解决Springboot2.1.x配置Activiti7单独数据源问题

1|1简介

最近基于最新的Activiti7配置了SpringBoot2。

简单上手使用了一番。发现市面上解决Activiti7的教程很少，采坑也比较多，在Activiti6配置数据源和Activiti7有所区别，基于Activiti6在Activiti7里是无法正常使用的。接下来让我们看下区别。

1|2问题

Activiti6多数据源配置

6的配置比较简单点。

先加入配置：

# activiti 数据源
spring.datasource.activiti.driver=com.mysql.jdbc.Driver
spring.datasource.activiti.url=jdbc:mysql://10.1.1.97:3311/test-activiti7-db?useUnicode=true&characterEncoding=utf8&useSSL=false&allowMultiQueries=true
spring.datasource.activiti.username=root
spring.datasource.activiti.password=Rtqw123OpnmER
spring.datasource.activiti.driverClassName=com.mysql.jdbc.Driver

用@ConfigurationProperties加载以spring.datasource.activiti开头的DataSource。
创建ActivitiConfig继承AbstractProcessEngineAutoConfiguration方法注入SpringProcessEngineConfigurationbean,调用AbstractProcessEngineAutoConfiguration#baseSpringProcessEngineConfiguration方法把创建的数据源注入。

@Configuration
public class ActivitiConfig extends AbstractProcessEngineAutoConfiguration {

 @Bean
 @ConfigurationProperties(prefix = "spring.datasource.activiti")
 public DataSource activitiDataSource() {
  return DataSourceBuilder.create().build();
 }

 @Bean
 public SpringProcessEngineConfiguration springProcessEngineConfiguration(
   PlatformTransactionManager transactionManager,SpringAsyncExecutor springAsyncExecutor) throws IOException {

  return baseSpringProcessEngineConfiguration(
    activitiDataSource(),transactionManager,springAsyncExecutor);
 }
}

Activiti6的数据源已经配置完成，如果是7的话会发现

AbstractProcessEngineAutoConfiguration#baseSpringProcessEngineConfiguration方法已经不存在了，我们需要产考源码构建方式改造一番。

1|3修复

Activiti7多数据源配置

配置还是要上面的。

创建ActivitiConfig继承AbstractProcessEngineAutoConfiguration方法注入SpringProcessEngineConfigurationbean。
用@ConfigurationProperties加载以spring.datasource.activiti开头的DataSource

@Configuration
public class ActivitiConfig extends AbstractProcessEngineAutoConfiguration {

 @Bean
 @ConfigurationProperties(prefix = "spring.datasource.activiti")
 public DataSource activitiDataSource() {
  return DataSourceBuilder.create().build();
 }

 ...略
}
SpringProcessEngineConfiguration注入方式改为下面：
 @Bean
 @Primary
 public SpringProcessEngineConfiguration springProcessEngineConfiguration(
   PlatformTransactionManager transactionManager,SpringAsyncExecutor springAsyncExecutor,ActivitiProperties activitiProperties,ProcessDefinitionResourceFinder processDefinitionResourceFinder,@Autowired(required = false) DefaultActivityBehaviorFactoryMappingConfigurer processEngineConfigurationConfigurer,@Autowired(required = false) List<ProcessEngineConfigurator> processEngineConfigurators,UserGroupManager userGroupManager,DataSource dataSource) throws IOException {

  SpringProcessEngineConfiguration conf = new SpringProcessEngineConfiguration();
  conf.setConfigurators(processEngineConfigurators);
  configureProcessDefinitionResources(processDefinitionResourceFinder,conf);
  conf.setDataSource(dataSource);
  conf.setTransactionManager(transactionManager);

  if (springAsyncExecutor != null) {
   conf.setAsyncExecutor(springAsyncExecutor);
  }
  conf.setDeploymentName(activitiProperties.getDeploymentName());
  conf.setDatabaseSchema(activitiProperties.getDatabaseSchema());
  conf.setDatabaseSchemaUpdate(activitiProperties.getDatabaseSchemaUpdate());
  conf.setDbHistoryUsed(activitiProperties.isDbHistoryUsed());
  conf.setAsyncExecutorActivate(activitiProperties.isAsyncExecutorActivate());
  if (!activitiProperties.isAsyncExecutorActivate()) {
   ValidatorSet springBootStarterValidatorSet = new ValidatorSet("activiti-spring-boot-starter");
   springBootStarterValidatorSet.addValidator(new AsyncPropertyValidator());
   if (conf.getProcessValidator() == null) {
    ProcessValidatorImpl processValidator = new ProcessValidatorImpl();
    processValidator.addValidatorSet(springBootStarterValidatorSet);
    conf.setProcessValidator(processValidator);
   } else {
    conf.getProcessValidator().getValidatorSets().add(springBootStarterValidatorSet);
   }
  }
  conf.setMailServerHost(activitiProperties.getMailServerHost());
  conf.setMailServerPort(activitiProperties.getMailServerPort());
  conf.setMailServerUsername(activitiProperties.getMailServerUserName());
  conf.setMailServerPassword(activitiProperties.getMailServerPassword());
  conf.setMailServerDefaultFrom(activitiProperties.getMailServerDefaultFrom());
  conf.setMailServerUseSSL(activitiProperties.isMailServerUseSsl());
  conf.setMailServerUseTLS(activitiProperties.isMailServerUseTls());

  if (userGroupManager != null) {
   conf.setUserGroupManager(userGroupManager);
  }

  conf.setHistoryLevel(activitiProperties.getHistoryLevel());
  conf.setCopyVariablesToLocalForTasks(activitiProperties.isCopyVariablesToLocalForTasks());
  conf.setSerializePOJOsInVariablesToJson(activitiProperties.isSerializePOJOsInVariablesToJson());
  conf.setJavaClassFieldForJackson(activitiProperties.getJavaClassFieldForJackson());

  if (activitiProperties.getCustomMybatisMappers() != null) {
   conf.setCustomMybatisMappers(
     getCustomMybatisMapperClasses(activitiProperties.getCustomMybatisMappers()));
  }

  if (activitiProperties.getCustomMybatisXMLMappers() != null) {
   conf.setCustomMybatisXMLMappers(
     new HashSet<>(activitiProperties.getCustomMybatisXMLMappers()));
  }

  if (activitiProperties.getCustomMybatisXMLMappers() != null) {
   conf.setCustomMybatisXMLMappers(
     new HashSet<>(activitiProperties.getCustomMybatisXMLMappers()));
  }

  if (activitiProperties.isUseStrongUuids()) {
   conf.setIdGenerator(new StrongUuidGenerator());
  }

  if (activitiProperties.getDeploymentMode() != null) {
   conf.setDeploymentMode(activitiProperties.getDeploymentMode());
  }

  conf.setActivityBehaviorFactory(new DefaultActivityBehaviorFactory());

  if (processEngineConfigurationConfigurer != null) {
   processEngineConfigurationConfigurer.configure(conf);
  }

  return conf;
 }

 private void configureProcessDefinitionResources(
   ProcessDefinitionResourceFinder processDefinitionResourceFinder,SpringProcessEngineConfiguration conf) throws IOException {
  List<Resource> procDefResources = processDefinitionResourceFinder
    .discoverProcessDefinitionResources();
  if (!procDefResources.isEmpty()) {
   conf.setDeploymentResources(procDefResources.toArray(new Resource[0]));
  }
 }

1|4常见错误

在以上配置中可能会有jdbcUrl is required with driverClassName错误

解决办法如下:

# activiti 数据源
spring.datasource.activiti.driver=com.mysql.jdbc.Driver
spring.datasource.activiti.url=jdbc:mysql://10.1.1.97:3311/test-activiti7-db?useUnicode=true&characterEncoding=utf8&useSSL=false&allowMultiQueries=true
# url换为jdbc-url 解决jdbcUrl is required with driverClassName错误
# 官方文档的解释是：
# 因为连接池的实际类型没有被公开，所以在您的自定义数据源的元数据中没有生成密钥，而且在IDE中没有完成(因为DataSource接口没有暴露属性)。
# 另外，如果您碰巧在类路径上有Hikari，那么这个基本设置就不起作用了，因为Hikari没有url属性(但是确实有一个jdbcUrl属性)。在这种情况下，您必须重写您的配置如下:
spring.datasource.activiti.jdbc-url=${spring.datasource.activiti.url}
spring.datasource.activiti.username=root
spring.datasource.activiti.password=Rtqw123OpnmER
spring.datasource.activiti.driverClassName=com.mysql.jdbc.Driver

1|5总结

Activiti7国内的教程不是很多，需要自己在社区里或者官方文档，源码去看了解，细心学习。

示例代码地址:activiti-starter

总结

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解决Springboot2.1.x配置Activiti7单独数据源问题

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