We have a java maven project with spock tests. The tests are located in src/test/groovy. We used to be able to run these tests in Eclipse with org.codehaus.groovy.m2eclipse_2.9.2.xx-201604081629-e45 installed. When we updated this plugin to org.codehaus.groovy.m2eclipse_2.9.2.xx-201607251752-e45 no longer we can run the tests. Today I've noticed that the problem is even when running Update Maven Project action (Alt+F5). Whenever the action is ran the source folder src/test/groovy disappears from the classpath.