Re: nodeFactory.getNoNamespace() returns null

Hi Evert,

The DOM4J implementation is in a state of flux. I'm struggling between trying 
to be a s close to the DOM4J API as possible and changing things to better 
fit Ozone (Namespace and QName for example). I've also on a contract 
assignment that takes up most of my time so I will not get back to look at 
this until later in the spring. The error you are seeing is because I have 
not made up my mind on whether Namespace should be a serializable object or a 
full OzoneObject. If you have ideas about this (which way to go) please let 
me know. If you are just looking for a persistant XMl implementation use the 
DOM implementation instead for now - it is more stable and feature complete.

Regards,
Per

tisdagen den 9 mars 2004 12.07 skrev Evert Hoff:
> Hi,
>
> I am trying to run the DocumentHelperTest example, but am getting a
> NullPointerException. It has to do with creating attributes. I have
> tried to track down the problem, but don't know what can be done to fix
> it...
>
> Here is the client output:
> ========================================
> D:\Eclipse\eclipse\workspace\ozone\modules\xml\dom4j\build\classes>java
> -classpa
> th
> .;..\..\..\..\..\server\build\lib\junit.jar;..\..\..\..\..\server\build\lib
>\o zoneServer-1.2-post_alpha.jar;..\dist\jaxen-core.jar
> test.ozoneDB.xml.dom4j.Docu
> mentHelperTest
> looking for OzoneDocumentFactory instance (DocumentFactory) for database
> RemoteD
> atabase: localhost, 3333
> returning factory class
> org.ozoneDB.xml.dom4j.o3impl.OzoneDocumentFactoryImpl_Pr
> oxy remoteID:104
> [DocumentHelperTest] - Refetching
> [DocumentHelperTest] - doc is class
> org.ozoneDB.xml.dom4j.o3impl.OzoneDocumentIm
> pl_Proxy remoteID:108
> [DocumentHelperTest] - Here's the content:
> <?xml version="1.0" encoding="UTF-8"?>
>
> [DocumentHelperTest] - Created test element class
> org.ozoneDB.xml.dom4j.o3impl.O
> zoneElementImpl_Proxy remoteID:30114
> [DocumentHelperTest] - adding content to element
> [DocumentHelperTest] - testElem.getName() test
> [DocumentHelperTest] - testElem test associated with document!
> [DocumentHelperTest] - getNamespace =
> org.dom4j.tree.AbstractNamespace@babe [Abs
> tractNamespace: prefix  mapped to URI ""]
> [DocumentHelperTest] - Here's the content:
> <?xml version="1.0" encoding="UTF-8"?>
> <test>some text</test>
> Comment added to testElem
> [DocumentHelperTest] - Here's the content:
> <?xml version="1.0" encoding="UTF-8"?>
> <test>some text<!--Comment text...--></test>
> Comment added to Document
> ========================================
>
> It hangs after "Comment added to Document", so the problem occurs during
> this line in DocumentHelperTest:
>             QName name = O3DocumentHelper.createQName("name");
>             System.out.println("Created qname");
>
> Here is the server output:
> ========================================
> (Ctrl-C or 'q' to shutdown without admin tool)
> class org.ozoneDB.xml.dom4j.o3impl.O3QNameCache O3QNameCache constructor
> invoked
>
> class org.ozoneDB.xml.dom4j.o3impl.O3QNameCache O3QNameCache constructor
> invoked
>
> [OzoneElementImpl] Creating new object
> class org.ozoneDB.xml.dom4j.o3impl.O3QNameCache O3QNameCache constructor
> invoked
>
> class org.ozoneDB.xml.dom4j.o3impl.O3QNameCache O3QNameCache constructor
> invoked
>
> createQName(name)
> looking for OzoneDocumentFactory instance (DocumentFactory) for database
> org.ozo
> neDB.Database@170888e
> returning factory class
> org.ozoneDB.xml.dom4j.o3impl.OzoneDocumentFactoryImpl_Pr
> oxy remoteID:104
> In cache: org.ozoneDB.xml.dom4j.o3impl.O3QName@337a8b [name: name
> namespace: "nu
> ll"]
> WARN   [Thread-4] InvokeServer - handleClientEvent():
> java.lang.NullPointerExcep
> tion
> java.lang.NullPointerException
>         at
> org.ozoneDB.xml.dom4j.o3impl.DefaultQName.writeObject(DefaultQName.ja
> va:198)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
>         at java.lang.reflect.Method.invoke(Unknown Source)
>         at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
>         at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
>         at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
>         at java.io.ObjectOutputStream.writeObject0(Unknown Source)
>         at java.io.ObjectOutputStream.writeObject(Unknown Source)
>         at org.ozoneDB.DxLib.net.DxClient.send(Unknown Source)
>         at org.ozoneDB.core.InvokeServer.handleClientEvent(Unknown Source)
>         at org.ozoneDB.DxLib.net.DxMultiServerClient.run(Unknown Source)
>         at java.lang.Thread.run(Unknown Source)
> ========================================
>
> The reason is the namespace is null in
> DefaultQName.writeObject(ObjectOutputStream out).
>
> That is null because nodeFactory.getNoNamespace() returns null.
>
> That is null because NamespaceCacheImpl.createNamespace(String prefix,
> String uri) has not yet been implemented:
>
>     /** A factory method to create {@link AbstractNamespace} instance
>      * @return a newly created {@link Namespace} instance.
>      */
>     protected Namespace createNamespace(String prefix, String uri) {
>         throw new RuntimeException("FIXME - should NamespaceCacheImpl
> become a real OzoneObject or whould db be passed?");
>         //return O3Namespace.create(db, prefix, uri);
>     }
>
> What can I do to fix this?
>
> Thanks in advance,
> Evert
>
>
>
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