org.hibernate.hql.ast.QuerySyntaxException: Unable to locate appropriate constructor on class xxx

最新推荐文章于 2020-08-14 10:20:45 发布

rjkkaikai

最新推荐文章于 2020-08-14 10:20:45 发布

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本文链接：https://blog.youkuaiyun.com/rjkkaikai/article/details/75122008

本文探讨了在使用Hibernate进行投影查询时出现的QuerySyntaxException异常，详细分析了错误产生的原因在于实体类中缺少相应的构造方法，并提供了排查及解决此类问题的方法。

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Exception in thread "main" org.hibernate.hql.ast.QuerySyntaxException: Unable to locate appropriate constructor on class [org.hibDemo.pojo.SysRole] [select new SysRole(u.rid,u.name) from org.hibDemo.pojo.SysRole u]
	at org.hibernate.hql.ast.QuerySyntaxException.convert(QuerySyntaxException.java:54)
	at org.hibernate.hql.ast.QuerySyntaxException.convert(QuerySyntaxException.java:47)
	at org.hibernate.hql.ast.ErrorCounter.throwQueryException(ErrorCounter.java:82)
	at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:261)
	at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:185)
	at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:136)
	at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:101)
	at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:80)
	at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:94)
	at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:156)
	at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:135)
	at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1651)
	at org.hibDemo.test.test.main(test.java:32)

原因是在做投影查询时实体类中没有提供对应的构造方法