Checkstyle is configured to run in the validation phase in spring-data-parent, spring-data-neo4j used to use validate as well. Also, spring-data-neo4j has checkstyle configured to check the test sources as well. The later is done in test-compile.
So checkstyle was executed indeed twice during validation, once for the sources and once for the test-compile.
This commit changes spring-data-neo4j’s configuration to run in verify, after tests ran. This makes checkstyle only run once.
For a quick look if all sources are correct, one can use ` ./mvnw checkstyle:check@verify` before running a full blown `./mvnw verify`. While the Java compiler now can flag invalid code immediate, checkstyle will discover the rest only afterwards.
While working on this a flaw in the combine.self="override" attribute was discovered: It works of course only for the maven configurational attributes, not for the checkstyle rules themselve. Therefor the `io.spring.nohttp.checkstyle.check.NoHttpCheck` has been added to the local configuration as well.
In the process of the bug fix, the sort pom plugin has been applied with the configuration as already available.
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