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User can easily setup cyclic project dependencies and let Ant loop "inifinitelly". For J2ME project (where some project queries are forwarded) this can easily cause out of memory errors or other strange exceptions. It is not problem to detect the cycles in each project type during each critical action but there is missing at least some common UI to display warning. Currently J2ME project detect cycle during project dependencies resolution in customizer and during each query for sources and javadoc. Singleton dialog with warning and list of involved projects is displayed in case of cycle detection. If you decide to detect the cycles and show the warning in project infrastructure trasparently to project types, I'll remove our UI. Otherwise the warning dialog needs to be common and have some public API.
Will leave this method to represent need for e.g. a utility method in ProjectUtils to ensure that a proposed addition to the set of subprojects for a given project will not cause a cycle. Don't bother trying to detect cycles in random queries etc.; better to prevent them from occurring to begin with. See also issue #43848 (java/j2seproject) and issue #43849 (web/project).
committed * Up-To-Date 1.3 projects/projectapi/src/org/netbeans/api/project/ProjectUtils.java committed * Up-To-Date 1.5 projects/projectapi/src/org/netbeans/spi/project/SubprojectProvider.java added * Up-To-Date 1.1 projects/projectapi/test/unit/src/org/netbeans/api/project/ProjectUtilsTest.java