1 java.lang.IllegalArgumentException: org.hibernate.hql.ast.QuerySyntaxException: Person is not mapped [select person from Person person] 2 at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:601) 3 at org.hibernate.ejb.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:96) 4 at com.b2gonline.test.Jpatest.saveCascadeObject(Jpatest.java:89) 5 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 6 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 7 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 8 at java.lang.reflect.Method.invoke(Method.java:597) 9 at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) 10 at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) 11 at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) 12 at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) 13 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76) 14 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) 15 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) 16 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) 17 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) 18 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) 19 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) 20 at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28) 21 at org.junit.runners.ParentRunner.run(ParentRunner.java:236) 22 at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49) 23 at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) 24 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) 25 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) 26 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) 27 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) 28 Caused by: org.hibernate.hql.ast.QuerySyntaxException: Person is not mapped [select person from Person person] 29 at org.hibernate.hql.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:181) 30 at org.hibernate.hql.ast.tree.FromElementFactory.addFromElement(FromElementFactory.java:110) 31 at org.hibernate.hql.ast.tree.FromClause.addFromElement(FromClause.java:93) 32 at org.hibernate.hql.ast.HqlSqlWalker.createFromElement(HqlSqlWalker.java:277) 33 at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3056) 34 at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:2945) 35 at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:688) 36 at org.hibernate.hql.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:544) 37 at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:281) 38 at org.hibernate.hql.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:229) 39 at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:251) 40 at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:183) 41 at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:134) 42 at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:101) 43 at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:80) 44 at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:94) 45 at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:156) 46 at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:135) 47 at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1650) 48 at org.hibernate.ejb.AbstractEntityManagerImpl.createQuery(AbstractEntityManagerImpl.java:93) 49 ... 24 more
這個原因是 實體與表映射不上。
List<Person> persons = em.createQuery("select person from Person person").getResultList();
System.out.println("persons.size():" + persons.size());
在使用實體名稱進行查詢時 請確定表名是否和實體名稱相同，如果不相同的話，請在實體類前加上 @Table (name="表名") 注釋