| Package | Description | 
|---|---|
| org.activiti.engine | 
 Public API of the Activiti 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 Deployments RuntimeService:  For starting and searching ProcessInstances TaskService:  Exposes operations to manage human (standalone) Tasks, 
    such as claiming, completing and assigning tasksIdentityService:  Used for managing Users, 
    Groups and the relations between themManagementService:  Exposes engine admin and maintenance operations,
    which have no relation to the runtime exection of business processesHistoryService:  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.activiti.engine.history | 
 Classes related to the  
HistoryService. | 
| Modifier and Type | Method and Description | 
|---|---|
ProcessInstanceHistoryLogQuery | 
HistoryService.createProcessInstanceHistoryLogQuery(String processInstanceId)
Allows to retrieve the  
ProcessInstanceHistoryLog for one process instance. | 
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