+ ./gradlew setupDecompWorkspace build
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:deobfCompileDummyTask
:deobfProvidedDummyTask
:getVersionJson
:extractUserdev UP-TO-DATE
:extractMcpData SKIPPED
:extractMcpMappings SKIPPED
:genSrgs SKIPPED
:downloadClient SKIPPED
:downloadServer SKIPPED
:splitServerJar SKIPPED
:mergeJars SKIPPED
:deobfMcSRG SKIPPED
:getFernFlower SKIPPED
:decompileMc SKIPPED
:fixMcSources SKIPPED
:applySourcePatches SKIPPED
:remapMcSources SKIPPED
:recompileMc FAILED

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-7-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: 33.209 secs
Build step 'Execute shell' marked build as failure
Archiving artifacts
Finished: FAILURE