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JAVA Binary Kernel Support for Linux v1.01 ------------------------------------------ Linux beats them ALL! While all other OS's are TALKING about direct support of Java Binaries in the OS, Linux is doing it! You execute Java classes as you would any other executable, after a few small details: 1) You MUST FIRST install the Java Developers Kit for Linux. The Java on Linux HOWTO gives the details on getting and installing this. This HOWTO can be found at: ftp://sunsite.unc.edu/pub/Linux/docs/HOWTO/Java-HOWTO If you install the JDK in a location other than the suggested directory of /usr/local/java, then you will need to edit the kernel's fs/binfmt_java.c file and make the needed change to the _PATH_JAVA definition at the top of that file. 2) You must chmod the '*.class' files you wish to execute with the execute bit. This is not normally (till now) done with '.class' files. 3) You must optionally export a CLASSPATH environment variable, if you plan to use Java applications installed outside of /usr/local/java/classes/*. 4) Either compile your kernel with Java support builtin, or as a loadable module. If a module, load it with insmod or kerneld. To test your new setup, enter in the following simple Java app, and name it "HelloWorld.java": class HelloWorld { public static void main(String args[]) { System.out.println("Hello World!"); } } Now compile the application with: /usr/local/java/bin/javac HelloWorld.java Set the executable permissions of the binary file, with: chmod 755 HelloWorld.class And then execute it: ./HelloWorld.class Yes, it's JUST THAT EASY! ;-) ----------------------------------------------------------------- Nope, I didn't forget about Java Applets! ;-) While this may not be the best way to do this, it works! Take any html file used with the Java appletviewer (like the demo/Blink/example1.html file), and: 1) Insert a new first line of: <!--applet--> Make sure the '<' is the first character in the file. This will be treated as a valid HTML comment outside of this Java Applet support, so the modified file can still be used with all known browsers. 2) If you install the JDK in a location other than the suggested directory of /usr/local/java, then you will need to edit the kernel's fs/binfmt_java.c file and make the needed change to the _PATH_APPLET definition at the top of that file. 3) You must chmod the '*.html' files you wish to execute with the execute bit. This is not normally (till now) done with '.html' files. 4) And then execute it. Brian A. Lantz brian@lantz.com |