Building JamVM and GNU Classpath and Jikes (for Java support in webOS) with scratchbox2

NOTE : 02/01/2012 : Jikes, the Java compiler works and compile a basic HelloWorld java program with success, 06/01/2012 : JamVM (JRE/Java runtime) works with a HelloWorld java program in text mode in a console !!!  Next steps : Have a Hello World java program with AWT GUI in a X window that works with JamVM JRE, and next have sound with JamVM JRE

= Requirements =

First, follow the tutorial WebOS Internals PDK to set up the cross compilation environment.

Next install gcj needed for compiling Gnu Classpath sudo apt-get install gcj

Next install cvs needed for getting Gnu Classpath latest dev source code (0.99 in CVS) sudo apt-get install cvs

Next install cvs needed for getting escher latest dev source code (1.9.90 in Hg) sudo apt-get install mercurial

= Compiling =

Create your working folder : cd /home/ubuntu mkdir java-project cd java-project

Go in ARM mode in your ScratchBox 2 : sb2 -M /srv/preware/cross-compile/staging/mapping-armv7

Create the folders
rm -Rf /usr/local/* mkdir -p /usr/local/bin/ mkdir -p /usr/local/include/ mkdir -p /usr/local/lib/ mkdir -p /usr/local/share/ or sudo rm -Rf /media/internal/* sudo mkdir -p /media/internal/opt sudo chown -R ubuntu:ubuntu /media mkdir -p /media/internal/opt/bin/ mkdir -p /media/internal/opt/include/ mkdir -p /media/internal/opt/lib/ mkdir -p /media/internal/opt/share/

Quit ScratchBox 2 : exit

Install Zlib needed by JamVM and LibXML2
Go in ARM mode in your ScratchBox 2 : sb2 -M /srv/preware/cross-compile/staging/mapping-armv7

cd /srv/preware/cross-compile/packages/common rm -Rf /srv/preware/cross-compile/packages/common/zlib/build make -C zlib ARCH=armv7 stage

Quit ScratchBox 2 : exit

Install LibXML et LibXSLT needed to create libxmlj by Gnu Classpath (optionnal - only for XML parsing support as with web services)
GNU Classpath 0.98 need libxml-2.0 >= 2.6.8 and libxslt >= 1.1.11. Then we choose LibXML 2.6.26 and LibXSLT 1.1.17 with the same release date 06/06/2006

Note :  Do not use LibXML 2.6.26 in /srv/preware/cross-compile/packages/common/libxml2 or http://git.webos-internals.org/preware/cross-compile/tree/packages/common/libxml2  because the Makefile use install-pkgconfigDATA and make install in include folder (install only files in include and lib folders but not in bin folder).  The problem is that LibXSLT's configure want to find the file /usr/local/bin/xml2-config

Go in ARM mode in your ScratchBox 2 : sb2 -M /srv/preware/cross-compile/staging/mapping-armv7

LibXML 2.6.26 : cd /home/ubuntu/java-project wget ftp://xmlsoft.org/libxml2/old/libxml2-2.6.26.tar.gz tar xzvf libxml2-2.6.26.tar.gz cd libxml2-2.6.26 LDFLAGS="-L/usr/local/lib -Wl,-rpath=/usr/local/lib" CPPFLAGS="-I/usr/local/include" ./configure --prefix=/usr/local --with-zlib=/usr/local make make install cd ..

LibXSLT 1.1.17 : cd /home/ubuntu/java-project wget ftp://xmlsoft.org/libxml2/old/libxslt-1.1.17.tar.gz tar xzvf libxslt-1.1.17.tar.gz cd libxslt-1.1.17 LDFLAGS="-L/usr/local/lib -Wl,-rpath=/usr/local/lib" CPPFLAGS="-I/usr/local/include" ./configure --prefix=/usr/local --with-libxml-prefix=/usr/local make make install cd ..

Quit ScratchBox 2 : exit

Install Alsa needed by Gnu Classpath (optionnal - only for GUI mode with sound)
cd /srv/preware/cross-compile/packages/media rm -Rf /srv/preware/cross-compile/packages/media/alsa-lib/build make -C alsa-lib ARCH=armv7 stage

Install X needed by Gnu Classpath (optionnal - only for GUI mode)
cd /srv/preware/cross-compile/packages/x rm -Rf /srv/preware/cross-compile/packages/x/libx11/build make -C libx11 ARCH=armv7 stage

Install Escher needed by Gnu Classpath (optionnal - only for GUI mode)
Goal : bridge between Java and X server

Escher useful information here.

Ant download page : http://archive.apache.org/dist/ant/binaries/ and http://ant.apache.org/bindownload.cgi

$ java -version java version "1.5.0" gij (GNU libgcj) version 4.5.2 ...

Building escher 0.3
Escher download page : http://sourceforge.net/projects/escher/files/escher/0.3/ and http://escher.sourceforge.net/

cd /home/ubuntu/java-project wget http://heanet.dl.sourceforge.net/project/escher/escher/0.3/escher-0.3.tar.gz wget http://archive.apache.org/dist/ant/binaries/apache-ant-1.7.1-bin.tar.gz tar xzvf escher-0.3.tar.gz tar xzvf apache-ant-1.7.1-bin.tar.gz export ANT_HOME=/home/ubuntu/java-project/apache-ant-1.7.1 export PATH=$PATH:/home/ubuntu/java-project/apache-ant-1.7.1 cd escher-0.3 ant -f build.xml clean ant -f build.xml dist

Go in ARM mode in your ScratchBox 2 : sb2 -M /srv/preware/cross-compile/staging/mapping-armv7

mkdir -p /usr/local/share/classpath/ cp dist/escher-0.3.jar /usr/local/share/classpath/ or mkdir -p /media/internal/opt/share/classpath/ cp dist/escher-0.3.jar /media/internal/opt/share/classpath/

Quit ScratchBox 2 : exit

If you do not want to compile escher-0.3.jar, you can download HERE, ready to use.

Building escher 1.9.90
Escher source code : http://escher.hg.sourceforge.net:8000/hgroot/escher/escher and http://escher.sourceforge.net/

cd /home/ubuntu/java-project hg clone http://escher.hg.sourceforge.net:8000/hgroot/escher/escher escher-1.9.90 wget http://archive.apache.org/dist/ant/binaries/apache-ant-1.7.1-bin.tar.gz tar xzvf apache-ant-1.7.1-bin.tar.gz export ANT_HOME=/home/ubuntu/java-project/apache-ant-1.7.1 export PATH=$PATH:/home/ubuntu/java-project/apache-ant-1.7.1 cd escher-1.9.90 edit build.xml and replace the line  by  . ant -f build.xml clean ant -f build.xml dist

Go in ARM mode in your ScratchBox 2 : sb2 -M /srv/preware/cross-compile/staging/mapping-armv7

mkdir -p /usr/local/share/classpath/ cp dist/escher-1.9.90.jar /usr/local/share/classpath/ or mkdir -p /media/internal/opt/share/classpath/ cp dist/escher-1.9.90.jar /media/internal/opt/share/classpath/

Quit ScratchBox 2 : exit

Install GNU Classpath
Goal : implement almost all of the classes from Java J2SE 1.4 and 5.0.

GNU Classpath at Wikipedia : http://en.wikipedia.org/wiki/GNU_Classpath

GNU Classpath download page / website : http://www.gnu.org/software/classpath/downloads/downloads.html and http://www.gnu.org/software/classpath/

Note: here, Gnu Classpath is only compiled for working in console mode. No support for sound or GUI in Java programs. The extra libs needed for these supports are detailed here : http://www.gnu.org/software/classpath/docs/hacking.html#SEC5  For compiling with sound support, ALSA libs are needed. For compiling with GUI support, X libs are needed AND Escher or QT or GTK libs.  For low footprint memory, Escher is the best choice. More useful information here. 

Building Gnu Classpath 0.98
Patch for Gnu Classpath 0.98 with escher 0.3.0 : X Awt peers to escher lib broken

Compile : cd java-project wget ftp://ftp.gnu.org/gnu/classpath/classpath-0.98.tar.gz tar xzvf classpath-0.98.tar.gz

Here, we need to patch classpath-0.98 because it can not compile with escher-0.3 but only the old escher-0.2.3 wget http://gcc.gnu.org/bugzilla/attachment.cgi?id=18352 mv "attachment.cgi?id=18352" patch_escher-0.3_with_gnu-classpath-0.98.patch $ patch -p0 < patch_escher-0.3_with_gnu-classpath-0.98.patch patching file classpath-0.98/gnu/java/awt/peer/x/GLGraphics.java patching file classpath-0.98/gnu/java/awt/peer/x/XEventPump.java patching file classpath-0.98/gnu/java/awt/peer/x/XGraphicsDevice.java

cd classpath-0.98

Go in ARM mode in your ScratchBox 2 : sb2 -M /srv/preware/cross-compile/staging/mapping-armv7

Case 1 - Without GUI and sound support : ./configure --prefix=/usr/local --disable-examples --without-x --disable-qt-peer --disable-gtk-peer --disable-gconf-peer --disable-plugin --disable-alsa --disable-dssi make make install cd ..

Case 2 - With GUI and sound support : LDFLAGS="-L/usr/local/lib -Wl,-rpath=/usr/local/lib" CPPFLAGS="-I/usr/local/include" ./configure --prefix=/usr/local --disable-examples --with-x --disable-qt-peer --disable-gtk-peer --disable-gconf-peer --disable-plugin --enable-alsa --disable-dssi --with-escher=/home/ubuntu/java-project/escher-0.3/src --enable-local-sockets --enable-collections --enable-default-toolkit=gnu.java.awt.peer.x.XToolkit make make install cd ..

Case 3 - With GUI and sound and XMLJ support (XMLJ is used to parse XML files as web services, etc...) : LDFLAGS="-L/usr/local/lib -Wl,-rpath=/usr/local/lib" CPPFLAGS="-I/usr/local/include" ./configure --prefix=/usr/local --disable-examples --with-x --disable-qt-peer --disable-gtk-peer --disable-gconf-peer --disable-plugin --enable-alsa --disable-dssi --with-escher=/home/ubuntu/java-project/escher-0.3/src --enable-local-sockets --enable-collections --enable-xmlj --enable-default-toolkit=gnu.java.awt.peer.x.XToolkit make make install cd ..

Case 3b - Without sound and With GUI and XMLJ support (XMLJ is used to parse XML files as web services, etc...) : LDFLAGS="-L/usr/local/lib -Wl,-rpath=/media/internal/opt/lib" CPPFLAGS="-I/usr/local/include" ./configure --prefix=/media/internal/opt --disable-examples --with-x --disable-qt-peer --disable-gtk-peer --disable-gconf-peer --disable-plugin --disable-alsa --disable-dssi --with-escher=/home/ubuntu/java-project/escher-0.3/src --enable-local-sockets --enable-collections --enable-xmlj --enable-default-toolkit=gnu.java.awt.peer.x.XToolkit make make install cd ..

Note 1 : Here, we have the option --disable-plugin because the webkit web browser in webOS can use this java plugin. But maybe, this Java plugin can be used with PreFox web browser.  Note 2 : Here, we have the option --with-escher=/home/ubuntu/java-project/escher-0.3/src and NOT /usr/local/share/classpath because Gnu Classpath compile fine ONLY if he can find folder with the escher's java .class files and NOT the escher-0.3.jar  Note 3 : Here, we have the option --enable-default-toolkit=gnu.java.awt.peer.x.XToolkit because if the parameter enable-default-toolkit is not set, it will use gnu.java.awt.peer.gtk.GtkToolkit by default (compile with GTK support) (Source part "dnl Default AWT toolkit" in the file HERE).

Building Gnu Classpath 0.99-CVS
Patch for Gnu Classpath 0.99 with escher 1.9.90 : XPeer (~Escher) patch

Compile : cd java-project cvs -z3 -d:pserver:anonymous@cvs.savannah.gnu.org:/sources/classpath export -DNOW classpath mv classpath classpath-0.99 Here, we need to patch classpath-0.99 because it can not compile with escher-1.9.90 but only with the old escher-0.2.3 Go to XPeer (~Escher) patch, and copy in a patch_escher-1.9.90_with_gnu-classpath-0.99.patch, all the lines from to ZPixmap getZPixmap then next copy the patch_escher-1.9.90_with_gnu-classpath-0.99.patch file in classpath-0.99 folder $ cd classpath-0.99 $ ./autogen.sh $ patch -p0 < patch_escher-1.9.90_with_gnu-classpath-0.99.patch patching file gnu/java/awt/peer/x/GLGraphics.java patching file gnu/java/awt/peer/x/KeyboardMapping.java patching file gnu/java/awt/peer/x/PixmapVolatileImage.java patching file gnu/java/awt/peer/x/XEventPump.java patching file gnu/java/awt/peer/x/XFontPeer.java patching file gnu/java/awt/peer/x/XFramePeer.java patching file gnu/java/awt/peer/x/XGraphics2D.java patching file gnu/java/awt/peer/x/XGraphicsConfiguration.java patching file gnu/java/awt/peer/x/XGraphicsDevice.java patching file gnu/java/awt/peer/x/XGraphicsEnvironment.java patching file gnu/java/awt/peer/x/XImage.java patching file gnu/java/awt/peer/x/XWindowPeer.java patching file gnu/java/awt/peer/x/ZPixmapDataBuffer.java Hunk #3 succeeded at 51 with fuzz 1. patching file gnu/java/awt/peer/x/GLGraphics.java Reversed (or previously applied) patch detected! Assume -R? [n] n Apply anyway? [n] n Skipping patch. 1 out of 1 hunk ignored -- saving rejects to file gnu/java/awt/peer/x/GLGraphics.java.rej patching file gnu/java/awt/peer/x/KeyboardMapping.java Reversed (or previously applied) patch detected! Assume -R? [n] n Apply anyway? [n] n Skipping patch. 3 out of 3 hunks ignored -- saving rejects to file gnu/java/awt/peer/x/KeyboardMapping.java.rej patching file gnu/java/awt/peer/x/PixmapVolatileImage.java Reversed (or previously applied) patch detected! Assume -R? [n] n Apply anyway? [n] n Skipping patch. 4 out of 4 hunks ignored -- saving rejects to file gnu/java/awt/peer/x/PixmapVolatileImage.java.rej patching file gnu/java/awt/peer/x/XEventPump.java Reversed (or previously applied) patch detected! Assume -R? [n] n Apply anyway? [n] n Skipping patch. 14 out of 14 hunks ignored -- saving rejects to file gnu/java/awt/peer/x/XEventPump.java.rej patching file gnu/java/awt/peer/x/XFontPeer.java Reversed (or previously applied) patch detected! Assume -R? [n] n Apply anyway? [n] n Skipping patch. 2 out of 2 hunks ignored -- saving rejects to file gnu/java/awt/peer/x/XFontPeer.java.rej patching file gnu/java/awt/peer/x/XFramePeer.java Reversed (or previously applied) patch detected! Assume -R? [n] n Apply anyway? [n] n Skipping patch. 1 out of 1 hunk ignored -- saving rejects to file gnu/java/awt/peer/x/XFramePeer.java.rej patching file gnu/java/awt/peer/x/XGraphics2D.java Reversed (or previously applied) patch detected! Assume -R? [n] n Apply anyway? [n] n Skipping patch. 12 out of 12 hunks ignored -- saving rejects to file gnu/java/awt/peer/x/XGraphics2D.java.rej patching file gnu/java/awt/peer/x/XGraphicsConfiguration.java Reversed (or previously applied) patch detected! Assume -R? [n] n Apply anyway? [n] n Skipping patch. 3 out of 3 hunks ignored -- saving rejects to file gnu/java/awt/peer/x/XGraphicsConfiguration.java.rej patching file gnu/java/awt/peer/x/XGraphicsDevice.java Reversed (or previously applied) patch detected! Assume -R? [n] n Apply anyway? [n] nn Skipping patch. 5 out of 5 hunks ignored -- saving rejects to file gnu/java/awt/peer/x/XGraphicsDevice.java.rej patching file gnu/java/awt/peer/x/XGraphicsEnvironment.java Reversed (or previously applied) patch detected! Assume -R? [n] n Apply anyway? [n] n Skipping patch. 2 out of 2 hunks ignored -- saving rejects to file gnu/java/awt/peer/x/XGraphicsEnvironment.java.rej patching file gnu/java/awt/peer/x/XImage.java Reversed (or previously applied) patch detected! Assume -R? [n] n Apply anyway? [n] n Skipping patch. 2 out of 2 hunks ignored -- saving rejects to file gnu/java/awt/peer/x/XImage.java.rej patching file gnu/java/awt/peer/x/XWindowPeer.java Reversed (or previously applied) patch detected! Assume -R? [n] n Apply anyway? [n] n Skipping patch. 7 out of 7 hunks ignored -- saving rejects to file gnu/java/awt/peer/x/XWindowPeer.java.rej patching file gnu/java/awt/peer/x/ZPixmapDataBuffer.java Reversed (or previously applied) patch detected! Assume -R? [n] n Apply anyway? [n] n Skipping patch. 3 out of 3 hunks ignored -- saving rejects to file gnu/java/awt/peer/x/ZPixmapDataBuffer.java.rej - $ rm -Rf gnu/java/awt/peer/x/*.java.rej $ rm -Rf gnu/java/awt/peer/x/*.java.orig Go in ARM mode in your ScratchBox 2 : sb2 -M /srv/preware/cross-compile/staging/mapping-armv7
 * 1) Eclipse Workspace Patch 1.0

Case 1 - Without GUI and sound support : ./configure --prefix=/usr/local --disable-examples --without-x --disable-qt-peer --disable-gtk-peer --disable-gconf-peer --disable-plugin --disable-alsa --disable-dssi make make install cd ..

Case 2 - With GUI and sound support : LDFLAGS="-L/usr/local/lib -Wl,-rpath=/usr/local/lib" CPPFLAGS="-I/usr/local/include" ./configure --prefix=/usr/local --disable-examples --with-x --disable-qt-peer --disable-gtk-peer --disable-gconf-peer --disable-plugin --enable-alsa --disable-dssi --with-escher=/home/ubuntu/java-project/escher-1.9.90/src --enable-local-sockets --enable-collections --enable-default-toolkit=gnu.java.awt.peer.x.XToolkit make make install cd ..

Case 3 - With GUI and sound and XMLJ support (XMLJ is used to parse XML files as web services, etc...) : LDFLAGS="-L/usr/local/lib -Wl,-rpath=/usr/local/lib" CPPFLAGS="-I/usr/local/include" ./configure --prefix=/usr/local --disable-examples --with-x --disable-qt-peer --disable-gtk-peer --disable-gconf-peer --disable-plugin --enable-alsa --disable-dssi --with-escher=/home/ubuntu/java-project/escher-1.9.90/src --enable-local-sockets --enable-collections --enable-xmlj --enable-default-toolkit=gnu.java.awt.peer.x.XToolkit make make install cd ..

Case 3b - Without sound and With GUI and XMLJ support (XMLJ is used to parse XML files as web services, etc...) : LDFLAGS="-L/usr/local/lib -Wl,-rpath=/media/internal/opt/lib" CPPFLAGS="-I/usr/local/include" ./configure --prefix=/media/internal/opt --disable-examples --with-x --disable-qt-peer --disable-gtk-peer --disable-gconf-peer --disable-plugin --disable-alsa --disable-dssi --with-escher=/home/ubuntu/java-project/escher-1.9.90/src --enable-local-sockets --enable-collections --enable-xmlj --enable-default-toolkit=gnu.java.awt.peer.x.XToolkit make make install cd ..

Note 1 : Here, we have the option --disable-plugin because the webkit web browser in webOS can use this java plugin. But maybe, this Java plugin can be used with PreFox web browser.  Note 2 : Here, we have the option --with-escher=/home/ubuntu/java-project/escher-1.9.90/src and NOT /usr/local/share/classpath because Gnu Classpath compile fine ONLY if he can find folder with the escher's java .class files and NOT the escher-0.3.jar  Note 3 : Here, we have the option --enable-default-toolkit=gnu.java.awt.peer.x.XToolkit because if the parameter enable-default-toolkit is not set, it will use gnu.java.awt.peer.gtk.GtkToolkit by default (compile with GTK support) (Source part "dnl Default AWT toolkit" in the file HERE).

Install libffi needed by JamVM
'''Note : You have segmentation fault with JamVM if you not compile it with libffi. More info about this segmentation fault problem in this thread.'''

libffi download page / website : http://sourceware.org/libffi/ cd /home/ubuntu/java-project wget ftp://sourceware.org/pub/libffi/libffi-3.0.10.tar.gz tar xzvf libffi-3.0.10.tar.gz cd libffi-3.0.10 ./configure --prefix=/usr/local --with-gcc-arch=armv7 make make install cp include/ffi_common.h /usr/local/include cp arm-unknown-linux-gnueabi/include/ffi.h /usr/local/include cp src/arm/ffitarget.h /usr/local/include cd .. or cd /home/ubuntu/java-project wget ftp://sourceware.org/pub/libffi/libffi-3.0.10.tar.gz tar xzvf libffi-3.0.10.tar.gz cd libffi-3.0.10 ./configure --prefix=/media/internal/opt --with-gcc-arch=armv7 make make install cp include/ffi_common.h /media/internal/opt/include cp arm-unknown-linux-gnueabi/include/ffi.h /media/internal/opt/include cp src/arm/ffitarget.h /media/internal/opt/include cd ..

Install JamVM
Goal : can launch Java program

JamVM at Wikipedia : http://en.wikipedia.org/wiki/JamVM

JamVM download page / website : http://sourceforge.net/projects/jamvm/files/jamvm/JamVM%201.5.4/ and http://jamvm.sourceforge.net/

cd /home/ubuntu/java-project wget http://freefr.dl.sourceforge.net/project/jamvm/jamvm/JamVM%201.5.4/jamvm-1.5.4.tar.gz tar xzvf jamvm-1.5.4.tar.gz cd jamvm-1.5.4 export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib export LD_RUN_LIBRARY_PATH=$LD_RUN_LIBRARY_PATH:/usr/local/lib LDFLAGS="-L/usr/local/lib -Wl,-rpath=/usr/local/lib" CPPFLAGS="-I/usr/local/include" ./configure --prefix=/usr/local --with-classpath-install-dir=/usr/local --enable-ffi make make install cd .. or cd /home/ubuntu/java-project wget http://freefr.dl.sourceforge.net/project/jamvm/jamvm/JamVM%201.5.4/jamvm-1.5.4.tar.gz tar xzvf jamvm-1.5.4.tar.gz cd jamvm-1.5.4 export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib:/media/internal/opt/lib export LD_RUN_LIBRARY_PATH=$LD_RUN_LIBRARY_PATH:/usr/local/lib:/media/internal/opt/lib LDFLAGS="-L/usr/local/lib -L/media/internal/opt/lib -Wl,-rpath=/media/internal/opt/lib" CPPFLAGS="-I/usr/local/include -I/media/internal/opt/include" ./configure --prefix=/media/internal/opt --with-classpath-install-dir=/media/internal/opt -enable-ffi make make install cd ..

Note 1 : do not use CFLAGS parameter to compile JamVM, there is maybe a problem (segmentation fault) with this parameter as you can find it in this post.

Install Jikes
Goal : can compile Java program

Jikes at Wikipedia : http://en.wikipedia.org/wiki/Jikes

download page / website : http://sourceforge.net/projects/jikes/files/ and http://jikes.sourceforge.net/

wget http://freefr.dl.sourceforge.net/project/jikes/Jikes/1.22/jikes-1.22.tar.bz2 bzip2 -d jikes-1.22.tar.bz2 tar xvf jikes-1.22.tar cd jikes-1.22 ./configure --prefix=/usr/local make make install cd .. or wget http://freefr.dl.sourceforge.net/project/jikes/Jikes/1.22/jikes-1.22.tar.bz2 bzip2 -d jikes-1.22.tar.bz2 tar xvf jikes-1.22.tar cd jikes-1.22 ./configure --prefix=/media/internal/opt make make install cd ..

Quit Scratch Box : exit

= Installing the files on your device =

cd /srv/preware/cross-compile/staging/armv7/usr sudo chown -R root:root * sudo tar cvf local.tar * copy the local.tar on your webos device connected as USB key on your computer or cd /media/internal sudo chown -R root:root * sudo tar cvf opt.tar opt copy the opt.tar on your webos device connected as USB key on your computer

On your computer connect at your webOS device novacom -t open tty://

Move the files in the good folders : cd /media/internal mkdir java-project mv local.tar java-project cd java-project tar Pxvf local.tar chmod -R 755 * chown root:root * cd bin cp -p * /usr/local/bin cp -p -r include lib man share /usr/local

Fix missing symbolic links : cd /usr/local/lib ln -s libjvm.so.0.0.0 libjvm.so ln -s libjvm.so.0.0.0 libjvm.so.0 ln -s libz.so.1.2.3 libz.so ln -s libz.so.1.2.3 libz.so.1 ln -s libffi.so.5.0.10 libffi.so.5.0 ln -s libffi.so.5.0.10 libffi.so.5 ln -s libffi.so.5.0.10 libffi.so ln -s /usr/local/share/classpath/glibj.zip rt.jar cd classpath ln -s libjavaio.so.0.0.0 libjavaio.so ln -s libjavaio.so.0.0.0 libjavaio.so.0 ln -s libjavalangmanagement.so.0.0.0 libjavalangmanagement.so ln -s libjavalangmanagement.so.0.0.0 libjavalangmanagement.so.0 ln -s libjavalangreflect.so.0.0.0 libjavalangreflect.so ln -s libjavalangreflect.so.0.0.0 libjavalangreflect.so.0 ln -s libjavalang.so.0.0.0 libjavalang.so ln -s libjavalang.so.0.0.0 libjavalang.so.0 ln -s libjavanet.so.0.0.0 libjavanet.so ln -s libjavanet.so.0.0.0 libjavanet.so.0 ln -s libjavanio.so.0.0.0 libjavanio.so ln -s libjavanio.so.0.0.0 libjavanio.so.0 ln -s libjavautil.so.0.0.0 libjavautil.so ln -s libjavautil.so.0.0.0 libjavautil.so.0

or

cd /media/internal mv opt.tar /media/internal tar Pxvf opt.tar chmod -R 755 opt chown root:root opt

Fix missing symbolic links (note symbolic links with ln -s are not possible in this file system/folder): cd /media/internal/opt/lib cp -p libjvm.so.0.0.0 libjvm.so cp -p libjvm.so.0.0.0 libjvm.so.0 cp -p libffi.so.5.0.10 libffi.so.5.0 cp -p libffi.so.5.0.10 libffi.so.5 cp -p libffi.so.5.0.10 libffi.so cp -p /media/internal/opt/share/classpath/glibj.zip rt.jar cd classpath cp -p libjavaio.so.0.0.0 libjavaio.so cp -p libjavaio.so.0.0.0 libjavaio.so.0 cp -p libjavalangmanagement.so.0.0.0 libjavalangmanagement.so cp -p libjavalangmanagement.so.0.0.0 libjavalangmanagement.so.0 cp -p libjavalangreflect.so.0.0.0 libjavalangreflect.so cp -p libjavalangreflect.so.0.0.0 libjavalangreflect.so.0 cp -p libjavalang.so.0.0.0 libjavalang.so cp -p libjavalang.so.0.0.0 libjavalang.so.0 cp -p libjavanet.so.0.0.0 libjavanet.so cp -p libjavanet.so.0.0.0 libjavanet.so.0 cp -p libjavanio.so.0.0.0 libjavanio.so cp -p libjavanio.so.0.0.0 libjavanio.so.0 cp -p libjavautil.so.0.0.0 libjavautil.so cp -p libjavautil.so.0.0.0 libjavautil.so.0 cp -p libxmlj.so.0.0.0 libxmlj.so cp -p libxmlj.so.0.0.0 libxmlj.so.0

= Basic testing for the main binaries =

JamVM
or
 * 1) /usr/local/bin/jamvm -version
 * 1) /media/internal/opt/bin/jamvm -version

java version "1.5.0" JamVM version 1.5.4 Copyright (C) 2003-2010 Robert Lougher  - This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. - This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. - Build information: Execution Engine: inline-threaded interpreter with stack-caching Compiled with: gcc 4.2.1 Boot Library Path: /usr/local/lib/classpath Boot Class Path: /usr/local/share/jamvm/classes.zip:/usr/local/share/classpath/glibj.zip

Jikes
or
 * 1) /usr/local/bin/jikes -version
 * 1) /media/internal/opt/bin/jikes -version

Jikes Compiler - Version 1.22 - 3 October 2004 Copyright (C) IBM Corporation 1997-2003, 2004. - Licensed Materials - Program Property of IBM - All Rights Reserved. Originally written by Philippe Charles and David Shields of IBM Research, Jikes is now maintained and refined by the Jikes Project at: <http://ibm.com/developerworks/opensource/jikes> Please consult this URL for more information and for reporting problems.

= Compiling and Running a HelloWorld Java Program =

Compiling
For this example, I use a novacom connexion on my Palm Pre. cd /media/internal vi myfirstjavaprog.java and add the following lines in the myfirstjavaprog.java (source) : class myfirstjavaprog {    public static void main(String args[]) {   System.out.println("Hello World!"); } }

Compile : ls -l ... -rwxrwxrwx   1 root     root           440 Jan  2 14:38 myfirstjavaprog.class ...
 * 1) /usr/local/bin/jikes -bootclasspath /usr/local/share/jamvm/classes.zip:/usr/local/share/classpath/glibj.zip myfirstjavaprog.java

Running
/usr/local/bin/jamvm myfirstjavaprog or /usr/local/bin/jamvm -client -Xbootclasspath:/usr/local/share/jamvm/classes.zip:/usr/local/share/classpath/glibj.zip myfirstjavaprog and you can see : Hello World!

Requirements for working
mv .Xauthority .Xauthority.OLD mkxauth -c localhost mkxauth -c 127.0.0.1 xauth list localhost/unix:0 MIT-MAGIC-COOKIE-1  02bab2e14519a798471b74a19a5557d6 localhost:0 MIT-MAGIC-COOKIE-1  055c66aab6ce789758499d026a8b236d 127.0.0.1/unix:0 MIT-MAGIC-COOKIE-1  055c66aab6ce789758499d026a8b236d mv .Xauthority .Xauthority.NEW mv .Xauthority.OLD .Xauthority Copy the .Xauthority.NEW file on your webOS device as USB drive <BR> mv .Xauthority.NEW /media/internal cp -p .Xauthority.NEW /var/home/root/.Xauthority chown root:root /var/home/root/.Xauthority chmod 644 /var/home/root/.Xauthority
 * You need to install Xterm and Xecutah applications and to REBOOT your webOS device.
 * You need to have an .Xauthority file on your webOS device (detailed steps on your Linux computer / not webOS device ) :

Compiling
For this example, I use a novacom connexion on my Palm Pre. cd /media/internal vi HelloWorld.java and add the following lines in the HelloWorld.java (source) : import java.awt.*; import java.awt.event.*; public class HelloWorld extends Frame { public static void main (String [] argv){ HelloWorld h = new HelloWorld; }   public HelloWorld{ setTitle("Hello World!"); setSize(150, 125); Panel hello = new Panel; add("Center", hello); Button button = new Button("OK"); add("South", button); button.addActionListener(new ActionListener {         public void actionPerformed(ActionEvent e) {             System.exit(0);          }        }); setVisible(true); int width = hello.getWidth; int height = hello.getHeight; Graphics g = hello.getGraphics; g.drawString("Hello World!", width/2 - 25, height/2); addWindowListener(new WindowAdapter{          public void windowClosing(WindowEvent e){                System.exit(0);           }      }); } }

Compile : ls -l ... -rwxrwxrwx   1 root     root           440 Jan  2 14:38 HelloWorld.class ...
 * 1) /usr/local/bin/jikes -bootclasspath /usr/local/share/jamvm/classes.zip:/usr/local/share/classpath/glibj.zip HelloWorld.java

Running

 * Launch Xcecutah app, and launch Xterm in your Xcecutah app.
 * Check that the /var/home/root/.Xauthority file is created on your webOPS device.

To test X Awt peer, you must remove "-nolisten TCP" from XServer start script. (Source) and in console type the command line xhost+ (source).

/usr/local/bin/jamvm -Xbootclasspath:/media/internal/opt/share/jamvm/classes.zip:/media/internal/opt/share/classpath/glibj.zip:/media/internal/opt/share/classpath/escher-0.3.jar:/media/internal/opt/share/classpath/collections.jar -Dawt.toolkit=gnu.java.awt.peer.x.XToolkit HelloWorld or /media/internal/opt/bin/jamvm -Xbootclasspath:/media/internal/opt/share/jamvm/classes.zip:/media/internal/opt/share/classpath/glibj.zip:/media/internal/opt/share/classpath/escher-0.3.jar:/media/internal/opt/share/classpath/collections.jar -Dawt.toolkit=gnu.java.awt.peer.x.XToolkit HelloWorld

and you can see a GUI window : Hello World!

Common error : java.net.ConnectException: Connection refused at gnu.java.nio.VMChannel.connect(Native Method) ... at HelloWorld.main(HelloWorld.java:5) Exception in thread "main" java.lang.NullPointerException at gnu.x11.Display.init_streams(Display.java:1177) ... --> Xcetah and Xterm apps are not launched

Can't find Xauthority file: /home/root/.Xauthority java.net.UnknownHostException: John KENNEDY - Palm Pre at java.net.VMInetAddress.getHostByName(Native Method) ... at HelloWorld.main(HelloWorld.java:5) Exception in thread "main" java.lang.ClassCastException: [B at gnu.x11.Window.change_property(Window.java:742) ... --> The file /home/root/.Xauthority is not created

java.net.UnknownHostException: John KENNEDY - Palm Pre at java.net.VMInetAddress.getHostByName(Native Method) ... at HelloWorld.main(HelloWorld.java:5) Exception in thread "main" java.lang.ClassCastException: [B at gnu.x11.Window.change_property(Window.java:742) --> Your webOS device use your name and the name of your webOS as host name. Need to change this name by localhost. The fix ??? <BR> THE FIX (SOURCE): <BR> Check : <BR> John KENNEDY - Palm Pre Modify : Check : <BR> localhost
 * 1) hostname
 * 1) hostname localhost
 * 1) hostname

Audio mode
Playing Audio in Java

= Files installed by each program =

Gnu Classpath
[SB2 mapping-armv7 armv7] ubuntu@ubuntu-VirtualBox classpath-0.98 $ ls -l /usr/local/bin total 52 -rwxr-xr-x 1 ubuntu ubuntu 2073 2012-01-01 19:23 gappletviewer -rwxr-xr-x 1 ubuntu ubuntu 2058 2012-01-01 19:23 gjar -rwxr-xr-x 1 ubuntu ubuntu 2070 2012-01-01 19:23 gjarsigner -rwxr-xr-x 1 ubuntu ubuntu 2062 2012-01-01 19:23 gjavah -rwxr-xr-x 1 ubuntu ubuntu 2113 2012-01-01 19:23 gjdoc -rwxr-xr-x 1 ubuntu ubuntu 2066 2012-01-01 19:23 gkeytool -rwxr-xr-x 1 ubuntu ubuntu 2084 2012-01-01 19:23 gnative2ascii -rwxr-xr-x 1 ubuntu ubuntu 2060 2012-01-01 19:23 gorbd -rwxr-xr-x 1 ubuntu ubuntu 2060 2012-01-01 19:23 grmic -rwxr-xr-x 1 ubuntu ubuntu 2060 2012-01-01 19:23 grmid -rwxr-xr-x 1 ubuntu ubuntu 2074 2012-01-01 19:23 grmiregistry -rwxr-xr-x 1 ubuntu ubuntu 2075 2012-01-01 19:23 gserialver -rwxr-xr-x 1 ubuntu ubuntu 2070 2012-01-01 19:23 gtnameserv [SB2 mapping-armv7 armv7] ubuntu@ubuntu-VirtualBox classpath-0.98 $ ls -l /usr/local/include total 80 -rw-r--r-- 1 ubuntu ubuntu 3516 2012-01-01 19:23 jawt.h -rw-r--r-- 1 ubuntu ubuntu  2349 2012-01-01 19:23 jawt_md.h -rw-r--r-- 1 ubuntu ubuntu 66655 2012-01-01 19:23 jni.h -rw-r--r-- 1 ubuntu ubuntu  1547 2012-01-01 19:23 jni_md.h [SB2 mapping-armv7 armv7] ubuntu@ubuntu-VirtualBox classpath-0.98 $ ls -l /usr/local/lib total 12 drwxr-xr-x 2 ubuntu ubuntu 4096 2012-01-01 19:23 classpath -rw-r--r-- 1 ubuntu ubuntu 1437 2012-01-01 19:23 logging.properties drwxr-xr-x 2 ubuntu ubuntu 4096 2012-01-01 19:23 security

[SB2 mapping-armv7 armv7] ubuntu@ubuntu-VirtualBox classpath-0.98 $ ls -l /usr/local/lib/classpath total 1228 -rwxr-xr-x 1 ubuntu ubuntu   806 2012-01-01 19:23 libjavaio.la lrwxrwxrwx 1 ubuntu ubuntu     18 2012-01-01 19:23 libjavaio.so -> libjavaio.so.0.0.0 lrwxrwxrwx 1 ubuntu ubuntu    18 2012-01-01 19:23 libjavaio.so.0 -> libjavaio.so.0.0.0 -rwxr-xr-x 1 ubuntu ubuntu 177244 2012-01-01 19:23 libjavaio.so.0.0.0 -rwxr-xr-x 1 ubuntu ubuntu   818 2012-01-01 19:23 libjavalang.la -rwxr-xr-x 1 ubuntu ubuntu    878 2012-01-01 19:23 libjavalangmanagement.la lrwxrwxrwx 1 ubuntu ubuntu     30 2012-01-01 19:23 libjavalangmanagement.so -> libjavalangmanagement.so.0.0.0 lrwxrwxrwx 1 ubuntu ubuntu    30 2012-01-01 19:23 libjavalangmanagement.so.0 -> libjavalangmanagement.so.0.0.0 -rwxr-xr-x 1 ubuntu ubuntu 25052 2012-01-01 19:23 libjavalangmanagement.so.0.0.0 -rwxr-xr-x 1 ubuntu ubuntu   860 2012-01-01 19:23 libjavalangreflect.la lrwxrwxrwx 1 ubuntu ubuntu     27 2012-01-01 19:23 libjavalangreflect.so -> libjavalangreflect.so.0.0.0 lrwxrwxrwx 1 ubuntu ubuntu    27 2012-01-01 19:23 libjavalangreflect.so.0 -> libjavalangreflect.so.0.0.0 -rwxr-xr-x 1 ubuntu ubuntu 24773 2012-01-01 19:23 libjavalangreflect.so.0.0.0 lrwxrwxrwx 1 ubuntu ubuntu    20 2012-01-01 19:23 libjavalang.so -> libjavalang.so.0.0.0 lrwxrwxrwx 1 ubuntu ubuntu    20 2012-01-01 19:23 libjavalang.so.0 -> libjavalang.so.0.0.0 -rwxr-xr-x 1 ubuntu ubuntu 378668 2012-01-01 19:23 libjavalang.so.0.0.0 -rwxr-xr-x 1 ubuntu ubuntu   812 2012-01-01 19:23 libjavanet.la lrwxrwxrwx 1 ubuntu ubuntu     19 2012-01-01 19:23 libjavanet.so -> libjavanet.so.0.0.0 lrwxrwxrwx 1 ubuntu ubuntu    19 2012-01-01 19:23 libjavanet.so.0 -> libjavanet.so.0.0.0 -rwxr-xr-x 1 ubuntu ubuntu 263348 2012-01-01 19:23 libjavanet.so.0.0.0 -rwxr-xr-x 1 ubuntu ubuntu   812 2012-01-01 19:23 libjavanio.la lrwxrwxrwx 1 ubuntu ubuntu     19 2012-01-01 19:23 libjavanio.so -> libjavanio.so.0.0.0 lrwxrwxrwx 1 ubuntu ubuntu    19 2012-01-01 19:23 libjavanio.so.0 -> libjavanio.so.0.0.0 -rwxr-xr-x 1 ubuntu ubuntu 311502 2012-01-01 19:23 libjavanio.so.0.0.0 -rwxr-xr-x 1 ubuntu ubuntu   818 2012-01-01 19:23 libjavautil.la lrwxrwxrwx 1 ubuntu ubuntu     20 2012-01-01 19:23 libjavautil.so -> libjavautil.so.0.0.0 lrwxrwxrwx 1 ubuntu ubuntu    20 2012-01-01 19:23 libjavautil.so.0 -> libjavautil.so.0.0.0 -rwxr-xr-x 1 ubuntu ubuntu 27292 2012-01-01 19:23 libjavautil.so.0.0.0 If you compile Gnu Classpath with --enable-alsa and --enable-xmlj, you have 6 more libraries in /usr/local/lib/classpath folder : -rwxr-xr-x 1 ubuntu ubuntu   877 2012-01-08 00:53 libgjsmalsa.la -rwxr-xr-x 1 ubuntu ubuntu  67246 2012-01-08 00:53 libgjsmalsa.so -rwxr-xr-x 1 ubuntu ubuntu    876 2012-01-08 00:53 libxmlj.la lrwxrwxrwx 1 ubuntu ubuntu     16 2012-01-08 00:53 libxmlj.so -> libxmlj.so.0.0.0 lrwxrwxrwx 1 ubuntu ubuntu    16 2012-01-08 00:53 libxmlj.so.0 -> libxmlj.so.0.0.0 -rwxr-xr-x 1 ubuntu ubuntu 381252 2012-01-08 00:53 libxmlj.so.0.0.0

[SB2 mapping-armv7 armv7] ubuntu@ubuntu-VirtualBox classpath-0.98 $ ls -l /usr/local/lib/security total 4 -rw-r--r-- 1 ubuntu ubuntu 2489 2012-01-01 19:23 classpath.security [SB2 mapping-armv7 armv7] ubuntu@ubuntu-VirtualBox classpath-0.98 $ ls -l /usr/local/share total 12 drwxr-xr-x 2 ubuntu ubuntu 4096 2012-01-01 19:23 classpath drwxr-xr-x 2 ubuntu ubuntu 4096 2012-01-01 19:22 info drwxr-xr-x 3 ubuntu ubuntu 4096 2012-01-01 19:22 man

[SB2 mapping-armv7 armv7] ubuntu@ubuntu-VirtualBox classpath-0.98 $ ls -l /usr/local/share/classpath total 10780 -rw-r--r-- 1 ubuntu ubuntu 9832050 2012-01-01 19:22 glibj.zip -rw-r--r-- 1 ubuntu ubuntu 1204211 2012-01-01 19:23 tools.zip If you compile Gnu Classpath with --with-escher and --enable-collections, you have 2 more files in /usr/local/share/classpath folder : -rw-r--r-- 1 ubuntu ubuntu  382375 2012-01-08 00:53 collections.jar -rw-r--r-- 1 ubuntu ubuntu  515042 2012-01-07 16:07 escher-0.3.jar

[SB2 mapping-armv7 armv7] ubuntu@ubuntu-VirtualBox classpath-0.98 $ ls -l /usr/local/share/info total 292 -rw-r--r-- 1 ubuntu ubuntu 83532 2012-01-01 19:22 cp-hacking.info -rw-r--r-- 1 ubuntu ubuntu 106990 2012-01-01 19:22 cp-tools.info -rw-r--r-- 1 ubuntu ubuntu 98304 2012-01-01 19:22 cp-vmintegration.info -rw-r--r-- 1 ubuntu ubuntu   815 2012-01-01 19:22 dir [SB2 mapping-armv7 armv7] ubuntu@ubuntu-VirtualBox classpath-0.98 $ ls -l /usr/local/share/man total 4 drwxr-xr-x 2 ubuntu ubuntu 4096 2012-01-01 19:23 man1 [SB2 mapping-armv7 armv7] ubuntu@ubuntu-VirtualBox classpath-0.98 $ ls -l /usr/local/share/man/man1 total 164 -rw-r--r-- 1 ubuntu ubuntu 7997 2012-01-01 19:22 gappletviewer.1 -rw-r--r-- 1 ubuntu ubuntu 5592 2012-01-01 19:23 gcjh.1 -rw-r--r-- 1 ubuntu ubuntu 5918 2012-01-01 19:23 gjar.1 -rw-r--r-- 1 ubuntu ubuntu 9590 2012-01-01 19:23 gjarsigner.1 -rw-r--r-- 1 ubuntu ubuntu 5750 2012-01-01 19:23 gjavah.1 -rw-r--r-- 1 ubuntu ubuntu 35310 2012-01-01 19:23 gjdoc.1 -rw-r--r-- 1 ubuntu ubuntu 35536 2012-01-01 19:23 gkeytool.1 -rw-r--r-- 1 ubuntu ubuntu 4594 2012-01-01 19:23 gnative2ascii.1 -rw-r--r-- 1 ubuntu ubuntu 4825 2012-01-01 19:23 gorbd.1 -rw-r--r-- 1 ubuntu ubuntu 5084 2012-01-01 19:23 grmid.1 -rw-r--r-- 1 ubuntu ubuntu 5036 2012-01-01 19:23 grmiregistry.1 -rw-r--r-- 1 ubuntu ubuntu 4512 2012-01-01 19:23 gserialver.1 -rw-r--r-- 1 ubuntu ubuntu 4592 2012-01-01 19:23 gtnameserv.1

JamVM
[SB2 mapping-armv7 armv7] ubuntu@ubuntu-VirtualBox jamvm-1.5.4 $ ls -l /usr/local/bin total 444 -rwxr-xr-x 1 ubuntu ubuntu 400821 2012-01-01 19:38 jamvm

[SB2 mapping-armv7 armv7] ubuntu@ubuntu-VirtualBox jamvm-1.5.4 $ ls -l /usr/local/include total 108 -rw-r--r-- 1 ubuntu ubuntu 14042 2012-01-01 19:38 jni.h

Note : JamVM replace the jni.h file from Gnu Classpath by his own jni.h file

[SB2 mapping-armv7 armv7] ubuntu@ubuntu-VirtualBox jamvm-1.5.4 $ ls -l /usr/local/lib total 636 -rwxr-xr-x 1 ubuntu ubuntu   817 2012-01-01 19:37 libjvm.la lrwxrwxrwx 1 ubuntu ubuntu     15 2012-01-01 19:37 libjvm.so -> libjvm.so.0.0.0 lrwxrwxrwx 1 ubuntu ubuntu    15 2012-01-01 19:37 libjvm.so.0 -> libjvm.so.0.0.0 -rwxr-xr-x 1 ubuntu ubuntu 556829 2012-01-01 19:37 libjvm.so.0.0.0 lrwxrwxrwx 1 ubuntu ubuntu    46 2012-01-01 19:38 rt.jar -> /usr/local/share/classpath/glibj.zip

[SB2 mapping-armv7 armv7] ubuntu@ubuntu-VirtualBox jamvm-1.5.4 $ ls -l /usr/local/share total 16 drwxr-xr-x 2 ubuntu ubuntu 4096 2012-01-01 19:38 jamvm

[SB2 mapping-armv7 armv7] ubuntu@ubuntu-VirtualBox jamvm-1.5.4 $ ls -l /usr/local/share/jamvm total 24 -rw-r--r-- 1 ubuntu ubuntu 22133 2009-12-31 19:42 classes.zip

Jikes
[SB2 mapping-armv7 armv7] ubuntu@ubuntu-VirtualBox jikes-1.22 $ ls -ltr /usr/local/bin total 8260 -rwxr-xr-x 1 ubuntu ubuntu 8002423 2012-01-01 19:56 jikes

[SB2 mapping-armv7 armv7] ubuntu@ubuntu-VirtualBox jikes-1.22 $ ls -ltr /usr/local/include total 116

-rw-r--r-- 1 ubuntu ubuntu 5794 2012-01-01 19:56 jikesapi.h

[SB2 mapping-armv7 armv7] ubuntu@ubuntu-VirtualBox jikes-1.22 $ ls -ltr /usr/local/share total 20

drwxr-xr-x 3 ubuntu ubuntu 4096 2012-01-01 19:56 doc

[SB2 mapping-armv7 armv7] ubuntu@ubuntu-VirtualBox jikes-1.22 $ ls -ltr /usr/local/share/doc/jikes-1.22 total 12 -rw-r--r-- 1 ubuntu ubuntu 11886 2012-01-01 19:56 license.htm

= Links used to do the webOS port =

Iphone
Patches used for the JamVM port for Iphone http://test.saurik.com/iphone/jamvm/

IPhone Java http://web.archive.org/web/20071230000038/http://iphone.fiveforty.net/wiki/index.php/IPhone_Java

Talk:IPhone Java http://web.archive.org/web/20071230050607/http://iphone.fiveforty.net/wiki/index.php/Talk:IPhone_Java

(JamVM Forum) JamVM port to iPhone? http://sourceforge.net/projects/jamvm/forums/forum/256481/topic/1866438

Tutorials Java on Iphone : http://iphoneroot.com/category/java/ http://iphoneroot.com/tutorial-install-java-on-the-iphone/

JamVM
JamVM developer blog http://draenog.blogspot.com/

how to build GNU Classpath and JamVM http://sourceforge.net/projects/jamvm/forums/forum/256481/topic/3208847?message=7193290 http://free-electrons.com/doc/java-labs.odt http://wiki.chumby.com/index.php/Java http://fuseyism.com/openjdk/cvmi/jamvmport.xhtml

JamVM used in Ubuntu https://launchpad.net/ubuntu/oneiric/+source/openjdk-6/6b23~pre4-0ubuntu1 with the latest code in GIT ??? http://draenog.blogspot.com/2011/02/openjdkjamvm-git-repository.html

OpenJDK
For the future when the next JamVM release will be available, replace Gnu Classpath by OpenJDK Java classes :

CrossCompilingOpenJDK https://evolvis.org/plugins/mediawiki/wiki/jalimo/index.php/CrossCompilingOpenJDK

CrossCompileFaq http://icedtea.classpath.org/wiki/CrossCompileFaq

JDK6 for embedded ARM http://mail.openjdk.java.net/pipermail/jdk6-dev/2009-April/000455.html

Simple Swing Tests with OpenJDK/Classpath/Classpath+Escher http://old.nabble.com/Simple-Swing-Tests-with-OpenJDK-Classpath-Classpath%2BEscher-td28605374.html