Question

我正在尝试以编程方式更新Camunda DMN表，并在更新后再次部署它。但是在创建流程引擎时，获得了H2驱动程序的例外，但是对于给定的项目，我使用的是PostgreSQL数据库中的Camunda表。

ProcessEngine processEngine = ProcessEngineConfiguration
                .createStandaloneInMemProcessEngineConfiguration().buildProcessEngine();


org.camunda.bpm.engine.repository.Deployment deployment = processEngine.getRepositoryService()
                    .createDeployment()
                    .addString(fileName, Dmn.convertToString(dmnModelInstance))
                    .name("Deployment after update").deploy();

java.sql.SQLException：在UnpooledDataSource上设置驱动程序时出错。原因：java.lang.ClassNotFoundException：org.h2.Driver 在org.apache.ibatis.datasource.unpooled.UnpooledDataSource.initializeDriver（UnpooledDataSource.java:221）在org.apache.ibatis.datasource.unpooled.UnpooledDataSource.doGetConnection（UnpooledDataSource.java:200）在org.apache.ibatis.datasource.unpooled.UnpooledDataSource.doGetConnection（UnpooledDataSource.java:196）在org.apache.ibatis.datasource.unpooled.UnpooledDataSource.getConnection（UnpooledDataSource.java:93）在org.apache.ibatis.datasource.pooled.PooledDataSource.popConnection（PooledDataSource.java:385）在org.apache.ibatis.datasource.pooled.PooledDataSource.getConnection（PooledDataSource.java:89）在org.camunda.bpm.engine.impl.cfg.ProcessEngineConfigurationImpl.initDatabaseType（ProcessEngineConfigurationImpl.java:1300）

Answer 1

您需要显式创建数据源bean，或者可以在bootstrap.yml或application.properties文件中声明数据源属性。

@Configuration
public class ExampleProcessEngineConfiguration {

  @Bean
  public DataSource dataSource() {
     // Use a JNDI data source or read the properties from
     // env or a properties file.
     // Note: The following shows only a simple data source
     // for In-Memory H2 database.

    SimpleDriverDataSource dataSource = new SimpleDriverDataSource();
    dataSource.setDriverClass(org.h2.Driver.class);
    dataSource.setUrl("jdbc:h2:mem:camunda;DB_CLOSE_DELAY=-1");
    dataSource.setUsername("sa");
    dataSource.setPassword("");
    return dataSource;
  }

  @Bean
  public PlatformTransactionManager transactionManager() {
    return new DataSourceTransactionManager(dataSource());
  }

  @Bean
  public SpringProcessEngineConfiguration processEngineConfiguration() {
    SpringProcessEngineConfiguration config = new SpringProcessEngineConfiguration();

    config.setDataSource(dataSource());
    config.setTransactionManager(transactionManager());

    config.setDatabaseSchemaUpdate("true");
    config.setHistory("audit");
    config.setJobExecutorActivate(true);

    return config;
  }

  @Bean
  public ProcessEngineFactoryBean processEngine() {
    ProcessEngineFactoryBean factoryBean = new ProcessEngineFactoryBean();
    factoryBean.setProcessEngineConfiguration(processEngineConfiguration());
    return factoryBean;
  }

  @Bean
  public RepositoryService repositoryService(ProcessEngine processEngine) {
    return processEngine.getRepositoryService();
  }

  @Bean
  public RuntimeService runtimeService(ProcessEngine processEngine) {
    return processEngine.getRuntimeService();
  }

  @Bean
  public TaskService taskService(ProcessEngine processEngine) {
    return processEngine.getTaskService();
  }

  // more engine services and additional beans ...

}

使用PostgreSQL创建ProcessEngine时发生异常

1 个答案: