Retrieve content type hierarchy using Java API

webroro — Mon, 13 Oct 2008 07:52:04 GMT

Hi Alfresco’s gurus,Using the Java API, I’m trying to retrieve a tree of subtypes inherited from the cm:content type. I’d like to display a tree of document type hierarchy. I used the dictionaryService bean and tried to use the following code but getting an error (see below):TypeDefinition rootConte

Re: Retrieve content type hierarchy using Java API

brian_robinson — Tue, 14 Oct 2008 04:23:11 GMT

Hi there,

I tried out your code, and it worked for me. I did change one thing though - your for loop had an extra ')' in there after rootContentType.getName() . I'm sure that wasn't your problem though, since you were able to run and generate that exception which would only be possible if you were able to compile.


        DictionaryService dictionaryService = _serviceRegistry.getDictionaryService();
        TypeDefinition rootContentType = dictionaryService.getType(QName.createQName("{" + NamespaceService.CONTENT_MODEL_1_0_URI + "}content"));
        for (QName name : dictionaryService.getSubTypes(rootContentType.getName(), false)) {
            System.out.println(" +– QName : " + name.toString());
        }
‍‍‍‍‍‍‍

Anyway, in looking closer at the exception, you have a NullPointerException in there. In looking at the source code, it appears that the only way you could get a NullPointer there is if something was wrong with the content model. Therefore, I suggest checking your log file upon server startup (at $TOMCAT_HOME/logs/catalina.out). If there are any exceptions output there as a result of a content model not being parsed, I would think that would cause a the NullPointer you're seeing. If that is the case, be sure to fix your content model problem before trying again. If that is not the case, then all I can suggest is that you download the Alfresco source code, connect a remote debugger, and step through the code until you can see exactly what is going on.

Thanks,
-Brian

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Retrieve content type hierarchy using Java API

Re: Retrieve content type hierarchy using Java API