Difference between revisions of "Java"

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(Build classpath)
(Building a "java dongle" for chumby)
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* create a directory <code>lib</code> on the dongle
 
* create a directory <code>lib</code> on the dongle
 
* copy <code>/usr/arm-linux/share/classes.zip</code> to the <code>lib</code> directory on the dongle
 
* copy <code>/usr/arm-linux/share/classes.zip</code> to the <code>lib</code> directory on the dongle
* copy the contents of<code>/usr/arm-linux/lib/classpath/</code> to the <code>lib</code> directory on the dongle
+
* copy the contents of<code>/usr/arm-linux/lib/classpath/*.so</code> to the <code>lib</code> directory on the dongle
 +
* copy the contents of<code>/usr/arm-linux/lib/classpath/*.zip</code> to the <code>lib</code> directory on the dongle
 
* copy the contents of<code>/usr/arm-linux/share/classpath/</code> to the <code>lib</code> directory on the dongle
 
* copy the contents of<code>/usr/arm-linux/share/classpath/</code> to the <code>lib</code> directory on the dongle
 
* create the file <code>java</code> on the dongle with the contents:
 
* create the file <code>java</code> on the dongle with the contents:
 
  #!/bin/sh
 
  #!/bin/sh
 
  LD_LIBRARY_PATH=/mnt/usb/lib /mnt/usb/jamvm -mx8M -Xbootclasspath:/mnt/usb/lib/classes.zip:/mnt/usb/lib/glibj.zip $@
 
  LD_LIBRARY_PATH=/mnt/usb/lib /mnt/usb/jamvm -mx8M -Xbootclasspath:/mnt/usb/lib/classes.zip:/mnt/usb/lib/glibj.zip $@
 +
 +
==Too lazy to do all this?==
 +
Download [http://files.chumby.com/languages/java/chumby_jamvm.tgz chumby_jamvm.tgz] and unpack onto your dongle.
  
 
==Run programs!==
 
==Run programs!==

Revision as of 14:12, 13 October 2006

NOTE: this page is under development

How to build a simple java virtual machine for the chumby (assumes you have the development tools installed):

Building JamVM

Create a directory to hold the package

mkdir ~jamvm
cd jamvm

Download the source code

Go here and download the source code into ~/jamvm

Unpack the source code

tar xzvf java-1.4.3.tar.gz
cd javavm-1.4.3

Configure and build

./configure  --build=i386-linux --host=arm-linux --prefix=/usr/arm-linux
make

Strip the binary

arm-linux-strip src/jamvm

Install

sudo make install

This will copy the virtual machine to /usr/arm-linux/jamvm, and the custom class libraries to /usr/arm-linux/share/classes.zip

Download and unpack GNU classpath

cd ~/java

Download classpath-0.91

tar -xzf classpath-0.91.tar.gz
cd classpath-0.91

Build classpath

You'll need to have jikes installed (for Kubuntu, sudo apt-get install jikes)

./configure --build=i386-linux --host=arm-linux --prefix=/usr/arm-linux --with-jikes --disable-gtk-peer --disable-alsa --without-x --with-jni
make
sudo make install

Building a "java dongle" for chumby

  • copy /usr/arm-linux/bin/jamvm to the dongle
  • create a directory lib on the dongle
  • copy /usr/arm-linux/share/classes.zip to the lib directory on the dongle
  • copy the contents of/usr/arm-linux/lib/classpath/*.so to the lib directory on the dongle
  • copy the contents of/usr/arm-linux/lib/classpath/*.zip to the lib directory on the dongle
  • copy the contents of/usr/arm-linux/share/classpath/ to the lib directory on the dongle
  • create the file java on the dongle with the contents:
#!/bin/sh
LD_LIBRARY_PATH=/mnt/usb/lib /mnt/usb/jamvm -mx8M -Xbootclasspath:/mnt/usb/lib/classes.zip:/mnt/usb/lib/glibj.zip $@

Too lazy to do all this?

Download chumby_jamvm.tgz and unpack onto your dongle.

Run programs!

For example, if you have a program Hello.java compiled to Hello.class, you can run it with:

# java Hello
Hello World
#