findbugs-maven-plugin to use Groovy 2.4.9
findbugs-maven-plugin to use Groovy 2.4.9

Fixes "mvn verify" failure seen w/ Groovy 2.4.7 and Java 9-ea+160:

[ERROR] Failed to execute goal org.codehaus.mojo:findbugs-maven-plugin:3.0.4:findbugs (findbugs) on project super-project: Execution findbugs of goal org.codehaus.mojo:findbugs-maven-plugin:3.0.4:findbugs failed: No signature of method: java.io.File.exists() is applicable for argument types: () values: []
[ERROR] Possible solutions: write(java.lang.String), print(java.io.PrintWriter), print(java.lang.Object), with(groovy.lang.Closure), is(java.lang.Object), printf(java.lang.String, [Ljava.lang.Object;)

acegi/acegi-standard-project