jpa - Null Pointer Exception in executeObjectLevelReadQuery of EclipseLink -


i'm using eclipselink 2.5.2 in project , following exception: 

java.lang.nullpointerexception     @ org.eclipse.persistence.queries.readallquery.executeobjectlevelreadquery(readallquery.java:431)     @ org.eclipse.persistence.queries.objectlevelreadquery.executedatabasequery(objectlevelreadquery.java:1168)     @ org.eclipse.persistence.queries.databasequery.execute(databasequery.java:899)     @ org.eclipse.persistence.queries.objectlevelreadquery.execute(objectlevelreadquery.java:1127)     @ org.eclipse.persistence.queries.readallquery.execute(readallquery.java:403)     @ org.eclipse.persistence.internal.sessions.abstractsession.internalexecutequery(abstractsession.java:3214)     @ org.eclipse.persistence.internal.sessions.abstractsession.executequery(abstractsession.java:1804)     @ org.eclipse.persistence.internal.sessions.abstractsession.executequery(abstractsession.java:1786)     @ org.eclipse.persistence.mappings.collectionmapping.executebatchquery(collectionmapping.java:974)     @ org.eclipse.persistence.mappings.foreignreferencemapping.extractresultfrombatchquery(foreignreferencemapping.java:643)     @ org.eclipse.persistence.mappings.collectionmapping.extractresultfrombatchquery(collectionmapping.java:955)     @ org.eclipse.persistence.internal.indirection.batchvalueholder.instantiate(batchvalueholder.java:58)     @ org.eclipse.persistence.internal.indirection.querybasedvalueholder.instantiate(querybasedvalueholder.java:116)     @ org.eclipse.persistence.internal.indirection.databasevalueholder.getvalue(databasevalueholder.java:89)     @ org.eclipse.persistence.internal.indirection.unitofworkvalueholder.instantiateimpl(unitofworkvalueholder.java:173)     @ org.eclipse.persistence.internal.indirection.unitofworkvalueholder.instantiate(unitofworkvalueholder.java:234)     @ org.eclipse.persistence.internal.indirection.databasevalueholder.getvalue(databasevalueholder.java:89)     @ org.eclipse.persistence.indirection.indirectset.builddelegate(indirectset.java:211)     @ org.eclipse.persistence.indirection.indirectset.getdelegate(indirectset.java:375)     @ org.eclipse.persistence.indirection.indirectset.contains(indirectset.java:349)     @ com.services.categoryserviceimpl.categorycontainscaretype(categoryserviceimpl.java:305)     @

this section relationship between caretype , category defined , exception happens category.getcaretypes() invoked:

@manytomany(targetentity=caretypejpaimpl.class) @jointable(         name="j_care_type_category",         joincolumns={@joincolumn(name="category_id", referencedcolumnname="id")},         inversejoincolumns={@joincolumn(name="care_type_id", referencedcolumnname="id")}) @org.eclipse.persistence.annotations.batchfetch(value=org.eclipse.persistence.annotations.batchfetchtype.join,size=990) private set<caretype> caretypes = new hashset<caretype>();

i looked @ source code don't understand much


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