org.apache.camel.NoTypeConversionAvailableException：没有类型转换器可用于转换类型： [英] org.apache.camel.NoTypeConversionAvailableException: No type converter available to convert from type:
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问题描述
我首先拥有多部分文件，我想将其发送到camel管道并使用原始名称保存此文件。
I have multipart file in the first place and I want to send it to camel pipeline and save this file with original name.
我的代码：
@Autowired
ProducerTemplate producerTemplate;
...
producerTemplate.sendBody("seda:rest_upload", multipartFile);
另一方面我有：
from（seda：rest_upload）。。undvertBodyTo（File.class）.to（file：// rest_files）;
from("seda:rest_upload").convertBodyTo(File.class).to("file://rest_files");
而且我尝试注册转换器：
@Converter
public class MultiPartFileToFileConvertor {
@Converter
public static File toFile(MultipartFile multipartFile) throws IOException {
File convFile = new File(multipartFile.getOriginalFilename());
multipartFile.transferTo(convFile);
return convFile;
}
}
当我执行我的代码时，我看到以下stacktrace：
When I execute my code I see following stacktrace:
Message History
---------------------------------------------------------------------------------------------------------------------------------------
RouteId ProcessorId Processor Elapsed (ms)
[route2 ] [route2 ] [seda://rest_upload ] [ 3]
[route2 ] [convertBodyTo1 ] [convertBodyTo[java.io.File] ] [ 2]
Stacktrace
---------------------------------------------------------------------------------------------------------------------------------------
org.apache.camel.InvalidPayloadException: No body available of type: java.io.File but has value: org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile@24c9ecc7 of type: org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.StandardMultipartFile on: Message[ID-ntkachev-1509013331141-0-13]. Caused by: No type converter available to convert from type: org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.StandardMultipartFile to the required type: java.io.File with value org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile@24c9ecc7. Exchange[ID-ntkachev-1509013331141-0-14]. Caused by: [org.apache.camel.NoTypeConversionAvailableException - No type converter available to convert from type: org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.StandardMultipartFile to the required type: java.io.File with value org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile@24c9ecc7]
at org.apache.camel.impl.MessageSupport.getMandatoryBody(MessageSupport.java:113) ~[camel-core-2.20.0.jar:2.20.0]
at org.apache.camel.processor.ConvertBodyProcessor.process(ConvertBodyProcessor.java:91) ~[camel-core-2.20.0.jar:2.20.0]
at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:548) ~[camel-core-2.20.0.jar:2.20.0]
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:201) [camel-core-2.20.0.jar:2.20.0]
at org.apache.camel.processor.Pipeline.process(Pipeline.java:138) [camel-core-2.20.0.jar:2.20.0]
at org.apache.camel.processor.Pipeline.process(Pipeline.java:101) [camel-core-2.20.0.jar:2.20.0]
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:201) [camel-core-2.20.0.jar:2.20.0]
at org.apache.camel.component.seda.SedaConsumer.sendToConsumers(SedaConsumer.java:298) [camel-core-2.20.0.jar:2.20.0]
at org.apache.camel.component.seda.SedaConsumer.doRun(SedaConsumer.java:210) [camel-core-2.20.0.jar:2.20.0]
at org.apache.camel.component.seda.SedaConsumer.run(SedaConsumer.java:155) [camel-core-2.20.0.jar:2.20.0]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_111]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_111]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_111]
Caused by: org.apache.camel.NoTypeConversionAvailableException: No type converter available to convert from type: org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.StandardMultipartFile to the required type: java.io.File with value org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile@24c9ecc7
at org.apache.camel.impl.converter.BaseTypeConverterRegistry.mandatoryConvertTo(BaseTypeConverterRegistry.java:206) ~[camel-core-2.20.0.jar:2.20.0]
at org.apache.camel.impl.MessageSupport.getMandatoryBody(MessageSupport.java:111) ~[camel-core-2.20.0.jar:2.20.0]
... 12 common frames omitted
2017-10-26 13:30:58.447 WARN 19608 --- [a://rest_upload] o.a.camel.component.seda.SedaConsumer : Error processing exchange. Exchange[]. Caused by: [org.apache.camel.InvalidPayloadException - No body available of type: java.io.File but has value: org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile@24c9ecc7 of type: org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.StandardMultipartFile on: Message[ID-ntkachev-1509013331141-0-13]. Caused by: No type converter available to convert from type: org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.StandardMultipartFile to the required type: java.io.File with value org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile@24c9ecc7. Exchange[ID-ntkachev-1509013331141-0-14]. Caused by: [org.apache.camel.NoTypeConversionAvailableException - No type converter available to convert from type: org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.StandardMultipartFile to the required type: java.io.File with value org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile@24c9ecc7]]
org.apache.camel.InvalidPayloadException: No body available of type: java.io.File but has value: org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile@24c9ecc7 of type: org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.StandardMultipartFile on: Message[ID-ntkachev-1509013331141-0-13]. Caused by: No type converter available to convert from type: org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.StandardMultipartFile to the required type: java.io.File with value org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile@24c9ecc7. Exchange[ID-ntkachev-1509013331141-0-14]. Caused by: [org.apache.camel.NoTypeConversionAvailableException - No type converter available to convert from type: org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.StandardMultipartFile to the required type: java.io.File with value org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile@24c9ecc7]
at org.apache.camel.impl.MessageSupport.getMandatoryBody(MessageSupport.java:113) ~[camel-core-2.20.0.jar:2.20.0]
at org.apache.camel.processor.ConvertBodyProcessor.process(ConvertBodyProcessor.java:91) ~[camel-core-2.20.0.jar:2.20.0]
at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:548) ~[camel-core-2.20.0.jar:2.20.0]
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:201) ~[camel-core-2.20.0.jar:2.20.0]
at org.apache.camel.processor.Pipeline.process(Pipeline.java:138) ~[camel-core-2.20.0.jar:2.20.0]
at org.apache.camel.processor.Pipeline.process(Pipeline.java:101) ~[camel-core-2.20.0.jar:2.20.0]
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:201) ~[camel-core-2.20.0.jar:2.20.0]
at org.apache.camel.component.seda.SedaConsumer.sendToConsumers(SedaConsumer.java:298) [camel-core-2.20.0.jar:2.20.0]
at org.apache.camel.component.seda.SedaConsumer.doRun(SedaConsumer.java:210) [camel-core-2.20.0.jar:2.20.0]
at org.apache.camel.component.seda.SedaConsumer.run(SedaConsumer.java:155) [camel-core-2.20.0.jar:2.20.0]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_111]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_111]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_111]
Caused by: org.apache.camel.NoTypeConversionAvailableException: No type converter available to convert from type: org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.StandardMultipartFile to the required type: java.io.File with value org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile@24c9ecc7
at org.apache.camel.impl.converter.BaseTypeConverterRegistry.mandatoryConvertTo(BaseTypeConverterRegistry.java:206) ~[camel-core-2.20.0.jar:2.20.0]
at org.apache.camel.impl.MessageSupport.getMandatoryBody(MessageSupport.java:111) ~[camel-core-2.20.0.jar:2.20.0]
... 12 common frames omitted
如何解决此问题？
推荐答案
您必须添加名为TypeConverter的服务发现文件在META-INF目录中。
You have to add the service discovery file named TypeConverter in the META-INF directory.
src\main\resources\META-INF\services\org\apache\camel\TypeConverter
此文件包含
@Converter类的完全限定名称。
This file contains the fully qualified name of the @Converter class.
例如
mypackage.MultiPartFileToFileConvertor
另请参阅Github中的Camel in action 2中的示例 https://github.com/camelinaction/camelinaction2/tree/b6a43abf9e0d4ec4e3753ebd735bb3448f98194b/chapter3/converter 。
Also see the example from Camel in action 2 in Github https://github.com/camelinaction/camelinaction2/tree/b6a43abf9e0d4ec4e3753ebd735bb3448f98194b/chapter3/converter .
此外，第3.6章还解释了自定义转换器的发现和加载如何充分发挥作用。
Also the book Chapter 3.6 explains how the discovery and loading of custom converters work in full detail.
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