Recompile Error

[KiMaster]

Hey, I'm somewhat new to Java and basically completely new to Forge Modding, so forgive me if this is a beginner mistake or a stupid question. I'm getting the following error when I run setupDecompWorkspace and am not sure how to fix it. I have a hunch, but I want to check here before I accidentally make things worse. 

To honour the JVM settings for this build a new JVM will be forked. Please consi
der using the daemon: https://docs.gradle.org/2.14/userguide/gradle_daemon.html.

This mapping 'snapshot_20171003' was designed for MC 1.12! Use at your own peril
.
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         ForgeGradle 2.3-SNAPSHOT-5ce6d6f3
  https://github.com/MinecraftForge/ForgeGradle
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                 Powered by MCP
             http://modcoderpack.com
     by: Searge, ProfMobius, R4wk, ZeuX
     Fesh0r, IngisKahn, bspkrs, LexManos
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:deobfCompileDummyTask
:deobfProvidedDummyTask
:getVersionJson
:extractUserdev UP-TO-DATE
:extractDependencyATs SKIPPED
:extractMcpData SKIPPED
:extractMcpMappings SKIPPED
:genSrgs SKIPPED
:downloadClient SKIPPED
:downloadServer SKIPPED
:splitServerJar SKIPPED
:mergeJars SKIPPED
:deobfMcSRG SKIPPED
:decompileMc SKIPPED
:fixMcSources
:applySourcePatches
:remapMcSources
: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 "C:\Program Files\Java\jre1.8.0_171"

* 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: 56.822 secs

 

[DaemonUmbra]

You need a JDK, you pointed your IDE at a JRE and said "Here's my JDK"

[KiMaster]

That's what I figured, I just wanted to make sure before changing anything, for fear of making the problem worse. Thank you!