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## org.mule.api.expression
Class RequiredValueException

    java.lang.Object
      java.lang.Throwable
          java.lang.Exception
              java.lang.RuntimeException
                  org.mule.api.MuleRuntimeException
                      org.mule.api.expression.ExpressionRuntimeException
                          org.mule.api.expression.RequiredValueException

All Implemented Interfaces:
  Serializable

    public class RequiredValueException

extends ExpressionRuntimeException

Is thrown explicitly when an expression is executed that returns a null value when a value is required. Typically, this exception will only be thrown by Mule-specific evaluators such as Header or Attachment.

See Also:
  Serialized Form

Constructor Summary
`RequiredValueException(Message message)`
`RequiredValueException(Message message, Throwable cause)`

Method Summary

Methods inherited from class java.lang.Throwable
`fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

### RequiredValueException

    public RequiredValueException(Message message)

### RequiredValueException

    public RequiredValueException(Message message,
                                  Throwable cause)

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