java.lang.NoClassDefFoundError: org/apache/tools/ant/util/ReaderInputStream vaadin+gradle+intelliJ

gradle intellij-idea vaadin

I have been working fine with Vaadin + Gradle + IntelliJ until yesterday night when I introduced SLF4J(logback) logging to my application. Since then I can't make my project anymore due to classDefFoundError of org/apache/tools/ant/util/ReaderInputStream.

I can't link it with any transitive dependency of any contained jar in application, but even if I remove SLF4J libraries I still can't make my application, so I am wondering what changed?

I am using vaadin gradle plugin 0.9.5 and gradle 2.2.1. Has anyone ever encountered this problem? I was reading another post where someone had the same issue, but the solution he proposed is not valid to my application. He proposed to comment some of the lines in vaadin.gradle, which my application doesn't have.


Try

File > Invalidate Caches / Restart...


I deleted the .idea folder and that worked for me.

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