Compile and emit bytecode from generated code

Question

Is it possible to compile and emit .class files at run time? I have some generated servlet code and I want to compile them into classes and package it as a war.

Thanks.

Did you Google for `javax.tool.JavaCompiler`? http://docs.oracle.com/javase/7/docs/api/javax/tools/JavaCompiler.html — Iwillnotexist Idonotexist, Jun 17 '14 at 03:23
A way forward seems to be an override of `javax.tools.StandardJavaFileManager`, but I've never attempted that. Or this: http://stackoverflow.com/questions/12173294/compiling-fully-in-memory-with-javax-tools-javacompiler — Iwillnotexist Idonotexist, Jun 17 '14 at 03:34

score 1 · Answer 1 · edited Jun 17 '14 at 03:24

1

Yes, it is.

You can take a look at the Java Compiler API doc

Note however, that you will have to provide the corresponding ClassLoader and manage all the resources yourself.

If you want to generate bytecode from non-Java sources, you can also use ASM directly:

edited Jun 17 '14 at 03:24

asgs

3,718
6
36
49

answered Jun 17 '14 at 03:24

choeger

3,270
12
28

kay · Accepted Answer · 2014-06-17T18:22:56.940

1

Just export the generated codes into files in a temp directory, invoke javac in there, package them, serve them. Nothing fancy needed.

edited Jun 17 '14 at 18:22

answered Jun 17 '14 at 03:24

kay

23,543
10
89
128

This worked out just fine for me. Thanks for idea. I have uploaded the basic prototype on github (https://github.com/adeydas/Compilation-Unit) for reference. – Abhishek Dey Das Jun 17 '14 at 17:31

Compile and emit bytecode from generated code

2 Answers2