Is it possible to browse the source code of OpenJDK online, just like I can do with SourceForge’s projects? I never used Mercury before, so I felt confused.
(Note: I don’t want to download the source. I just want to browse it online, to see how some methods are implemented.)
OpenJDK is now on GitHub: https://git.openjdk.java.net/jdk
It is a large project, but you will find the implementations of the core classes under jdk/src/java.base/share/classes.
For instance you can find the implementation of java.util.List here.
If you need to browse older versions, you still need to use the old Mercurial interface.
The Mercurial interface there is quite confusing if you are not used to it, and since this is a large project, it can be hard to find what you are looking for.
Here is an example:
To find the JDK6 implementation java.util.List, select “jdk6”, “jdk”, select browse. Then browse to src/share/classes/java/util/List.java.
The latest JDK 8 OpenJDK Java Class Library source code can be found here: http://hg.openjdk.java.net/jdk8u/jdk8u/jdk/file/tip/src/share/classes/
Here is the basic step to get latest or any released version of
Openjdk 8 (or any existing java version) source code, and use them in
- [browse source]
- Open url for jdk, e.g http://hg.openjdk.java.net/jdk8u/jdk8u/jdk/
- choose proper tag, e.g
- then click
- then browse into folder
- [download source]
- then click one of
gz, to download source in relevant compressed format, (e.g for
zipformat, the url will be: http://hg.openjdk.java.net/jdk8u/jdk8u/jdk/archive/2ab13901d6f1.zip/src/share/classes/)
- [use in eclipse]
- uncompress it,
- zip the folder “classes/”, make “classes/” as the root dir of .zip file, (e.g first
cd jdk-2ab13901d6f1/src/share/, then
zip -r openjdk_8u73_b2_src.zip classes/)
- move the created zip file to proper location, it will stay there for a while, (e.g
mv openjdk_8u73_b2_src.zip /media/Eric/software/java/jdk/openjdk/openjdk8u73-b02/source/)
- in eclipse, specify source file for jars of installed jre, could specify the source attachment for each jar of installed jre respectively, the most common jar is probably
- optionally, might need refresh project to make it totally take effect, not sure is that necessary,
- test it: in eclipse,
ctrl + shift + t, then input
Cancellable, select the
sun.nio.fs.Cancellableof corresponding installed jre,
if the source code is available, then it’s good, because this source is not available in
jdk_home/src.zip, it must be from the additional openjdk source,
- switch source back: could switch back to use “jdk_home/src.zip”, if don’t want to use the external openjdk source,
Here’s a way to browse the repositories and look at just the bits you want.
Is that what you are asking?
Append a “/file” to the root URLs to view the browser like this:
Grepcode.com is great for similar things – not only OpenJDK sources, with searching in classes/methods and links between classes directly in highlighted code:
As mentioned in the other answers, the source code repository is at https://hg.openjdk.java.net
However, the OpenJDK team mirrors some of the projects on GitHub: https://github.com/openjdk