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This bug was originally marked as duplicate of bug 215922, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE Dev (Build 20171006-unknown-revn) VM: Java HotSpot(TM) 64-Bit Server VM, 25.144-b01, Java(TM) SE Runtime Environment, 1.8.0_144-b01 OS: Windows 10 User Comments: GUEST: Changing platform from Java 8 to Java 9 Stacktrace: java.lang.AssertionError at org.netbeans.spi.project.support.ant.AntProjectHelper.save(AntProjectHelper.java:601) at org.netbeans.spi.project.support.ant.AntProjectHelper.access$100(AntProjectHelper.java:89) at org.netbeans.spi.project.support.ant.AntProjectHelper$1.save(AntProjectHelper.java:127) at org.netbeans.modules.project.ant.AntBasedProjectFactorySingleton.saveProject(AntBasedProjectFactorySingleton.java:406) at org.netbeans.modules.projectapi.nb.NbProjectManager$6.run(NbProjectManager.java:618) at org.netbeans.modules.projectapi.nb.NbProjectManager$6.run(NbProjectManager.java:608)
Created attachment 165271 [details] stacktrace