Question

我有以下单元测试，它给了我一个空指针异常。调试器在创建连接工厂的行之后立即转到finally块。这是测试：

@Test
    public void receiveMessage() throws Exception {
            MessageConsumer consumer = null;
            ConnectionFactory connectionFactory = null;
        Connection connection = null;
        Session session = null;
        Destination destination = null;
            try {
                   connectionFactory = new ActiveMQConnectionFactory(
                        "tcp://localhost:61616");
                 connection = connectionFactory.createConnection("username","pwd");
                 connection.start();
                 session = connection.createSession(true,
                        Session.AUTO_ACKNOWLEDGE);

                 destination = session
                                    .createQueue("myQueue");
                    logger.info("Starting consumer");
                    consumer = session
                                    .createConsumer(destination);

                    Message m = consumer.receive(); 
                    logger.info("Received message:" + m); 
            }


            } catch (Exception e) {
                    logger.error("", e);
            } finally {
                    consumer.close();
                    session.close();
                    connection.stop();
                    connection.close();
            }
    }

这是堆栈跟踪：

java.lang.NullPointerException at ClassName.receiveMessage（ClassName.java:62） at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）at sun.reflect.NativeMethodAccessorImpl.invoke（未知来源）at sun.reflect.DelegatingMethodAccessorImpl.invoke（未知来源）at java.lang.reflect.Method.invoke（未知来源）at org.junit.runners.model.FrameworkMethod $ 1.runReflectiveCall（FrameworkMethod.java:47）在 org.junit.internal.runners.model.ReflectiveCallable.run（ReflectiveCallable.java:12）在 org.junit.runners.model.FrameworkMethod.invokeExplosively（FrameworkMethod.java:44）在 org.junit.internal.runners.statements.InvokeMethod.evaluate（InvokeMethod.java:17）在 org.junit.internal.runners.statements.RunAfters.evaluate（RunAfters.java:27）在org.junit.runners.ParentRunner.runLeaf（ParentRunner.java:271）at org.junit.runners.BlockJUnit4ClassRunner.runChild（BlockJUnit4ClassRunner.java:70）在 org.junit.runners.BlockJUnit4ClassRunner.runChild（BlockJUnit4ClassRunner.java:50）在org.junit.runners.ParentRunner $ 3.run（ParentRunner.java:238）at org.junit.runners.ParentRunner $ 1.schedule（ParentRunner.java:63）at org.junit.runners.ParentRunner.runChildren（ParentRunner.java:236）at at org.junit.runners.ParentRunner.access $ 000（ParentRunner.java:53）at at org.junit.runners.ParentRunner $ 2.evaluate（ParentRunner.java:229）at at org.junit.runners.ParentRunner.run（ParentRunner.java:309）at at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run（JUnit4TestReference.java:50）在 org.eclipse.jdt.internal.junit.runner.TestExecution.run（TestExecution.java:38）在 org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests（RemoteTestRunner.java:459）在 org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests（RemoteTestRunner.java:675）在 org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run（RemoteTestRunner.java:382）在 org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main（RemoteTestRunner.java:192

）

Answer 1

在单元测试中，不应使用实际连接，即您尝试在单元测试用例中连接到BrokerURL，而不是单元测试的用途。

在这种情况下，您需要使用Easymock+Powermock或Mockito

等库来模拟外部连接

关于空指针异常，你的经纪人是吗？和用户名，密码正确，请检查这些

在activemq上调试单元测试时获取nullpointer异常

1 个答案: