This is typically (depending) on the configuration file set your options. If you look in /etc/java or something like /etc/java-7-openjdk you should see the configuration files. There is only 1 program which provides java SLES11 # update-alternatives -config java Making the change if you already have them installed and just need to change the default. Lrwxrwxrwx 1 root root 36 Mar 19 06:03 jre_ibm_exports -> /usr/lib64/jvm-exports/jre-1.6.0-ibm Lrwxrwxrwx 1 root root 36 Mar 19 06:03 jre_exports -> /usr/lib64/jvm-exports/jre-1.6.0-ibm The man page give the path that the update-alternatives uses for its directory. Slave keytool: /usr/lib64/jvm/jre-1.6.0-ibm/bin/keytoolĬurrent `best' version is /usr/lib64/jvm/jre-1.6.0-ibm/bin/java. Slave policytool: /usr/lib64/jvm/jre-1.6.0-ibm/bin/policytool Slave jre_exports: /usr/lib64/jvm-exports/jre-1.6.0-ibm Slave tnameserv: /usr/lib64/jvm/jre-1.6.0-ibm/bin/tnameserv Slave rmiregistry: /usr/lib64/jvm/jre-1.6.0-ibm/bin/rmiregistry Link currently points to /usr/lib64/jvm/jre-1.6.0-ibm/bin/java SLES11 # update-alternatives -display java Notes: This might make it more understandable. Java HotSpot(TM) 64-Bit Server VM (build 21.0-b17, mixed mode) Java(TM) SE Runtime Environment (build 1.7.0-b147) * 0 /usr/lib/jvm/jdk1.7.0/bin/java 1065 auto modeġ /usr/lib/jvm/java-6-openjdk/jre/bin/java 1061 manual modeĢ /usr/lib/jvm/jdk1.7.0/bin/java 1065 manual modeĪnd because 1065 is higher than 1061, the fresh installed java 7 will be used by default on my machine There are 2 choices for the alternative java (providing /usr/bin/java). To check my installation i use –config parameter
Update-alternatives -install /usr/bin/javac javac /usr/lib/jvm/jdk1.7.0/bin/javac 1065 Update-alternatives -install /usr/bin/java java /usr/lib/jvm/jdk1.7.0/bin/java 1065 Found a site that has a pretty good explanation: LINKĭebian has a script to maintain different version of programs like java called update-alternatives.
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