我一直在和Mule一起做一个简单的项目。目标是从url中提取两个数字,并使用它们创建一个范围,然后检查它们是否是3、7或两者的倍数,然后依次打印出来。要遵循的流程代码:
<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns:scripting="http://www.mulesoft.org/schema/mule/scripting" xmlns:dw="http://www.mulesoft.org/schema/mule/ee/dw" xmlns:json="http://www.mulesoft.org/schema/mule/json" 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"
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
http://www.mulesoft.org/schema/mule/json http://www.mulesoft.org/schema/mule/json/current/mule-json.xsd
http://www.mulesoft.org/schema/mule/ee/dw http://www.mulesoft.org/schema/mule/ee/dw/current/dw.xsd
http://www.mulesoft.org/schema/mule/scripting http://www.mulesoft.org/schema/mule/scripting/current/mule-scripting.xsd">
<configuration doc:name="Configuration">
<expression-language>
<import class="sandbox.FindingMultiples" />
<global-functions>
def multiples(f,c)
{
return sandbox.FindingMultiples.multiplesInRange(f,c);
}
</global-functions>
</expression-language>
</configuration>
<flow name="multiples-implFlow">
<logger level="INFO" doc:name="Log Start of Flow" message="multiples-implFlow: Starting flow..."/>
<set-variable variableName="floor" value="#[message.inboundProperties.'http.uri.params'.floor]" doc:name="Set Floor Variable"/>
<set-variable variableName="ceiling" value="#[message.inboundProperties.'http.uri.params'.ceiling]" doc:name="Set Ceiling Variable"/>
<logger level="INFO" doc:name="Log Flow Variables" message="Floor: #[flowVars.floor] Ceiling: #[flowVars.ceiling]"/>
<logger message="Starting transformation..." level="INFO" doc:name="Log Start of Transform"/>
<dw:transform-message doc:name="Transform Message">
<dw:set-payload><![CDATA[%dw 1.0
%output application/java
---
{
output: multiples((flowVars.floor), (flowVars.ceiling))
}]]></dw:set-payload>
</dw:transform-message>
<logger message="Completing transformation. Payload: #[payload]" level="INFO" doc:name="Log Payload"/>
<json:object-to-json-transformer doc:name="Object to JSON"/>
<logger message="Post Object to Json. Payload: #[payload]" level="INFO" doc:name="Log Payload"/>
<logger level="INFO" doc:name="Log End of Flow" message="multiples-implFlow: Completing Flow..."/>
</flow>
</mule>
我使用自己编写的自定义Java类来处理逻辑:
package sandbox;
import java.util.*;
import java.util.stream.IntStream;
public class FindingMultiples {
public List<String> multiplesInRange(int floor, int ceiling)
{
int[] range = IntStream.rangeClosed(floor, ceiling).toArray();
List<String> result = new ArrayList<>();
for(int i = 0; i < range.length; i++)
{
if(range[i] % 3 == 0)
{
result.add(range[i] + " : " + "ME");
i++;
}else if(range[i] % 7 == 0)
{
result.add(range[i] + " : " + "MAY");
i++;
}else if(range[i] % 3 == 0 && range[i] % 7 == 0)
{
result.add(range[i] + " : " + "MAY and ME");
i++;
}else
{
i++;
}
}
return result;
}
}
软件包构建得很好,但当我尝试与邮递员通话时,出现以下错误:
Message : [Error: unable to resolve method: sandbox.FindingMultiples.multiplesInRange(java.lang.String, java.lang.String) [arglength=2]]
[Near : {... def multiples(f,c) ....}]
^
[Line: 1, Column: 1] (org.mule.mvel2.PropertyAccessException).
Payload : {NullPayload}
Payload Type : org.mule.transport.NullPayload
Element : /multiples-implFlow/processors/5 @ sandbox:multiples-impl.xml:28 (Transform Message)
Element XML : <dw:transform-message doc:name="Transform Message">
<dw:set-payload>%dw 1.0
%output application/java
---
{
output: multiples((flowVars.floor), (flowVars.ceiling))
}</dw:set-payload>
</dw:transform-message>
--------------------------------------------------------------------------------
Root Exception stack trace:
[Error: unable to resolve method: sandbox.FindingMultiples.multiplesInRange(java.lang.String, java.lang.String) [arglength=2]]
[Near : {... def multiples(f,c) ....}]
^
[Line: 1, Column: 1]
以及堆栈跟踪,我可以根据要求提供完整的堆栈跟踪。我不确定如何解决此错误。有什么帮助吗?
