Its about gradlew and java. I don't know what to do

[RaziphoN]

gradlew setupDecompWorkspace --refresh-dependencies
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:extractMcpData
:getVersionJson
:extractUserDev
:genSrgs SKIPPED
:extractNatives
:getAssetsIndex
:getAssets
:makeStart FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':makeStart'.
> 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 "C:\Program Files\Java\jre1.8.0_66"
* 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: 1 mins 25.179 secs

[liach]

Your java home points to the jre. You should change your system variable to make it point to the jdk.