java.io.IOException: Project folder is not writeable.
        at org.netbeans.api.project.ProjectManager.saveProject(ProjectManager.java:654)
        at org.netbeans.modules.j2ee.sun.ide.j2ee.BuildExtension.abbreviateBuildXml(BuildExtension.java:146)
        at org.netbeans.modules.j2ee.sun.ide.j2ee.ModuleConfigurationImpl$StaticBuildExtensionListener.rewriteBuildImpl(ModuleConfigurationImpl.java:356)
        at org.netbeans.modules.j2ee.sun.ide.j2ee.ModuleConfigurationImpl$StaticBuildExtensionListener.access$100(ModuleConfigurationImpl.java:316)
        at org.netbeans.modules.j2ee.sun.ide.j2ee.ModuleConfigurationImpl$StaticBuildExtensionListener$1.run(ModuleConfigurationImpl.java:412)
        at org.openide.util.Mutex.postRequest(Mutex.java:1251)
        at org.openide.util.Mutex.postWriteRequest(Mutex.java:582)
        at org.netbeans.modules.j2ee.sun.ide.j2ee.ModuleConfigurationImpl$StaticBuildExtensionListener.reactToInstanceChange(ModuleConfigurationImpl.java:396)
        at org.netbeans.modules.j2ee.sun.ide.j2ee.ModuleConfigurationImpl$StaticBuildExtensionListener.instanceAdded(ModuleConfigurationImpl.java:388)
        at org.netbeans.modules.j2ee.sun.ide.j2ee.ModuleConfigurationImpl.<init>(ModuleConfigurationImpl.java:128)
        at org.netbeans.modules.j2ee.sun.ide.j2ee.ModConFactory.create(ModConFactory.java:63)
        at org.netbeans.modules.j2ee.deployment.config.ConfigSupportImpl.getModuleConfiguration(ConfigSupportImpl.java:707)
        at org.netbeans.modules.j2ee.deployment.config.ConfigSupportImpl.ensureConfigurationReady(ConfigSupportImpl.java:216)
        at org.netbeans.modules.web.project.WebProject$ProjectOpenedHookImpl.projectOpened(WebProject.java:932)
        at org.netbeans.spi.project.ui.ProjectOpenedHook$1.projectOpened(ProjectOpenedHook.java:81)
        at org.netbeans.spi.project.ui.support.UILookupMergerSupport$OpenHookImpl.projectOpened(UILookupMergerSupport.java:193)
        at org.netbeans.spi.project.ui.ProjectOpenedHook$1.projectOpened(ProjectOpenedHook.java:81)
        at org.netbeans.spi.project.ui.support.UILookupMergerSupport$OpenHookImpl.projectOpened(UILookupMergerSupport.java:198)
        at org.netbeans.spi.project.ui.ProjectOpenedHook$1.projectOpened(ProjectOpenedHook.java:81)
        at org.netbeans.modules.project.ui.OpenProjectList.notifyOpened(OpenProjectList.java:1059)
        at org.netbeans.modules.project.ui.OpenProjectList.doOpenProject(OpenProjectList.java:1110)
        at org.netbeans.modules.project.ui.OpenProjectList.doOpen(OpenProjectList.java:663)
        at org.netbeans.modules.project.ui.OpenProjectList.access$1200(OpenProjectList.java:122)
        at org.netbeans.modules.project.ui.OpenProjectList$3.run(OpenProjectList.java:553)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:573)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1005)