JDK Native Code Implementation

Question

I would like to know if it is possible to get the Native Code implementation of JDK methods, such as:

public final class System {

/* First thing---register the natives */
private static native void registerNatives();
...
....}

possible duplicate of [Where to find source code for java.lang native methods?](http://stackoverflow.com/questions/2292629/where-to-find-source-code-for-java-lang-native-methods) — durron597, Dec 11 '12 at 00:21

Veger · Accepted Answer · 2012-12-10T13:07:16.123

2

Search for OpenJDK source code (it is open source), or any other open-source Java implementation and you can find the implementations.

The System class source for example (grabbing the complete OpenJDK source might be more convenient than this 'web view').

Note: registerNatives() is using native (C/C++ ?) code, so you'd need to track that down (from the complete source code for example). Or any other implementation you are interested in.

edited Dec 10 '12 at 13:07

answered Dec 10 '12 at 13:01

Veger

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The question is **about** native code, so no wonder it seems to be using it :) – Marko Topolnik Dec 10 '12 at 13:03
True :) But my answer is more in the line of 'choose your favorite open-source Java implementation and check out the code, with an OpenJDK example'. More like a pointer than the exact answer, so it is more generic applicable. – Veger Dec 10 '12 at 13:10
Except it misses the crucial link to the actual piece of code. Java source code is trivially easy to look up. – Marko Topolnik Dec 10 '12 at 13:11

score 1 · Answer 2 · answered Dec 10 '12 at 13:04

1

Above part of code is not enough to implement native method, you can find detailed information http://www.javaworld.com/javatips/jw-javatip23.html

answered Dec 10 '12 at 13:04

umert

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score 1 · Answer 3 · answered Dec 10 '12 at 13:16

All this is available from the OpenJDK Mercurial repo web view, but it is far from trivial to track down.

This here is a link to java.lang.System native code in the newest development version of JDK 7 Update stream. Hopefully you'll find your way around from there.

JDK Native Code Implementation

3 Answers3