
Caffeinated Coder
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