求救！空指针异常java.lang.NullPointerException
来源：1-11 通过Hibernate API编写访问数据库的代码
机智的意竹竹
2017-11-26 21:27
ps：43行对应24行 错误： java.lang.NullPointerException at StudentsTest.testSaveStudents(StudentsTest.java:43) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at junit.framework.TestCase.runTest(TestCase.java:168) at junit.framework.TestCase.runBare(TestCase.java:134) at junit.framework.TestResult$1.protect(TestResult.java:110) at junit.framework.TestResult.runProtected(TestResult.java:128) at junit.framework.TestResult.run(TestResult.java:113) at junit.framework.TestCase.run(TestCase.java:124) at junit.framework.TestSuite.runTest(TestSuite.java:243) at junit.framework.TestSuite.run(TestSuite.java:238) at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
@Before
public void init(){
Configuration config=new Configuration().configure();
ServiceRegistry serviceRegisty=new StandardServiceRegistryBuilder()
.applySettings(config.getProperties()).build();
sessionFactory=new MetadataSources(serviceRegisty).buildMetadata().buildSessionFactory();
session=sessionFactory.openSession();
transaction=session.beginTransaction();
}
@After
public void destory(){
transaction.commit();
session.close();
sessionFactory.close();
}
@Test
public void testSaveStudents(){
Students s=new Students(1,"男","张师傅",new Date(),"武当山");
session.save(s);
}
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- 慕田峪3481485
- 2017-11-27 18:51:52
用下面的方法创建 sessionFactory 对象吧；好像是版本有更新，空指针异常可能是其他方面导致的
Configuration cfg = new Configuration().configure();
ServiceRegistry builder= (ServiceRegistry) new StandardServiceRegistryBuilde(). applySettings(cfg.getProperties()).build();
sessionFactory = cfg.buildSessionFactory(builder);
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