[INFO] Scanning for projects...
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[INFO] Building GWT Maven Archetype 4.0.3-dev
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[INFO] 
[INFO] --- gwt-maven-plugin:2.4.0:i18n (default) @ cmj4-web ---
[WARNING] Don't declare gwt-dev as a project dependency. This may introduce complex dependency conflicts
[INFO] 
[INFO] --- maven-resources-plugin:2.4.3:resources (default-resources) @ cmj4-web ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 3 resources
[INFO] 
[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ cmj4-web ---
[INFO] Compiling 1 source file to D:\WorkSoft\cmj-web\target\cmj4-web\WEB-INF\classes
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[ERROR] COMPILATION ERROR : 
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[ERROR] Unable to locate the Javac Compiler in:
  C:\Program Files\Java\jre7\..\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] -------------------------------------------------------------
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[INFO] BUILD FAILURE
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[INFO] Total time: 3.080s
[INFO] Finished at: Thu Jan 12 13:30:33 AST 2012
[INFO] Final Memory: 18M/220M
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[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project cmj4-web: Compilation failure
[ERROR] Unable to locate the Javac Compiler in:
[ERROR] C:\Program Files\Java\jre7\..\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