org.hibernate.ObjectNotFoundException: No row with the given identifier exists解决

最新推荐文章于 2020-07-03 16:23:56 发布

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最新推荐文章于 2020-07-03 16:23:56 发布

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分类专栏： Java Web Development Tools

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本文详细解析了在使用Hibernate框架时遇到的ObjectNotFoundException异常原因及其解决方案。通过调整配置文件中的hbm2ddl.auto属性，避免了每次执行操作时重新创建表，确保了数据的正确加载。

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环境

Eclipse Jee-indigo + Hibernate 3.2 + JDK 1.6.31

问题

Hibernate load某个对象出现如下异常：

org.hibernate.ObjectNotFoundException: No row with the given identifier exists: [com.oracle.entities.Dictionary#1]
	at org.hibernate.impl.SessionFactoryImpl$2.handleEntityNotFound(SessionFactoryImpl.java:419)
	at org.hibernate.proxy.AbstractLazyInitializer.checkTargetState(AbstractLazyInitializer.java:154)
	at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:143)
	at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:174)
	at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:190)
	at com.oracle.entities.Dictionary_$$_javassist_0.getName(Dictionary_$$_javassist_0.java)
	at com.oracle.entities.HBTest.testMapLoad(HBTest.java:130)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
	at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

解决

报这个异常很大原因是该对象不存在，在testMap这个方法里保存数据，在testMapLoad这个方法里加载数据，思考下为什么数据会不存在。原来是在Dictionary.hbm.xml这个配置文件中做了如下配置：

<property name="hbm2ddl.auto">create</property>

这样配置后就会出现每次执行操作都会重新创建表，在testMapLoad里只加载没插入数据自然就找不到了。于是解决办法这样：先执行testMap这个方法保存数据，然后把

<property name="hbm2ddl.auto">create</property>改成

<property name="hbm2ddl.auto">update</property>，再重新运行testMapLoad自然就不会报此异常了。

//代码片段
@Test
	public void testMap(){

		Map words=new HashMap();
		words.put("hello", "你好");
		words.put("ok", "是");
		
		Dictionary dic=new Dictionary();
		dic.setName("eng");
		dic.setPublisher("william");
		dic.setWords(words);
		
		session.save(dic);
	}
	@Test
	public void testMapLoad(){
		Dictionary dic = new Dictionary();
		dic = (Dictionary)session.load(Dictionary.class, 1);
		System.out.println(dic.getName());
		Map words=new HashMap();
		words = dic.getWords();
		System.out.println(words.isEmpty());
		System.out.println(words.get("ok"));
	}