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i run ubuntu 16.04 and i am trying to execute 'minecraft.jar' located at my desktop. i right click and choose to open it using 'JDK java 8 runtime' but no luck. i then try to execute from the terminal: 

s@s-Inspiron-3543:~/Desktop$ java -jar Minecraft.jar

and get the following message: 

The program 'java' can be found in the following packages:
* default-jre
* gcj-5-jre-headless
* openjdk-8-jre-headless
* gcj-4.8-jre-headless
* gcj-4.9-jre-headless
* openjdk-9-jre-headless
Try: sudo apt install <selected package>

so, i installed and again i get the same... when i check for the java version:

 s@s-Inspiron-3543:~$ update-java-alternatives -l

i get either

java-1.8.0-openjdk-amd64    1081  /usr/lib/jvm/java-1.8.0-openjdk- amd64

or if i use the 'java version' again i am told where to install it from...

any ideas???

thanks in advance : )

brane stormer
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1 Answers1

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Java 9, OpenJDK or otherwise, is still under development, last I checked, and is very likely to be buggy - it's very very likely this is due to you using Java 9 and not a Stable Release of Java (such as Java 8).

Consider switching back to Java 8, and not use Java 9 since it's still in 'development' and not yet released. (This applies to Oracle Java as well).

Failing that, remove all Java packages, and try reinstalling them all with:

sudo apt-get install -y openjdk-8-jre openjdk-8-jdk

... which should install all the Java 8 files again and make it usable once again.

Thomas Ward
  • 78,878