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At least on my laptop, github.com/jenkinsci/jenkins/core/src/main/java/ takes more than 5s to compile, so NB starts trying to rescan the classpath (due to changes in generated sources) while the Maven build is still actually writing out class files, which causes unnecessary contention and sometimes compile-on-save mayhem. Would be better to make this delay longer by default, and configurable.
Created attachment 163785 [details] Proposed patch (not yet tested)
cf. #227791
https://github.com/apache/incubator-netbeans/pull/503