Is there a way to update all Java related alternatives?
Is there a way to quickly switch over all the Java related alternatives using update-alternatives?
For instance, if want to switch Java over to 7, I run sudo update-alternatives --config java and select the Java 7 OpenJdk. But if I run update-alternatives --get-selections | grep java I get the following,
appletviewer auto /usr/lib/jvm/java-6-openjdk-amd64/bin/appletviewer
extcheck auto /usr/lib/jvm/java-6-openjdk-amd64/bin/extcheck
idlj auto /usr/lib/jvm/java-6-openjdk-amd64/bin/idlj
itweb-settings auto /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/itweb-settings
jar auto /usr/lib/jvm/java-6-openjdk-amd64/bin/jar
jarsigner auto /usr/lib/jvm/java-6-openjdk-amd64/bin/jarsigner
java manual /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java
javac auto /usr/lib/jvm/java-6-openjdk-amd64/bin/javac
javadoc auto /usr/lib/jvm/java-6-openjdk-amd64/bin/javadoc
javah auto /usr/lib/jvm/java-6-openjdk-amd64/bin/javah
javap auto /usr/lib/jvm/java-6-openjdk-amd64/bin/javap
javaws auto /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/javaws
jconsole auto /usr/lib/jvm/java-6-openjdk-amd64/bin/jconsole
jdb auto /usr/lib/jvm/java-6-openjdk-amd64/bin/jdb
jexec auto /usr/lib/jvm/java-6-openjdk-amd64/jre/lib/jexec
jhat auto /usr/lib/jvm/java-6-openjdk-amd64/bin/jhat
jinfo auto /usr/lib/jvm/java-6-openjdk-amd64/bin/jinfo
jmap auto /usr/lib/jvm/java-6-openjdk-amd64/bin/jmap
jps auto /usr/lib/jvm/java-6-openjdk-amd64/bin/jps
jrunscript auto /usr/lib/jvm/java-6-openjdk-amd64/bin/jrunscript
jsadebugd auto /usr/lib/jvm/java-6-openjdk-amd64/bin/jsadebugd
jstack auto /usr/lib/jvm/java-6-openjdk-amd64/bin/jstack
jstat auto /usr/lib/jvm/java-6-openjdk-amd64/bin/jstat
jstatd auto /usr/lib/jvm/java-6-openjdk-amd64/bin/jstatd
keytool auto /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/keytool
native2ascii auto /usr/lib/jvm/java-6-openjdk-amd64/bin/native2ascii
orbd auto /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/orbd
pack200 auto /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/pack200
policytool auto /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/policytool
rmic auto /usr/lib/jvm/java-6-openjdk-amd64/bin/rmic
rmid auto /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/rmid
rmiregistry auto /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/rmiregistry
schemagen auto /usr/lib/jvm/java-6-openjdk-amd64/bin/schemagen
serialver auto /usr/lib/jvm/java-6-openjdk-amd64/bin/serialver
servertool auto /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/servertool
tnameserv auto /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/tnameserv
unpack200 auto /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/unpack200
wsgen auto /usr/lib/jvm/java-6-openjdk-amd64/bin/wsgen
wsimport auto /usr/lib/jvm/java-6-openjdk-amd64/bin/wsimport
xjc auto /usr/lib/jvm/java-6-openjdk-amd64/bin/xjc
As you can see, my Java alternative was switched over to 7, but every other alternative based on OpenJDK 6 was not switched over. Sure I could switch each one manually or write a script to do so, but I assume there is a better way to accomplish this.
Solution 1:
The trick is to use update-java-alternatives (from the java-common package).
So to go for OpenJDK 6 to 7, I used update-java-alternatives -l to get a list of Java alternatives and then used sudo update-java-alternatives -s java-1.7.0-openjdk-amd64 to the JDK.
NOTE: The command above threw the following errors,
update-alternatives: error: no alternatives for mozilla-javaplugin.so.
update-java-alternatives: plugin alternative does not exist: /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/IcedTeaPlugin.so
This is because the openjdk plugin is not installed by default. To fix run
sudo apt-get install icedtea-7-plugin
and rerun update-java-alternatives.
Solution 2:
jbro asked the same question at http://ubuntuforums.org/showthread.php?t=1817528 and wrote a script for this issue,
#!/bin/bash
update-alternatives --get-selections | grep -i openjdk |
while read line
do
alternative=$(echo $line | awk '{print $1}')
path=$(echo $line | awk '{print $3}')
newpath=$(echo $path | sed -e 's/java-6-openjdk/java-6-sun/')
status=unchanged
if [ -f $newpath ]
then
status=modified
echo "-> update-alternatives --set $alternative $newpath"
update-alternatives --set $alternative $newpath
else
echo "$alternative unchanged"
fi
done
If there isn't a better answer this seems like a solid workaround, but I am assume there must be a better way for update-alternatives to handle this.
I edited the code a little, since it does not let you do the changes before installing them. I added two more lines as follows...
#!/bin/bash
update-alternatives --get-selections | grep -i openjdk |
while read line
do
alternative=$(echo $line | awk '{print $1}')
path=$(echo $line | awk '{print $3}')
newpath=$(echo $path | sed -e 's/java-6-openjdk/java-6-sun/')
status=unchanged
if [ -f $newpath ]
then
status=modified
echo "-> update-alternatives --install /usr/bin/$alternative $alternative $newpath 1"
update-alternatives --install /usr/bin/$alternative $alternative $newpath 1
echo "-> update-alternatives --set $alternative $newpath"
update-alternatives --set $alternative $newpath
else
echo "$alternative unchanged"
fi
done