Reproduce:
* Create Java Application Project
* Add a class to the project
* RE the project

Result: 
On unix based machines, the model is empty. On solaris the following exception is thrown.

java.io.FileNotFoundException: /home/gvasick/.netbeans/dev/.uml/config/UML_2.0EMBT.dtd (No such file or directory)
        at java.io.FileInputStream.open(Native Method)
        at java.io.FileInputStream.<init>(FileInputStream.java:106)
        at org.netbeans.modules.uml.core.metamodel.core.foundation.UMLXMLManip.copyFile(UMLXMLManip.java:2708)
        at org.netbeans.modules.uml.core.metamodel.core.foundation.UMLXMLManip.verifyDTDExistence(UMLXMLManip.java:2681)
        at org.netbeans.modules.uml.core.metamodel.structure.Project.verifyDTDExistence(Project.java:644)
        at org.netbeans.modules.uml.core.metamodel.structure.Project.validateDTDSettings(Project.java:589)
        at org.netbeans.modules.uml.core.metamodel.structure.Project.internalSave(Project.java:1781)
        at org.netbeans.modules.uml.core.metamodel.structure.Project.internalPreCommit(Project.java:1699)
        at org.netbeans.modules.uml.core.metamodel.structure.Project.save(Project.java:269)
        at org.netbeans.modules.uml.core.Application.saveProject(Application.java:444)
        at org.netbeans.modules.uml.ui.products.ad.applicationcore.ADApplication.saveProject(ADApplication.java:402)
        at org.netbeans.modules.uml.project.UMLProjectHelper.saveProject(UMLProjectHelper.java:321)
        at org.netbeans.modules.uml.project.UMLProject.saveProject(UMLProject.java:432)
        at org.netbeans.modules.uml.project.UMLProjectGenerator.createEmptyProject(UMLProjectGenerator.java:275)
        at org.netbeans.modules.uml.project.UMLProjectGenerator.createRevEngProject(UMLProjectGenerator.java:200)
        at org.netbeans.modules.uml.integration.netbeans.actions.ReverseEngineerAction.createNewUMLProject(ReverseEngineerAction.java:511)
        at org.netbeans.modules.uml.integration.netbeans.actions.ReverseEngineerAction.access$300(ReverseEngineerAction.java:81)
        at org.netbeans.modules.uml.integration.netbeans.actions.ReverseEngineerAction$1.run(ReverseEngineerAction.java:478)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
WARNING [org.openide.loaders]: Should override getLookup() in class org.netbeans.modules.java.JavaDataObject, e.g.: 
[MultiDataObject.this.]getCookieSet().getLookup()
INFO [org.netbeans.modules.editor.settings.storage.SettingsProvider]: Won't provide any settings for text/base It's been deprecated, use MimePath.EMPTY 
instead.
INFO [org.netbeans.modules.java.source.usages.SymbolDumper]: Unhandled ElementKind: STATIC_INIT
WARNING [org.netbeans.modules.j2ee.metadata.model.api.support.annotation.AnnotationScanner]: findAnnotations: could not find type 
javax.persistence.Entity
WARNING [org.netbeans.modules.j2ee.metadata.model.api.support.annotation.AnnotationScanner]: findAnnotations: could not find type 
javax.persistence.Embeddable
WARNING [org.netbeans.modules.j2ee.metadata.model.api.support.annotation.AnnotationScanner]: findAnnotations: could not find type 
javax.persistence.MappedSuperclass