How to modify a deployed process in activiti?

To modify a deployed process, the use of the API provided by Activiti is possible.

Here is an example code demonstrating how to modify a deployed process.

// 获取RepositoryService
RepositoryService repositoryService = processEngine.getRepositoryService();

// 查询已部署的流程定义
ProcessDefinition processDefinition = repositoryService.createProcessDefinitionQuery()
    .processDefinitionKey("processKey")
    .latestVersion()
    .singleResult();

// 获取流程定义的资源名称
String resourceName = processDefinition.getResourceName();

// 读取流程定义的资源文件
InputStream inputStream = repositoryService.getResourceAsStream(processDefinition.getDeploymentId(), resourceName);

// 将资源文件转换为BpmnModel对象
BpmnModel bpmnModel = new BpmnXMLConverter().convertToBpmnModel(new InputStreamSource(inputStream), false, false, "UTF-8");

// 对BpmnModel进行修改
// ...

// 将修改后的BpmnModel转换为字节数组
byte[] bpmnBytes = new BpmnXMLConverter().convertToXML(bpmnModel);

// 部署修改后的流程定义
Deployment deployment = repositoryService.createDeployment()
    .addBytes(resourceName, bpmnBytes)
    .deploy();

In order to modify a process definition, the RepositoryService needs to be obtained first. Then, the createProcessDefinitionQuery() method can be used to query the deployed process definitions, with conditions such as the key or name of the process definition. Next, the process definition ID and resource name from the query results can be used to retrieve the resource file of the process definition through the getResourceAsStream() method. After converting the resource file to a BpmnModel object, modifications can be made. Once the modifications are complete, the convertToXML() method can be used to convert the BpmnModel to a byte array. A new deployment object can then be created using the createDeployment() method, and the modified byte array can be added to the deployment object using the addBytes() method. Finally, the deploy() method can be used to deploy the modified process definition.

It is important to note that making changes to deployed processes may impact processes instances that are already in progress, so before modifying a process definition, the potential effects on existing process instances should be considered and properly managed.