Error : Field job in com.example.partioner.DemoApplication required a bean of type 'org.springframework.batch.core.Job' that could not be found - spring-batch

Question

I try a spring batch partitioning database program but I have this message when I try to run the batch:
APPLICATION FAILED TO START
Description: Field job in com.example.partioner.DemoApplication required a bean of type
'org.springframework.batch.core.Job' 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.springframework.batch.core.Job' in your configuration.
This is my main class :
package com.example.partioner;
import java.util.Date;
import org.springframework.batch.core.Job;
import org.springframework.batch.core.JobExecution;
import org.springframework.batch.core.JobParameters;
import org.springframework.batch.core.JobParametersBuilder;
import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;
import org.springframework.batch.core.launch.JobLauncher;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
#EnableBatchProcessing
public class DemoApplication implements CommandLineRunner {
#Autowired
private JobLauncher jobLauncher;
#Autowired
private Job job;
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
#Override
public void run(String... args) throws Exception {
System.out.println("STATUS STARTED===================");
JobParameters jobParameters = new JobParametersBuilder()
.addString("JobId", String.valueOf(System.currentTimeMillis()))
.addDate("date", new Date())
.addLong("time",System.currentTimeMillis()).toJobParameters();
JobExecution execution = jobLauncher.run(job, jobParameters);
System.out.println("STATUS :: "+execution.getStatus());
}
}
This my jobConfig class :
package com.example.config;
import java.util.HashMap;
import java.util.Map;
import javax.sql.DataSource;
import org.springframework.batch.core.Job;
import org.springframework.batch.core.Step;
import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;
import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;
import org.springframework.batch.core.configuration.annotation.StepScope;
import org.springframework.batch.item.database.BeanPropertyItemSqlParameterSourceProvider;
import org.springframework.batch.item.database.JdbcBatchItemWriter;
import org.springframework.batch.item.database.JdbcPagingItemReader;
import org.springframework.batch.item.database.Order;
import org.springframework.batch.item.database.support.MySqlPagingQueryProvider;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.task.SimpleAsyncTaskExecutor;
import com.example.mapper.CustomerRowMapper;
import com.example.model.Customer;
import com.example.partitioner.ColumnRangePartitioner;
#Configuration
public class JobConfiguration {
#Autowired
private JobBuilderFactory jobBuilderFactory;
#Autowired
private StepBuilderFactory stepBuilderFactory;
#Autowired
private DataSource dataSource;
#Bean
public ColumnRangePartitioner partitioner()
{
ColumnRangePartitioner columnRangePartitioner = new ColumnRangePartitioner();
columnRangePartitioner.setColumn("id");
columnRangePartitioner.setDataSource(dataSource);
columnRangePartitioner.setTable("customer");
return columnRangePartitioner;
}
#Bean
#StepScope
public JdbcPagingItemReader<Customer> pagingItemReader(
#Value("#{stepExecutionContext['minValue']}") Long minValue,
#Value("#{stepExecutionContext['maxValue']}") Long maxValue)
{
System.out.println("reading " + minValue + " to " + maxValue);
Map<String, Order> sortKeys = new HashMap<>();
sortKeys.put("id", Order.ASCENDING);
MySqlPagingQueryProvider queryProvider = new MySqlPagingQueryProvider();
queryProvider.setSelectClause("id, firstName, lastName, birthdate");
queryProvider.setFromClause("from customer");
queryProvider.setWhereClause("where id >= " + minValue + " and id < " + maxValue);
queryProvider.setSortKeys(sortKeys);
JdbcPagingItemReader<Customer> reader = new JdbcPagingItemReader<>();
reader.setDataSource(this.dataSource);
reader.setFetchSize(10);
reader.setRowMapper(new CustomerRowMapper());
reader.setQueryProvider(queryProvider);
return reader;
}
#Bean
#StepScope
public JdbcBatchItemWriter<Customer> customerItemWriter()
{
JdbcBatchItemWriter<Customer> itemWriter = new JdbcBatchItemWriter<>();
itemWriter.setDataSource(dataSource);
itemWriter.setSql("INSERT INTO NEW_CUSTOMER VALUES (:id, :firstName, :lastName, :birthdate)");
itemWriter.setItemSqlParameterSourceProvider
(new BeanPropertyItemSqlParameterSourceProvider<>());
itemWriter.afterPropertiesSet();
return itemWriter;
}
#Bean
public Step slaveStep()
{
return stepBuilderFactory.get("slaveStep")
.<Customer, Customer>chunk(10)
.reader(pagingItemReader(null, null))
.writer(customerItemWriter())
.build();
}
#Bean
public Step step1()
{
return stepBuilderFactory.get("step1")
.partitioner(slaveStep().getName(), partitioner())
.step(slaveStep())
.gridSize(4)
.taskExecutor(new SimpleAsyncTaskExecutor())
.build();
}
#Bean
public Job job()
{
return jobBuilderFactory.get("job")
.start(step1())
.build();
}
}
This is my partitioner class:
package com.example.partitioner;
import java.util.HashMap;
import java.util.Map;
import javax.sql.DataSource;
import org.springframework.batch.core.partition.support.Partitioner;
import org.springframework.batch.item.ExecutionContext;
import org.springframework.jdbc.core.JdbcOperations;
import org.springframework.jdbc.core.JdbcTemplate;
public class ColumnRangePartitioner implements Partitioner
{
private JdbcOperations jdbcTemplate;
private String table;
private String column;
public void setTable(String table) {
this.table = table;
}
public void setColumn(String column) {
this.column = column;
}
public void setDataSource(DataSource dataSource) {
jdbcTemplate = new JdbcTemplate(dataSource);
}
#Override
public Map<String, ExecutionContext> partition(int gridSize)
{
int min = jdbcTemplate.queryForObject("SELECT MIN(" + column + ") FROM " + table, Integer.class);
int max = jdbcTemplate.queryForObject("SELECT MAX(" + column + ") FROM " + table, Integer.class);
int targetSize = (max - min) / gridSize + 1;
Map<String, ExecutionContext> result = new HashMap<>();
int number = 0;
int start = min;
int end = start + targetSize - 1;
while (start <= max)
{
ExecutionContext value = new ExecutionContext();
result.put("partition" + number, value);
if(end >= max) {
end = max;
}
value.putInt("minValue", start);
value.putInt("maxValue", end);
start += targetSize;
end += targetSize;
number++;
}
return result;
}
}
I don't understand the reason of this message and can't find a solution. I think I have put all the necessary annotations. I am a beginner and I hope you will help me.

Answer 1

You DemoApplication is in package com.example.partioner while your job configuration class JobConfiguration is in package com.example.config.
In order for Spring Boot to find your job, you need to move your JobConfiguration class to the same package as your main class DemoApplication or a package underneath it.
Please refer to the Structuring Your Code section of the reference documentation.