Get Variable Instance

Retrieves a historic variable by id.

Method

GET /history/variable-instance/{id}

Parameters

Path Parameters

Name	Description
id	The id of the variable instance.

Query Parameters

Name	Description
deserializeValue	Determines whether serializable variable values (typically variables that store custom Java objects) should be deserialized on server side (default `true`). If set to `true`, a serializable variable will be deserialized on server side and transformed to JSON using Jackson's POJO/bean property introspection feature. Note that this requires the Java classes of the variable value to be on the REST API's classpath. If set to `false`, a serializable variable will be returned in its serialized format. For example, a variable that is serialized as XML will be returned as a JSON string containing XML. Note: While `true` is the default value for reasons of backward compatibility, we recommend setting this parameter to `false` when developing web applications that are independent of the Java process applications deployed to the engine.

Result

A user object with the following properties:

Name	Value	Description
id	String	The id of the variable instance.
name	String	The name of the variable instance.
type	String	The value type of the variable.
value	String/Number/Boolean/Object	The variable's value. Value differs depending on the variable's type and on the `deserializeValue` parameter.
valueInfo	Object	A JSON object containing additional, value-type-dependent properties. For variables of type `Object`, the following properties are returned: `objectTypeName`: A string representation of the object's type name. `serializationDataFormat`: The serialization format used to store the variable.
processDefinitionKey	String	The key of the process definition the variable instance belongs to.
processDefinitionId	String	The id of the process definition the variable instance belongs to.
processInstanceId	String	The id the process instance belongs to.
executionId	String	The execution id the variable instance belongs to.
activityInstanceId	String	The id of the activity instance in which the variable is valid.
caseDefinitionKey	String	The key of the case definition the variable instance belongs to.
caseDefinitionId	String	The id of the case definition the variable instance belongs to.
caseInstanceId	String	The case instance id the variable instance belongs to.
caseExecutionId	String	The case execution id the variable instance belongs to.
taskId	String	The id of the task the variable instance belongs to.
tenantId	String	The id of the tenant that this variable instance belongs to.
errorMessage	String	An error message in case a Java Serialized Object could not be de-serialized.
state	String	The current state of the variable. Can be 'CREATED' or 'DELETED'.
createTime	String	The time the variable was inserted. Default format* `yyyy-MM-dd'T'HH:mm:ss.SSSZ`.
removalTime	String	The time after which the variable should be removed by the History Cleanup job. Default format* `yyyy-MM-dd'T'HH:mm:ss.SSSZ`.
rootProcessInstanceId	String	The process instance id of the root process instance that initiated the process containing this variable.

* For further information, please see the documentation.

Response Codes

Code	Media type	Description
200	application/json	Request successful.
404	application/json	Variable with given id does not exist. See the Introduction for the error response format.

Example

Request

GET /history/variable-instance/someId

Response

Status 200.

{
  "id": "someId",
  "name": "amount",
  "type": "Integer",
  "value": 5,
  "valueInfo": {},
  "processDefinitionKey": "aProcessDefinitionKey",
  "processDefinitionId": "aProcessDefinitionId",
  "processInstanceId": "aProcessInstanceId",
  "executionId": "aExecutionId",
  "activityInstanceId": "Task_1:b68b71ca-e310-11e2-beb0-f0def1557726",
  "caseDefinitionKey": null,
  "caseDefinitionId": null,
  "caseInstanceId": null,
  "caseExecutionId": null,
  "taskId": null,
  "tenantId": null,
  "errorMessage": null,
  "state": "CREATED",
  "createTime":"2017-02-10T14:33:19.000+0200",
  "removalTime": "2018-02-10T14:33:19.000+0200",
  "rootProcessInstanceId": "aRootProcessInstanceId"
}

Options