## Summary

The ExpressionHandler is used to execute dynamic commands writtin in MVEL or SpEL expression language. Action objects must include attributes to configure the handler otherwise an exception will be thrown. Possible attribute values are listed below.

### ExpressionHandler Service Attributes

Attribute | Description
--- | ---
type | The expression language type of the command to be executed. Possible values are MVEL and SpEl (MVEL will be applied by default if type is not provided).
command | The expression language command that should be executed