The Spring Boot - Activiti integration

Requirement -

To create api's exposing Activiti Process Engine which can be consumed in any web interface applications.

Pre-requisites

• JDK 7+
• activiti-spring-boot-starter-basic Version - 5.18.0
• spring-boot-starter-web - to expose REST Interface Version - 1.4.0.RELEASE
• spring-context - Not Documented officially however, required in some case to avoid build errors. Version - 4.3.2.RELEASE
• junit - For unit testing. Version - 3.8.1
• activiti-engine - for obivious resons - Version 5.18.0
• activiti-spring - Version - 5.18.0
• mysql-connector-java - for making jdbc connection to mysql server, H2 or postgres can be used as alternate. Version - 5.1.34
• tomcat-jdbc - Version - 8.0.15

Main Application Class - For Starting and running the application -

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.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import javax.sql.DataSource;

@Configuration
@ComponentScan
@EnableAutoConfiguration
public class MyApplication {

	public static void main(String[] args) {
		SpringApplication.run(MyApplication.class, args);
	}

	@Bean
    public CommandLineRunner init(final RepositoryService repositoryService,
				  final RuntimeService runtimeService,
				  final TaskService taskService) {

	return new CommandLineRunner() {
	    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());
	    }
	};

    }	
}

Data Base configuration - Part of main application class

@Bean
public DataSource database(){
	// TODO change the connection url & details for different DB
	return DataSourceBuilder.create().url("jdbc:mysql://localhost:3306/activiti-spring-boot?characterEncoding=UTF-8")
			.username("Jeetendra")
			.password("abcd1234")
			.driverClassName("com.mysql.jdbc.Driver")
			.build();
}