[castor-dev] Hashmap problem

[Poolakal, Noufal]

I have a class with an instance variable of type Hashmap. My mapping for this field is <field name="options" collection="map">           <bind-xml name="options"/> </field> When I try to set mapping for the marshaller Intrestingly when I debug the application, I get the following error, java.lang.NullPointerException       at org.exolab.castor.mapping.Mapping.getResolver(Mapping.java:291)       at org.exolab.castor.mapping.Mapping.getResolver(Mapping.java:246)       at org.exolab.castor.xml.Marshaller.setMapping(Marshaller.java:512)       at HashMapTest.main(HashMapTest.java:71)       at HashMapTest.main(HashMapTest.java:71) and when I run the application, I am getting the exception java.lang.NullPointerException       at java.lang.Class.isAssignableFrom(Native Method)       at org.exolab.castor.xml.util.XMLFieldDescriptorImpl.<init>(XMLFieldDescriptorImpl.java:320)       at org.exolab.castor.xml.XMLMappingLoader.createFieldDesc(XMLMappingLoader.java:379)       at org.exolab.castor.mapping.loader.MappingLoader.createFieldDescs(MappingLoader.java:618)       at org.exolab.castor.mapping.loader.MappingLoader.createDescriptor(MappingLoader.java:441)       at org.exolab.castor.xml.XMLMappingLoader.createDescriptor(XMLMappingLoader.java:192)       at org.exolab.castor.mapping.loader.MappingLoader.loadMapping(MappingLoader.java:258)       at org.exolab.castor.mapping.Mapping.getResolver(Mapping.java:291)       at org.exolab.castor.mapping.Mapping.getResolver(Mapping.java:246)       at org.exolab.castor.xml.Marshaller.setMapping(Marshaller.java:512)       at HashMapTest.main(HashMapTest.java:71)   Somebody pls give me some idea on why I am getting this strange errors. I am using version 0.9.5.2