[ BUILD # : 200510050715 ]
[ JDK VERSION : 1.4.2_xx ]

The following exception is thrown after every startup:

java.lang.NullPointerException
	at org.netbeans.modules.j2ee.deployment.devmodules.spi.J2eeModuleProvider.fireServerChange(J2eeModuleProvider.java:317)
	at org.netbeans.modules.j2ee.ejbjarproject.EjbJarProvider.propertyChange(EjbJarProvider.java:266)
	at org.netbeans.spi.project.support.ant.PropertyUtils$SequentialPropertyEvaluator.stateChanged(PropertyUtils.java:816)
	at org.openide.util.WeakListenerImpl$Change.stateChanged(WeakListenerImpl.java:278)
	at org.netbeans.spi.project.support.ant.ProjectProperties$3.run(ProjectProperties.java:308)
	at org.openide.util.Mutex.readAccess(Mutex.java:195)
	at org.netbeans.spi.project.support.ant.ProjectProperties$PP.fireChange(ProjectProperties.java:315)
	at org.netbeans.spi.project.support.ant.ProjectProperties$PP.put(ProjectProperties.java:186)
	at org.netbeans.spi.project.support.ant.ProjectProperties.putProperties(ProjectProperties.java:99)
	at org.netbeans.spi.project.support.ant.AntProjectHelper$9.run(AntProjectHelper.java:643)
	at org.openide.util.Mutex.writeAccess(Mutex.java:288)
	at org.netbeans.spi.project.support.ant.AntProjectHelper.putProperties(AntProjectHelper.java:641)
	at org.netbeans.modules.j2ee.ejbjarproject.ui.customizer.EjbJarProjectProperties$2.run(EjbJarProjectProperties.java:527)
	at org.openide.util.Mutex.writeAccess(Mutex.java:352)
	at org.netbeans.modules.j2ee.ejbjarproject.ui.customizer.EjbJarProjectProperties.setServerInstance(EjbJarProjectProperties.java:521)
	at org.netbeans.modules.j2ee.ejbjarproject.EjbJarProject$ProjectOpenedHookImpl.projectOpened(EjbJarProject.java:722)
	at org.netbeans.spi.project.ui.ProjectOpenedHook$1.projectOpened(ProjectOpenedHook.java:50)
	at org.netbeans.modules.project.ui.OpenProjectList.notifyOpened(OpenProjectList.java:417)
	at org.netbeans.modules.project.ui.OpenProjectList.getDefault(OpenProjectList.java:126)
	at org.netbeans.modules.project.ui.OpenProjectsTrampolineImpl.<init>(OpenProjectsTrampolineImpl.java:35)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
	at java.lang.Class.newInstance0(Class.java:308)
	at java.lang.Class.newInstance(Class.java:261)
	at org.openide.util.lookup.MetaInfServicesLookup$P.getInstance(MetaInfServicesLookup.java:406)
	at org.openide.util.lookup.AbstractLookup.lookup(AbstractLookup.java:344)
	at org.openide.util.lookup.ProxyLookup.lookup(ProxyLookup.java:180)
	at org.netbeans.modules.project.uiapi.Utilities.getOpenProjectsTrampoline(Utilities.java:50)
	at org.netbeans.api.project.ui.OpenProjects.<init>(OpenProjects.java:52)
	at org.netbeans.api.project.ui.OpenProjects.<clinit>(OpenProjects.java:47)
	at org.netbeans.modules.editor.bookmarks.EditorBookmarksModule.restored(EditorBookmarksModule.java:80)
	at org.netbeans.core.startup.NbInstaller.loadCode(NbInstaller.java:355)
	at org.netbeans.core.startup.NbInstaller.load(NbInstaller.java:271)
	at org.netbeans.ModuleManager.enable(ModuleManager.java:897)
	at org.netbeans.core.startup.ModuleList.installNew(ModuleList.java:377)
	at org.netbeans.core.startup.ModuleList.trigger(ModuleList.java:311)
	at org.netbeans.core.startup.ModuleSystem.restore(ModuleSystem.java:243)
	at org.netbeans.core.startup.Main.getModuleSystem(Main.java:202)
	at org.netbeans.core.startup.Main.start(Main.java:363)
	at org.netbeans.core.startup.TopThreadGroup.run(TopThreadGroup.java:90)
[catch] at java.lang.Thread.run(Thread.java:534)

I have four projects loaded:
- EJB Project
- ENterpise project
- J2EE Web project
- Standard Web project