내 응용 프로그램을 mule 3.4.2에서 3.5.2 버전으로 업그레이드 한 후 x12 파일을 처리하는 동안 아래 예외가 발생했습니다.RequiredValueException 문제 뮬 3.5.2
2014-12-18 06:41:41,062 [[unionstation-15.1-SNAPSHOT].httpsConnector.receiver.18] ERROR org.mule.exception.DefaultMessagingExceptionStrategy - ******************************************************************************** Message : Expression Evaluator "header" with expression "invocation:username" returned null but a value was required. (org.mule.api.expression.RequiredValueException). Message payload is of type: ContentLengthInputStream Code : MULE_ERROR-29999 -------------------------------------------------------------------------------- Exception stack is: 1. Expression Evaluator "header" with expression "invocation:username" returned null but a value was required. (org.mule.api.expression.RequiredValueException) org.mule.expression.ExpressionUtils:235 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/expression/RequiredValueException.html) 2. Expression Evaluator "header" with expression "invocation:username" returned null but a value was required. (org.mule.api.expression.RequiredValueException). Message payload is of type: ContentLengthInputStream (org.mule.api.MessagingException) org.mule.execution.ExceptionToMessagingExceptionExecutionInterceptor:32 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/MessagingException.html) -------------------------------------------------------------------------------- Root Exception stack trace: org.mule.api.expression.RequiredValueException: Expression Evaluator "header" with expression "invocation:username" returned null but a value was required. at org.mule.expression.ExpressionUtils.getPropertyInternal(ExpressionUtils.java:235) at org.mule.expression.ExpressionUtils.getPropertyWithScope(ExpressionUtils.java:63) at org.mule.expression.ExpressionUtils.getPropertyWithScope(ExpressionUtils.java:46) + 3 more (set debug level logging or '-Dmule.verbose.exceptions=true' for everything) ********************************************************************************
어느 누구도 언젠가 똑같은 문제에 직면 해 있습니까?
또한,'header' 식 계산기가 오래되어 MEL에 찬성 사용되지 않습니다있다. 그래서 대신 # [flowVars [ 'username']]'를 사용하십시오. –