Re: [mdr-users] NullPointerException

Please look at my earlier reply. Remove the mdr module jar from your 
classpath...
Martin

Cheng yong wrote:

> Hello, Leo,
>  
> thank you for your suggestion. Sorry that I must bother you again with 
> simple questions.
>  
> The code that you gave as an example doesn't solve the problem. I 
> still got the error. The eroor pointed to the line :
>  
> MDRepository repository =  MDRManager.getDefault().getDefaultRepository();
>  
> I suppose the programm looking for the MDRepository folder. So I 
> copied the MDRepository folder from .netbeans to my source folder in 
> eclipse. But I got the same error.
>  
> Is there any settings I should do at first, if I use eclipse IDE?
>  
> regards
>  
> lucia
>  
> P.S: I did not find the package named Model, but a package with the 
> name "Model_Management". Is that what you mean? In Addition, I got 10 
> Packages after I import UML XMI file. Can I just instantiate the 
> Package "Activity_Graphs", if I just want to create activity diagramm? 
> Or is it required to instantiate all.
>
>
> */Leonardo Gresta Paulino Murta <[email protected]>/* wrote:
>
>     Hello,
>
>     You need to load your metamodel first... Take a look on the following
>     code (it uses SPEM metamodel, but the idea is almost the same for
>     UML -
>     In the case of UML you will need to search for a package named
>     Model and
>     instantiate it...):
>
>     // Init Repository with SPEM metamodel (M2)
>     ModelPackage modelPackage =
>     (ModelPackage)repository.createExtent(METAMODEL_EXTENT);
>     URL xmiSpemMetamodel = this.getClass().getResource(SPEM_METAMODEL);
>     xmiReader.read(xmiSpemMetamodel.toString(), modelPackage);
>
>     // Init the SPEM model extent (M1)
>     Iterator iterator =
>     modelPackage.getMofPackage().refAllOfClass().iterator();
>     while (iterator.hasNext()) {
>     MofPackage mofPackage = (MofPackage)iterator.next();
>     if ("SPEM".equals(mofPackage.getName())) {
>     spemPackage = (SpemPackage)repository.createExtent(MODEL_EXTENT,
>     mofPackage);
>     URL xmiSpemModel = this.getClass().getResource(SPEM_MODEL);
>     xmiReader.read(xmiSpemModel.toString(), spemPackage);
>     break;
>     }
>     }
>
>     Leo
>
>     Cheng yong wrote:
>     > Hello, everyone,
>     >
>     > I'm now making my own example according to the online document
>     and try
>     > to figure out how the MDR works. Now I have got an
>     NullPointerException
>     > Error. Can anyone help me?
>     >
>     > What I did is as following:
>     > 1. NetBeans IDE 3.5.1: imported Metadata UML 1.4
>     (01-02-15_Diff.xml) and
>     > generated the JMI Interfaces.
>     > 2. Eclipse 3.1: created a new project, added all .jar files
>     which I can
>     > find in the installation folder, imported all generated files.
>     > 3. Eclipse 3.1: created a new demo class,
>     >
>     > package demo;
>     > import java.io.OutputStream;
>     > import java.util.Iterator;
>     > import org.netbeans.api.mdr.MDRManager;
>     > import org.netbeans.api.mdr.MDRepository;
>     > import org.netbeans.api.xmi.XMIWriterFactory;
>     > import org.omg.uml.*;
>     > import org.omg.uml.behavioralelements.activitygraphs.*;
>     > public class Demo {
>     >
>     > public static void main(String[] args) {
>     >
>     > OutputStream out = null;
>     >
>     > MDRepository repository =
>     > MDRManager.getDefault().getDefaultRepository();
>     >
>     > UmlPackage extent = (UmlPackage) repository.getExtent("Projects
>     > metadata");
>     > try{
>     >
>     >
>     XMIWriterFactory.getDefault().createXMIWriter().write(out,extent,"1.2");
>     > System.out.println(out.toString());
>     > } catch(Exception e){
>     > System.out.println("ERROR!");
>     > }
>     > }
>     > }
>     > 4. Eclipse 3.1: runed the demo, got the error:
>     >
>     > java.lang.NullPointerException
>     > at
>     >
>     org.netbeans.modules.mdr.MDRManagerImpl.refreshChildren(MDRManagerImpl.java:61)
>     > at
>     org.netbeans.modules.mdr.MDRManagerImpl.init(MDRManagerImpl.java:84)
>     > at
>     >
>     org.netbeans.modules.mdr.MDRManagerImpl.getRepository(MDRManagerImpl.java:94)
>     > at
>     >
>     org.netbeans.modules.mdr.MDRManagerImpl.getDefaultRepository(MDRManagerImpl.java:105)
>     > at demo.Demo.main(Demo.java:18)
>     > Exception in thread "main"
>     >
>     > thanks
>     >
>     > Lucia
>     >
>     >
>     ------------------------------------------------------------------------
>     > Start your day with Yahoo! - make it your home page
>     >
>
> ------------------------------------------------------------------------
> Start your day with Yahoo! - make it your home page 
> <http://us.rd.yahoo.com/evt=34442/*http://www.yahoo.com/r/hs>