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"reading weka model (CannotResolveClassException: m_Objects)"

User: "meliniak"
meliniak
New Altair Community Member
Updated by Jocelyn
I trained a model (simple CART, it's the weka one), saved it in a file and created second process to apply the model. Pretty standard scenario.

Applying model works fine in RM GUI, but when I'm trying to use it in Java, I'm getting, during reading the model from file, such error: 
Feb 10, 2014 1:52:22 AM com.rapidminer.Process run
INFO: Process /home/maliniak/.RapidMiner5/repositories/nasa/nasa_apply_model_api.rmp starts
Feb 10, 2014 1:52:22 AM com.rapidminer.Process loadInitialData
INFO: Loading initial data (starting at port 2).
Exception in thread "main" java.lang.IllegalStateException: com.rapidminer.operator.UserError: Could not read file '/home/maliniak/misc/nasa/model/ticker_cart': java.io.IOException: Cannot read from XML stream, wrong format: m_Objects : m_Objects
---- Debugging information ----
message             : m_Objects
cause-exception     : com.thoughtworks.xstream.mapper.CannotResolveClassException
cause-message       : m_Objects
class               : java.util.ArrayList
required-type       : java.util.ArrayList
converter-type      : com.thoughtworks.xstream.converters.collections.CollectionConverter
line number         : 1915
class[1]            : weka.core.Instances
converter-type[1]   : com.thoughtworks.xstream.converters.reflection.ReflectionConverter
class[2]            : weka.classifiers.trees.SimpleCart
class[3]            : com.rapidminer.operator.learner.weka.WekaClassifier
converter-type[2]   : com.thoughtworks.xstream.converters.reflection.SerializableConverter
version             : null
-------------------------------.
	at net.maliniak.nasa.Engine.main(Engine.java:125)
Caused by: com.rapidminer.operator.UserError: Could not read file '/home/maliniak/misc/nasa/model/ticker_cart': java.io.IOException: Cannot read from XML stream, wrong format: m_Objects : m_Objects
---- Debugging information ----
message             : m_Objects
cause-exception     : com.thoughtworks.xstream.mapper.CannotResolveClassException
cause-message       : m_Objects
class               : java.util.ArrayList
required-type       : java.util.ArrayList
converter-type      : com.thoughtworks.xstream.converters.collections.CollectionConverter
line number         : 1915
class[1]            : weka.core.Instances
converter-type[1]   : com.thoughtworks.xstream.converters.reflection.ReflectionConverter
class[2]            : weka.classifiers.trees.SimpleCart
class[3]            : com.rapidminer.operator.learner.weka.WekaClassifier
converter-type[2]   : com.thoughtworks.xstream.converters.reflection.SerializableConverter
version             : null
-------------------------------.
	at com.rapidminer.operator.io.ModelLoader.read(ModelLoader.java:81)
	at com.rapidminer.operator.io.ModelLoader.read(ModelLoader.java:51)
	at com.rapidminer.operator.io.AbstractReader.doWork(AbstractReader.java:126)
	at com.rapidminer.operator.Operator.execute(Operator.java:866)
	at com.rapidminer.operator.execution.SimpleUnitExecutor.execute(SimpleUnitExecutor.java:51)
	at com.rapidminer.operator.ExecutionUnit.execute(ExecutionUnit.java:711)
	at com.rapidminer.operator.OperatorChain.doWork(OperatorChain.java:375)
	at com.rapidminer.operator.Operator.execute(Operator.java:866)
	at com.rapidminer.Process.run(Process.java:949)
	at com.rapidminer.Process.run(Process.java:873)
	at com.rapidminer.Process.run(Process.java:832)
	at com.rapidminer.Process.run(Process.java:827)
	at net.maliniak.nasa.ModelAdapter.getRecommendation(ModelAdapter.java:33)
	at net.maliniak.nasa.Engine.fire(Engine.java:70)
	at net.maliniak.nasa.Engine.main(Engine.java:123)
Caused by: java.io.IOException: Cannot read from XML stream, wrong format: m_Objects : m_Objects
---- Debugging information ----
message             : m_Objects
cause-exception     : com.thoughtworks.xstream.mapper.CannotResolveClassException
cause-message       : m_Objects
class               : java.util.ArrayList
required-type       : java.util.ArrayList
converter-type      : com.thoughtworks.xstream.converters.collections.CollectionConverter
line number         : 1915
class[1]            : weka.core.Instances
converter-type[1]   : com.thoughtworks.xstream.converters.reflection.ReflectionConverter
class[2]            : weka.classifiers.trees.SimpleCart
class[3]            : com.rapidminer.operator.learner.weka.WekaClassifier
converter-type[2]   : com.thoughtworks.xstream.converters.reflection.SerializableConverter
version             : null
-------------------------------
	at com.rapidminer.tools.XMLSerialization.fromXML(XMLSerialization.java:147)
	at com.rapidminer.operator.AbstractIOObject.read(AbstractIOObject.java:148)
	at com.rapidminer.operator.AbstractIOObject.read(AbstractIOObject.java:192)
	at com.rapidminer.operator.io.ModelLoader.read(ModelLoader.java:79)
	... 14 more
Caused by: com.thoughtworks.xstream.converters.ConversionException: m_Objects : m_Objects
---- Debugging information ----
message             : m_Objects
cause-exception     : com.thoughtworks.xstream.mapper.CannotResolveClassException
cause-message       : m_Objects
class               : java.util.ArrayList
required-type       : java.util.ArrayList
converter-type      : com.thoughtworks.xstream.converters.collections.CollectionConverter
line number         : 1915
class[1]            : weka.core.Instances
converter-type[1]   : com.thoughtworks.xstream.converters.reflection.ReflectionConverter
class[2]            : weka.classifiers.trees.SimpleCart
class[3]            : com.rapidminer.operator.learner.weka.WekaClassifier
converter-type[2]   : com.thoughtworks.xstream.converters.reflection.SerializableConverter
version             : null
-------------------------------
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:79)
	at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshallField(AbstractReflectionConverter.java:355)
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:306)
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:234)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
	at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshallField(AbstractReflectionConverter.java:355)
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:306)
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:234)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
	at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
	at com.thoughtworks.xstream.converters.reflection.SerializableConverter$2.defaultReadObject(SerializableConverter.java:370)
	at com.thoughtworks.xstream.converters.reflection.SerializableConverter.doUnmarshal(SerializableConverter.java:415)
	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:234)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
	at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134)
	at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32)
	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1052)
	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1024)
	at com.thoughtworks.xstream.XStream$2.readFromStream(XStream.java:1716)
	at com.thoughtworks.xstream.core.util.CustomObjectInputStream.readObjectOverride(CustomObjectInputStream.java:104)
	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:344)
	at com.rapidminer.tools.XMLSerialization.fromXML(XMLSerialization.java:141)
	... 17 more
Caused by: com.thoughtworks.xstream.mapper.CannotResolveClassException: m_Objects
	at com.thoughtworks.xstream.mapper.DefaultMapper.realClass(DefaultMapper.java:56)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
	at com.thoughtworks.xstream.mapper.DynamicProxyMapper.realClass(DynamicProxyMapper.java:55)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
	at com.thoughtworks.xstream.mapper.PackageAliasingMapper.realClass(PackageAliasingMapper.java:88)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
	at com.thoughtworks.xstream.mapper.ClassAliasingMapper.realClass(ClassAliasingMapper.java:79)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
	at com.thoughtworks.xstream.mapper.ArrayMapper.realClass(ArrayMapper.java:74)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
	at com.thoughtworks.xstream.mapper.CachingMapper.realClass(CachingMapper.java:45)
	at com.thoughtworks.xstream.core.util.HierarchicalStreams.readClassType(HierarchicalStreams.java:29)
	at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.readItem(AbstractCollectionConverter.java:70)
	at com.thoughtworks.xstream.converters.collections.CollectionConverter.addCurrentElementToCollection(CollectionConverter.java:79)
	at com.thoughtworks.xstream.converters.collections.CollectionConverter.populateCollection(CollectionConverter.java:72)
	at com.thoughtworks.xstream.converters.collections.CollectionConverter.populateCollection(CollectionConverter.java:66)
	at com.thoughtworks.xstream.converters.collections.CollectionConverter.unmarshal(CollectionConverter.java:61)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
	... 47 more
Any ideas anyone, please?

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