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This bug was originally marked as duplicate of bug 202143, 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 201407030001) VM: Java HotSpot(TM) 64-Bit Server VM, 25.5-b02, Java(TM) SE Runtime Environment, 1.8.0_05-b13 OS: Windows 7 User Comments: GUEST: New ear project - maven archytype Stacktrace: java.lang.NullPointerException: The j2ee.server.instance parameter cannot be null at org.openide.util.Parameters.notNull(Parameters.java:89) at org.openide.util.EditableProperties.put(EditableProperties.java:245) at org.openide.util.EditableProperties.setProperty(EditableProperties.java:277) at org.netbeans.spi.project.support.ant.EditableProperties.setProperty(EditableProperties.java:162) at org.netbeans.modules.j2ee.earproject.EarProject$JavaEEProjectSettingsImpl.setInProperties(EarProject.java:888) at org.netbeans.modules.j2ee.earproject.EarProject$JavaEEProjectSettingsImpl.setInPrivateProperties(EarProject.java:881)
Created attachment 147902 [details] stacktrace
reassigning for further evaluation
Seems to me to be a Maven support issue...
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss