Check java version without java -version
Solution 1:
To show what version of Java is installed without running java -version
, open the terminal and type:
apt policy openjdk-* oracle-java*
A small part of the results of apt policy openjdk-*
looks like this:
openjdk-7-jre-lib:
Installed: (none)
Candidate: (none)
Version table:
openjdk-8-jdk:
Installed: 8u162-b12-0ubuntu0.16.04.2
Candidate: 8u162-b12-0ubuntu0.16.04.2
Search for sections that contain either openjdk-*-jre
, openjdk-*-jdk
or oracle-java*
where the wildcard *
character can be a Java version number like 6, 7, 8 or 9.
Solution 2:
You can discover the full path of the default java
executable with:
readlink -f "$(which java)"
All (sane) Java packages or bundles that I know use installation path names that include the vendor name and major version number which would answer your question. E. g. on my system
$ readlink -f "$(which java)"
/usr/lib/jvm/java-9-openjdk-amd64/bin/java
tells me that the default Java installation is OpenJDK 9.
Solution 3:
You could also try:
dpkg -l | egrep -i 'jre|java|jdk'
Solution 4:
You can use this command for checking your java version:
update-alternatives --config java