# Uses of Package
org.flowable.engine.delegate

Packages that use org.flowable.engine.delegate
Package
Description
org.flowable.engine
Public API of the Flowable engine.
Typical usage of the API starts by the creation of a `ProcessEngineConfiguration` (typically based on a configuration file), from which a `ProcessEngine` can be obtained.
Through the services obtained from such a `ProcessEngine`, BPM and workflow operation can be executed:
`RepositoryService`: Manages `Deployment`s.
`RuntimeService`: For starting and searching `ProcessInstance`s.
`TaskService`: Exposes operations to manage human (standalone) tasks, such as claiming, completing and assigning tasks.
`IdentityService`: Used for managing users, groups and the relations between them.
`ManagementService`: Exposes engine administration and maintenance operations, which have no relation to the runtime exection of business processes.
`HistoryService`: Exposes information about ongoing and past process instances.
`FormService`: Access to form data and rendered forms for starting new process instances and completing tasks.
org.flowable.engine.compatibility
org.flowable.engine.debug
org.flowable.engine.delegate
Interfaces used to include Java code in a process as the behavior of an activity or as a listener to process events with `JavaDelegate`s.
org.flowable.engine.delegate.event
org.flowable.engine.delegate.event.impl
org.flowable.engine.delegate.variable
org.flowable.engine.interceptor

- Classes in org.flowable.engine.delegate used by org.flowable.engine
  Class
  Description
  DelegateExecution
  Execution used in `JavaDelegate`s and `ExecutionListener`s.
- Classes in org.flowable.engine.delegate used by org.flowable.engine.compatibility
  Class
  Description
  BpmnError
  Special exception that can be used to throw a BPMN Error from `JavaDelegate`s and expressions.
  DelegateExecution
  Execution used in `JavaDelegate`s and `ExecutionListener`s.
- Classes in org.flowable.engine.delegate used by org.flowable.engine.debug
  Class
  Description
  DelegateExecution
  Execution used in `JavaDelegate`s and `ExecutionListener`s.
- Classes in org.flowable.engine.delegate used by org.flowable.engine.delegate
  Class
  Description
  BaseExecutionListener
  Callback interface to be notified of execution events like starting a process instance, ending an activity instance or taking a transition.
  DelegateExecution
  Execution used in `JavaDelegate`s and `ExecutionListener`s.
  FlowableFutureJavaDelegate
  Convenience class which always uses the `AsyncTaskInvoker` to execute the async data.
  FutureJavaDelegate
  Convenience class that should be used when a Java delegation in a BPMN 2.0 process is required (for example, to call custom business logic).
  ReadOnlyDelegateExecution
- Classes in org.flowable.engine.delegate used by org.flowable.engine.delegate.event
  Class
  Description
  DelegateExecution
  Execution used in `JavaDelegate`s and `ExecutionListener`s.
- Classes in org.flowable.engine.delegate used by org.flowable.engine.delegate.event.impl
  Class
  Description
  DelegateExecution
  Execution used in `JavaDelegate`s and `ExecutionListener`s.
- Classes in org.flowable.engine.delegate used by org.flowable.engine.delegate.variable
  Class
  Description
  DelegateExecution
  Execution used in `JavaDelegate`s and `ExecutionListener`s.
- Classes in org.flowable.engine.delegate used by org.flowable.engine.interceptor
  Class
  Description
  DelegateExecution
  Execution used in `JavaDelegate`s and `ExecutionListener`s.