Difficulty to configure Activiti into a Springboot application api - spring-boot

Question

First of all is it a viable thing to embed Activiti into an API type application for use within that application or should Activiti be run standalone?
The error below is due to bean definition but I'm not sure where the beans should be defined and how - if thats correct approach for version 6. Our standards with Springhboot 2 is to annotate beans in java rather than xml context
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-04-10 21:17:43.924 ERROR 19516 --- [ restartedMain] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
Field runtimeService in ma.cvmeeting.workflow.WorkflowApplication$MyrestController required a bean of type 'org.activiti.engine.RuntimeService' that could not be found.
The injection point has the following annotations:
- #org.springframework.beans.factory.annotation.Autowired(required=true)
Action:
Consider defining a bean of type 'org.activiti.engine.RuntimeService' in your configuration.
Process finished with exit code 0
code:
import org.activiti.engine.RuntimeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
#SpringBootApplication
public class WorkflowApplication {
public static void main(String[] args) {
SpringApplication.run(WorkflowApplication.class, args);
}
#RestController
public static class MyrestController{
#Autowired
private RuntimeService runtimeService;
#GetMapping("/start-process")
public String startProcess() {
runtimeService.startProcessInstanceByKey("Potulerauneoffre");
return "Process started. Number of currently running"
+ "process instances = "
+ runtimeService.createProcessInstanceQuery().count();
}
}
pom.xml:
<project>
<groupId>ma.cvmeeting</groupId>
<artifactId>workflow</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>workflow</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.activiti</groupId>
<artifactId>activiti-engine</artifactId>
<version>7-201802-EA</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.thymeleaf</groupId>
<artifactId>thymeleaf</artifactId>
<version>3.0.11.RELEASE</version>
</dependency>
<dependency>
<groupId>org.h2database</groupId>
<artifactId>h2database</artifactId>
<version>1.0.20061217</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

Answer 1

There are two ways to initialize the engine when you embed it in your spring based application:
1.) let spring initialize it for you so you can use all the engine services right away without need of any configuration. this requires activiti-spring-boot-starter as dependency.
2.) You initialize engine by your self and provide the services beans from #Configuration class. for this you will require only activiti-engine core as dependency
The reason your application cannot find the RuntimeService because you are trying the second approach add the below dependency in your pom.xml and remove the engine one
<dependency>
<groupId>org.activiti</groupId>
<artifactId>activiti-spring-boot-starter</artifactId>
</dependency>
you should follow documentation for more help.

Answer 2

We recommend activiti 7 core if you are planning to use spring boot 2.x and the use of the new APIs. This is great time if you want to get involved with the new APIs and project initiatives

Answer 3

You could write a #Configuration class and define Activiti services, like this :
#Configuration
public class ActivityConfig {
#Autowired
DataSource dataSource;
#Bean
public DataSourceTransactionManager getTransactionManager() {
return new DataSourceTransactionManager(dataSource);
}
#Bean
public ProcessEngineConfigurationImpl getProcessEngineConfiguration() {
SpringProcessEngineConfiguration res = new SpringProcessEngineConfiguration();
res.setDataSource(dataSource);
res.setTransactionManager(getTransactionManager());
return res;
}
#Bean
public ProcessEngineFactoryBean getProcessEngine() {
ProcessEngineFactoryBean res = new ProcessEngineFactoryBean();
res.setProcessEngineConfiguration(getProcessEngineConfiguration());
return res;
}
#Bean
public RepositoryService getRepositoryService() throws Exception {
return getProcessEngine().getObject().getRepositoryService();
}
#Bean
public FormService getFormService() throws Exception {
return getProcessEngine().getObject().getFormService();
}
#Bean
public TaskService getTaskService() throws Exception {
return getProcessEngine().getObject().getTaskService();
}
#Bean
public RuntimeService getRuntimeService() throws Exception {
return getProcessEngine().getObject().getRuntimeService();
}
#Bean
public HistoryService getHistoryService() throws Exception {
return getProcessEngine().getObject().getHistoryService();
}
#Bean
public IdentityService getIdentityService() throws Exception {
return getProcessEngine().getObject().getIdentityService();
}
}