[linux] JAVA_HOME is set but gradlew doesn't use it

[KeeganDeathman]

Okay this is a weird one.

I'm running linux mint on this machine and whilst running setupDecompWorkspace I get the error

Unable to find a javac compiler;
  com.sun.tools.javac.Main is not on the classpath.
  Perhaps JAVA_HOME does not point to the JDK.
  It is currently set to "/usr/lib/jvm/java-8-openjdk-amd64/jre"

buuuuuutttt

echo $JAVA_HOME
/home/keegand/Downloads/jdk1.8.0_171

why isn't using the proper value? I'd really like it to. Any help?

[DaemonUmbra]

Have you rebooted your PC since setting the variable?

[desht]

  On 8/14/2018 at 6:03 PM, DaemonUmbra said:

Have you rebooted your PC since setting the variable?

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This is Linux. We don't reboot after setting one little variable

 

Have you exported the environment variable, @KeeganDeathman? Looks like your shell sees the var but the gradle process doesn't, which suggest the variable isn't exported. 

[JaredBGreat]

I also use Linux.  While I had a lot of trouble getting things going back in 1.5.2 days, I've never seen this problem.  Then, I installed Oracle Java and don't use gradlew since I've actually installed Gradle as well.  Perhaps installing Orcale Java and Gradle would help?

 

  Quote

sudo add-apt-repository ppa:webupd8team/java

sudo apt-get update

sudo apt-get install oracle-java8-installer

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Will get you Oracle Java, instead of the OpenJDK (which I find to be more buggy).

[crackedEgg]

You might try checking which java version the OS has set. If you are using Ubuntu/Fedora/Debian you would use "update-alternatives" to check/set the java version. Archlinux you would use archlinux-java command to check/set the java version.

Also I use OpenJDK and have no issues. I used to have and issue now and then early on, but so far its been as stable as the Oracle version.

[Avanyt]

MAKE SURE ITS Java 8

 

(User Variable)

set JAVA_HOME C:\Program Files\Java\jdk1.8.0_181

set PATH C:\Program Files\Java\jdk1.8.0_181\bin

 

(System Variable)

set JAVA_HOME C:\Program Files\Java\jdk1.8.0_181

Click on path edit add C:\Program Files\Java\jdk1.8.0_181\bin

 

[DaemonUmbra]

  On 8/16/2018 at 9:04 PM, Avanyt said:

(User Variable)

set JAVA_HOME C:\Program Files\Java\jdk1.8.0_181

set PATH C:\Program Files\Java\jdk1.8.0_181\bin

 

(System Variable)

set JAVA_HOME C:\Program Files\Java\jdk1.8.0_181

Click on path edit add C:\Program Files\Java\jdk1.8.0_181\bin

Expand  

  On 8/16/2018 at 7:01 PM, desht said:

This is Linux.

Expand  

I'm not a Linux wizard (as evidenced above), but I'm fairly certain Linux doesn't have drive letters

[DaemonUmbra]

What I had meant about rebooting the PC was not just to make sure the variable was set, but also to make sure Gradle restarted and got a fresh environment as well.

[KeeganDeathman]

I figured it out but forgot how I did it...

[homosapien97]

I'm having this same issue--on Ubuntu, have java 11 & 8 installed, switched to java 8 with 

sudo update-java-alternatives --set /usr/lib/jvm/java-1.8.0-openjdk-amd64
export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64/jre/

Tried running 

./gradlew setupDecompWorkspace

But got 

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':recompileMc'.
> Unable to find a javac compiler;
  com.sun.tools.javac.Main is not on the classpath.
  Perhaps JAVA_HOME does not point to the JDK.
  It is currently set to "/usr/lib/jvm/java-8-openjdk-amd64/jre"

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 16.924 secs

I tried with --debug and --stacktrace but didn't get anything particularly useful.

Anyone else run across this and remember how to fix it?