如何使用java api生成jbpmn

import org.jbpm.process.core.Context;
import org.jbpm.process.core.Process;
import org.jbpm.process.core.ProcessBuilder;
import org.jbpm.process.core.impl.ProcessImpl;
import org.jbpm.workflow.core.WorkflowProcess;

import java.io.FileOutputStream;
import java.io.IOException;

public class JbpmnGenerator {
    public static void main(String[] args) {
        try {
            // 创建流程构建器
            ProcessBuilder processBuilder = new ProcessBuilder();

            // 定义流程节点
            Context context = new Context();
            context.setVariable("name", "Start Event");
            processBuilder.addContext(context);

            // 创建流程
            Process process = new ProcessImpl();
            ((WorkflowProcess) process).setProcessBuilder(processBuilder);

            // 生成JBPMN XML
            String jbpmnXml = process.toXML();

            // 将JBPMN XML写入文件
            try (FileOutputStream fos = new FileOutputStream("process.bpmn2")) {
                fos.write(jbpmnXml.getBytes());
            }

            System.out.println("JBPMN file generated successfully.");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}