I use WebModuleFixtureBuilder all the time to test my plugin. In some of my tested code i have stuff like: WebUtil.getWebFacet(myFile, myProject) which simply throws this exception when i run it from my unit tests: java.lang.NullPointerException at com.intellij.javaee.web.WebUtil.getWebFacet(WebUtil.java:72) i'm guessing that it's because the JavaeeFacetUtil service hasn't been registered. As this is a static call i can't mock this call out so a workaround for this would be great.