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

Name	Value	Description
value	String / Number / Boolean / Object	The variable's value. Value differs depending on the variable's type and on the `deserializeValue` parameter.
type	String	The value type of the variable.
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.

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.

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",
  "variableType": "integer",
  "value": 5,
  "valueInfo": {},
  "processDefinitionKey": "aProcessDefinitionKey",
  "processDefinitionId": "aProcessDefinitionId",
  "processInstanceId": "aProcessInstanceId",
  "executionId": "aExecutionId",
  "activityInstanceId": "Task_1:b68b71ca-e310-11e2-beb0-f0def1557726",
  "caseDefinitionKey": null,
  "caseInstanceId": null,
  "caseExecutionId": null,
  "taskId": null,
  "tenantId": null,
  "errorMessage": null
}

Options