java - HQL NullPointerException -


i have query writen in hql throwing nullpointerexception , can't see why. thrown more specific exception, related sql grammar.

select sum(coalesce(opt.qtvagasedital, 1)) - sum(     (select count(b.id)      bolsa b      b.cotabolsaatual.id = cb.id      , ( now() between b.datainicio , b.datafim )      , (b.idedital = opt.idedital ))  )  oportunidadeestagio opt  opt.cotabolsa.id = cb.id  , (opt.registroinativacao.id null)

idedital can null in both bolsa , oportunidadeestagio, when convert query sql using postgres works fine.

the nullpointer thrown in 

query query = getsession().createquery(queryhql);

stacktrace: 

caused by: java.lang.nullpointerexception  @ org.hibernate.dialect.dialect$3.getreturntype(dialect.java:102)  @ org.hibernate.hql.ast.util.sessionfactoryhelper.findfunctionreturntype(sessionfactoryhelper.java:382)  @ org.hibernate.hql.ast.tree.aggregatenode.getdatatype(aggregatenode.java:21)  @ org.hibernate.hql.ast.tree.binaryarithmeticoperatornode.initialize(binaryarithmeticoperatornode.java:29)  @ org.hibernate.hql.ast.hqlsqlwalker.preparearithmeticoperator(hqlsqlwalker.java:1011)  @ org.hibernate.hql.antlr.hqlsqlbasewalker.arithmeticexpr(hqlsqlbasewalker.java:2756)  @ org.hibernate.hql.antlr.hqlsqlbasewalker.selectexpr(hqlsqlbasewalker.java:2006)  @ org.hibernate.hql.antlr.hqlsqlbasewalker.selectexprlist(hqlsqlbasewalker.java:1825)  @ org.hibernate.hql.antlr.hqlsqlbasewalker.selectclause(hqlsqlbasewalker.java:1394)  @ org.hibernate.hql.antlr.hqlsqlbasewalker.query(hqlsqlbasewalker.java:553)  @ org.hibernate.hql.antlr.hqlsqlbasewalker.selectexpr(hqlsqlbasewalker.java:2014)  @ org.hibernate.hql.antlr.hqlsqlbasewalker.aliasedselectexpr(hqlsqlbasewalker.java:2057)  @ org.hibernate.hql.antlr.hqlsqlbasewalker.selectexprlist(hqlsqlbasewalker.java:1832)  @ org.hibernate.hql.antlr.hqlsqlbasewalker.selectclause(hqlsqlbasewalker.java:1394)  @ org.hibernate.hql.antlr.hqlsqlbasewalker.query(hqlsqlbasewalker.java:553)  @ org.hibernate.hql.antlr.hqlsqlbasewalker.selectstatement(hqlsqlbasewalker.java:281)  @ org.hibernate.hql.antlr.hqlsqlbasewalker.statement(hqlsqlbasewalker.java:229)  @ org.hibernate.hql.ast.querytranslatorimpl.analyze(querytranslatorimpl.java:228)  @ org.hibernate.hql.ast.querytranslatorimpl.docompile(querytranslatorimpl.java:160)  @ org.hibernate.hql.ast.querytranslatorimpl.compile(querytranslatorimpl.java:111)  @ org.hibernate.engine.query.hqlqueryplan.<init>(hqlqueryplan.java:77)  @ org.hibernate.engine.query.hqlqueryplan.<init>(hqlqueryplan.java:56)  @ org.hibernate.engine.query.queryplancache.gethqlqueryplan(queryplancache.java:72)  @ org.hibernate.impl.abstractsessionimpl.gethqlqueryplan(abstractsessionimpl.java:133)  @ org.hibernate.impl.abstractsessionimpl.createquery(abstractsessionimpl.java:112)  @ org.hibernate.impl.sessionimpl.createquery(sessionimpl.java:1623)


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