User Tools

Site Tools


problem:linux:ubuntu_java
no way to compare when less than two revisions

Differences

This shows you the differences between two versions of the page.


problem:linux:ubuntu_java [2019/04/12 13:13] (current) – created - external edit 127.0.0.1
Line 1: Line 1:
 +====== Ubuntu Java ======
 +
 +**By default Ubuntu runs GCJ, the GNU Java, instead of Sun's Java.**
 +
 +The 'easiest' way to enable Sun's Java is to run it from your launcher. For example:
 +
 +  /usr/lib/jvm/java-1.5.0-sun/bin/java -Dplugins.dir=/home/<YOURHOME>/ImageJ 
 +      -Xmx128m -cp /opt/ImageJ/ij.jar:/usr/lib/jvm/java-1.5.0-sun/lib/tools.jar ij.ImageJ
 +
 +this command line specifies the location of your plugins directory (-Dplugins.dir), sets memory to 128 Mb (-Xmx128m) and allows plugins to be compiled (/usr/lib/jvm/java-1.5.0-sun/lib/tools.jar). Note that this is for Sun's Java 1.5 - it will need to be changed accordingly to the version you are running.
 +
 +Additionally, you can export the Java classpath in your .bashrc:
 +
 +  export PATH=/usr/lib/jvm/java-1.5.0-sun/bin:$PATH
 +
 +making sure that your 'JAVA_HOME' is set to the proper folder in your .bashrc:
 +
 +  export JAVA_HOME=/usr/lib/jvm/java-1.5.0-sun
 +
 +Or make an alias in your .bashrc for 'java':
 +
 +  alias java='/usr/lib/jvm/java-1.5.0-sun/bin/java'
 +
 +(Based on Albert Cardona's email to the mailing list.)
 +
 +A Debian-based repository can also be used, contributed and tested by Paolo Ariano. It can be downloaded from: 
 +http://www.personalweb.unito.it/paolo.ariano/software.html
 +
 +===== Java Installation on an Ubuntu based system =====
 +
 +First install the Java version you want/need:
 +
 +  sudo apt-get install sun-java6-jre sun-java6-plugin sun-java6-fonts
 +
 +replace the 6 by 5, if you need a Java 5. You can also replace the jre by jdk if you want a javac.
 +
 +To change the default java command:
 +
 +  sudo update-alternatives --config java
 +
 +and select the Version you want.
 +
 +You can check the result by:
 +
 +  user@ubuntu:~$ java -version
 +  java version "1.5.0_15"
 +  Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_15-b04)
 +  Java HotSpot(TM) Server VM (build 1.5.0_15-b04, mixed mode)
 +
  
problem/linux/ubuntu_java.txt · Last modified: 2019/04/12 13:13 by 127.0.0.1

Donate Powered by PHP Valid HTML5 Valid CSS Driven by DokuWiki