Question

该应用程序基于OSGI。我有一个自定义注释转换器：

package com.domain.bundle1.web.camel.converters;

import ...;

@Converter
public class FooTransferObjectConverter {
    public FooTransferObjectConverter() {
    }

    @Converter
    public static FooTransferObject toFooTransferObject(Foo foo, Exchange exchange) throws Exception {
        // some magic
        return fooTransferObject;
    }
}

我还在TypeConverter文件中声明了它所包含的包：

http://i.stack.imgur.com/U3QQH.png

包含：

com.domain.bundle1.web.camel.converters

camel-context文件包含下一个代码：

<log loggingLevel="INFO" message="Converting to FooTransferObject" />
<convertBodyTo type="com.domain.bundle2.model.FooTransferObject" />
<log loggingLevel="INFO" message="Converted!" />

在转换之前，消息正文是Foo对象。

但是当进程转换时，会引发异常：

Failed delivery for (MessageId: ID-EPUALVIW0567-55536-1401106375216-26-5 on ExchangeId: ID-EPUALVIW0567-55536-1401106375216-26-6).    
Exhausted after delivery attempt: 1 caught: org.apache.camel.InvalidPayloadException: No body available of type: com.domain.bundle2.model.FooTransferObject but has value: Foo{97, Wall, null, null} of type: com.domain.bundle3.model.Foo on: Message: Foo{97, Wall, null, null}. 
Caused by: Error during type conversion from type: com.domain.bundle3.model.Foo to the required type: com.domain.bundle2.model.FooTransferObject with value Foo{97, Wall, null, null} due 6 counts of IllegalAnnotationExceptions. Exchange[Message: Foo{97, Wall, null, null}]. Caused by: [org.apache.camel.TypeConversionException - Error during type conversion from type: Foo{97, Wall, null, null} to the required type: com.domain.bundle2.model.FooTransferObjec with value....

然后由自定义处理程序缓存异常，然后我发现了这个：

    Caused by: javax.xml.bind.MarshalException
 - with linked exception:
[com.sun.istack.internal.SAXException2: A cycle is detected in the object graph. This will cause infinitely deep XML: freebaseball SpeedKick  -> fr????f????tb??ll Sp????dK??ck  -> free
football SpeedKick ]
        at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:311)[:1.7.0_40]
        at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:236)[:1.7.0_40]
        at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshallerImpl.java:95)
        at org.apache.camel.converter.jaxb.FallbackTypeConverter.marshall(FallbackTypeConverter.java:238)
        at org.apache.camel.converter.jaxb.FallbackTypeConverter.convertTo(FallbackTypeConverter.java:95)
        ... 163 more
Caused by: com.sun.istack.internal.SAXException2: A cycle is detected in the object graph. This will cause infinitely deep XML: freebaseball SpeedKick  -> fr????f????tb??ll Sp????dK??c
k  -> freebaseball SpeedKick
        at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.reportError(XMLSerializer.java:237)[:1.7.0_40]

您如何看待问题是什么？如何在TypeConverterRegistry中看到加载的转换器？

Answer 1

我已经解决了我的问题。 FallbackTypeConverter开始工作，因为camel没有加载我的自定义常规类型转换器。我在调试模式下检查了TypeConverterRegister中的转换器映射，但没找到我的FooTransferObjectConverter。

问题出在文件TypeConverter中。我只是将转换器类的名称添加到路径，然后将其加载到注册表。

com.domain.bundle1.web.camel.converters.FooTransferObjectConverter

应用程序中的Camel版本 - 2.11.1。在下面写的camel docs中：

在Camel 2.8中，我们改进了类型转换器加载器以支持指定转换器类的FQN类名称。这有避免必须扫描@Converter类的包的优点。相反，它直接加载@Converter类。这是一个很高的建议使用前进的方法。

但我尝试运行application from chapter 3 (from 'Camel in action' book) with custom converter。文件TypeConverter仅包含在包路径中。

Camel类型转换器失败：InvalidPayloadException：没有可用的类型

1 个答案: