Mule-在Groovy组件中从映射中删除给定密钥

我需要在groovy中从映射中删除一个键。我看过很多帖子，并尝试过这样做：

   def mymap = message.getInboundProperty("http.query.params");

   mymap.remove('thatKey');

上述代码不适用于我，并引发错误：

    Message               : Failed to invoke ScriptComponent{GlobalProductDataStoreIntegrationMainFlow.component.1929599908}. Component     that caused exception is: ScriptComponent{GlobalProductDataStoreIntegrationMainFlow.component.1929599908}. Message payload is of     type: NullPayload
Type                  : org.mule.component.ComponentException
Code                  : MULE_ERROR--2
Payload               : {NullPayload}
JavaDoc               : http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/component/ComponentException.html
********************************************************************************
Exception stack is:
1. null (java.lang.UnsupportedOperationException)
  java.util.Collections$UnmodifiableMap:1345 (null)
2. java.lang.UnsupportedOperationException (javax.script.ScriptException)
  org.codehaus.groovy.jsr223.GroovyScriptEngineImpl:348 (http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/script/ScriptException.html)
 3. Failed to invoke    ScriptComponent{GlobalProductDataStoreIntegrationMainFlow.component.1929599908}.      Component that caused     exception is:    ScriptComponent{GlobalProductDataStoreIntegrationMainFlow.component.1929599908}.        Message payload is of type: NullPayload (org.mule.component.ComponentException)
  org.mule.component.AbstractComponent:142 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/component/ComponentException.html)
********************************************************************************
Root Exception stack trace:
java.lang.UnsupportedOperationException
at java.util.Collections$UnmodifiableMap.remove(Collections.java:1345)
at org.mule.module.http.internal.ParameterMap.remove(ParameterMap.java:112)

---

因为映射是不可变的，所以您得到了UnsupportedOperationException；它不能被修改。解决方法是创建一个新的映射，其中不包括您不想要的条目：

def mymap = message.getInboundProperty("http.query.params").findAll { 
    it.key != 'thatkey' 
}

---

因为映射是不可变的，所以您得到了UnsupportedOperationException；它不能被修改。解决方法是创建一个新的映射，其中不包括您不想要的条目：

def mymap = message.getInboundProperty("http.query.params").findAll { 
    it.key != 'thatkey' 
}