Byte Buddy
Maker
Byte Buddy | Maker | |
---|---|---|
5 | 6 | |
6,017 | 47 | |
- | - | |
9.0 | 8.7 | |
5 days ago | 4 days ago | |
Java | Java | |
Apache License 2.0 | Apache License 2.0 |
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Byte Buddy
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Monkey-patching in Java
As seen above, the API exposes the user to low-level bytecode manipulation via byte arrays. It would be unwieldy to do it directly. Hence, real-life projects rely on bytecode manipulation libraries. ASM has been the traditional library for this, but it seems that Byte Buddy has superseded it. Note that Byte Buddy uses ASM but provides a higher-level abstraction.
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Any news on the Classfile API?
Just a drive-by comment: ByteBuddy is worth a look https://bytebuddy.net/. It is built on top of ASM.
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Proposed: A new CMake scripting language usable alongside existing one
> can you show an example of how you'd parse, say, a .java.in
The canonical way to do such a thing is through the java annotation processing api [1] and using a tool like java poet [2]. Before you did that, you'd probably decide if you wanted to instead use bytecode generation with a library like bytebuddy [3]
But, assuming for some reason, you wanted to torture yourself and actually consume a java.in file and apply a regex, then you'd probably pull out the "maven-replacer-plugin" [4] and configure that for the task at hand. (or use your favorite templating language plugin. There's a million of them).
Though, to be fair, this really isn't something that comes up in regular java programming due to the nature of the ecosystem. Anything you'd want to codegen likely already has a library and anything you didn't would receive (legitimate) push back.
[1] https://www.baeldung.com/java-annotation-processing-builder
[2] https://github.com/square/javapoet
[3] https://bytebuddy.net/
[4] https://github.com/beiliubei/maven-replacer-plugin
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is rust the only language to have procedural macros?
Have a look at byte buddy.
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Byte Buddy on Android made possible
If you've ever used libraries like https://github.com/JakeWharton/hugo or https://hibernate.org/ (if you've ever done some backend development) and wondered how do they seem to add some code/logic into your app just by adding some annotation to some method, or if you ever wondered how mocking frameworks like Mockito can change a class behavior for example, then most likely you're interested in a programming technique that allows to modify existing code, usually known as Aspect oriented programming (also known in Java as Bytecode instrumentation) which, even though it might sound intimidating at first, some really cool tools such as Byte Buddy or AspectJ make it quite easy to accomplish.
Maker
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Any news on the Classfile API?
If you want an alternative to ASM, try Cojen/Maker, which is designed to be much easier to use than any of the other class writing APIs, including the one proposed by JEP-8280389. Here's a comparison.
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Jdk.Classfile Javadoc (in-development)
That's a lot right arrow operators just to implement a simple Hello World program (5). I can't even begin to imagine how difficult it might be to generate anything more interesting than this. Here's a comparison against a classfile API which is designed to be easy to use: https://github.com/cojen/Maker/wiki/JEP-8280389
- JEP draft: Classfile API
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Show HN: I spent my vacation writing a modern JVM assembler
For the code generation phase, it might be easier to bypass emitting a text-based assembly format and just use the ASM library directly. If you want something easier, I wrote a code generation library specifically for that purpose: https://github.com/cojen/Maker It also includes an example "Mini-C" language compiler.
- Show HN: Cojen/Maker – lightweight Java class generator designed for ease of use
What are some alternatives?
Javassist - Java bytecode engineering toolkit
obfuscator - A java obfuscator (GUI)
Byteman - Byteman Project main repo
JavaParser - Java 1-18 Parser and Abstract Syntax Tree for Java with advanced analysis functionalities.
easydeviceinfo - :iphone: [Android Library] Get device information in a super easy way.
proguard-core - Library to read, write, analyze, and process java bytecode
timber - A logger with a small, extensible API which provides utility on top of Android's normal Log class.
jdk-sandbox - JDK Committers Sandbox
joda-time-android - Joda-Time library with Android specialization
StatusBarUtil - A util for setting status bar style on Android App.
golo-lang - Golo - a lightweight dynamic language for the JVM.