title: Maven package (build error) while building project
body: <p>I am using Springs for development. And I am using eclipse.Earlier my project was getting built successfully but as I pasted some more files in my application in some packages I am getting following error when I say Run as "Maven Package". I am not understanding why is this error getting in between some times.</p>
  
  <p>I get following error when I say Run as Maven package</p>
  
  <pre><code>[INFO] Scanning for projects...
  [INFO]                                                                         
  [INFO] ------------------------------------------------------------------------
  [INFO] Building HeyLets 0.8-SNAPSHOT
  [INFO] ------------------------------------------------------------------------
  [INFO] 
  [INFO] --- maven-resources-plugin:2.4.3:resources (default-resources) @ HeyLets ---
  [WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
  [INFO] Copying 2 resources
  [INFO] 
  [INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ HeyLets ---
  [WARNING] File encoding has not been set, using platform encoding Cp1252, i.e. build is platform dependent!
  [INFO] Compiling 1 source file to D:\temp\temp_wsp\HeyLetsNew\target\classes
  [INFO] -------------------------------------------------------------
  [ERROR] COMPILATION ERROR : 
  [INFO] -------------------------------------------------------------
  [ERROR] Unable to locate the Javac Compiler in:
    C:\Program Files\Java\jre6\..\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: 2.156s
  [INFO] Finished at: Fri Feb 25 11:04:37 IST 2011
  [INFO] Final Memory: 3M/15M
  [INFO] ------------------------------------------------------------------------
  [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project HeyLets: Compilation failure
  [ERROR] Unable to locate the Javac Compiler in:
  [ERROR] C:\Program Files\Java\jre6\..\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] -&gt; [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
  </code></pre>