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。