public Mapping createFlowMapping(final String sourceExpression, final String targetExpression) {
        return createFlowMapping(sourceExpression, targetExpression, false, null);
    }
Create flow mapping.

@param sourceExpression the source expression
@param targetExpression the target expression
@return the mapping
core/cas-server-core-webflow-api/src/main/java/org/apereo/cas/web/flow/configurer/AbstractCasWebflowConfigurer.java