Hibernate加载配置文件的两种方法
(一)：configuration.configure();（默认加载src下的hibernate.cfg.xml文件）
1 private static SessionFactory sessionFactory = null; 2 3 static{ 4 Configuration configuration = new Configuration(); 5 configuration.configure(); 6 sessionFactory = configuration.buildSessionFactory(); 7 }
如果使用了这种加载方法那么在hibernate.cfg.xml文件中就需要mapping XX.hbm.xml文件了
<session-factory>
<mapping resource="domain/Students.hbm.xml"/>
<mapping resource="domain/Techer.hbm.xml"/>
</session-factory>
（二）：使用的是configuration.addClass(class);方法
1 private static SessionFactory sessionFactory = null; 2 3 static { 4 5 Configuration configuration = new Configuration(); 6 configuration.configure(); 7 8 configuration.addClass(Techer.class); 9 configuration.addClass(Students.class); 10 11 sessionFactory = configuration.buildSessionFactory(); 12 }
如果使用了这种那么在hibernate.cfg.xml文件中就不需要mapping了。
如果既使用了addClass方法也在cfg.xml文件中添加了mapping就会如下错误：
1 java.lang.ExceptionInInitializerError 2 at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 3 at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) 4 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) 5 at java.lang.reflect.Constructor.newInstance(Constructor.java:525) 6 at org.junit.runners.BlockJUnit4ClassRunner.createTest(BlockJUnit4ClassRunner.java:209) 7 at org.junit.runners.BlockJUnit4ClassRunner$1.runReflectiveCall(BlockJUnit4ClassRunner.java:258) 8 at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) 9 at org.junit.runners.BlockJUnit4ClassRunner.methodBlock(BlockJUnit4ClassRunner.java:255) 10 at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79) 11 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71) 12 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49) 13 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) 14 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) 15 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) 16 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) 17 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) 18 at org.junit.runners.ParentRunner.run(ParentRunner.java:236) 19 at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) 20 at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) 21 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) 22 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) 23 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) 24 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) 25 Caused by: org.hibernate.InvalidMappingException: Could not parse mapping document from resource domain/Techer.hbm.xml 26 at org.hibernate.cfg.Configuration.addResource(Configuration.java:641) 27 at org.hibernate.cfg.Configuration.addClass(Configuration.java:688) 28 at dao.App.<clinit>(App.java:17) 29 ... 23 more 30 Caused by: org.hibernate.DuplicateMappingException: Duplicate class/entity mapping domain.Techer 31 at org.hibernate.cfg.Configuration$MappingsImpl.addClass(Configuration.java:2407) 32 at org.hibernate.cfg.HbmBinder.bindRoot(HbmBinder.java:173) 33 at org.hibernate.cfg.Configuration.add(Configuration.java:771) 34 at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:606) 35 at org.hibernate.cfg.Configuration.addResource(Configuration.java:638) 36 ... 25 more
