hibernate4:錯誤:org.hibernate.LazyInitializationException: could not initialize proxy - no Session

在項目中使用hibernate4，進行測試時出現錯誤：

org.hibernate.LazyInitializationException: could not initialize proxy - no Session

at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:164)

at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:285)

at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:185)

at com.tombuu.basic.model.User_$$_javassist_0.getUsername(User_$$_javassist_0.java)

at com.tombuu.basic.util.EntitiesHelper.assertUser(EntitiesHelper.java:12)

at com.tombuu.basic.util.EntitiesHelper.assertUser(EntitiesHelper.java:16)

at com.tombuu.basic.dao.TestUserDao.testLoad(TestUserDao.java:40)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:606)

at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)

at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)

at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)

at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)

at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)

at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)

at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:30)

at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:85)

at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:86)

at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)

at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:241)

at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:87)

at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)

at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)

at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)

at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)

at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)

at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)

at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)

at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:30)

at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)

at org.junit.runners.ParentRunner.run(ParentRunner.java:300)

at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:180)

at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)

at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)

at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:606)

at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)

at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)

at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)

at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)

at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)

錯誤資訊可以看出是延遲加載的錯誤

解決方法：

在beans.xml中加入下面高亮語句

<property name="hibernateProperties">

<props>

<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>

<prop key="hibernate.show_sql">true</prop>

<prop key="hibernate.hbm2ddl.auto">update</prop>

<prop key="hibernate.format_sql">false</prop>

<prop key="hibernate.enable_lazy_load_no_trans">true</prop>

</props>

</property>