您使用以下参数调用了函数“值选择器”：在m子4中

Question

我在调试模式下运行代码，并意识到路径error.exception.cause.errorMessage.typedValue.value中出现以下错误消息。

{
   "error": "authentication failed: Could not bind with your username/pw: LDAP Result Code 49 \"Invalid Credentials\": 80090308: LdapErr: DSID-0C090442, comment: AcceptSecurityContext error, data 52e, v3839\u0000"
}

但是当我尝试获取值时

(read(error.exception.cause.errorMessage.typedValue.value,"application/json"))

在抛出低于错误的变量中。

ERROR 2020-05-28 08:43:56,779 [[MuleRuntime].io.01: [proc-brain-usage-sync-batch].send-usage-data-to-brain.BLOCKING @164a6d7b] [event: 2ec6d1e1-a049-11ea-9b85-00059a3c7a00] org.mule.extension.jsonlogger.JsonLoggerExtension: Failed parsing field: content
org.mule.runtime.core.api.expression.ExpressionRuntimeException: "You called the function 'Value Selector' with these arguments: 
  1: String ("{\"error\":\"authentication failed: Could not bind with your username/pw: LD...)
  2: Name ("value")

But it expects one of these combinations:
  (Array, Name)
  (Array, String)
  (Date, Name)
  (DateTime, Name)
  (LocalDateTime, Name)
  (LocalTime, Name)
  (Object, Name)
  (Object, String)
  (Period, Name)
  (Time, Name)

5|  brainerror: write(error.exception.cause.errorMessage.typedValue.value, "application/json") default "" 
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Trace:
  at write (line: 5, column: 20)
  at main (line: 5, column: 14)" evaluating expression: "output application/json ---
{
 usageMetadata: vars.usageMetadata,
 attributes: attributes,
 brainerror: write(error.exception.cause.errorMessage.typedValue.value, "application/json") default "" 
}".
Caused by: org.mule.runtime.api.el.ExpressionExecutionException: You called the function 'Value Selector' with these arguments: 
  1: String ("{\"error\":\"authentication failed: Could not bind with your username/pw: LD...)
  2: Name ("value")

But it expects one of these combinations:
  (Array, Name)
  (Array, String)
  (Date, Name)
  (DateTime, Name)
  (LocalDateTime, Name)
  (LocalTime, Name)
  (Object, Name)
  (Object, String)
  (Period, Name)
  (Time, Name)

5|  brainerror: write(error.exception.cause.errorMessage.typedValue.value, "application/json") default "" 
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

我如何捕获错误.description的方式捕获路径'error.exception.cause.errorMessage.typedValue.value'中的值？

Answer 1

您的error.exception.cause.errorMessage.typedValue.value是字符串，您尝试将其转换为JSON以进行写入。不要转换-照原样写（已经是字符串）。

换句话说-不要使用write-字符串已经是字符串。

或者，也许您需要相反的东西？要将String更改为JSON？这是更常见的需求，由读取功能完成。 https://simpleflatservice.com/mule4/ChangeStringToJsonOnTheFly.html