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Gradlew unable to find a javac compiler

So I am trying to create a Workspace for eclipse from gradlew. And I am getting the following error:
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_131"
But I`ve set JRE_HOME and JAVA_HOME correctly(JAVA_HOME points to jdk folder and JRE_HOME to jre folder). But gradlew sees wrong jdk path. What may caurse this problem?

It is currently set to "C:\Program Files\Java\jre1.8.0_131"
That means you do not have a JDK installed, but a JRE, meaning, you only have the runtime environment but not the development kit that contains the compiler.
Install a Java JDK and set the environment accordingly.

Netbeans - Use correct JRE for debugging on Kubuntu

I know this question has been asked before, but the solutions do not work.
I've installed a new jdk 1.8 and configured it as platform. In netbeans.conf I've configured netbeans_jdkhome="/home/niklas/Java/jdk1.8.0_65/".
using update-alternatives I've configured the new jre for java. java -version correctly returns "java version "1.8.0_65"
Nevertheless running my project from inside netbeans it does not load, instead the "javafx requires newer version" error appears.
When I run exactly the same project with java -jar it runs correctly.
What did I forget to configure?

After long try-and-error here my solution:
the standard ubuntu package seems not to contain javafx. Therefore netbeans has to be installed from netbeans downloadpage.
Step-by-step solution:
Uninstall netbeans (e.g. sudo apt-get remove netbeans)
Download netbeans-8.1-javase-linux.sh
Run sh netbeans-8.1-javase-linux.sh --javahome /[PATH_TO_JDK]/jdk1.8.0_[VERSION] (note that this installer fails without warning if you use [PATH_TO_JDK]/jre/)
Edit [INSTALLATION_DIR]/etc/netbeans.conf
Make sure netbeans_jdkhome="[PATH_TO_JDK]" points to the right path (it didn't in my case.) and has no # before
note that the "All"-linux installer from the downloadpage is broken today (11.11.2015). Maybe this will be fixed soon.

IntelliJ IDEA can't run application with JDK

When I run my web application with Tomcat, I get an error as follow:
Caused by: 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 "D:\jdk1.7.0_60\jre"
I set JAVA_HOME in Configuration, but unfortunately no effect.
SDKs setting in Project Structure:
========================================================
Problem has been solved!
Application get exception when doing Ant javac task, set the "fork" property true then it find extJavac.
Appreciate #Michael Hobbs and #Dimitri Hautot.

JRE means "Java Runtime Environment". There is no javac compiler in it.
The JRE is actually a subfolder of the JDK (Java Development Kit, where the compiler is).
Make sure your paths are correctly set in IntelliJ settings, and refer to the JDK, not the JRE.
EDIT: looking at the proposed path, all starting with "D:\jdk1.7.0_60\jre", maybe you installed a JRE on your computer, instead of a JDK. This might be the cause of the problem.

Project Structure -> SDK does not effect JAVA_HOME. This must be set in the OS. I'm surprised IntelliJ, ran with a JAVA_HOME issues. Should be something alone the lines of:
Linux shell export JAVA_HOME=/home/michael/jdk1.7.0_65
Windows How to set java_home on Windows 7?

"Unable to find a javac compiler" - while trying to generate an android app with RoboHelp 10

I am exploring a trial version of Adobe's Technical Communication Suite. Following this video, I am trying to generate an Android app using a sample document.
I've tried changing the file paths for the JDK and apache.ant files, but keep receiving the same error message (see below).
BUILD FAILED
C:\Program Files (x86)\Android\adt-bundle-windows-x86_64-20130522\sdk\tools\ant\build.xml:713: The following error occurred while executing this line:
C:\Program Files (x86)\Android\adt-bundle-windows-x86_64-20130522\sdk\tools\ant\build.xml:727: 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 (x86)\Java\jre7"

I got the same error but in a linux system and solved it by knowing that: JDK is a super command for JRE.
JRE: Java Runtime Environment only runs not compile or build (eg. using ant).
JDK: compiles and runs.
So try changing your java setting to JAVA_HOME= ..../java OR .../jdk not .../jre.

It seems that you didn't configure your JAVA variable environment.
BTW, I don't know what IDE you are using. As far as I know, if you have more than one java versions in your computer, in eclipse you should set variables.
(1) window->preference-> left column (Java)->Compiler, you could change different compiler version.
(2) And in left column (Java) -> Installed JRE, you should also modify the JRE version.

JAVA_HOME does not point to the JDK : Unable to start google app engine

I get the following errors when i try to run a sample project in netbeans on google app server. The server doesn't start up. How can i resolve these errors if they exist ? I am using netbeans 7.1
BUILD FAILED
W:\UnderTest\NetbeansCurrent\Guestbook\nbproject\build-impl.xml:550: The following error occurred while executing this line:
W:\UnderTest\NetbeansCurrent\Guestbook\nbproject\build-impl.xml:300: 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\jre7"

Install jdk and set JAVA_HOME in environments variables to path that you jdk was installed. Currently it points to jre.

probable solution will be hear : setting jdk path in netbeans
or , if you setting JAVA_HOME in windows env then use %JAVA_HOME%