application context中部分bean的依赖关系在Spring批次中形成一个循环

Question

我正在开发一个简单的 Spring 批处理应用程序，当我完成配置后，我发现了这个问题：

The dependencies of some of the beans in the application context form a cycle:

jobRestController defined in file [/home/yassine/Downloads/demo/target/classes/com/example/demo/JobRestController.class] springBatchConfig defined in file [/home/yassine/Downloads/demo/target/classes/com/example/demo/SpringBatchConfig.class]

Action:

Relying upon circular references is discouraged and they are prohibited by default. Update your application to remove the dependency cycle between beans. As a last resort, it may be possible to break the cycle automatically by setting spring.main.allow-circular-references to true.

执行两个类:

Spring批量配置：

import lombok.AllArgsConstructor;
import org.springframework.batch.core.Job;
import org.springframework.batch.core.Step;
import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;
import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;
import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;
import org.springframework.batch.item.ItemProcessor;
import org.springframework.batch.item.ItemReader;
import org.springframework.batch.item.ItemWriter;
import org.springframework.batch.item.file.FlatFileItemReader;
import org.springframework.batch.item.file.LineMapper;
import org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper;
import org.springframework.batch.item.file.mapping.DefaultLineMapper;
import org.springframework.batch.item.file.transform.DelimitedLineTokenizer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.Resource;

@Configuration
@EnableBatchProcessing
@AllArgsConstructor
public class SpringBatchConfig {

    private JobBuilderFactory jobBuilderFactory;
    private StepBuilderFactory stepBuilderFactory;
    private ItemReader<BankTransaction> bankTransactionItemReader;
    private ItemProcessor<BankTransaction, BankTransaction> bankTransactionItemProcessor;
    private ItemWriter<BankTransaction> bankTransactionItemWriter;

    @Bean
    public Job bankJob() {
        Step step1 = stepBuilderFactory.get("step-load-data")
                .<BankTransaction, BankTransaction>chunk(100)
                .reader(bankTransactionItemReader)
                .processor(bankTransactionItemProcessor)
                .writer(bankTransactionItemWriter)
                .build();
        return jobBuilderFactory.get("bank-data-loader-job")
                .start(step1)
                .build();
    }

    @Bean
    public FlatFileItemReader<BankTransaction> flatFileItemReader(@Value("${inputFile}") Resource inputFile) {
        FlatFileItemReader<BankTransaction> flatFileItemReader = new FlatFileItemReader<>();
        flatFileItemReader.setName("CSV-READER");
        flatFileItemReader.setLinesToSkip(1);
        flatFileItemReader.setResource(inputFile);
        flatFileItemReader.setLineMapper(lineMapper());
        return flatFileItemReader;
    }

    @Bean
    public LineMapper<BankTransaction> lineMapper() {
        DefaultLineMapper<BankTransaction> lineMapper = new DefaultLineMapper<>();
        DelimitedLineTokenizer lineTokenizer = new DelimitedLineTokenizer();
        lineTokenizer.setDelimiter(",");
        lineTokenizer.setStrict(false);
        lineTokenizer.setNames("id", "accountID", "strTransactionDate", "transactionType", "amount");
        lineMapper.setLineTokenizer(lineTokenizer);
        BeanWrapperFieldSetMapper<BankTransaction> fieldSetMapper = new BeanWrapperFieldSetMapper<>();
        fieldSetMapper.setTargetType(BankTransaction.class);
        lineMapper.setFieldSetMapper(fieldSetMapper);
        return lineMapper;
    }
}

JobRestController:

import lombok.AllArgsConstructor;
import org.springframework.batch.core.*;
import org.springframework.batch.core.launch.JobLauncher;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.HashMap;
import java.util.Map;

@RestController
@AllArgsConstructor
public class JobRestController {

    private JobLauncher jobLauncher;
    private Job job;

    @GetMapping("/startJob")
    public BatchStatus load() throws Exception {
        Map<String, JobParameter> parameters = new HashMap<>();
        parameters.put("time", new JobParameter(System.currentTimeMillis()));
        JobParameters jobParameters = new JobParameters(parameters);
        JobExecution jobExecution = jobLauncher.run(job, jobParameters);
        while (jobExecution.isRunning()) {
            System.out.println(".....");
        }
        return jobExecution.getStatus();
    }
}

pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.6.1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>demo</description>
    <properties>
        <java.version>11</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-batch</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </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>
        <dependency>
            <groupId>org.springframework.batch</groupId>
            <artifactId>spring-batch-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

我无法修复它，而且我在 Whosebug 上也没有发现任何类似的问题。提前谢谢你

Answer 1

今天我遇到了同样的问题，我通过以下步骤解决了它：

您应该创建 ItemWriter、ItemProcessor Beans
在另一个配置中声明 Job bean class

spring batch config

package com.example.demo.config;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.List;


import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;
import org.springframework.batch.item.ItemProcessor;
import org.springframework.batch.item.ItemWriter;
import org.springframework.batch.item.file.FlatFileItemReader;
import org.springframework.batch.item.file.LineMapper;
import org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper;
import org.springframework.batch.item.file.mapping.DefaultLineMapper;
import org.springframework.batch.item.file.transform.DelimitedLineTokenizer;
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.io.Resource;

import com.example.demo.dao.Person;
import com.example.demo.dao.PersonRepository;

import lombok.RequiredArgsConstructor;

@Configuration
@EnableBatchProcessing
@RequiredArgsConstructor
public class SpringBatchConfig {
    
    @Bean
    public FlatFileItemReader<Person> getItemReader(@Value("${filePath}") Resource resource){
        FlatFileItemReader<Person> itemReader = new FlatFileItemReader<Person>();
        itemReader.setName("CSV-READER");
        itemReader.setLinesToSkip(1);
        itemReader.setResource(resource);
        itemReader.setLineMapper(PersonLineMapper());
        return itemReader;
    }
    
    @Bean
    public LineMapper<Person> PersonLineMapper(){
        DefaultLineMapper<Person> lineMapper = new DefaultLineMapper<Person>();
        DelimitedLineTokenizer lineTokenizer = new DelimitedLineTokenizer();
        lineTokenizer.setStrict(false);
        lineTokenizer.setDelimiter(";");
        lineTokenizer.setNames("id","fName","lName","strBirthDate","gender","dispo");
        lineMapper.setLineTokenizer(lineTokenizer);
        BeanWrapperFieldSetMapper<Person> fieldSetMapper = new BeanWrapperFieldSetMapper<Person>();
        fieldSetMapper.setTargetType(Person.class);
        lineMapper.setFieldSetMapper(fieldSetMapper);
        return lineMapper;
    }
    
    @Bean
    public ItemProcessor<Person, Person> getItemProcessor(){
        return new ItemProcessor<Person, Person>() {
            private DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
            @Override
            public Person process(Person item) throws Exception {
                item.setBirthDate(dateFormat.parse(item.getStrBirthDate()));
                return item;
            }
        };
    }
    
    @Bean
    public ItemWriter<Person> getItemWriter() {
        return new ItemWriter<Person>() {
            @Autowired  
            private PersonRepository personRepository;
            @Override
            public void write(List<? extends Person> items) throws Exception {
                personRepository.saveAll(items);
                
            }
        };
    }

}

Job config

package com.example.demo.config;

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.item.ItemProcessor;
import org.springframework.batch.item.ItemReader;
import org.springframework.batch.item.ItemWriter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.example.demo.dao.Person;

import lombok.RequiredArgsConstructor;

@Configuration
@RequiredArgsConstructor
public class JobConfig {
    private final JobBuilderFactory jobBuilderFactory;
    private final StepBuilderFactory stepBuilderFactory;
    private final ItemReader<Person> personItemReader;
    private final ItemWriter<Person> peronItemWriter;
    private final ItemProcessor<Person, Person> personItemProcessor;
    
    @Bean
    public Job personJob() {
        Step step1 = this.stepBuilderFactory.get("step-load-data")
                .<Person,Person>chunk(100)
                .writer(peronItemWriter)
                .reader(personItemReader)
                .processor(personItemProcessor)
                .build();
        
        return this.jobBuilderFactory.get("person-data-loader-job")
                    .start(step1)
                    .build();
    }

}

rest controller for launch the job

package com.example.demo.web;

import java.util.HashMap;
import java.util.Map;

import org.springframework.batch.core.BatchStatus;
import org.springframework.batch.core.Job;
import org.springframework.batch.core.JobExecution;
import org.springframework.batch.core.JobParameter;
import org.springframework.batch.core.JobParameters;
import org.springframework.batch.core.launch.JobLauncher;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import lombok.RequiredArgsConstructor;

@RestController
@RequiredArgsConstructor
public class PersonRestController {
    
    private final JobLauncher jobLauncher;
    private final Job job;
    
    @GetMapping("/startBatch")
    public BatchStatus load() throws Exception{
        Map<String, JobParameter> parameters = new HashMap<>();
        parameters.put("time", new JobParameter(System.currentTimeMillis()));
        JobParameters jobParameters = new JobParameters(parameters);
        JobExecution jobExecution = jobLauncher.run(job, jobParameters);
        while(jobExecution.isRunning()) {
            System.out.println("....");
        }
        return jobExecution.getStatus();
    }
    
    
    
}

application context中部分bean的依赖关系在Spring批次中形成一个循环

The dependencies of some of the beans in the application context form a cycle in Spring Batch

java

spring

spring-batch

spring-boot