Caused by: org.apache.maven.plugin.PluginExecutionException: Execution enforce of goal org.apache.maven.plugins:maven-enforcer-plugin:1.3:enforce fail
ed.
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:110)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
        ... 19 more
Caused by: java.lang.NullPointerException
        at org.apache.maven.plugins.enforcer.EnforceBytecodeVersion.isBadArtifact(EnforceBytecodeVersion.java:147)
        at org.apache.maven.plugins.enforcer.EnforceBytecodeVersion.checkDependencies(EnforceBytecodeVersion.java:134)
        at org.apache.maven.plugins.enforcer.AbstractBanDependencies.execute(AbstractBanDependencies.java:93)
        at org.apache.maven.plugins.enforcer.EnforceBytecodeVersion.execute(EnforceBytecodeVersion.java:93)
        at org.apache.maven.plugins.enforcer.EnforceMojo.execute(EnforceMojo.java:179)
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
        ... 20 more
[ERROR]
[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/PluginExecutionException