使用camelestSupport的CAMEL单元测试，模板始终为空

素材狗 2022-01-01 17:23:37 文章分类：Java问题点击数：4次

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Camel unit test with cameltestsupport, template is always null(使用camelestSupport的CAMEL单元测试，模板始终为空)

本文介绍了使用camelestSupport的CAMEL单元测试，模板始终为空的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在使用Camel进行一个简单的单元测试。我想要做的就是从一个文件(在资源下)中读取JSON内容，将其发送到Java类进行验证--这就是我正在尝试测试的方法。无论我做什么，模板(我用来sendBody(Json))总是空的。以下是我的代码：

public class RouteTests extends CamelTestSupport {

    @EndpointInject(uri = "mock:result")
    protected MockEndpoint resultEndpoint;

    @Produce(uri = "direct:start")
    protected ProducerTemplate template;

    @Autowired
    JSONObject testJson;

    @Before
    public void setUp() throws Exception {
        try {
            final ObjectMapper objectmapper = new ObjectMapper();
            final ClassLoader loader = Thread.currentThread().getContextClassLoader();
            final InputStream stream = loader.getResourceAsStream("test.json");
            testJson = new JSONObject ((Map)objectmapper.readValue(stream, Map.class));

            // Start Camel
            context = new DefaultCamelContext();
            context.addRoutes(createRouteBuilder());
            context.start();
        }
        catch (IOException e) {
        }
    }

    @Test
    public void testSendMatchingMessage() throws Exception {
        //resultEndpoint.expectedBodiesReceived(expectedBody);
        resultEndpoint = getMockEndpoint("mock:result");
        //resultEndpoint = context.getEndpoint("mock:result", MockEndpoint.class);
        resultEndpoint.expectedMessageCount(1);
        template.sendBody("direct:start", testJson);
        resultEndpoint.assertIsSatisfied();
    }

    @Override
    protected RouteBuilder createRouteBuilder() {
        return new RouteBuilder() {
            public void configure() {
                from("direct:start")
                        .filter().method(ValidationProcessor.class, "validate")
                        .to("mock:result");
            }
        };
    }

    @Override
    protected JndiRegistry createRegistry() throws Exception {
        JndiRegistry jndi = super.createRegistry();
        jndi.bind("ValidationProcessor", new ValidationProcessor", ());

        return jndi;
    }
}

我面临的问题：

最初，结果终结点也始终为空。(我用FilterTest.java作为参考)。然后我不得不做了一个明确的
```
 resultEndpoint = getMockEndpoint("mock:result");
```
以解决该问题。
然后我读到我必须覆盖createRegistry，但我不知道如何绑定。我只是使用了我的验证类的名称，但我不知道这是否正确。

但模板始终为空。null pointer exception(NPE)位于
```
 template.sendBody("direct:start", testJson);
```

如有必要，也请指点我一些读物。Apache Camel文档链接到的参考代码甚至没有我在Setup方法中所做的Camel的启动。

推荐答案

我认为您错过了CamelTestSupport为您提供的许多真正有用的东西。它有自己的setUp方法，您应该重写它。我相信你的测试应该是这样的：

public class RouteTests extends CamelTestSupport {

    private JSONObject testJson;

    @Override
    public void setUp() throws Exception {
        // REALLY important to call super
        super.setUp();

        ObjectMapper objectmapper = new ObjectMapper();
        ClassLoader loader = Thread.currentThread().getContextClassLoader();
        InputStream stream = loader.getResourceAsStream("test.json");
        testJson = new JSONObject(objectmapper.readValue(stream, Map.class));
    }

    @Override
    protected RouteBuilder createRouteBuilder() {
        return new RouteBuilder() {
            @Override
            public void configure() {
                from("direct:start")
                        .filter().method(ValidationProcessor.class, "validate")
                        .to("mock:result");
            }
        };
    }

    @Test
    public void testSendMatchingMessage() throws Exception {
        MockEndpoint resultEndpoint = getMockEndpoint("mock:result");
        resultEndpoint.expectedMessageCount(1);
        template.sendBody("direct:start", testJson);
        resultEndpoint.assertIsSatisfied();
    }
}

实际上，我会完全删除setUp的覆盖，并将测试数据的读取放入测试方法本身。这样，数据的用途就很清楚了，您可以删除testJson字段。

public class RouteTests extends CamelTestSupport {

    @Override
    protected RouteBuilder createRouteBuilder() {
        return new RouteBuilder() {
            @Override
            public void configure() {
                from("direct:start")
                        .filter().method(ValidationProcessor.class, "validate")
                        .to("mock:result");
            }
        };
    }

    @Test
    public void testSendMatchingMessage() throws Exception {
        ObjectMapper objectmapper = new ObjectMapper();
        ClassLoader loader = Thread.currentThread().getContextClassLoader();
        InputStream stream = loader.getResourceAsStream("test.json");
        JSONObject testJson = new JSONObject(objectmapper.readValue(stream, Map.class));

        MockEndpoint resultEndpoint = getMockEndpoint("mock:result");
        resultEndpoint.expectedMessageCount(1);
        template.sendBody("direct:start", testJson);
        resultEndpoint.assertIsSatisfied();
    }
}