FAQ Camunda - DigiBP/digibp.github.io GitHub Wiki

This is our FAQ (Frequently Asked Questions) page concerning the Camunda BPM stack and related topics.

• Expression
  • What is an expression?
• Other
  • How to generate a business key?
  • XYZ?

An expression in Camunda is based on the Unified Expression Language (EL) ¹

Process variables (sometimes form fields) of the current scope are available inside an expression such as conditional expression of a sequence flow following an (X)OR gateway.

¹ Expression Language • docs.camunda.org/manual/latest/user-guide/process-engine/expression-language

Keep in mind that business keys must be defined prior the instantiation of a process.

In a Camunda environment where dependency injection and/or spring beans are available such as in Camunda Spring Boot, ${strongUuidGenerator.getNextId()} can be used to generate a unique business key by placing this expression into the default value of a form field:

<camunda:formField defaultValue="${strongUuidGenerator.getNextId()}" id="businessKey" label="Business Key" type="string" />