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.

(And you definitely started a *new* command window after setting `JAVA_HOME`, right?) — Duncan Jones, Nov 01 '12 at 11:29

Ripon Al Wasim · Answer 1 · 2015-04-29T12:18:45.070

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

Way 1: The following steps would work for Eclipse:

Go to Window -> Preferences -> Java -> installed JREs
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)
Click Finish and OK button

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

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

Way 3: The following steps should also work well:

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

score 0 · Answer 2 · answered Nov 01 '12 at 11:48

0

Try to add vm argument to your eclipse.ini file.

-vm
C:\Program Files\Java\jdk1.6.0_05\bin\javaw.exe

answered Nov 01 '12 at 11:48

Aleksandr M

24,264
12
69
143

score 0 · Answer 3 · edited May 23 '17 at 12:14

I had exact same problem, tried these solutions with no success:

What worked for me:

click the little down arrow next to the green run button
select Run Configurations
on the JRE tab, select Alternate JRE, then select your desired target (if it's not on the list, click Installed JREs to add it in).

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

3 Answers3