java - hibernate subquery throwing Null Pointer Exception -

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i trying fire subquery hibernate, showing npe:-(anyone know how resolve it? below code:

detachedcriteria criteria = detachedcriteria.forclass(my.class,"a");         criteria.createalias("a.a", "a");         criteria.createalias("a.b", "b");         if(cvalue !=null && cvalue.size()>0){             criteria.add(restrictions.in("b.c", cvalue));         }         if(stringutils.isnotempty(commoditylist)){             detachedcriteria commcriteria  = detachedcriteria.forclass(my.class,"a1");             commcriteria.createalias("a1.a", "a1");             commcriteria.add(restrictions.in("a1.name", commoditylist.split(",")));             criteria.add(subqueries.propertyin("b.c", commcriteria));         }         criteria.addorder(order.asc("b.c"));          return gethibernatetemplate().findbycriteria(criteria);

stack trace:

java.lang.nullpointerexception     @ org.hibernate.loader.criteria.criteriaquerytranslator.getprojectedtypes(criteriaquerytranslator.java:318)     @ org.hibernate.criterion.subqueryexpression.tosqlstring(subqueryexpression.java:56)     @ org.hibernate.loader.criteria.criteriaquerytranslator.getwherecondition(criteriaquerytranslator.java:334)     @ org.hibernate.loader.criteria.criteriajoinwalker.<init>(criteriajoinwalker.java:82)     @ org.hibernate.loader.criteria.criterialoader.<init>(criterialoader.java:67)     @ org.hibernate.impl.sessionimpl.list(sessionimpl.java:1550)     @ org.hibernate.impl.criteriaimpl.list(criteriaimpl.java:283)     @ org.springframework.orm.hibernate3.hibernatetemplate$36.doinhibernate(hibernatetemplate.java:1065)     @ org.springframework.orm.hibernate3.hibernatetemplate.doexecute(hibernatetemplate.java:419)     @ org.springframework.orm.hibernate3.hibernatetemplate.executewithnativesession(hibernatetemplate.java:374)     @ org.springframework.orm.hibernate3.hibernatetemplate.findbycriteria(hibernatetemplate.java:1055)     @ org.springframework.orm.hibernate3.hibernatetemplate.findbycriteria(hibernatetemplate.java:1048)     @ com.boeing.kmapi.base.skillset.dao.impl.essskillsetcommmapdaoimpl.getessskillsetcommmapforskillsetidlist(essskillsetcommmapdaoimpl.java:51)     @ com.boeing.kmapi.base.skillset.service.impl.essgenericreportserviceimpl.filtercommoditydetails(essgenericreportserviceimpl.java:87)     @ com.boeing.kmapi.base.skillset.service.impl.essgenericreportserviceimpl.getgenericreport(essgenericreportserviceimpl.java:79)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:39)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:25)     @ java.lang.reflect.method.invoke(method.java:597)

the issue resoled adding projection inner query.

commcriteria.createalias("a1.b", "b1"); commcriteria.setprojection(projections.projectionlist().add(projections.property("b1.c")));

the issue resoled adding projection inner query.

commcriteria.createalias("a1.b", "b1"); commcriteria.setprojection(projections.projectionlist().add(projections.property("b1.c")));

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