Java Mule ESB XPath函数返回ArrayList而不是字符串
我有一个Mule ESB测试项目：Java Mule ESB XPath函数返回ArrayList而不是字符串,java,xml,xpath,mule,Java,Xml,Xpath,Mule,我有一个Mule ESB测试项目： <?xml version="1.0" encoding="UTF-8"?> <mule xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation" xmlns:spring="http://www.springframework.org/schema/beans" version
<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation" xmlns:spring="http://www.springframework.org/schema/beans" version="CE-3.4.0" 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-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd">
<flow name="testFlow1" doc:name="testFlow1">
<poll frequency="60000" doc:name="Poll">
<flow-ref name="testFlow2" doc:name="Flow Reference"/>
</poll>
<processor ref="" />
</flow>
<sub-flow name="testFlow2" doc:name="testFlow2">
<set-payload value="<root>
<entry>
<key>mobile_phone</key>
<value>380996547889</value>
</entry>
</root>" doc:name="Set Payload"/>
<logger message="XML: #[message.payload]" level="INFO" doc:name="Log XML"/>
<logger message="MobilePhone: #[xpath('/root/entry/key[text()="mobile_phone"]/../value/text()')]" level="INFO" doc:name="Log Properties"/>
</sub-flow>
</mule>
**********************************************************************
* Application: test *
* OS encoding: UTF-8, Mule encoding: UTF-8 *
* *
* Agents Running: *
* JMX Agent *
**********************************************************************
INFO 2013-11-18 14:39:39,190 [main] org.mule.module.launcher.MuleDeploymentService:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ Started app 'test' +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
INFO 2013-11-18 14:39:40,270 [[test].connector.polling.mule.default.receiver.01] org.mule.api.processor.LoggerMessageProcessor: XML: <root> <entry> <key>mobile_phone</key> <value>380996547889</value> </entry> </root>
ERROR 2013-11-18 14:39:40,545 [[test].connector.polling.mule.default.receiver.01] org.mule.exception.DefaultMessagingExceptionStrategy:
********************************************************************************
Message : Execution of the expression "xpath('/root/entry/key[text()="mobile_phone"]/../value/text()').getText()" failed. (org.mule.api.expression.ExpressionRuntimeException). Message payload is of type: String
Code : MULE_ERROR--2
--------------------------------------------------------------------------------
Exception stack is:
1. [Error: unable to resolve method: java.util.ArrayList.getText() [arglength=0]]
[Near : {... xpath('/root/entry/key[text()= ....}]
^
[Line: 1, Column: 1] (org.mvel2.PropertyAccessException)
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer:1078 (null)
2. Execution of the expression "xpath('/root/entry/key[text()="mobile_phone"]/../value/text()').getText()" failed. (org.mule.api.expression.ExpressionRuntimeException)
org.mule.el.mvel.MVELExpressionLanguage:218 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/expression/ExpressionRuntimeException.html)
3. Execution of the expression "xpath('/root/entry/key[text()="mobile_phone"]/../value/text()').getText()" failed. (org.mule.api.expression.ExpressionRuntimeException). Message payload is of type: String (org.mule.api.MessagingException)
org.mule.execution.ExceptionToMessagingExceptionExecutionInterceptor:35 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/MessagingException.html)
--------------------------------------------------------------------------------
Root Exception stack trace:
[Error: unable to resolve method: java.util.ArrayList.getText() [arglength=0]]
[Near : {... xpath('/root/entry/key[text()= ....}]
^
[Line: 1, Column: 1]
at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:1078)
at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:987)
at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:377)
+ 3 more (set debug level logging or '-Dmule.verbose.exceptions=true' for everything)
********************************************************************************
**********************************************************************
*应用：测试*
*OS编码：UTF-8，Mule编码：UTF-8*
* *
*正在运行的代理：*
*JMX代理*
**********************************************************************
信息2013-11-18 14:39:39190[main]org.mule.module.launcher.MuleDeploymentService:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+已启动应用程序“测试”+
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
INFO 2013-11-18 14:39:40270[[test].connector.polling.mule.default.receiver.01]org.mule.api.processor.LoggerMessageProcessor:XML:mobile_phone 380996547889
错误2013-11-18 14:39:40545[[test].connector.polling.mule.default.receiver.01]org.mule.exception.defaultMessaginExceptionStrategy:
********************************************************************************
消息：执行表达式“xpath（'/root/entry/key[text（）=“mobile_phone”]/../value/text（）”）。getText（）失败。（org.mule.api.expression.ExpressionRuntimeException）。消息负载的类型为：String
代码：MULE_错误--2
--------------------------------------------------------------------------------
异常堆栈是：
1.[错误：无法解析方法：java.util.ArrayList.getText（）[arglength=0]]
[近：{…xpath（'/root/entry/key[text（）=…}]
^
[行：1，列：1]（org.mvel2.PropertyAccessException）
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer:1078（null）
2.表达式“xpath（'/root/entry/key[text（）=“mobile_phone”]/../value/text（）”）.getText（）的执行失败。（org.mule.api.expression.ExpressionRuntimeException）
org.mule.el.mvel.mvelexpression语言：218(http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/expression/ExpressionRuntimeException.html)
3.表达式“xpath（'/root/entry/key[text（）=“mobile_phone”]/../value/text（）”）.getText（）的执行失败。（org.mule.api.expression.ExpressionRuntimeException）。消息负载的类型为：String（org.mule.api.MessaginException）
org.mule.execution.ExceptionToMessaginExceptionExecutionInterceptor:35(http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/MessagingException.html)
--------------------------------------------------------------------------------
根异常堆栈跟踪：
[错误：无法解析方法：java.util.ArrayList.getText（）[arglength=0]]
[近：{…xpath（'/root/entry/key[text（）=…}]
^
[行：1，列：1]
位于org.mvel2.optimizers.impl.refl.reflectAccessorOptimizer.getMethod（reflectAccessorOptimizer.java:1078）
位于org.mvel2.optimizers.impl.refl.reflectAccessorOptimizer.getMethod（reflectAccessorOptimizer.java:987）
位于org.mvel2.optimizers.impl.refl.reflectAccessorOptimizer.compilegeChain（reflectAccessorOptimizer.java:377）
+3个以上（为所有内容设置调试级别日志或“-Dmule.verbose.exceptions=true”）
********************************************************************************
值有人知道如何强制XPath返回always String对象吗？通过在XML中添加
XPath（'/root/entry/key[text（）=“mobile\u phone”]/../value/text（）'）[org.dom4j.tree。DefaultText@17c1e333[文本：“380”]，org.dom4j.tree。DefaultText@3a2b3574[文本：“996547889”]