Where to get full source code for rt.jar?

Question

I am searching the source code for rt.jar for Oracle JRE/JDK 6 Update 22. The src.zip, which is included with the delivery, does not contain all sources, for examples the sun.* (e.g. sun.reflect.Reflection) packages are missing.

Where can I get a complete src.zip?

I don't think so. But you can use a decompiler (I've done it a lot :) ) — Bozho, Dec 07 '10 at 16:42
No, the Oracle JDK 7 is still missing a lot, like the sun package. — Sam Hartsfield, Jan 27 '12 at 22:41
Here is an alternative JDK7 RT.jar source package with all publicly available source files: http://jdk7src.sourceforge.net/ — Cojones, Mar 09 '12 at 23:16

rustyx · Answer 1 · 2015-12-17T20:52:44.943

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sun.* sources are a part of JDK that is proprietary closed source Sun code (or Oracle since 2010).

Having said that, the package you're interested in (sun.reflect.) happens to be included in OpenJDK 7, and all of OpenJDK source is open.

You can get the source here: http://jdk7src.sourceforge.net/

edited Dec 17 '15 at 20:52

answered Dec 07 '10 at 16:37

rustyx

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(citation needed :) but otherwise an excellent answer. +1 from me. – aioobe Dec 07 '10 at 16:39
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What about the JDK8? – kiltek Nov 22 '17 at 14:32

Thorbjørn Ravn Andersen · Accepted Answer · 2017-11-22T14:53:40.767

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EDIT 2017-11-22:

This answer was written in 2010 where the world was very different. If you just need the sources for the JRE classes, use the JRE in a JDK build - the included src.zip file is recognized by most modern IDE's.

If you really, really need the full source (if you are unsure, you don't) then find a suitable OpenJDK debug build or build OpenJDK from source.

OLD 2010 ANSWER:

You can download the complete source code for the JDK from http://download.java.net/jdk6/source/

VERY IMPORTANT NOTE: This is under the Java Research License, which may taint you in a way incompatible with what you need to know this for.

edited Nov 22 '17 at 14:53

answered Dec 07 '10 at 16:45

Thorbjørn Ravn Andersen

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Note: Oracle has decided to stop providing the Java 6 source under the JRL for new releases. – Thorbjørn Ravn Andersen Feb 18 '11 at 19:13
dead link, please update – Shpytyack Artem Nov 15 '17 at 13:23
@ShpytyackArtem It is 2017. Do you really, really need the complete source code for Java 6? – Thorbjørn Ravn Andersen Nov 15 '17 at 13:38
Yes, i would also like to step into the source code for the jdk 8. – kiltek Nov 22 '17 at 14:31
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@kiltek note that src.zip is included with any modern JDK which include source for most classes you will encounter in normal usage - eclipse discovers this automatically if you set the project JRE to a JDK. Also note that unless you make a special effort, the JRE classes will _not_ have debug information. – Thorbjørn Ravn Andersen Nov 22 '17 at 14:49
@Thorbjørn Ravn Andersen No i want to step through `sun.reflect.*` classes which are not included in the src.zip. – kiltek Nov 22 '17 at 15:03
@kiltek OpenJDK for you then. – Thorbjørn Ravn Andersen Nov 22 '17 at 16:36
@ThorbjørnRavnAndersen Thank you for your valuable inputs. Would you please suggest which others packages inside rt.jar are close sources apart from sun package? – Pratik Ambani Dec 19 '17 at 00:58
@PratikAmbani I do not understand what you want to know. – Thorbjørn Ravn Andersen Dec 19 '17 at 13:09
Thanks for replying, well, I can easily access source classes of all, util, lang, etc packages except sun package. May I please know why? – Pratik Ambani Dec 20 '17 at 03:51
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@PratikAmbani Because only those classes you mention are in there? src.zip is not covering all classes in the JVM, only those publicly documented. OpenJDK (debug build) for you too. – Thorbjørn Ravn Andersen Dec 20 '17 at 04:33

score 7 · Answer 3 · edited Jul 08 '14 at 11:11

If you use Eclipse, here is how you can link to Java source files:

As Thorbjørn Ravn Andersen mentioned, download the JDK source http://download.java.net/jdk6/source/ , and unzip the tar.gz file to a folder, say 'jdk.src';
Open your java file that refers to a base java class (say Thread) that comes from the JDK;
Tap F3 to open declaration, expect Eclipse to open a new tab with "source not found" message. It asks for the rt.jar source location, but you don't need to go through the trouble of compiling the JDK source to get it. Instead, click on the "attach source" button, in the "source attachment configuration" popup window, select "External Folder", then point to jdk.src/jdk/src/share/classes directory. Eclipse will then automatically load the newly found JDK class source code in the same window.

Thanks, but `sun.reflect.*` is not included. – kiltek Nov 22 '17 at 14:33 — kiltek, Nov 22 '17 at 14:33

score 6 · Answer 4 · answered Mar 09 '12 at 23:18

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http://jdk7src.sourceforge.net/

answered Mar 09 '12 at 23:18

Cojones

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score 2 · Answer 5 · answered Dec 07 '10 at 16:47

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AFAIK part of JDK 6 originates from OpenJDK or is integrated into OpenJDK. So maybe you find more insights here:

answered Dec 07 '10 at 16:47

Puce

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score 1 · Answer 6 · answered Dec 07 '10 at 16:51

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The classes without source are closely based on the code from OpenJDK. You can download this source and you can see not only the Java code but the C code as well. This can be a good resource for JNI examples too.

answered Dec 07 '10 at 16:51

Peter Lawrey

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score 0 · Answer 7 · answered Dec 07 '10 at 16:42

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Rustam is right: souces of sun.* are not available. But you can always decompile *.class and see pretty readable code (unfortunately without javadocs :( ).

answered Dec 07 '10 at 16:42

AlexR

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The license does not allow that. – Thorbjørn Ravn Andersen Dec 07 '10 at 16:43
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"The license does not allow that." oops. here goes the nice workaround opportunity! ;) – rustyx Dec 07 '10 at 16:48
Modern versions of IntellJ has a decompiler making this much easier. – Thorbjørn Ravn Andersen Dec 20 '17 at 04:35

Where to get full source code for rt.jar?

7 Answers7

EDIT 2017-11-22:

OLD 2010 ANSWER:

Linked