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

环境

MyEclipse 8.6+Hibernate3.2

 

问题

 

使用Hibernate出现如下错误:

 

org.hibernate.hql.ast.QuerySyntaxException: Unable to locate appropriate constructor on class [com.lo.entities.User] [select new User(u.userName,u.userAge) from com.lo.entities.User 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 com.ol.entities.LoTest.testListByHQL(LoTest.java:133)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)at java.lang.reflect.Method.invoke(Method.java:597)at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)at org.junit.runners.ParentRunner.run(ParentRunner.java:236)at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

 

解决

 

这是出现错误的地方使用的HQL：

String hql="select new User(u.userName,u.userAge) from User u";

 

当查询某个实体类的部分属性然后封装成List时，需要该属性构成的构造器。