Question

我有一个我用作camel proxy Using Camel Proxy的界面。我的路线如下：

from("direct:services")
        .onException(Exception.class)
        .process(new Processor() {
            @Override
            public void process(Exchange arg0) throws Exception {
                Exception e = arg0.getProperty(Exchange.EXCEPTION_CAUGHT, Exception.class);
                    LOGGER.error(e, e.getMessage());
            }
        }).handled(true).end()
        .setHeader(Exchange.HTTP_URI, simple("${body.url}"))
        .setHeader(Exchange.HTTP_METHOD,simple("${body.httpMethod}"))
        .setHeader(Exchange.CONTENT_TYPE, simple("${body.contentType}"))
        .setBody(simple("${body.requestBody}"))
        .choice()
        .when(simple("${body.proxyRequired} == 'true'"))
        .inOut("{{http.urlProxy}}")
        .otherwise()
        .inOut("{{http.url}}")
        .end()
        .setBody(bean(appUtil, "extractResponse"));

界面是：

public interface ApiServices {

    ServiceProviderResponse performOperation(ServiceProviderRequest request);

}

ServiceProviderResponse和ServiceProviderRequest类：

public class ServiceProviderRequest {

    private String url;
    private String requestBody;
    private String httpMethod;
    private String contentType;
    private boolean proxyRequired;
    private Map<String, String> headers;

//getters and setters

}

public class ServiceProviderResponse {

    private int statusCode;
    private String body;
    private String errorMessage;
    private String contentType;
    private String url;

//getters and setters
}

这就是整个事情的运作方式：

@Produce(uri = "direct:services")
ApiServices appServices;

ServiceProviderResponse response =  appServices.performOperation(request);

早些时候我的界面方法是：ServiceProviderResponse performOperation(String url);并且它工作正常（当然我的路线不同）。那么我们不能使用像这样的自定义对象类型吗？我得到的例外：

Caused by: org.apache.camel.InvalidPayloadException: No body available of type: com.common.util.ServiceProviderResponse but has value: BeanInvocation public abstract com.common.util.ServiceProviderResponse com.common.util.ApiServices.performOperation(com.common.util.ServiceProviderRequest) with [com.common.util.ServiceProviderRequest@4ce55b]] of type: org.apache.camel.component.bean.BeanInvocation on: Message: BeanInvocation public abstract com.common.util.ServiceProviderResponse com.common.util.ApiServices.performOperation(com.common.util.ServiceProviderRequest) with [com.common.util.ServiceProviderRequest@4ce55b]]. Caused by: No type converter available to convert from type: org.apache.camel.component.bean.BeanInvocation to the required type: com.common.util.ServiceProviderResponse with value BeanInvocation public abstract com.common.util.ServiceProviderResponse com.common.util.ApiServices.performOperation(com.common.util.ServiceProviderRequest) with [com.common.util.ServiceProviderRequest@4ce55b]]. Exchange[Message: BeanInvocation public abstract com.common.util.ServiceProviderResponse com.common.util.ApiServices.performOperation(com.common.util.ServiceProviderRequest) with [com.common.util.ServiceProviderRequest@4ce55b]]]. Caused by: [org.apache.camel.NoTypeConversionAvailableException - No type converter available to convert from type: org.apache.camel.component.bean.BeanInvocation to the required type: com.common.util.ServiceProviderResponse with value BeanInvocation public abstract com.common.util.ServiceProviderResponse com.common.util.ApiServices.performOperation(com.common.util.ServiceProviderRequest) with [com.common.util.ServiceProviderRequest@4ce55b]]]
    at org.apache.camel.impl.MessageSupport.getMandatoryBody(MessageSupport.java:102)
    at org.apache.camel.component.bean.AbstractCamelInvocationHandler.getBody(AbstractCamelInvocationHandler.java:58)
    at org.apache.camel.component.bean.AbstractCamelInvocationHandler.afterInvoke(AbstractCamelInvocationHandler.java:148)
    at org.apache.camel.component.bean.AbstractCamelInvocationHandler$1.call(AbstractCamelInvocationHandler.java:85)
    at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at org.apache.camel.component.bean.AbstractCamelInvocationHandler.invokeWithbody(AbstractCamelInvocationHandler.java:101)
    at org.apache.camel.component.bean.CamelInvocationHandler.invoke(CamelInvocationHandler.java:44)
    ... 43 more
Caused by: org.apache.camel.NoTypeConversionAvailableException: No type converter available to convert from type: org.apache.camel.component.bean.BeanInvocation to the required type: com.common.util.ServiceProviderResponse with value BeanInvocation public abstract com.common.util.ServiceProviderResponse com.common.util.ApiServices.performOperation(com.common.util.ServiceProviderRequest) with [com.common.util.ServiceProviderRequest@4ce55b]]
    at org.apache.camel.impl.converter.BaseTypeConverterRegistry.mandatoryConvertTo(BaseTypeConverterRegistry.java:147)
    at org.apache.camel.impl.MessageSupport.getMandatoryBody(MessageSupport.java:100)
    ... 50 more

异常说明TypeConverters，我现在还需要实现类型转换器吗？如果是的话怎么办？我已经通过Camel文档进行类型转换器，但我不太了解它。另外我猜大多数人都明白我想要达到的目标，所以如果你们有任何不同的方法来完成这个或一些建议，请发布。

Answer 1

您将邮件正文设置为bean（appUtil，“extractResponse”），这基本上意味着：

'将消息体设置为bean（args）方法返回的对象“

如果appUtil是bean，则extractResponse是返回ServiceProviderResponse实例的方法，而不是：

 .setBody(bean(appUtil, "extractResponse"));

尝试：

//call to bean() as a last thing in your route def
//...
.bean(appUtil, "extractResponse"); // without the wrapping setBody call.

extractResponse应声明为：

ServiceProviderResponse extractResponse(WhateverBodyTypeYouHadOnRoute body) {
    //return ...
}

NoTypeConversionAvailableException：将接口用作Apache Camel Proxy时

1 个答案: