https://github.com/cedric05/java-no-body-compiler

java Compiler generating no body.
https://github.com/cedric05/java-no-body-compiler

compier ecj eclipse java javac

Last synced: about 1 month ago
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java Compiler generating no body.

• Host: GitHub
• URL: https://github.com/cedric05/java-no-body-compiler
• Owner: cedric05
• License: mit
• Created: 2020-08-28T17:03:00.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2024-04-17T10:30:03.000Z (9 months ago)
• Last Synced: 2024-10-05T23:21:46.992Z (3 months ago)
• Topics: compier, ecj, eclipse, java, javac
• Language: Java
• Homepage: https://github.com/cedric05
• Size: 3.76 MB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

README

        
## update

Latest update includes eclipse 4.20 release ecj

> - base [url](https://www.eclipse.org/downloads/download.php?file=/eclipse/downloads/drops4/R-4.31-202402290520/ecjsrc-4.31.jar)

> - mirror [url](https://mirror.kakao.com/eclipse/eclipse/downloads/drops4/R-4.31-202402290520/ecjsrc-4.31.jar)

> - download [url](https://www.eclipse.org/downloads/download.php?file=/eclipse/downloads/drops4/R-4.31-202402290520/ecjsrc-4.31.jar)

Java compiler compiles java source files to `.class` files without any body. 

# Goal 

Generate empty body .class with entire outline (package, method, attributes, exceptions). 

## Usage

Java compilation does not provide full native code (like graalvm does). For the compilation process it will read only structure but not the body. So for compiliation user won't need for original jar, unless you are bundling dependencies. one can use this project to generate fake jars using which you will save lot of network bandwidth and faster compilation.

download [javac-no-body.jar](https://github.com/cedric05/java-no-body-compiler/releases/download/v4.20/java-no-body-compiler-refs.tags.v4.20.jar)

```bash

java -jar javac-no-body.jar file.java

```

## example 

compile jdk source and generated [rt+javax+sun...jar](https://github.com/cedric05/java-no-body-compiler/releases/download/4.17-snapshot/rt-stub.jar.zip) size: 4.81MB. Original rt.jar size: 60+ MB 

## Source

Source of this compiler is copied with only one line change to facilitate this project [link](https://github.com/eclipse/eclipse.jdt.core).

jdt-core source is scrambled across multiple folders for above github repo. For easy access use [this link](#update)

```diff

---- a/org/eclipse/jdt/internal/compiler/ast/CompilationUnitDeclaration.java

++++ b/org/eclipse/jdt/internal/compiler/ast/CompilationUnitDeclaration.java

<       public boolean ignoreMethodBodies = false;

---

>       public boolean ignoreMethodBodies = true;

```

beware and bewarned,This project will not be helpful in real world senario.

Its for Pure research and educational purpose.