官方示例：
启动camunda
官方资源
bpm文件
<?xml version="1.0" encoding="UTF-8"?>
<bpmn:definitions xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:camunda="http://camunda.org/schema/1.0/bpmn" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" id="Definitions_0aui0ws" targetNamespace="http://bpmn.io/schema/bpmn" exporter="Camunda Modeler" exporterVersion="4.10.0">
<bpmn:process id="payment-retrieval" name="Payment Retrieval" isExecutable="true">
<bpmn:startEvent id="StartEvent_1" name="Payment Retrieval Requested">
<bpmn:outgoing>SequenceFlow_0fn07fk</bpmn:outgoing>
</bpmn:startEvent>
<bpmn:serviceTask id="Task_19pt1nu" name="Charge Credit Card" camunda:type="external" camunda:topic="charge-card">
<bpmn:incoming>SequenceFlow_187qbq7</bpmn:incoming>
<bpmn:incoming>SequenceFlow_0ilu8bp</bpmn:incoming>
<bpmn:outgoing>SequenceFlow_1axd8hr</bpmn:outgoing>
</bpmn:serviceTask>
<bpmn:endEvent id="EndEvent_1oyw02k" name="Payment Received">
<bpmn:incoming>SequenceFlow_1axd8hr</bpmn:incoming>
</bpmn:endEvent>
<bpmn:sequenceFlow id="SequenceFlow_1axd8hr" sourceRef="Task_19pt1nu" targetRef="EndEvent_1oyw02k" />
<bpmn:sequenceFlow id="SequenceFlow_0fn07fk" sourceRef="StartEvent_1" targetRef="ExclusiveGateway_0r349mg" />
<bpmn:sequenceFlow id="SequenceFlow_0foxe2y" sourceRef="Task_1j42goo" targetRef="ExclusiveGateway_17ik05z" />
<bpmn:userTask id="Task_1j42goo" name="Approve Payment" camunda:assignee="superAdmin">
<bpmn:extensionElements>
<camunda:formData>
<camunda:formField id="amount" label="Amount" type="long" />
<camunda:formField id="item" label="Item" type="string" />
<camunda:formField id="approved" label="Approved?" type="boolean" />
</camunda:formData>
</bpmn:extensionElements>
<bpmn:incoming>SequenceFlow_0di0jwo</bpmn:incoming>
<bpmn:outgoing>SequenceFlow_0foxe2y</bpmn:outgoing>
</bpmn:userTask>
<bpmn:exclusiveGateway id="ExclusiveGateway_0r349mg" name="Payment Amount?">
<bpmn:incoming>SequenceFlow_0fn07fk</bpmn:incoming>
<bpmn:outgoing>SequenceFlow_0ilu8bp</bpmn:outgoing>
<bpmn:outgoing>SequenceFlow_0di0jwo</bpmn:outgoing>
</bpmn:exclusiveGateway>
<bpmn:sequenceFlow id="SequenceFlow_0ilu8bp" name="< 1000 €" sourceRef="ExclusiveGateway_0r349mg" targetRef="Task_19pt1nu">
<bpmn:conditionExpression xsi:type="bpmn:tFormalExpression">${amount<1000}</bpmn:conditionExpression>
</bpmn:sequenceFlow>
<bpmn:exclusiveGateway id="ExclusiveGateway_17ik05z" name="Approved?">
<bpmn:incoming>SequenceFlow_0foxe2y</bpmn:incoming>
<bpmn:outgoing>SequenceFlow_187qbq7</bpmn:outgoing>
<bpmn:outgoing>SequenceFlow_0ypgah8</bpmn:outgoing>
</bpmn:exclusiveGateway>
<bpmn:sequenceFlow id="SequenceFlow_187qbq7" name="Yes" sourceRef="ExclusiveGateway_17ik05z" targetRef="Task_19pt1nu">
<bpmn:conditionExpression xsi:type="bpmn:tFormalExpression">${approved}</bpmn:conditionExpression>
</bpmn:sequenceFlow>
<bpmn:sequenceFlow id="SequenceFlow_0di0jwo" name=">= 1000 €" sourceRef="ExclusiveGateway_0r349mg" targetRef="Task_1j42goo">
<bpmn:conditionExpression xsi:type="bpmn:tFormalExpression">${amount>=1000}</bpmn:conditionExpression>
</bpmn:sequenceFlow>
<bpmn:endEvent id="EndEvent_0fj2aui" name="Payment Retrieval Rejected">
<bpmn:incoming>SequenceFlow_0ypgah8</bpmn:incoming>
</bpmn:endEvent>
<bpmn:sequenceFlow id="SequenceFlow_0ypgah8" name="No" sourceRef="ExclusiveGateway_17ik05z" targetRef="EndEvent_0fj2aui">
<bpmn:conditionExpression xsi:type="bpmn:tFormalExpression">${!approved}</bpmn:conditionExpression>
</bpmn:sequenceFlow>
</bpmn:process>
<bpmndi:BPMNDiagram id="BPMNDiagram_1">
<bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="payment-retrieval">
<bpmndi:BPMNEdge id="SequenceFlow_0ypgah8_di" bpmnElement="SequenceFlow_0ypgah8">
<di:waypoint x="631" y="264" />
<di:waypoint x="713" y="264" />
<bpmndi:BPMNLabel>
<dc:Bounds x="665" y="243" width="15" height="12" />
</bpmndi:BPMNLabel>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge id="SequenceFlow_0di0jwo_di" bpmnElement="SequenceFlow_0di0jwo">
<di:waypoint x="272" y="145" />
<di:waypoint x="272" y="264" />
<di:waypoint x="374" y="264" />
<bpmndi:BPMNLabel>
<dc:Bounds x="284" y="176" width="50" height="12" />
</bpmndi:BPMNLabel>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge id="SequenceFlow_187qbq7_di" bpmnElement="SequenceFlow_187qbq7">
<di:waypoint x="606" y="239" />
<di:waypoint x="606" y="160" />
<bpmndi:BPMNLabel>
<dc:Bounds x="612" y="193" width="18" height="12" />
</bpmndi:BPMNLabel>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge id="SequenceFlow_0ilu8bp_di" bpmnElement="SequenceFlow_0ilu8bp">
<di:waypoint x="297" y="120" />
<di:waypoint x="556" y="120" />
<bpmndi:BPMNLabel>
<dc:Bounds x="404" y="98" width="44" height="12" />
</bpmndi:BPMNLabel>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge id="SequenceFlow_0foxe2y_di" bpmnElement="SequenceFlow_0foxe2y">
<di:waypoint x="474" y="264" />
<di:waypoint x="581" y="264" />
<bpmndi:BPMNLabel>
<dc:Bounds x="527.5" y="242.5" width="0" height="13" />
</bpmndi:BPMNLabel>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge id="SequenceFlow_0fn07fk_di" bpmnElement="SequenceFlow_0fn07fk">
<di:waypoint x="209" y="120" />
<di:waypoint x="247" y="120" />
<bpmndi:BPMNLabel>
<dc:Bounds x="183" y="98.5" width="90" height="13" />
</bpmndi:BPMNLabel>
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge id="SequenceFlow_1axd8hr_di" bpmnElement="SequenceFlow_1axd8hr">
<di:waypoint x="656" y="120" />
<di:waypoint x="713" y="120" />
<bpmndi:BPMNLabel>
<dc:Bounds x="639.5" y="98.5" width="90" height="13" />
</bpmndi:BPMNLabel>
</bpmndi:BPMNEdge>
<bpmndi:BPMNShape id="_BPMNShape_StartEvent_2" bpmnElement="StartEvent_1">
<dc:Bounds x="173" y="102" width="36" height="36" />
<bpmndi:BPMNLabel>
<dc:Bounds x="164" y="138" width="54" height="38" />
</bpmndi:BPMNLabel>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape id="ServiceTask_17yjgnl_di" bpmnElement="Task_19pt1nu">
<dc:Bounds x="556" y="80" width="100" height="80" />
</bpmndi:BPMNShape>
<bpmndi:BPMNShape id="EndEvent_1oyw02k_di" bpmnElement="EndEvent_1oyw02k">
<dc:Bounds x="713" y="102" width="36" height="36" />
<bpmndi:BPMNLabel>
<dc:Bounds x="708" y="141" width="46" height="25" />
</bpmndi:BPMNLabel>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape id="UserTask_1r7ozpl_di" bpmnElement="Task_1j42goo">
<dc:Bounds x="374" y="224" width="100" height="80" />
</bpmndi:BPMNShape>
<bpmndi:BPMNShape id="ExclusiveGateway_0r349mg_di" bpmnElement="ExclusiveGateway_0r349mg" isMarkerVisible="true">
<dc:Bounds x="247" y="95" width="50" height="50" />
<bpmndi:BPMNLabel>
<dc:Bounds x="249" y="62" width="45" height="25" />
</bpmndi:BPMNLabel>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape id="ExclusiveGateway_17ik05z_di" bpmnElement="ExclusiveGateway_17ik05z" isMarkerVisible="true">
<dc:Bounds x="581" y="239" width="50" height="50" />
<bpmndi:BPMNLabel>
<dc:Bounds x="579" y="292" width="54" height="13" />
</bpmndi:BPMNLabel>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape id="EndEvent_0fj2aui_di" bpmnElement="EndEvent_0fj2aui">
<dc:Bounds x="713" y="246" width="36" height="36" />
<bpmndi:BPMNLabel>
<dc:Bounds x="686" y="285" width="90" height="25" />
</bpmndi:BPMNLabel>
</bpmndi:BPMNShape>
</bpmndi:BPMNPlane>
</bpmndi:BPMNDiagram>
</bpmn:definitions>
新建外部Java程序
pom文件
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.camunda.bpm.getstarted</groupId>
<artifactId>charge-card-worker</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<camunda.external-task-client.version>7.15.0</camunda.external-task-client.version>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.camunda.bpm</groupId>
<artifactId>camunda-external-task-client</artifactId>
<version>${camunda.external-task-client.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>1.6.1</version>
</dependency>
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.3.1</version>
</dependency>
</dependencies>
<profiles>
<profile>
<id>jdk9-plus</id>
<activation><jdk>(1.8,)</jdk></activation>
<dependencies>
<dependency>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-impl</artifactId>
<version>2.3.1</version>
</dependency>
</dependencies>
</profile>
</profiles>
</project>
Java代码（修改：添加账户和密码）
package org.camunda.bpm.getstarted.chargecard;
import java.awt.Desktop;
import java.net.URI;
import java.util.logging.Logger;
import org.camunda.bpm.client.ExternalTaskClient;
import org.camunda.bpm.client.backoff.ExponentialBackoffStrategy;
import org.camunda.bpm.client.interceptor.auth.BasicAuthProvider;
public class ChargeCardWorker {
private final static Logger LOGGER = Logger.getLogger(ChargeCardWorker.class.getName());
public static void main(String[] args) {
ExternalTaskClient client = ExternalTaskClient.create()
.baseUrl("http://localhost:82/engine-rest")
// long polling timeout
.asyncResponseTimeout(10000)
// Only change made after turning on basic auth
.addInterceptor(new BasicAuthProvider("superAdmin","123456"))
.backoffStrategy(new ExponentialBackoffStrategy(0, 0, 0))
.build();
// subscribe to an external task topic as specified in the process
client.subscribe("charge-card")
// the default lock duration is 20 seconds, but you can override this
.lockDuration(1000)
.handler((externalTask, externalTaskService) -> {
// Put your business logic here
// Get a process variable
String item = (String) externalTask.getVariable("item");
Long amount = (Long) externalTask.getVariable("amount");
LOGGER.info("Charging credit card with an amount of '" + amount + "'€ for the item '" + item + "'...");
try {
Desktop.getDesktop().browse(new URI("https://docs.camunda.org/get-started/quick-start/complete"));
} catch (Exception e) {
e.printStackTrace();
}
// Complete the task
externalTaskService.complete(externalTask);
})
.open();
}
}访问camunda web页面，启动任务