Unable to locate the Javac Compiler when compiling with maven - Unable to locate the Javac Compiler in:

Question

I have compilation error on compiling with maven.

[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] Unable to locate the Javac Compiler in:
  C:\Program Files\Java\jre1.6.0_05\..\lib\tools.jar

So I set JAVA_HOME environment variable but no advantage. The error seems maven search java compiler in jre path, not in JAVA_HOME.

• JAVA_HOME is C:\Program Files\Java\jdk1.6.0_05.

• Installed JRE is C:\Program Files\Java\jre1.6.0_05.

• My PATH variable is:

C:\Program Files\PC Connectivity Solution\;D:\alfrescoplatform\ImageMagick;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\system32\Wbem;C:\Program Files\ImageMagick-6.7.3-Q16;C:\Program Files\Java\jdk1.6.0_05\bin

Here is my detail log

[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building SpringMVC Maven Webapp 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-resources-plugin:2.4.3:resources (default-resources) @ SpringMVC ---
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 0 resource
[INFO] 
[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ SpringMVC ---
[WARNING] File encoding has not been set, using platform encoding Cp1252, i.e. build is platform dependent!
[INFO] Compiling 2 source files to D:\Learning\spring-workspace\SpringMVC2.5.6\target\classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] Unable to locate the Javac Compiler in:
  C:\Program Files\Java\jre1.6.0_05\..\lib\tools.jar
Please ensure you are using JDK 1.4 or above and
not a JRE (the com.sun.tools.javac.Main class is required).
In most cases you can change the location of your Java
installation by setting the JAVA_HOME environment variable.
[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.719s
[INFO] Finished at: Thu Nov 01 17:22:43 MMT 2012
[INFO] Final Memory: 4M/8M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project SpringMVC: Compilation failure
[ERROR] Unable to locate the Javac Compiler in:
[ERROR] C:\Program Files\Java\jre1.6.0_05\..\lib\tools.jar
[ERROR] Please ensure you are using JDK 1.4 or above and
[ERROR] not a JRE (the com.sun.tools.javac.Main class is required).
[ERROR] In most cases you can change the location of your Java
[ERROR] installation by setting the JAVA_HOME environment variable.
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

If you have any idea about this, let me know.

Answer 1

Your JAVA_HOME is C:\Program Files\Java\jdk1.6.0_05

Way 1: The following steps would work for Eclipse:

1. Go to Window -> Preferences -> Java -> installed JREs
   
2. Edit the existing JRE location as: Set JRE Home = JAVA_HOME or JAVA_HOME\jre (In your case the path should be C:\Program Files\Java\jdk1.6.0_05 OR C:\Program Files\Java\jdk1.6.0_05\jre)
   
3. Click Finish and OK button

Way 2: Another way to set the JRE System Library:

1. Open eclipse and Right click on Eclipse project Properties
   
2. Java Build Path -> Libraries
   
3. Select JRE System Library -> Click Edit button
   
4. Click "Installed JREs..." button
   
5. Edit JRE as: Set JRE Home = JAVA_HOME or JAVA_HOME\jre

Way 3: The following steps should also work well:

1. Go to Window -> Preferences -> Java -> installed JREs
2. Select the JRE you are using
3. Press Edit -> Add External JARs...
4. Browse to Java\jdk1.6.0_05\lib and select tools.jar and Press Enter
5. Click Finish and OK button