The ExceptionList tree is created with the logical tree when an input message is parsed.
The tree is initially empty, and is only populated if an exception occurs during message flow processing. It is possible that more than one exception can occur; if more than one exception occurs, the ExceptionList tree contains a subtree for each exception.
You can access the ExceptionList tree in JavaCompute nodes from the MbMessageAssembly parameter of your evaluate() method.
You can access the ExceptionList tree in a node in an error handling procedure. For example, you might want to route the message to a different path based on the type of exception.
//ParserException
returns
all elements in the tree named ParserException. //ParserException[Number=5016]
returns
only the exception that contains Number=5016. string(//ParserException[Number=5016]/Text)
The following Java™ code extracts this text from your code:
String text =
(String)inAssembly.getExceptionList().evaluateXPath("string(//ParserException[Number=5016]/Text)");
For information on accessing the ExceptionList tree using ESQL, see Accessing the ExceptionList tree using ESQL