I'm not sure which version of java I have, and would like to know if there is a command to see the version of java that is installed and active. Also, which version works best? All this on 32bit …

2016年3月1日 · Apt-get won't overwrite the existing java versions. To switch between installed java versions, use the update-java-alternatives command. List all java versions: update-java …

2012年4月13日 · I actually have version 6.22 of java and would like to update to version 6.30. So after moving the extracted directory java-6-oracle into /usr/lib/jvm I do not know what to do, …

2018年4月13日 · I have about 35 different JREs installed in various nonstandard paths on a Linux server, but I cannot execute java -version as they are owned by other users. I also cannot run …

2016年5月14日 · PPAs such as 'ppa:webupd8team/java' used in many Java installation tutorials now become unavailable. Here I would like to share how I installed Java 8 on Ubuntu 16.04, and …

2016年9月24日 · You can write a simple bash script to check this out: Open any text editor (preferrably vim or emacs). create a file named script.sh (or any name with the .sh extension). …

2021年5月7日 · Since you have previously checked with whereis whether your binary is installed, now you can check if it can be executed properly : does its location belong to your PATH …

2022年1月10日 · When you called java from Windows, it was smart enough to add the .exe, and run the Windows copy of Java. But, when you switched to WSL, when you typed java, it ran the …

However, using update-java-alternatives with a JDK Version changes both programs for me. Using the first commands, you can use a Java VM and Java Compiler from different JDKs. update …

2016年2月17日 · Should I remove the old java? I don't want it to interfere with the new one, and the system is low on memory. Will it have any effect on the Ubuntu if I remove it?