Re: java, javac versions not the same, apt-get doesn't help ...

[Bastien Durel <bastien@durel.org>]

Le vendredi 12 janvier 2018 à 04:20 -0500, Albretch Mueller a écrit :
> java gives you error messages when you compile and run code with
> different versions of the JVM
> 
> while trying to update my box using apt-get I am getting:
> "openjdk-8-jdk is already the newest version."
> 
> How do you make sure you install the same version of both java and
> javac using apt-get?
> 
> lbrtchx
> ~
> $ uname -a
> Linux IBMThnkPdT60 3.16.0-4-686-pae #1 SMP Debian 3.16.36-1+deb8u1
> (2016-09-03) i686 GNU/Linux
> 
> $ java -version
> openjdk version "1.8.0_131"
> OpenJDK Runtime Environment (build 1.8.0_131-8u131-b11-1~bpo8+1-b11)
> OpenJDK Server VM (build 25.131-b11, mixed mode)
> 
> $ javac -version
> javac 1.7.0_111
> 
> 
> # _LOG_FL="openjdk-8-jdk_install_$(date +%Y%m%d%H%M%S).log"
> 
> # uname -a >> "${_LOG_FL}" 2>&1
> 
> # time(apt-get -V install openjdk-8-jdk) >> "${_LOG_FL}" 2>&1
> 
> # cat openjdk-8-jdk_install_20180112040601.log
> Linux IBMThnkPdT60 3.16.0-4-686-pae
> #1 SMP Debian 3.16.36-1+deb8u1 (2016-09-03) i686 GNU/Linux
> 
> Reading package lists...
> Building dependency tree...
> Reading state information...
> openjdk-8-jdk is already the newest version.
> 0 upgraded, 0 newly installed, 0 to remove and 365 not upgraded.
> 
> real    0m3.571s
> user    0m0.672s
> sys     0m0.092s
> 
> # java -version
> openjdk version "1.8.0_131"
> OpenJDK Runtime Environment (build 1.8.0_131-8u131-b11-1~bpo8+1-b11)
> OpenJDK Server VM (build 25.131-b11, mixed mode)
> 
> # javac -version
> javac 1.7.0_111
> 
You d'like to look at your alternatives

$ ls -l /etc/alternatives/java*
lrwxrwxrwx 1 root root 46 juil.  2  2017 /etc/alternatives/java ->
/usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java
lrwxrwxrwx 1 root root 56 juil.  2  2017 /etc/alternatives/java.1.gz ->
/usr/lib/jvm/java-8-openjdk-amd64/jre/man/man1/java.1.gz
lrwxrwxrwx 1 root root 39 déc.  14  2010 /etc/alternatives/java_vm ->
/usr/lib/jvm/java-6-sun/jre/bin/java_vm
lrwxrwxrwx 1 root root 38 déc.  14  2010 /etc/alternatives/javaws ->
/usr/lib/jvm/java-6-sun/jre/bin/javaws
lrwxrwxrwx 1 root root 48 déc.  14  2010 /etc/alternatives/javaws.1.gz
-> /usr/lib/jvm/java-6-sun/jre/man/man1/javaws.1.gz

On this box, java and javaws use different java versions
You can set them using update-alternatives(1) -- or update-java-
alternatives(8) for java

-- 
Bastien