HibernateSystemException: could not deserialize

[Vyas Sanzgiri]

  
class ProcessParamValues implements Serializable{
ProcessParamNames id
String paramValue
//static searchable = true
    static constraints = {
        id(blank:false,nullable:false,maxlength:20)
        paramValue(blank:false,nullable:false,maxlength:200)
        paramValue(unique:'id')
    }
    static mapping = {
        table 'process_param_values'
        version false
        id column : 'PARAM_NAME', generator:'assigned'
        paramValue column : 'PARAM_VALUE'
    }
    static belongsTo = ProcessParamNames
}

  

I get the following error:-
Error 500: org.springframework.orm.hibernate3.HibernateSystemException: could not deserialize; nested exception is org.hibernate.type.SerializationException: could not deserialize
Servlet: grails
URI: /ProcessParameterEditor/grails/processParamValues/list.dispatch
Exception Message: invalid stream header
Caused by: org.springframework.orm.hibernate3.HibernateSystemException: could not deserialize; nested exception is org.hibernate.type.SerializationException: could not deserialize
Class: ProcessParamValuesController
At Line: [12]
Code Snippet:

11: params.max = Math.min( params.max ? params.max.toInteger() : 10, 100)
12: [ processParamValuesInstanceList: ProcessParamValues.list( params ), processParamValuesInstanceTotal: ProcessParamValues.count() ]
13: }


Any help would be appreciated