Looking at Plug Helper Maven versions, here
version 1.9.1 points to the parent POM org.codehaus.mojo.mojo-parent version 33 , which still sets its Java target to 1.5 (via the mojo.java.target property).
version 1.10 points to the parent POM org.codehaus.mojo.mojo-parent version 38 , which sets its Java target to 1.7
Therefore, Build Helper Maven Plugin 1.9.1 is the latest version compatible with Java 6 . Starting with this version, Java 7 is the default target.
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