Let's implement a non-blocking batch process by following these steps:

1. Create a Spring Boot 2.0 project, ch11-batch-async, that has the same starter POM dependencies with the same MySQL connection pool support and Spring OXM module.
2. Create a bootstrap class that enables batch processing and task scheduling:

@EnableBatchProcessing 
@SpringBootApplication 
@EnableScheduling 
public class AsyncBatchBootApplication { 
    
 public static void main(String[] args) throws Exception { 
     SpringApplication.run(AsyncBatchBootApplication.class, 
 args); 
 } 
} 

3. In its srcmain/ esources directory, create application.properties that contain the same configuration as the one in ch11-batch-sync. Just modify some server-related configurations.
4. Copy logback.xml from the previous project and drop it inside srcmain esources to enable logging.
5. Then, copy all the packages from the ch11-batch-sync project without any changes.
6. Next, start the asynchronous batch processing configuration and inject the TaskExecutor that will generate the thread pool into BatchConfig:

@Bean("mvcTaskexecutor") 
     public TaskExecutor getAsyncExecutor() { 
         ConcurrentTaskExecutor executor =  
new ConcurrentTaskExecutor( 
                  Executors.newFixedThreadPool(100)); 
         executor.setTaskDecorator(new TaskDecorator() { 
            @Override 
            public Runnable decorate (Runnable runnable) { 
                return () -> { 
                    long t = System.currentTimeMillis(); 
                    runnable.run(); 
                    System.out.printf("Thread %s has a  
processing time:  %s%n",  
                           Thread.currentThread().getName(),        
                        (System.currentTimeMillis() - t)); 
                }; 
            } 
        }); 
       return executor; 
}

7. Assign threads to taskletStep() and chunkStep() by passing the TaskExecutor bean to the taskExecutor() method of their respective StepBuildFactory instances.
8. Save all files. Deploy the application with clean spring-boot:run Maven command. Expect random and messy writes to the output.txt output file.