我目前正在尝试Apache Camel 2.14.0版本的新REST DSL。正如这篇文章的标题所说,我与Stringbean发生了冲突。让我们看看哪里出了问题。
以下是一个简化为测试用例的有效XML文件。它只定义了一个Stringbean和一个Camel上下文,其中包含一个rest端点和由rest端点调用的单个路由。
<?xml version="1.0" encoding="UTF-8"?>
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://camel.apache.org/schema/spring
http://camel.apache.org/schema/spring/camel-spring.xsd"
>
<bean id="source-directory" class="java.lang.String">
<constructor-arg type="java.lang.String" value="file:/opt/a/directory/data/audio" />
</bean>
<camelContext id="camelContext" xmlns="http://camel.apache.org/schema/spring">
<dataFormats>
<json id="jack" library="Jackson" unmarshalTypeName="org.apache.camel.component.jackson.TestPojo"/>
</dataFormats>
<restConfiguration bindingMode="json" component="restlet" port="5117" />
<rest path="/rest-api/">
<get uri="/{words}/" consumes="application/json" produces="application/json">
<to uri="direct:words" />
</get>
</rest>
<route>
<from uri="direct:words" />
<transform>
<simple>${headers.words}</simple>
</transform>
</route>
</camelContext>
</beans>
为了加载和测试这个Camel上下文,我使用了以下测试用例:
import org.apache.camel.CamelContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
public class Test {
@org.junit.Test
public void testT() throws Exception {
final FileSystemXmlApplicationContext bean = new FileSystemXmlApplicationContext("src/test/resources/camelContext.xml");
final CamelContext context = bean.getBean("camelContext", CamelContext.class);
context.start();
Thread.yield();
Thread.sleep(600000);
}
}
它目前导致以下错误:
org.apache.camel.RuntimeCamelException: org.apache.camel.FailedToCreateRouteException: Failed to create route route2 at: >>> RestBinding <<< in route: Route(route2)[[From[rest:get:/rest-api/:/{words}/?produces=a... because of Provider com.sun.xml.bind.v2.ContextFactory could not be instantiated: javax.xml.bind.JAXBException: "file" ne contient pas ObjectFactory.class ou jaxb.index
也就是说,"文件"不包含ObjectFactory.class或jaxb.index
移除source-directory
bean声明或rest端点声明似乎解决了问题,因此它们之间似乎存在不兼容;但是,作为一个Camel新手,我不知道问题出在哪里。
有人能给我线索吗?我做错什么了吗?
提前感谢,亚瑟。
我认为这个问题的发生是由于您为单元测试加载Spring和Camel上下文的机制。请考虑使用CamelTestSupport。
我用这个范例重写了这个测试,一切都很好。
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "/META-INF/spring/camel-context.xml" })
public class Test extends CamelTestSupport {
@org.junit.Test
public void testT() throws Exception {
CloseableHttpClient httpClient = HttpClientBuilder.create().build();
CloseableHttpResponse response = httpClient.execute(new HttpGet(
"http://localhost:5117/rest-api/hello"));
assertEquals(200, response.getStatusLine().getStatusCode());
assertEquals(""hello"", new BufferedReader(new InputStreamReader(response.getEntity()
.getContent(), StandardCharsets.UTF_8)).readLine());
}
@Override
protected RouteBuilder createRouteBuilder() throws Exception {
return new RouteBuilder()
{
@Override
public void configure() throws Exception {
from("direct:words").transform().simple("${headers.words}");
}
};
}
}
多亏了一位队友,我终于明白了这个错误。
问题来自camel上下文中"java.lang.String"bean的定义。放置时
<bean id="source" class="java.lang.String">
<constructor-arg type="java.lang.String" value="file:/opt/a/directory/data/audio" />
</bean>
在camel上下文中,我得到了以下日志:
[main] JaxbDataFormat INFO Creating JAXBContext with contextPath: file:/opt/a/directory/data/audio and ApplicationContextClassLoader: sun.misc.Launcher$AppClassLoader@3485def8
我对这种情况的理解是,如果定义了任何java.lang.String
对象,那么它就会被JAXBContext
用作工厂标识符。他们可能会寻找一个通常总是null
的@Autowired String
属性。将"源"bean替换为将我的sting封装在属性中的bean可以解决问题。
发现意外副作用!