org.codehaus.plexus.util.dag.CycleDetectedException: Edge between 'Vertex{label='org.apache.maven.plugins:maven-changes-plugin:2.2-SNAPSHOT'}' and 'Vertex{label='org.apache.maven.plugins:maven-changes-plugin:2.2-SNAPSHOT'}' introduces
to cycle in the graph org.apache.maven.plugins:maven-changes-plugin:2.2-SNAPSHOT --> org.apache.maven.plugins:maven-changes-plugin:2.2-SNAPSHOT
at org.codehaus.plexus.util.dag.DAG.addEdge(DAG.java:127)
at org.codehaus.plexus.util.dag.DAG.addEdge(DAG.java:107)
at org.apache.continuum.utils.ProjectSorter.getSortedProjects(ProjectSorter.java:93)
at org.apache.maven.continuum.DefaultContinuum.getProjectsInBuildOrder(DefaultContinuum.java:1228)
at org.apache.maven.continuum.DefaultContinuum.createProjectScmRootForProjectGroup(DefaultContinuum.java:3485)
at org.apache.maven.continuum.DefaultContinuum.initialize(DefaultContinuum.java:2468)
prevent cycle from causing failures, and instead return a mostly sorted list. Continuum doesn't need failures on cycles.