camunda-8-connector-sendBPMNmessage

A Camunda 8 Connector to send a BPMN Message

Principle

Send a BPMN Message

Inputs

Name	Description	Class	Default	Level
messageName	Name of message to send, used to find the receiver	java.lang.String		REQUIRED
messageId	Message Id	java.lang.String		OPTIONAL
correlationVariables	Correlation value (1)	java.lang.String		OPTIONAL
MessageVariables	Expression to get the variable expression (2)	java.lang.String		REQUIRED
messageDuration	Duration of message on server	java.lang.String		OPTIONAL

(1) CorrelationVariables If the receiver is a intermediate catch event message, a correlation is mandatory to find the process instance to unfreeze.

(2) MessageVariables:

Variables to copy in the message. The format is "(=)* An string can be done explicitly To give the value, a constant can be used

statusTransferExpense=Correct,dateTransferExpense=2024/12/05,amountTransfer=453

In general, values of variables are not a constant. So, to pass value, use a Feel Expression can be provided:

= "statusTransferExpense="+statusTransfer+",dateTransferExpense="+dateTransfer+", amountTransfer="+amount

where statusTransfer, dateTransfer and amount are process variables.

Attention, Feel expression accept only string: Variables statusTransfer, dateTransfer must be String processes variable.

If not, the complete expression returns null, without any information.

To avoid this and use any kind of variable, use a constant expression with placeholder ${<processVariable>}.

For example, in the expression:

statusTransferExpense=${statusTransfer}, dateTransferExpense=${dateTransfer}, amountTransfer=${amount}

statusTransfer will be replace by its value, a String, dateTransfer can be a Date, and amount a double.

See test/resources/SendMessage.bpmn"

Output

Name	Description	Class	Level
messageKey	Key generated by Zeebe	java.lang.Long	REQUIRED
tenantId	Tenant ID which capture the message	java.lang.String	REQUIRED

BPMN Errors

Name	Explanation
INCORRECT_VARIABLE_DEFINITION	Incorrect variable expression definition. The value must be a list of (name=variable,)+
SEND_MESSAGE	Error during the send operation

Build

mvn clean package

Two jars are produced. The jar with all dependencies can be upload in the Cherry Framework

Element Template

The element template can be found in the element-templates directory.

Example

This process send a message Pay employee without any correlation.

The second process send back a message Transfer done with a correlation key.