IllegalAccessError while parsing PMML File

Hello,

I’m trying to build a RapidMiner extension to read PMML models. However I’m getting the following exception when unmarshaling a pmml file:

java.lang.IllegalAccessError: Class com.sun.xml.internal.bind.v2.runtime.reflect.Accessor$FieldReflection can not access a member of class org.dmg.pmml.PMML with modifiers "private"
	at com.sun.xml.internal.bind.v2.runtime.reflect.Accessor$FieldReflection.set(Accessor.java:262)
	at com.sun.xml.internal.bind.v2.runtime.reflect.TransducedAccessor$CompositeTransducedAccessorImpl.parse(TransducedAccessor.java:230)
	at com.sun.xml.internal.bind.v2.runtime.unmarshaller.StructureLoader.startElement(StructureLoader.java:195)
	at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext._startElement(UnmarshallingContext.java:559)
	at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.startElement(UnmarshallingContext.java:538)
	at com.sun.xml.internal.bind.v2.runtime.unmarshaller.SAXConnector.startElement(SAXConnector.java:153)
	at org.xml.sax.helpers.XMLFilterImpl.startElement(XMLFilterImpl.java:551)
	at org.jpmml.model.PMMLFilter.startElement(PMMLFilter.java:69)
	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:509)
	at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:374)
	at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl$NSContentDriver.scanRootElementHook(XMLNSDocumentScannerImpl.java:613)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3132)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:852)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:602)
	at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:112)
	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:505)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:841)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:770)
	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
	at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:357)
	at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:243)
	at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:214)
	at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:140)
	at javax.xml.bind.helpers.AbstractUnmarshallerImpl.unmarshal(AbstractUnmarshallerImpl.java:123)
	at org.jpmml.model.JAXBUtil.unmarshal(JAXBUtil.java:78)
	at org.jpmml.model.JAXBUtil.unmarshalPMML(JAXBUtil.java:64)
	at org.jpmml.model.PMMLUtil.unmarshal(PMMLUtil.java:34)
	at de.woistbier.rapidminer.pmml.operator.PMMLEvaluator.read(PMMLEvaluator.java:118)
	at de.woistbier.rapidminer.pmml.operator.PMMLEvaluator.read(PMMLEvaluator.java:34)
	at com.rapidminer.operator.io.AbstractReader.doWork(AbstractReader.java:126)
	at com.rapidminer.operator.Operator.execute(Operator.java:1005)
	at com.rapidminer.operator.execution.SimpleUnitExecutor.execute(SimpleUnitExecutor.java:77)
	at com.rapidminer.operator.ExecutionUnit$3.run(ExecutionUnit.java:812)
	at com.rapidminer.operator.ExecutionUnit$3.run(ExecutionUnit.java:807)
	at java.security.AccessController.doPrivileged(Native Method)
	at com.rapidminer.operator.ExecutionUnit.execute(ExecutionUnit.java:807)
	at com.rapidminer.operator.OperatorChain.doWork(OperatorChain.java:428)
	at com.rapidminer.operator.Operator.execute(Operator.java:1005)
	at com.rapidminer.Process.run(Process.java:1205)
	at com.rapidminer.Process.run(Process.java:1101)
	at com.rapidminer.Process.run(Process.java:1054)
	at com.rapidminer.Process.run(Process.java:1049)
	at com.rapidminer.Process.run(Process.java:1039)
	at com.rapidminer.gui.ProcessThread.run(ProcessThread.java:65)

This might be general problem when having restrictive security managers. So maybe making some fields in class org.dmg.pmml.PMML public could help. Any other ideas?

[vruusmann]

One final hurdle was to permit Maven to find MyClassTransformer on the classpath when executing the plugin.

@0xcfe4f1 Apache Maven plugins can declare their own “locally scoped” dependencies. For example, see https://github.com/jpmml/jpmml-model/blob/master/pmml-model/pom.xml#L195-L201

[vruusmann]

Another idea - maybe there is some Apache Maven plugin that can rewrite JPMML-Model classes (during the packaging phase of the build) by changing all field access modifiers from private to public.

This way the JPMML-Model library could stay as it is, and you could still have your “tweaked” variant of it.