java.lang.OutOfMemoryError: Java heap space >

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java.lang.OutOfMemoryError: Java heap space >
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Class.java:2291)
at com.thoughtworks.xstream.mapper.AttributeMapper.getField(AttributeMapper.java:120)
at com.thoughtworks.xstream.mapper.AttributeMapper.getConverterFromAttribute(AttributeMapper.java:101)
at com.thoughtworks.xstream.mapper.MapperWrapper.getConverterFromAttribute(MapperWrapper.java:114)
at com.thoughtworks.xstream.mapper.MapperWrapper.getConverterFromAttribute(MapperWrapper.java:114)
at com.thoughtworks.xstream.mapper.MapperWrapper.getConverterFromAttribute(MapperWrapper.java:114)
at com.thoughtworks.xstream.mapper.MapperWrapper.getConverterFromAttribute(MapperWrapper.java:114)
at com.thoughtworks.xstream.mapper.MapperWrapper.getConverterFromAttribute(MapperWrapper.java:114)
at com.thoughtworks.xstream.mapper.MapperWrapper.getConverterFromAttribute(MapperWrapper.java:114)
at com.thoughtworks.xstream.mapper.MapperWrapper.getConverterFromAttribute(MapperWrapper.java:114)
at com.thoughtworks.xstream.mapper.MapperWrapper.getConverterFromAttribute(MapperWrapper.java:114)
at com.thoughtworks.xstream.mapper.MapperWrapper.getConverterFromAttribute(MapperWrapper.java:114)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:145)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:125)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:56)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:45)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:46)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:195)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:125)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:56)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:45)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:46)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:195)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:125)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:56)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:45)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:46)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:195)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:125)

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