hibernate的formula问题，急

[keemchina]

<property name="belongname" type="java.lang.String">
<formula>(SELECT r.name FROM Road r WHERE r.state=1 AND r.reason!=-7 AND r.rid=belongrid)</formula>
</property>
加了以上这个虚拟字段
加了后，只要是HQL都能正常，但
Query query1 = session.createSQLQuery(sqlForQuery).addEntity(Section.class);这一类用createSQLQuery再addEntity的，就会报错
Exception in thread "main" java.lang.NullPointerException
at org.hibernate.loader.DefaultEntityAliases.intern(DefaultEntityAliases.java:133)
at org.hibernate.loader.DefaultEntityAliases.getSuffixedPropertyAliases(DefaultEntityAliases.java:106)
at org.hibernate.loader.DefaultEntityAliases.<init>(DefaultEntityAliases.java:52)
at org.hibernate.loader.ColumnEntityAliases.<init>(ColumnEntityAliases.java:16)
at org.hibernate.loader.custom.sql.SQLQueryReturnProcessor.generateCustomReturns(SQLQueryReturnProcessor.java:174)
at org.hibernate.loader.custom.sql.SQLCustomQuery.<init>(SQLCustomQuery.java:129)
at org.hibernate.engine.query.NativeSQLQueryPlan.<init>(NativeSQLQueryPlan.java:43)
at org.hibernate.engine.query.QueryPlanCache.getNativeSQLQueryPlan(QueryPlanCache.java:114)
at org.hibernate.impl.AbstractSessionImpl.getNativeSQLQueryPlan(AbstractSessionImpl.java:137)
at org.hibernate.impl.AbstractSessionImpl.list(AbstractSessionImpl.java:142)
at org.hibernate.impl.SQLQueryImpl.list(SQLQueryImpl.java:152)
at com.totapps.shcims.server.datacz.DataTools.临时测试(DataTools.java:131)
at com.totapps.shcims.server.datacz.DataTools.main(DataTools.java:72)
只要去掉formula就正常了
怎么解决？