ssh junit4測試時列印物件報錯nosession
阿新 • • 發佈:2018-12-09
ssh整合專案,做單元測試時測試hibernate查詢物件關係是否成功時,列印物件報了錯:
org.hibernate.LazyInitializationException: could not initialize proxy - no Session at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:148) at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:266) at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:68) at com.im.domain.Info_$$_jvste59_0.toString(Info_$$_jvste59_0.java) at java.lang.String.valueOf(String.java:2994) at java.io.PrintStream.println(PrintStream.java:821) at com.im.test.HibernateTest.fun4(HibernateTest.java:57) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75) at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86) at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:254) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:89) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:193) 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:538) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)
沒錯就是System.out.println("");,因為測試了其他service方法都沒有報錯,然後發現這個問題:
at java.io.PrintStream.println(PrintStream.java:821)
這是要坑死。
原因:ssh使用了動態代理技術,而列印物件需要呼叫toString方法,導致觸發代理物件中的invoke方法。而在invoke方法中:
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { String methodname = method.getName(); String classname = method.getDeclaringClass().getName(); //獲得和配置檔案的關聯性 Configuration configuration = new Configuration(); //獲得mapper封裝相關內容 Map<String, Mapper> mapperMap = configuration.getMapperMap(); //獲得資料庫連線物件 ComboPooledDataSource dataSource = configuration.getDataSource(); System.out.println("==="); System.out.println("資料來源物件:"+ dataSource); Connection conn = dataSource.getConnection(); Mapper mapper = mapperMap.get(classname + "." + methodname); String sql = mapper.getSqlString(); System.out.println("sql語句"+sql); //處理resultSet List<Object> objects = Execute.selectList(mapper, conn); return objects; }
由於method方法是toString,生成的key值無法在mapperMap找到對應的mapper物件,此時mapper為空。
參考:https://blog.csdn.net/weixin_42583093/article/details/82110059