Tag Archives: Java

Updating The Sun JDK On Debian

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The final version of sun-jdk-6 in Debian Wheezy before it was removed was 6u26. The latest from Oracle (excluding Java7) is 6u30, so I decided to manually install it myself.

In fact it couldn’t be easier, all you do is download the jdk-6u30-linux-x64.bin file and run it, which extracts it to a directory called jdk1.6.0_30, which you then rename to java-6-sun-1.6.0_30 and move to /usr/lib/jvm, you then delete the java-6-sun symlink and recreate it to point to the newer directory:

root@localhost:/usr/lib/jvm$ ln -s java-6-sun-1.6.0_30 java-6-sun

As alternatives is setup to point to /usr/lib/jvm/java-6-sun there’s no need to update anything for the files we need to build Android for example:

root@localhost:/usr/lib/jvm$ update-alternatives --get-selections | grep java
...
appletviewer                   auto     /usr/lib/jvm/java-6-sun/bin/appletviewer
firefox-javaplugin.so          auto     /usr/lib/jvm/java-6-sun/jre/lib/amd64/libnpjp2.so
java                           manual   /usr/lib/jvm/java-6-sun/jre/bin/java
javac                          auto     /usr/lib/jvm/java-6-sun/bin/javac
javadoc                        auto     /usr/lib/jvm/java-6-sun/bin/javadoc
javah                          auto     /usr/lib/jvm/java-6-sun/bin/javah

jar seems to have been replaced by fastjar on Debian, so there’s no need to link the Oracle version in /usr/lib/jvm/java-6-sun/bin/jar

Finally its a good idea to add this environment variable in ~/.bashrc – again pointing to the symlink, not the specific version:

export JAVA_HOME="/usr/lib/jvm/java-6-sun"

Apparently Cyanogenmod7 will compile using OpenJDK6 (and 7 with a patch) even though AOSP won’t compile with anything other than Sun JDK6.

I’ve also updated the blog to WordPress 3.3

Compiling CM7 on Fedora

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I decided to have another go at compiling CM7, this time using Fedora 13 on real hardware rather than an virtualised Ubuntu 10.10, which also means adb/udev is already working from when I rooted the ZTE Blades.

I downloaded and installed the Oracle/Sun JDK 6u24 (which includes the JRE).

Setting up “alternatives” to point to the Oracle JDK instead of OpenJDK/GCJ doesn’t work 100% as at least javadoc, appletviewer and javah have to be manually symlinked:

ln -s /usr/java/jdk1.6.0_24/bin/javadoc /usr/bin/javadoc
ln -s /usr/java/jdk1.6.0_24/bin/appletviewer /usr/bin/appletviewer
ln -s /usr/java/jdk1.6.0_24/bin/javah /usr/bin/javah

None of the below tutorials explained why “alternatives” doesn’t work:

Just for good measure I added the following to ~/.bashrc

export JAVA_HOME="/usr/java/jdk1.6.0_24"

After that the compile worked, except it got stuck at some point with a javadoc problem, a quick “make update-api && mka” fixed that.

The cyanogen wiki instructions are incomplete regarding making an AVD using your ROM. Also CM7 now uses the 2.3.3 v10 API, so the last stage should really be:

cd ~/android-sdk-linux_x86/platforms/
cp -R android-10/ android-10-cyanogen/
cp ~/cyanogenmod/out/target/product/generic/*.img android-10-cyanogen/images/
 
cd ~/.android/avd/
cp -R Gingerbread.avd/ cyanogenmod.avd/
cp Gingerbread.ini cyanogenmod.ini

Edit ~/.android/avd/cyanogenmod.ini to read:

target=android-10
path=~/.android/avd/cyanogenmod.avd

Edit ~/.android/avd/cyanogenmod.avd/config.ini to read:

hw.lcd.density=240
skin.name=WVGA800
skin.path=platforms/android-10-cyanogen/skins/WVGA800
vm.heapSize=24
hw.ramSize=256
image.sysdir.1=platforms/android-10-cyanogen/images/

Then you end up with:

CM7