![]() ![]() Update-alternatives -install /usr/bin/jstat jstat /usr/lib/jvm/jdk-17/bin/jstat 1081 Update-alternatives -install /usr/bin/jimage jimage /usr/lib/jvm/jdk-17/bin/jimage 1081 Update-alternatives -install /usr/bin/jmod jmod /usr/lib/jvm/jdk-17/bin/jmod 1081 Update-alternatives -install /usr/bin/keytool keytool /usr/lib/jvm/jdk-17/bin/keytool 1081 Update-alternatives -install /usr/bin/jexec jexec /usr/lib/jvm/jdk-17/lib/jexec 1081 Update-alternatives -install /usr/bin/jspawnhelper jspawnhelper /usr/lib/jvm/jdk-17/lib/jspawnhelper 1081 Make the script executable: $ chmod 755 jdk-17.0.6.install-alternatives.sh This will pick all the executable files in your new Java package, even those under directories different from bin/ (i.e. Update-alternatives -install /usr/bin/$FN $FN $FP $PRIORITY ![]() With the following content, making sure you substitute the right values for the JAVADIR, PRIORITY and BINDIR variables according to your system's configuration: #!/bin/bashįind "$JAVADIR" -perm 755 -type f | while read FPĮcho "update-alternatives -install /usr/bin/$FN $FN $FP $PRIORITY" * 2 /usr/lib/jvm/java-8-oracle/jre/bin/java 1081 manual modeģ /usr/lib/jvm/jdk-13.0.2/bin/java 1081 manual modeĬreate the following script: $ sudo nano jdk-17.0.6.install-alternatives.sh There are 3 choices for the alternative java (providing /usr/bin/java).Ġ /usr/lib/jvm/java-8-oracle/jre/bin/java 1081 auto modeġ /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081 manual mode Let's suppose you've just installed JDK 17 on Ubuntu via a Debian package and you have this existing situation: $ update-alternatives -config java If you have no such file for your new JDK installation, you can create your own installation script as follows. I've checked the content of /usr/sbin/update-java-alternatives and it's just a script that calls update-alternatives for every entry in the file /usr/lib/jvm/.jinfo. ![]() (dot).īibliography man -S 8 update-java-alternatives In order to configure update-java-alternatives you must use a hidden file with the same name as your directory but prefixed by a. When all the alternatives are configured you can then create links in /usr/lib/jvm to your manual instalation. There is javadoc, rmic, serialver and others, substituting the above variables for: native2ascii and /opt/jdk1.8.0_40/bin/native2ascii should report if the alternative is installed and/or selected. You can, and really should, use both update-java-alternatives and update-alternatives together.įirstly, be sure to have the all the alternatives configured correctly. Update-alternatives is a symbolic link management system for linux (I'm sure there is little news here). Update-java-alternatives is a program to update alternatives for jre/jdk installations. And under Java -> Compiler you could choose an older Java compliance if you wish.ĮDIT: This DigitalOcean page also has a very nice explanation of everything related to Java on Ubuntu. I don't know how to do that for the Arduino IDE.įor 2.: In Eclipse you can select the JRE/JDK to be used in Window -> Preferences -> Java -> Installed JREs. As alternative, you configure alternatives without update-java-alternatives:įor example, to add java from jvm-directory /usr/lib/jvm/jdk-12.0.1 ( default directory of Debian package of Oracle) with priority 2082, use the following command: sudo update-alternatives -install /usr/bin/java java /usr/lib/jvm/jdk-12.0.1/bin/java 2082Īs for switching for different development environments:Īre you talking about starting the IDE itself with different Java versions or using different versions in the IDE for compilation and running your app?įor 1.: You can specify which JVM to use in the eclipse.ini, as described here. jinfo file, the jdk of Oracle (formerly Sun) is not. Update-java-alternatives requires presence of a file with extension. Using the first commands, you can use a Java VM and Java Compiler from different JDKs. However, using update-java-alternatives with a JDK Version changes both programs for me. I can see, that each command changes the program being used. If I check which version is being used by issuing the command You can also see that, because the first command lists a lot of "JRE" (Java Runtime Environment) folders and the Program is just called "java". ![]() Configures the default for the program "java". ![]()
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