工作流Flowable和Spring集成时，有一个xml是用来配置ProcessEngine的信息，xml的内容如下所示：
<?xml version="1.0" encoding="UTF-8" standalone="no"?><beans xmlns="/schema/beans" xmlns:aop="/schema/aop"xmlns:context="/schema/context" xmlns:jdbc="/schema/jdbc"xmlns:jee="/schema/jee" xmlns:tx="/schema/tx" xmlns:jpa="/schema/data/jpa"xmlns:xsi="/2001/XMLSchema-instance"xsi:schemaLocation="/schema/aop /schema/aop/spring-aop.xsd/schema/beans /schema/beans/spring-beans.xsd /schema/context/schema/context/spring-context.xsd /schema/jee /schema/jee/spring-jee.xsd /schema/tx /schema/tx/spring-tx.xsd /schema/jdbc /schema/jdbc/spring-jdbc.xsd/schema/data/jpa /schema/data/jpa/spring-jpa.xsd"><!-- Activiti begin --><bean id="processEngineConfiguration" class="com.xxx.xxx.config.ExtProcessEngineConfiguration"><property name="dataSource" ref="dataSource" /><property name="transactionManager" ref="transactionManager" /><property name="databaseSchemaUpdate" value="true" /><!-- property name="jobExecutorActivate" value="false" /--><property name="customSessionFactories"><list><bean class="com.xxx.xxx.entity.EntityManagerFactory"><constructor-arg index="0" value="org.flowable.idm.engine.impl.persistence.entity.UserEntityManager" /><constructor-arg index="1"><bean class="com.xxx.xxx.entity.SmartUserEntityManager"/></constructor-arg></bean><bean class="com.xxx.xxx.entity.EntityManagerFactory"><constructor-arg index="0" value="org.flowable.idm.engine.impl.persistence.entity.GroupEntityManager" /><constructor-arg index="1"><bean class="com.xxx.xxx.entity.SmartGroupEntityManager"/></constructor-arg></bean><bean class="com.xxx.xxx.entity.EntityManagerFactory"><constructor-arg index="0" value="org.flowable.idm.engine.impl.persistence.entity.MembershipEntityManager" /><constructor-arg index="1"><bean class="com.xxx.xxx.entity.SmartMembershipEntityManager"/></constructor-arg></bean></list></property></bean><bean id="processEngine" factory-bean="processEngineConfiguration" factory-method="buildProcessEngine" /><bean id="repositoryService" factory-bean="processEngineConfiguration" factory-method="getRepositoryService" /><bean id="runtimeService" factory-bean="processEngineConfiguration" factory-method="getRuntimeService" /><bean id="taskService" factory-bean="processEngineConfiguration" factory-method="getTaskService" /><bean id="historyService" factory-bean="processEngineConfiguration" factory-method="getHistoryService" /><bean id="managementService" factory-bean="processEngineConfiguration" factory-method="getManagementService" /><bean id="formService" factory-bean="processEngineConfiguration" factory-method="getFormService" /><bean id="identityService" factory-bean="processEngineConfiguration" factory-method="getIdentityService" /><bean id="commandExecutor" factory-bean="processEngineConfiguration" factory-method="getCommandExecutor" /><bean id="processDefinitionCache" factory-bean="processEngineConfiguration" factory-method="getProcessDefinitionCache"/></beans>
使用Spring boot之后推崇java配置取代xml配置，要对这个xml进行改造首先得搞清楚这个xml里面的内容，主要是定义了ExtProcessEngineConfiguration和它相关的属性，
说明：
constructor-arg：通过构造函数注入。
property：通过setter对应的方法注入。
factory-method：通过工厂方法来构造java Bean
创建config配置文件WorkflowConfiguration，在这个类中通过@bean的注解构造ExtProcessEngineConfiguration 类，同时设置ExtProcessEngineConfiguration 需要的几个属性
@Configurationpublic class WorkflowConfiguration {private final DataSource dataSource;private final PlatformTransactionManager transactionManager;public WorkflowConfiguration(DataSource dataSource,PlatformTransactionManager transactionManager){this.dataSource = dataSource;this.transactionManager = transactionManager;}@Beanpublic SmartUserEntityManager smartUserEntityManager() {return new SmartUserEntityManager(new ExtProcessEngineConfiguration());}@Beanpublic SmartGroupEntityManager smartGroupEntityManager() {return new SmartGroupEntityManager(new ExtProcessEngineConfiguration());}@Beanpublic SmartMembershipEntityManager smartMembershipEntityManager() {return new SmartMembershipEntityManager(new ExtProcessEngineConfiguration());}public EntityManagerFactory userEntityManagerFactory(){EntityManagerFactory entityManagerFactory = new EntityManagerFactory(UserEntityManager.class, smartUserEntityManager());return entityManagerFactory;}public EntityManagerFactory groupEntityManagerFactory(){EntityManagerFactory entityManagerFactory = new EntityManagerFactory(GroupEntityManager.class, smartGroupEntityManager());return entityManagerFactory;}public EntityManagerFactory membershipEntityManagerFactory(){EntityManagerFactory entityManagerFactory = new EntityManagerFactory(MembershipEntityManager.class, smartMembershipEntityManager());return entityManagerFactory;}@Beanpublic ExtProcessEngineConfiguration engineConfiguration(){ExtProcessEngineConfiguration engineConfiguration = new ExtProcessEngineConfiguration();engineConfiguration.setDatabaseSchemaUpdate("true");engineConfiguration.setDataSource(dataSource);engineConfiguration.setTransactionManager(transactionManager);List<SessionFactory> customSessionFactories = new ArrayList<>();customSessionFactories.add(userEntityManagerFactory());customSessionFactories.add(groupEntityManagerFactory());customSessionFactories.add(membershipEntityManagerFactory());engineConfiguration.setCustomSessionFactories(customSessionFactories);return engineConfiguration;}}
其中核心的代码是：
@Beanpublic ExtProcessEngineConfiguration engineConfiguration()
这个方法。
其中有一个重点需要注意的地方是，在xml里面有一段：
<bean id="processEngine" factory-bean="processEngineConfiguration" factory-method="buildProcessEngine" />
这个是Spring使用实例工厂方法实例化Bean的一种方式，工作作流引擎Flowable的各个组件就是使用此方式实例化的。由于使用工厂实例化的Bean跟普通Bean不同，其返回的对象不是指定类的一个实例，其返回的是该FactoryBean的getObject方法所返回的对象。因此我们需要使用Spring Boot的方式来实例化Flowable的组件。有两种解决方法：
自定义FactoryBean，实现FactoryBean中的getObject这个方法，返回ProcessEngine对象使用ProcessEngineFactoryBean，推荐使用这种方式，以下为ProcessEngineFactoryBean源码。
public class ProcessEngineFactoryBean implements FactoryBean<ProcessEngine> ..{...protected ProcessEngineImpl processEngine;public ProcessEngine getObject() throws Exception {initializeExpressionManager();initializeTransactionExternallyManaged();if (processEngineConfiguration.getBeans()==null) {processEngineConfiguration.setBeans(new SpringBeanFactoryProxyMap(applicationContext));}processEngine = (ProcessEngineImpl) processEngineConfiguration.buildProcessEngine();return processEngine;}...}
ProcessEngineFactoryBean最终返回的是processEngine对象，repositoryService、runtimeService、formService等等组件都是通过processEngine里的getXX方法获得的。
通过WorkflowConfiguration就可以取代xml配置文件了。
在我们需要继承flowable-restApi的时候发现需要进行权限校验，我们可以通过下面的注解去掉security权限校验，在启动类上加上下面的注解：
@SpringBootApplication(exclude = {org.springframework.boot.autoconfigure.security.SecurityAutoConfiguration.class,org.flowable.spring.boot.SecurityAutoConfiguration.class})
