可以从 Java SE for WINdows 中包含的 src.zip 编译 jdk

Question

I wish to compile the JDK for a custom CPU. As far as I know, src.zip is made available with the Oracle Java SE 1.3 package.

Can I compile JDK 1.3 (for eg.) using the src.zip? Can I do this in a regular Eclipse/Netbeans project?

Answer 1

Can I compile the Java SE 1.3 from the src.zip included in the Java SE for Windows.

No you can't.

The src.zip file only includes the public classes in the java.* packages. (And possibly some of the javax.* packages.) AFAIK, it doesn't include the com.sun packages, and others that comprise internal APIs. And it certainly doesn't include the Java source code for the JDK tool chain; eg the Java compiler, the javadoc tool and so on.

One way to see what is missing would be to compare the contents of src.zip with the compiled zip and jar files in the JRE install.

And the src.zip doesn't include any of the native code implementation of the JVM; eg the JIT compiler, the garbage collector, the native libraries for threads, i/o, and so on.

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The complete source code for Java SE 1.3 was only available to 3rd-party Java vendors under a special license. AFAIK, the license fee was substantial. Java 1.3 was never released as open source.

If you want something that you could consider porting Java to a custom CPU, you would need to start with OpenJDK. But it will not be simply a matter of recompiling Java code.

Answer 2

As already answered, having just 'src.zip' is not enough for JDK build.

Building JDK from source is actually complicated process, you'll need to install native C++ compiler and some build tools: http://cr.openjdk.java.net/~ihse/demo-new-build-readme/common/doc/building.html

So answer for second part:

Can I do this in a regular Eclipse/Netbeans project?

is also no.