java.lang.IllegalArgumentException异常 返回值类型的问题

 1 java.lang.IllegalArgumentException: Cannot create TypedQuery for query with more than one return using requested result type [com.tao.pojo.Student]
 2     at org.hibernate.internal.AbstractSharedSessionContract.resultClassChecking(AbstractSharedSessionContract.java:740)
 3     at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:687)
 4     at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:103)
 5     at com.tao.test.StudentTest.test001(StudentTest.java:47)
 6     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 7     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
 8     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 9     at java.lang.reflect.Method.invoke(Method.java:498)
10     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
11     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
12     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
13     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
14     at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
15     at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
16     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
17     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
18     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
19     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
20     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
21     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
22     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
23     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
24     at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
25     at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
26     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
27     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
28     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
29     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
30     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
31 
32 org.hibernate.TransactionException: Transaction was marked for rollback only; cannot commit
33     at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:228)
34     at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:68)
35     at com.tao.test.StudentTest.testAfter(StudentTest.java:32)
36     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
37     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
38     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
39     at java.lang.reflect.Method.invoke(Method.java:498)
40     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
41     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
42     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
43     at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:33)
44     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
45     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
46     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
47     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
48     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
49     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
50     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
51     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
52     at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
53     at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
54     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
55     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
56     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
57     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
58     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
报这个错是时把 Student 类型换成 Object[]
错误的：
@Test
    public void test001() {
        Query<Student> query = session.createQuery("from Student s inner join s.clazz", Student.class);
        List<Student> list = query.list();
        for (Student stu : list) {
            System.out.println(stu+","+stu.getClass().getName());
        }
    }
正确写法：
    @Test
    public void test001() {
        Query<Object[]> query = session.createQuery("from Student s inner join s.clazz", Object[].class);
        List<Object[]> list = query.list();
        for (Object[] oo : list) {
            System.out.println(oo+","+oo.getClass().getName());
        }
    }
第一行末尾 result type 就说了是返回值类型的问题，这里换成Object[]就OK了。