Christopher,
the HTML page at http://www.castor.org/ unfortunately has not been
updated with the last release. We know about this deficiency already,
and we have provided fixes in SVN already (which will be made available
with Castor 1.2.1).
In addition (as far as I remember), there might be an issue with this
that has (again) already be fixed with SVN trunk.
The code to initialize an XMLClassDescriptorresolver should read:
Mapping mapping = new Mapping();
mapping.loadMapping(...);
ClassDescriptorResolver classDescriptorResolver =
ClassDescriptorResolverFactory
.createClassDescriptorResolver(BindingType.XML);
MappingUnmarshaller mappingUnmarshaller = new MappingUnmarshaller();
MappingLoader mappingLoader = mappingUnmarshaller.getMappingLoader(
mapping, BindingType.XML);
classDescriptorResolver.setMappingLoader(mappingLoader);
Once this has been done, you can start re-using the
ClassdescriptorResolver on any Un- and Marshaller instance you with to use.
Sorry for any inconvenience caused ...
Werner
Christopher Hunt wrote:
> Hi there,
>
> I really want to use Castor but I'm running into some performance
> issues. I previously attempted to mitigate this by keeping a marshaler
> instance around and invoking the marshal method many times. This does
> not appear to work as things end up hanging (I think on the second
> invocation). Consequently I searched and found the best practices advice...
>
> I've attempted to follow the best practices guide re. performance but
> then run into a null pointer exception. Here's the stack trace:
>
> java.lang.NullPointerException
> at
> org.exolab.castor.xml.util.XMLClassDescriptorResolverImpl.setMappingLoader(XMLClassDescriptorResolverImpl.java:143)
>
> at
> com.classactionpl.mule.transformer.GMLObjectToGML.<init>(GMLObjectToGML.java:44)
>
> at
> com.classactionpl.mule.transformer.GMLObjectToGMLTest.testTransformMuleMessageString(GMLObjectToGMLTest.java:17)
>
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>
> at java.lang.reflect.Method.invoke(Method.java:585)
> at junit.framework.TestCase.runTest(TestCase.java:154)
> at junit.framework.TestCase.runBare(TestCase.java:127)
> at junit.framework.TestResult$1.protect(TestResult.java:106)
> at junit.framework.TestResult.runProtected(TestResult.java:124)
> at junit.framework.TestResult.run(TestResult.java:109)
> at junit.framework.TestCase.run(TestCase.java:118)
> at junit.framework.TestSuite.runTest(TestSuite.java:208)
> at junit.framework.TestSuite.run(TestSuite.java:203)
> at
> org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
>
> at
> org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
>
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
>
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
>
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
>
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
>
>
> Here's my constructor code:
>
> Mapping mapping = new Mapping();
>
> try {
> URL url = this.getClass().getResource("/JourneyMappings.xml");
> mapping.loadMapping(url);
>
> classDescriptorResolver = ClassDescriptorResolverFactory
> .createClassDescriptorResolver(BindingType.XML);
> MappingUnmarshaller mappingUnmarshaller = new
> MappingUnmarshaller();
> MappingLoader mappingLoader =
> mappingUnmarshaller.getMappingLoader(
> mapping, BindingType.XML);
> classDescriptorResolver.setMappingLoader(mappingLoader);
>
> out = new StringWriter();
>
> } catch (IOException e) {
> logger.fatal(e);
> } catch (MappingException e) {
> logger.fatal(e);
> }
>
> ...and then subsequently, for each marshaling invocation:
>
> assert out != null;
>
> StringBuffer buffer = out.getBuffer();
> out.getBuffer().delete(0, buffer.length());
>
> Marshaller marshaller = new Marshaller();
> marshaller.setNamespaceMapping("",
> "http://www.opengis.net/gml/3.2";);
> marshaller.setNamespaceMapping("gml",
> "http://www.opengis.net/gml/3.2";);
> marshaller.setValidation(false);
>
> assert classDescriptorResolver != null;
>
> marshaller
> .setResolver((XMLClassDescriptorResolver)
> classDescriptorResolver);
>
> try {
> marshaller.setWriter(out);
> marshaller.marshal(src);
>
> } catch (MarshalException e) {
> throw new TransformerException(this, e);
> } catch (ValidationException e) {
> throw new TransformerException(this, e);
> } catch (IOException e) {
> throw new TransformerException(this, e);
> }
>
> return out.toString();
>
> Any indication on what is wrong with the approach?
>
> Cheers,
> -C
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