The JDK source code is inside the src.zip, this article shows you how to get it on Windows, Ubuntu (Linux) and Mac OSX.

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1. Java 1.8 Software Is Installed. Once the software is installed, a confirmation window appears and then an applet is launched to verify the version of Java installed. See Note for Users of OS X that Include Apple Java 6 Plug-in. The JRE version used by the system can be determined in one of two ways.
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1. Windows

Lobby is a Lobby System for Bukkit Server witch are Java 1.8.xxx and Minecraft 1.8.X / 1.9.X / 1.10.X / 1.11.X. Technical detail: I am using the Java 1.8.121 Java Development Kit JDK and Java 1.8.121 Java Runntime Enviroment JRE also i am using the Minecraft Bukkit 1.11.2 Library witch runns on Servers down to Minecraft 1.8.0!!

In Windows, visit the Oracle website and download the JDK (not JRE).

Install the JDK and the src.zip is inside the JDK installed folder, for example :

2. Ubuntu (*nix)

In Linux, for example, Ubuntu, you can get the source code from OpenJDK.

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Search “openjdk”

Install the source code.

3. Mac OSX

In Mac OSX, get the JDK source code from Apple Developer, and download and install the Java for OS X Developer Package.

Later, find the source code here.

References

Java 6 Update 45 Download 32 Bit