（一）springboot2.7.6集成activit5.23.0之集成引擎

集成引擎很简单。

首先是创建springboot项目然后引入相关依赖就完成了。pom.xml如下：

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>xpl.study.activiti</groupId>
  <artifactId>study-activiti</artifactId>
  <version>1.0</version>
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.7.6</version>
  </parent>
  
  <properties>
  	<activiti.version>5.23.0</activiti.version>
  </properties>
  
  <dependencies>
	<dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-web</artifactId>
	</dependency>
	<dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-test</artifactId>
		<scope>test</scope>
	</dependency>
    <dependency>
		<groupId>org.activiti</groupId>
		<artifactId>activiti-spring-boot-starter-basic</artifactId>
		<version>${activiti.version}</version>
	</dependency>        
	<dependency>
		<groupId>com.h2database</groupId>
		<artifactId>h2</artifactId>
	</dependency>
  </dependencies>

  <build>
	<plugins>
		<plugin>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-maven-plugin</artifactId>
		</plugin>
	</plugins>
  </build>
</project>

然后，对应的StudyActivitiApplication.java

package xpl.study.activiti;

import org.activiti.engine.RepositoryService;
import org.activiti.engine.RuntimeService;
import org.activiti.engine.TaskService;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;

@SpringBootApplication(exclude = { org.activiti.spring.boot.SecurityAutoConfiguration.class,
		org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration.class })
public class StudyActivitiApplication {

	public static void main(String[] args) {
		SpringApplication.run(StudyActivitiApplication.class, args);
	}
	@Bean
	public CommandLineRunner init(final RepositoryService repositoryService, final RuntimeService runtimeService,
			final TaskService taskService) {
		return new CommandLineRunner() {
			@Override
			public void run(String... strings) throws Exception {
				System.out.println(
						"Number of process definitions : " + repositoryService.createProcessDefinitionQuery().count());
				System.out.println("Number of tasks : " + taskService.createTaskQuery().count());
//				runtimeService.startProcessInstanceByKey("oneTaskProcess");
//				System.out.println("Number of tasks after process start: " + taskService.createTaskQuery().count());
			}
		};
	}
}

最后，运行结果：

注意：

1.解决SecurityAutoConfiguration和SecurityAutoConfiguration安全检查。
解决方案是移除security安全校验方法为修改Application启动类。具体就是如下注解：

@SpringBootApplication(exclude = { org.activiti.spring.boot.SecurityAutoConfiguration.class,
		org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration.class })


  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.7.6)

2024-08-02 20:55:53.650  INFO 22744 --- [           main] x.s.activiti.StudyActivitiApplication    : Starting StudyActivitiApplication using Java 1.8.0_201 on XPL with PID 22744 (F:\workspace\maven\study-activiti\target\classes started by Administrator in F:\workspace\maven\study-activiti)
2024-08-02 20:55:53.653  INFO 22744 --- [           main] x.s.activiti.StudyActivitiApplication    : No active profile set, falling back to 1 default profile: "default"
2024-08-02 20:55:54.057 ERROR 22744 --- [           main] o.s.boot.SpringApplication               : Application run failed

java.lang.IllegalArgumentException: Could not find class [org.springframework.boot.autoconfigure.security.SecurityAutoConfiguration]
	at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:334) ~[spring-core-5.3.24.jar:5.3.24]
	at org.springframework.core.annotation.TypeMappedAnnotation.adapt(TypeMappedAnnotation.java:474) ~[spring-core-5.3.24.jar:5.3.24]
	at org.springframework.core.annotation.TypeMappedAnnotation.getValue(TypeMappedAnnotation.java:397) ~[spring-core-5.3.24.jar:5.3.24]
	at org.springframework.core.annotation.TypeMappedAnnotation.asMap(TypeMappedAnnotation.java:283) ~[spring-core-5.3.24.jar:5.3.24]
	at org.springframework.core.annotation.AbstractMergedAnnotation.asAnnotationAttributes(AbstractMergedAnnotation.java:193) ~[spring-core-5.3.24.jar:5.3.24]
	at org.springframework.core.type.AnnotatedTypeMetadata.getAnnotationAttributes(AnnotatedTypeMetadata.java:106) ~[spring-core-5.3.24.jar:5.3.24]
	at org.springframework.core.type.AnnotatedTypeMetadata.getAnnotationAttributes(AnnotatedTypeMetadata.java:81) ~[spring-core-5.3.24.jar:5.3.24]
	at org.springframework.context.annotation.AnnotationConfigUtils.attributesFor(AnnotationConfigUtils.java:285) ~[spring-context-5.3.24.jar:5.3.24]
	at org.springframework.context.annotation.AnnotationBeanNameGenerator.determineBeanNameFromAnnotation(AnnotationBeanNameGenerator.java:103) ~[spring-context-5.3.24.jar:5.3.24]
	at org.springframework.context.annotation.AnnotationBeanNameGenerator.generateBeanName(AnnotationBeanNameGenerator.java:82) ~[spring-context-5.3.24.jar:5.3.24]
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.registerBeanDefinitionForImportedConfigurationClass(ConfigurationClassBeanDefinitionReader.java:169) ~[spring-context-5.3.24.jar:5.3.24]
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForConfigurationClass(ConfigurationClassBeanDefinitionReader.java:150) ~[spring-context-5.3.24.jar:5.3.24]
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitions(ConfigurationClassBeanDefinitionReader.java:129) ~[spring-context-5.3.24.jar:5.3.24]
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:343) ~[spring-context-5.3.24.jar:5.3.24]
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:247) ~[spring-context-5.3.24.jar:5.3.24]
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:311) ~[spring-context-5.3.24.jar:5.3.24]
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:112) ~[spring-context-5.3.24.jar:5.3.24]
	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:746) ~[spring-context-5.3.24.jar:5.3.24]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:564) ~[spring-context-5.3.24.jar:5.3.24]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:147) ~[spring-boot-2.7.6.jar:2.7.6]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:731) [spring-boot-2.7.6.jar:2.7.6]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:408) [spring-boot-2.7.6.jar:2.7.6]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-2.7.6.jar:2.7.6]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1303) [spring-boot-2.7.6.jar:2.7.6]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1292) [spring-boot-2.7.6.jar:2.7.6]
	at xpl.study.activiti.StudyActivitiApplication.main(StudyActivitiApplication.java:15) [classes/:na]
Caused by: java.lang.ClassNotFoundException: org.springframework.boot.autoconfigure.security.SecurityAutoConfiguration
	at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[na:1.8.0_201]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_201]
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) ~[na:1.8.0_201]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_201]
	at java.lang.Class.forName0(Native Method) ~[na:1.8.0_201]
	at java.lang.Class.forName(Class.java:348) ~[na:1.8.0_201]
	at org.springframework.util.ClassUtils.forName(ClassUtils.java:284) ~[spring-core-5.3.24.jar:5.3.24]
	at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:324) ~[spring-core-5.3.24.jar:5.3.24]
	... 25 common frames omitted

2.为了方便测试，简化配置文件，引入h2数据库驱动的依赖。

3.init方法只是为了测试，不是集成activiti引擎必要的代码。

至此，springboot与activiti的集成就完成了。非常简单，只要2个文件：pom.xml和StudyActivitiApplication.java就可以编译运行了。