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| #language en ~-[[DebianWiki/EditorGuide#translation|Translation(s)]]: English~ [[es/JavaFAQ|español]]- If you've questions about packaging Java Software for Debian, have a look at [[Java/Packaging]] and the [[JavaPackagingFAQ]]. |
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| In order to run java software, not only do you need the java-common package, but proboably also a sun jdk package such as sun-java5-bin. You may also want to installt he javacc package. I.e.: | In order to run java software you proboably need a jre package such as openjdk-6-jre. In order to compile java you need a jdk package such as openjdk-6-jdk. If you don't care which version of java is used, then default-jre and default-jdk are packages which exist on all platforms and give you something sensible. |
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| sudo aptitude install java-common sun-java5-bin sun-java5-jdk sun-java5-jre javacc | sudo apt-get install openjdk-6-jdk |
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| You reach java as /usr/bin/java . This file is really a link to /etc/alternatives/java , which in turn is a link to your java installation folder that's located in /usr/lib/jvm . For instance, java may link via /etc/alternatives/java to /usr/lib/jvm/java-1.5.0-sun/jre/bin/java . | You reach java as /usr/bin/java . This file is really a link to /etc/alternatives/java , which in turn is a link to your java installation folder that's located in /usr/lib/jvm . For instance, java may link via /etc/alternatives/java to /usr/lib/jvm/java-6-openjdk/jre/bin/java . |
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| ::BUILD FAILED ::(path)/build.xml:49: Unable to find a javac compiler; ::com.sun.tools.javac.Main is not on the classpath. ::Perhaps JAVA_HOME does not point to the JDK |
BUILD FAILED |
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| (path)/build.xml:49: Unable to find a javac compiler; | |
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| com.sun.tools.javac.Main is not on the classpath. | |
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| == About Blackdown Java and alternatives == | Perhaps JAVA_HOME does not point to the JDK |
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| === Question === I want to install the ["Java"] runtime 1.4.1 from Blackdown and do {{{ [apt-get] install j2re1.4 }}} it escapes with an error message : {{{ update-alternatives: unable to make /usr/lib/mozilla-cvs/plugins/javaplugin_oji.so.dpkg-tmp a symlink to /etc/alternatives/javaplugin_oji-mozilla-cvs.so: No such file or directory }}} What is wrong? === Answer === Seems that this error message happen when the directory {{{ /usr/lib/mozilla-cvs/plugins }}} does not exist. According to debian-user maillist this has been reported as a bug, but a workaround exist{{{ mkdir -p /usr/lib/mozilla-cvs/plugins }}} will make the install procedure continue without problem. See also: * http://www.debian.org/doc/manuals/debian-java-faq/ * ["JavaScript"] * ["Mozilla"] |
Translation(s): English~ español-
If you've questions about packaging Java Software for Debian, have a look at Java/Packaging and the JavaPackagingFAQ.
How get going with running and compiling Java programs in Debian real quick
In order to run java software you proboably need a jre package such as openjdk-6-jre. In order to compile java you need a jdk package such as openjdk-6-jdk. If you don't care which version of java is used, then default-jre and default-jdk are packages which exist on all platforms and give you something sensible.
sudo apt-get install openjdk-6-jdk
You reach java as /usr/bin/java . This file is really a link to /etc/alternatives/java , which in turn is a link to your java installation folder that's located in /usr/lib/jvm . For instance, java may link via /etc/alternatives/java to /usr/lib/jvm/java-6-openjdk/jre/bin/java .
If you have more detailed questions, you may be interested in seeing http://www.debian.org/doc/manuals/debian-java-faq/.
One particular reason that may lead your interest to read the tips above, is in case ant terminates for you with the error:
BUILD FAILED
(path)/build.xml:49: Unable to find a javac compiler;
com.sun.tools.javac.Main is not on the classpath.
Perhaps JAVA_HOME does not point to the JDK
About pbuilder and Sun's Java SDK
Question
I am build-depending on sun-javaX-jdk. However, I can't get an automatic build in a clean environment working, because sun-javaX-jdk does not install in a non-interactive environment, because it asks for license confirmation:
Unpacking sun-java6-jdk (from .../sun-java6-jdk_6-06-1_amd64.deb) ... sun-dlj-v1-1 license could not be presented try 'dpkg-reconfigure debconf' to select a frontend other than noninteractive
Answer
There are two possible answers:
Patch one and for all your pbuilder environment
$ sudo pbuilder login --save-after-login # echo "sun-java5-jdk shared/accepted-sun-dlj-v1-1 boolean true" | debconf-set-selections # echo "sun-java6-jdk shared/accepted-sun-dlj-v1-1 boolean true" | debconf-set-selections # exit
Add a hook to patch it on the fly
In http://lists.debian.org/debian-java/2008/05/msg00024.html Manuel Prinz says:
- I use a way to do that "on the fly" because I think it's easier to manage if you have several debconf settings to manage. Just add to your .pbuilderrc:
HOOKDIR=$HOME/debian/pbuilder/hooks
The create a file called i.e. "D50sun-java-licenses" in $HOOKDIR with the following content (it basically has to start with "D" and a two digit number for ordering):#!/bin/sh debconf-set-selections <<EOF sun-java5-jdk shared/accepted-sun-dlj-v1-1 boolean true sun-java6-jdk shared/accepted-sun-dlj-v1-1 boolean true EOF
This accepts the licenses before packages are installed. I prefer this because I can deactivate certain settings easily (by commenting out sections or renaming hook files) and do not have to keep a full chroot for every possible debconf setting. Also, I tend to forget which exactly setting I did in which chroot.
As mentioned in man pbuilder, you need to make the hook script (D50sun-java-licenses) executable before pbuilder will load it.