我们在使用DSL for Camel Routes时遇到了一些问题。似乎无法将以下XML配置转换为Groovy（或JAVA）DSL
<route id="myroute" >
<from uri="fromURI" />
<filter>
<xpath>//entity[contains(@destinations, 'databasedestination')]</xpath>
<filter>
<xpath>//entity[@objectType = 'objectType']</xpath>
<camel:setHeader headerName="bodyTemp">
<simple>${body}</simple>
</camel:setHeader>
<filter>
<xpath>//entity[@command = 'add']</xpath>
<convertBodyTo type="com.foo.bar.Entity" />
<bean ref="handler" method="add" />
</filter>
<filter>
<xpath>//entity[@command = 'foo']</xpath>
<convertBodyTo type="com.foo.bar.Entity" />
<bean ref="handler" method="foo" />
</filter>
<filter>
<xpath>//entity[@command = 'bar']</xpath>
<convertBodyTo type="com.foo.bar.Entity" />
<bean ref="handler" method="bar" />
</filter>
<to uri="toURI" />
</filter>
</filter>
</route>
Wie试图在基于Groovy的RouteBuilder中进行翻译，如下所示：
from("fromURI")
.filter().xpath('//entity[contains(@destinations, \'databasedestination\')]')
.setHeader("bodyTemp", simple('${body}'))
.filter().xpath('//entity[@objectType = \'objectType\']')
.filter().xpath('//entity[@command = \'add\']')
.convertBodyTo(com.foo.bar.Entity)
.bean(handler, "add")
.end()
.filter().xpath('//entity[@command = \'foo\']')
.convertBodyTo(com.foo.bar.Entity)
.bean(handler, "foo")
.end()
.filter().xpath('//entity[@command = \'bar\']')
.convertBodyTo(com.foo.bar.Entity)
.bean(handler, "bar")
.end()
.to("toURI")
.end()
.end()
但这显然不起作用。我们收到javax.xml.xpath.XPathExpressionException消息：Invalid xpath: //entity[@command = 'foo']
同时查看相应的堆栈跟踪。
->> 814 | doInEvaluateAs in org.apache.camel.builder.xml.XPathBuilder
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 697 | evaluateAs in ''
| 139 | matches . . . . . . in ''
| 47 | process in org.apache.camel.processor.FilterProcessor
| 73 | process . . . . . . in org.apache.camel.util.AsyncProcessorHelper
| 99 | processNext in org.apache.camel.processor.DelegateAsyncProcessor
| 90 | process . . . . . . in ''
| 73 | process in org.apache.camel.management.InstrumentationProcessor
| 99 | processNext . . . . in org.apache.camel.processor.DelegateAsyncProcessor
| 90 | process in ''
| 91 | process . . . . . . in org.apache.camel.processor.interceptor.TraceInterceptor
| 73 | process in org.apache.camel.util.AsyncProcessorHelper
| 330 | processErrorHandler in org.apache.camel.processor.RedeliveryErrorHandler
| 220 | process in ''
| 45 | processNext . . . . in org.apache.camel.processor.RouteContextProcessor
| 90 | process in org.apache.camel.processor.DelegateAsyncProcessor
| 303 | process . . . . . . in org.apache.camel.processor.interceptor.DefaultChannel
| 73 | process in org.apache.camel.util.AsyncProcessorHelper
| 117 | process . . . . . . in org.apache.camel.processor.Pipeline
| 80 | process in ''
| 45 | processNext . . . . in org.apache.camel.processor.RouteContextProcessor
| 90 | process in org.apache.camel.processor.DelegateAsyncProcessor
| 150 | processAsync . . . in org.apache.camel.processor.UnitOfWorkProcessor
| 117 | process in ''
| 48 | processNext . . . . in org.apache.camel.processor.RouteInflightRepositoryProcessor
| 90 | process in org.apache.camel.processor.DelegateAsyncProcessor
| 73 | process . . . . . . in org.apache.camel.util.AsyncProcessorHelper
| 99 | processNext in org.apache.camel.processor.DelegateAsyncProcessor
| 90 | process . . . . . . in ''
| 73 | process in org.apache.camel.management.InstrumentationProcessor
| 99 | process . . . . . . in org.apache.camel.util.AsyncProcessorHelper
| 86 | process in org.apache.camel.processor.DelegateAsyncProcessor
| 105 | onMessage . . . . . in org.apache.camel.component.jms.EndpointMessageListener
| 1110 | runWorker in java.util.concurrent.ThreadPoolExecutor
| 603 | run . . . . . . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^ 722 | run in java.lang.Thread
Caused by XPathExpressionException: null
->> 200 | evaluate in com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 800 | doInEvaluateAs in org.apache.camel.builder.xml.XPathBuilder
| 697 | evaluateAs . . . . in ''
| 139 | matches in ''
| 47 | process . . . . . . in org.apache.camel.processor.FilterProcessor
| 73 | process in org.apache.camel.util.AsyncProcessorHelper
| 99 | processNext . . . . in org.apache.camel.processor.DelegateAsyncProcessor
| 90 | process in ''
| 73 | process . . . . . . in org.apache.camel.management.InstrumentationProcessor
| 99 | processNext in org.apache.camel.processor.DelegateAsyncProcessor
| 90 | process . . . . . . in ''
| 91 | process in org.apache.camel.processor.interceptor.TraceInterceptor
| 73 | process . . . . . . in org.apache.camel.util.AsyncProcessorHelper
| 330 | processErrorHandler in org.apache.camel.processor.RedeliveryErrorHandler
| 220 | process . . . . . . in ''
| 45 | processNext in org.apache.camel.processor.RouteContextProcessor
| 90 | process . . . . . . in org.apache.camel.processor.DelegateAsyncProcessor
| 303 | process in org.apache.camel.processor.interceptor.DefaultChannel
| 73 | process . . . . . . in org.apache.camel.util.AsyncProcessorHelper
| 117 | process in org.apache.camel.processor.Pipeline
| 80 | process . . . . . . in ''
| 45 | processNext in org.apache.camel.processor.RouteContextProcessor
| 90 | process . . . . . . in org.apache.camel.processor.DelegateAsyncProcessor
| 150 | processAsync in org.apache.camel.processor.UnitOfWorkProcessor
| 117 | process . . . . . . in ''
| 48 | processNext in org.apache.camel.processor.RouteInflightRepositoryProcessor
| 90 | process . . . . . . in org.apache.camel.processor.DelegateAsyncProcessor
| 73 | process in org.apache.camel.util.AsyncProcessorHelper
| 99 | processNext . . . . in org.apache.camel.processor.DelegateAsyncProcessor
| 90 | process in ''
| 73 | process . . . . . . in org.apache.camel.management.InstrumentationProcessor
| 99 | process in org.apache.camel.util.AsyncProcessorHelper
| 86 | process . . . . . . in org.apache.camel.processor.DelegateAsyncProcessor
| 105 | onMessage in org.apache.camel.component.jms.EndpointMessageListener
| 1110 | runWorker . . . . . in java.util.concurrent.ThreadPoolExecutor
| 603 | run in java.util.concurrent.ThreadPoolExecutor$Worker
^ 722 | run . . . . . . . . in java.lang.Thread
Caused by TransformerException: Unable to evaluate expression using this context
->> 367 | execute in com.sun.org.apache.xpath.internal.XPath
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 129 | eval in com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl
| 105 | eval . . . . . . . in ''
| 187 | evaluate in ''
| 800 | doInEvaluateAs . . in org.apache.camel.builder.xml.XPathBuilder
| 697 | evaluateAs in ''
| 139 | matches . . . . . . in ''
| 47 | process in org.apache.camel.processor.FilterProcessor
| 73 | process . . . . . . in org.apache.camel.util.AsyncProcessorHelper
| 99 | processNext in org.apache.camel.processor.DelegateAsyncProcessor
| 90 | process . . . . . . in ''
| 73 | process in org.apache.camel.management.InstrumentationProcessor
| 99 | processNext . . . . in org.apache.camel.processor.DelegateAsyncProcessor
| 90 | process in ''
| 91 | process . . . . . . in org.apache.camel.processor.interceptor.TraceInterceptor
| 73 | process in org.apache.camel.util.AsyncProcessorHelper
| 330 | processErrorHandler in org.apache.camel.processor.RedeliveryErrorHandler
| 220 | process `enter code here`in ''
| 45 | processNext . . . . in org.apache.camel.processor.RouteContextProcessor
| 90 | process in org.apache.camel.processor.DelegateAsyncProcessor
| 303 | process . . . . . . in org.apache.camel.processor.interceptor.DefaultChannel
| 73 | process in org.apache.camel.util.AsyncProcessorHelper
| 117 | process . . . . . . in org.apache.camel.processor.Pipeline
| 80 | process in ''
| 45 | processNext . . . . in org.apache.camel.processor.RouteContextProcessor
| 90 | process in org.apache.camel.processor.DelegateAsyncProcessor
| 150 | processAsync . . . in org.apache.camel.processor.UnitOfWorkProcessor
| 117 | process in ''
| 48 | processNext . . . . in org.apache.camel.processor.RouteInflightRepositoryProcessor
| 90 | process in org.apache.camel.processor.DelegateAsyncProcessor
| 73 | process . . . . . . in org.apache.camel.util.AsyncProcessorHelper
| 99 | processNext in org.apache.camel.processor.DelegateAsyncProcessor
| 90 | process . . . . . . in ''
| 73 | process in org.apache.camel.management.InstrumentationProcessor
| 99 | process . . . . . . in org.apache.camel.util.AsyncProcessorHelper
| 86 | process in org.apache.camel.processor.DelegateAsyncProcessor
| 105 | onMessage . . . . . in org.apache.camel.component.jms.EndpointMessageListener
| 1110 | runWorker in java.util.concurrent.ThreadPoolExecutor
| 603 | run . . . . . . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^ 722 | run in java.lang.Thread
Caused by RuntimeException: Unable to evaluate expression using this context
->> 266 | setRoot in com.sun.org.apache.xpath.internal.axes.NodeSequence
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 214 | execute in com.sun.org.apache.xpath.internal.axes.LocPathIterator
| 339 | execute . . . . . . in com.sun.org.apache.xpath.internal.XPath
| 129 | eval in com.sun.org.apache.xpath.internal.jaxp.XPathExpressionImpl
| 105 | eval . . . . . . . in ''
| 187 | evaluate in ''
| 800 | doInEvaluateAs . . in org.apache.camel.builder.xml.XPathBuilder
| 697 | evaluateAs in ''
| 139 | matches . . . . . . in ''
| 47 | process in org.apache.camel.processor.FilterProcessor
| 73 | process . . . . . . in org.apache.camel.util.AsyncProcessorHelper
| 99 | processNext in org.apache.camel.processor.DelegateAsyncProcessor
| 90 | process . . . . . . in ''
| 73 | process in org.apache.camel.management.InstrumentationProcessor
| 99 | processNext . . . . in org.apache.camel.processor.DelegateAsyncProcessor
| 90 | process in ''
| 91 | process . . . . . . in org.apache.camel.processor.interceptor.TraceInterceptor
| 73 | process in org.apache.camel.util.AsyncProcessorHelper
| 330 | processErrorHandler in org.apache.camel.processor.RedeliveryErrorHandler
| 220 | process in ''
| 45 | processNext . . . . in org.apache.camel.processor.RouteContextProcessor
| 90 | process in org.apache.camel.processor.DelegateAsyncProcessor
| 303 | process . . . . . . in org.apache.camel.processor.interceptor.DefaultChannel
| 73 | process in org.apache.camel.util.AsyncProcessorHelper
| 117 | process . . . . . . in org.apache.camel.processor.Pipeline
| 80 | process in ''
| 45 | processNext . . . . in org.apache.camel.processor.RouteContextProcessor
| 90 | process in org.apache.camel.processor.DelegateAsyncProcessor
| 150 | processAsync . . . in org.apache.camel.processor.UnitOfWorkProcessor
| 117 | process in ''
| 48 | processNext . . . . in org.apache.camel.processor.RouteInflightRepositoryProcessor
| 90 | process in org.apache.camel.processor.DelegateAsyncProcessor
| 73 | process . . . . . . in org.apache.camel.util.AsyncProcessorHelper
| 99 | processNext in org.apache.camel.processor.DelegateAsyncProcessor
| 90 | process . . . . . . in ''
| 73 | process in org.apache.camel.management.InstrumentationProcessor
| 99 | process . . . . . . in org.apache.camel.util.AsyncProcessorHelper
| 86 | process in org.apache.camel.processor.DelegateAsyncProcessor
| 105 | onMessage . . . . . in org.apache.camel.component.jms.EndpointMessageListener
| 1110 | runWorker in java.util.concurrent.ThreadPoolExecutor
| 603 | run . . `enter code here`. . . . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^ 722 | run in java.lang.Thread
感谢您的帮助
马库斯
答案 0 :(得分：0)
您的代码似乎更适合基于内容的路由器，使用选择EIP。
您是否可以使用选择声明？ http://camel.apache.org/content-based-router.html