如何解决HQL - EntityManager.createQuery 在 CaseInsensitiveComparator.compare 上抛出 NPE
我正在尝试使用来自多个 SELECT 语句的列创建一个 SELECT 查询,但是它因 NPE 而失败。下面是查询,然后是堆栈跟踪。感谢您的帮助!
Query query = em.createquery("SELECT disTINCT " +
"(SELECT count(*) AS totalPlayers FROM TeamEntity t,AssignmentsEntity a,JerseyEntity p " +
"WHERE t.id = a.teamid AND p.jerseyId = a.jerseyid and t.id = :teamId)," +
"(SELECT count(*) AS activePlayers FROM TeamEntity t2,AssignmentsEntity a2,JerseyEntity " +
"WHERE t2.id = a2.teamid AND JerseyEntity.jerseyid = a2.jerseyid AND t2.id = :teamId " +
"AND starttime > 0) " +
"FROM TeamEntity");
query.setParameter("teamId",teamId);
java.lang.NullPointerException
at java.lang.String$CaseInsensitiveComparator.compare(String.java:1192)
at java.lang.String$CaseInsensitiveComparator.compare(String.java:1186)
at java.util.TreeMap.getEntryUsingComparator(TreeMap.java:376)
at java.util.TreeMap.getEntry(TreeMap.java:345)
at java.util.TreeMap.get(TreeMap.java:278)
at org.hibernate.dialect.function.sqlFunctionRegistry.findsqlFunction(sqlFunctionRegistry.java:45)
at org.hibernate.hql.internal.ast.util.SessionFactoryHelper.findsqlFunction(SessionFactoryHelper.java:385)
at org.hibernate.hql.internal.ast.tree.IdentNode.getDataType(IdentNode.java:374)
at org.hibernate.hql.internal.ast.HqlsqlWalker.lookupProperty(HqlsqlWalker.java:659)
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.addrExpr(HqlsqlbaseWalker.java:5002)
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.expr(HqlsqlbaseWalker.java:1286)
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.exprOrSubquery(HqlsqlbaseWalker.java:4706)
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.comparisonExpr(HqlsqlbaseWalker.java:4174)
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.logicalExpr(HqlsqlbaseWalker.java:2138)
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.logicalExpr(HqlsqlbaseWalker.java:2066)
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.logicalExpr(HqlsqlbaseWalker.java:2063)
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.logicalExpr(HqlsqlbaseWalker.java:2063)
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.whereClause(HqlsqlbaseWalker.java:815)
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.query(HqlsqlbaseWalker.java:609)
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.selectExpr(HqlsqlbaseWalker.java:2466)
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.selectExprList(HqlsqlbaseWalker.java:2232)
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.selectClause(HqlsqlbaseWalker.java:1503)
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.query(HqlsqlbaseWalker.java:585)
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.selectStatement(HqlsqlbaseWalker.java:313)
at org.hibernate.hql.internal.antlr.HqlsqlbaseWalker.statement(HqlsqlbaseWalker.java:261)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:271)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:191)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:143)
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:119)
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:80)
at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:153)
at org.hibernate.internal.AbstractSharedSessionContract.getQueryPlan(AbstractSharedSessionContract.java:597)
at org.hibernate.internal.AbstractSharedSessionContract.createquery(AbstractSharedSessionContract.java:706)
at org.hibernate.internal.AbstractSharedSessionContract.createquery(AbstractSharedSessionContract.java:731)
at org.hibernate.internal.AbstractSessionImpl.createquery(AbstractSessionImpl.java:23)
解决方法
不是我正在寻找的确切解决方案,但我只是使用了 em.createNativeQuery() 并且这对我有用。希望以后不会造成任何麻烦。
,你试过了吗?
Query query = em.createQuery("SELECT DISTINCT " +
"(SELECT count(*) AS totalPlayers FROM TeamEntity t,AssignmentsEntity a,JerseyEntity p " +
"WHERE t.id = a.teamid AND p.jerseyId = a.jerseyid and t.id = :teamId)," +
"(SELECT count(*) AS activePlayers FROM TeamEntity t2,AssignmentsEntity a2,JerseyEntity p " +
"WHERE t2.id = a2.teamid AND p.jerseyid = a2.jerseyid AND t2.id = :teamId " +
"AND starttime > 0) " +
"FROM TeamEntity");
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。