machine learning

 https://spacy.io/usage/spacy-101

https://scikit-learn.org/stable/install.html

Redis template

 https://www.tabnine.com/code/java/methods/org.springframework.data.redis.core.RedisTemplate/opsForSet

Exception handling ways in springboot

 https://springframework.guru/exception-handling-in-spring-boot-rest-api/

Junit tutorial

 https://www.vogella.com/tutorials/JUnit/article.html

Completable feature

 https://www.callicoder.com/java-8-completablefuture-tutorial/

spring batch example

 steps for create spring batch application

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-batch</artifactId>
</dependency>

public class MyFirstJob implements Tasklet {
    @Override
    public RepeatStatus execute(StepContribution stepContribution, ChunkContext chunkContext) throws Exception {
        System.out.println("MyTaskOne start..");
       List<Integer> mylist= Arrays.asList(1,2,3,4,5,6,6,67,7,7,7,7);
        for(Integer number :mylist){
            System.out.println("-------------"+number);
        }

        // ... your code

        System.out.println("MyTaskOne done..");
        return RepeatStatus.FINISHED;
    }
}

public class MySecondJob implements Tasklet {
    @Override
    public RepeatStatus execute(StepContribution stepContribution, ChunkContext chunkContext) throws Exception {
        List<String>mylist= Arrays.asList("pawan","ravi","mynme");
        for(String name: mylist){
            System.out.println("name---"+name);
        }
        return RepeatStatus.FINISHED;
    }
}

@Configuration
@EnableBatchProcessing
public class BatchConfig {
    @Autowired
    private JobBuilderFactory jobs;

    @Autowired
    private StepBuilderFactory steps;

    @Bean
    public Step stepOne() {
        return steps.get("stepOne")
                .tasklet(new MyFirstJob())
                .build();
    }

    @Bean
    public Step stepTwo() {
        return steps.get("stepTwo")
                .tasklet(new MySecondJob())
                .build();
    }

    @Bean
    public Job demoJob() {
        return jobs.get("demoJob").incrementer(new RunIdIncrementer())
                .start(stepOne())
                .next(stepTwo())
                .build();
    }

}

@Configuration
public class AvoidMetadataConfiguration extends DefaultBatchConfigurer {
    @Override
    protected JobRepository createJobRepository() throws Exception {
        MapJobRepositoryFactoryBean factoryBean = new MapJobRepositoryFactoryBean();
        factoryBean.afterPropertiesSet();
        return factoryBean.getObject();
    }
}

@Component
public class SpringJobSchedular {
    @Autowired
    JobLauncher jobLauncher;

    @Autowired
    Job job;

    @Scheduled(cron = "* 0/1 * * * ?")
    public void perform() throws Exception
    {
        System.out.println("------------------myjob in ----------------------");
        JobParameters params = new JobParametersBuilder()
                .addString("JobID", String.valueOf(System.currentTimeMillis()))
                .toJobParameters();

        jobLauncher.run(job, params);
        System.out.println("------------------myjob in ----------------------");
    }
}

Creating docker image from fresh

1. Create docker file

 Dockerfile

FROM openjdk

COPY ./target/myservice-0.0.1-SNAPSHOT.jar /usr/app/

WORKDIR /usr/app

RUN sh -c 'touch myservice-0.0.1-SNAPSHOT.jar'

EXPOSE 8089

ENV spring.profiles.active="local"

 2.Create image from docker file

 sudo docker build -t mylocalapp:1.0 .

mylocalapp is image name 

1.0 is tag 

 3.Create container from image 

sudo docker run -d -p 9090:80 --name pawancontainer mylocalapp:1.0

 

pawancontainer is container name

mylocalapp:1.0 is image name and 1.0 is tag name

4.sudo docker ps -a

list of all container