使用ClassifierCompositeItemWriter的Spring Batch Java配置错误

我正在使用带有Java配置的Spring Batch（对此不熟悉），并且在尝试使用ClassifierCompositeItemWriter时遇到错误，因此基于分类器生成单独的文件。

我收到的错误是org.springframework.batch.item.WriterNotOpenException：必须先打开Writer，然后才能将其写入

我的配置如下所示：

    package com.infonova.btcompute.batch.geneva.job;

import com.infonova.btcompute.batch.billruntransfer.BillRunTranStatusFinishedJobAssignment;
import com.infonova.btcompute.batch.billruntransfer.BillRunTranStatusInprogressJobAssignment;
import com.infonova.btcompute.batch.billruntransfer.BillRunTransferStatus;
import com.infonova.btcompute.batch.geneva.camel.GenevaJobLauncher;
import com.infonova.btcompute.batch.geneva.dto.GenevaDetailsResultsDto;
import com.infonova.btcompute.batch.geneva.dto.GenveaDetailsTransactionDto;
import com.infonova.btcompute.batch.geneva.properties.GenevaDetailsExportJobProperties;
import com.infonova.btcompute.batch.geneva.rowmapper.GenevaDetailsTransactionsRowMapper;
import com.infonova.btcompute.batch.geneva.steps.*;
import com.infonova.btcompute.batch.repository.BillrunTransferStatusMapper;
import com.infonova.btcompute.batch.utils.FileNameGeneration;
import com.infonova.product.batch.camel.CamelEnabledJob;
import org.apache.camel.Processor;
import org.apache.camel.builder.RouteBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.core.step.tasklet.Tasklet;
import org.springframework.batch.item.file.FlatFileItemWriter;
import org.springframework.batch.item.support.ClassifierCompositeItemWriter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.classify.BackToBackPatternClassifier;
import org.springframework.context.annotation.Bean;
import org.springframework.core.io.FileSystemResource;
import org.springframework.jdbc.core.JdbcTemplate;

import javax.sql.DataSource;
import java.io.File;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;


public abstract class AbstractGenevaDetailsExportJob extends CamelEnabledJob {

    private static final Logger LOGGER = LoggerFactory.getLogger(AbstractGenevaDetailsExportJob.class);

    @Autowired
    protected JobBuilderFactory jobBuilders;

    @Autowired
    protected StepBuilderFactory stepBuilders;

    @Autowired
    protected DataSource datasource;

    @Autowired
    private BillrunTransferStatusMapper billrunTransferStatusMapper;

    @Autowired
    protected JdbcTemplate jdbcTemplate;


    public abstract GenevaDetailsExportJobProperties jobProperties();

    @Bean
    public RouteBuilder routeBuilder(final GenevaDetailsExportJobProperties jobProperties, final Job job) {
        return new RouteBuilder() {
            @Override
            public void configure() throws Exception {
                from(jobProperties.getConsumer())
                        .transacted("PROPAGATION_REQUIRED")
                        .routeId(jobProperties.getInputRouteName())
                        .process(genevaJobLauncher(job));
                        //.to("ftp://[email protected]?password=secret");
            }
        };
    }

    @Bean
    public Processor genevaJobLauncher(Job job) {
        return new GenevaJobLauncher(job);
    }

    @Bean
    @StepScope
    public GenevaDetailsReader reader() {
        GenevaDetailsReader reader = new GenevaDetailsReader(jobProperties().getMandatorKey(),
                jobProperties().getInvoiceType(), jobProperties().getSqlResourcePath());
        reader.setSql("");
        reader.setDataSource(datasource);
        reader.setRowMapper(new GenevaDetailsTransactionsRowMapper());
        reader.setFetchSize(jobProperties().getFetchSize());
        return reader;
    }

    @Bean
    @StepScope
    public GenevaDetailsItemProcessor processor() {
        return new GenevaDetailsItemProcessor();
    }

    @Bean
    @StepScope
    public ClassifierCompositeItemWriter writer() {

        List<String> serviceCodes = new ArrayList<>();//billrunTransferStatusMapper.getServiceCodes(jobProperties().getMandatorKey());
        Long billingTaskId = billrunTransferStatusMapper.getCurrentTaskId(jobProperties().getMandatorKey());
        String countryKey = billrunTransferStatusMapper.getCountryKey(billingTaskId);
        serviceCodes.add("BTCC");
        serviceCodes.add("CCMS");

        BackToBackPatternClassifier classifier = new BackToBackPatternClassifier();
        classifier.setRouterDelegate(new GenveaDetailsRouterClassifier());

        HashMap<String, Object> map = new HashMap<>();

        for (String serviceCode : serviceCodes) {
            map.put(serviceCode, genevaDetailsWriter(serviceCode, countryKey));
        }

        classifier.setMatcherMap(map);
        ClassifierCompositeItemWriter<GenveaDetailsTransactionDto> writer = new ClassifierCompositeItemWriter<>();
        writer.setClassifier(classifier);
        return writer;

    }


    @Bean
    @StepScope
    public GenevaDetailsFlatFileItemWriter genevaDetailsWriter(String serviceCode, String countryKey) {
        GenevaDetailsFlatFileItemWriter writer = new GenevaDetailsFlatFileItemWriter(jobProperties().getDelimiter());

        FileNameGeneration fileNameGeneration = new FileNameGeneration();

        try {
            FileSystemResource fileSystemResource = new FileSystemResource(new File(jobProperties().getExportDir(), fileNameGeneration.generateFileName(jdbcTemplate,
                    serviceCode, countryKey)));
            writer.setResource(fileSystemResource);
        } catch (SQLException e) {
            LOGGER.error("Error creating FileSystemResource : " + e.getMessage());
        }
        return writer;
    }

    @Bean
    public Job job() {
        return jobBuilders.get(jobProperties().getJobName())
                .start(setBillRunTransferStatusDetailInprogressStep())
                .next(processGenevaDetailsStep())
                .next(setBillRunTransferStatusProcessedStep())
                .build();
    }

    @Bean
    public Step setBillRunTransferStatusDetailInprogressStep() {
        return stepBuilders.get("setBillRunTransferStatusDetailInprogressStep")
                .tasklet(setBillRunTransferStatusDetailInprogress())
                .build();
    }

    @Bean
    public Tasklet setBillRunTransferStatusDetailInprogress() {
        return new BillRunTranStatusInprogressJobAssignment(BillRunTransferStatus.SUMMARY.toString(), BillRunTransferStatus.DETAILS_INPROGRESS.toString(),
                jobProperties().getMandatorKey(), jobProperties().getInvoiceTypeNum(), jobProperties().getReportTypeNum());
    }

    @Bean
    public Step setBillRunTransferStatusProcessedStep() {
        return stepBuilders.get("setBillRunTransferStatusProcessedStep")
                .tasklet(setBillRunTransferStatusProcessed())
                .build();
    }

    @Bean
    public Tasklet setBillRunTransferStatusProcessed() {
        return new BillRunTranStatusFinishedJobAssignment(BillRunTransferStatus.PROCESSED.toString());
    }

    @Bean
    public Step processGenevaDetailsStep() {
        return stepBuilders.get("processGenevaDetailsStep")
                .<GenveaDetailsTransactionDto, GenevaDetailsResultsDto>chunk(jobProperties().getChunkSize())
                .reader(reader())
                .processor(processor())
                .writer(writer())
                .build();
    }

}

我的作家看起来像：

package com.infonova.btcompute.batch.geneva.steps;

import com.infonova.btcompute.batch.geneva.dto.GenevaDetailsResultsDto;
import com.infonova.btcompute.batch.repository.BillrunTransferStatusMapper;
import com.infonova.btcompute.batch.utils.FileNameGeneration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.batch.core.StepExecution;
import org.springframework.batch.core.annotation.BeforeStep;
import org.springframework.batch.item.*;
import org.springframework.batch.item.file.FlatFileHeaderCallback;
import org.springframework.batch.item.file.FlatFileItemWriter;
import org.springframework.batch.item.file.transform.BeanWrapperFieldExtractor;
import org.springframework.batch.item.file.transform.DelimitedLineAggregator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.FileSystemResource;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Component;

import java.io.File;
import java.io.IOException;
import java.io.Writer;
import java.sql.SQLException;
import java.util.Iterator;
import java.util.List;

@Component
public class GenevaDetailsFlatFileItemWriter extends FlatFileItemWriter<GenevaDetailsResultsDto> {

    private static final Logger LOGGER = LoggerFactory.getLogger(GenevaDetailsFlatFileItemWriter.class);

    @Autowired
    protected JdbcTemplate jdbcTemplate;

    @Autowired
    private BillrunTransferStatusMapper billrunTransferStatusMapper;


    private String delimiter;


    public GenevaDetailsFlatFileItemWriter(String delimiter) {
        this.delimiter = delimiter;
        this.setLineAggregator(getLineAggregator());
        this.setHeaderCallback(getHeaderCallback());
    }

    private DelimitedLineAggregator<GenevaDetailsResultsDto> getLineAggregator() {
        DelimitedLineAggregator<GenevaDetailsResultsDto> delLineAgg = new DelimitedLineAggregator<>();
        delLineAgg.setDelimiter(delimiter);

        BeanWrapperFieldExtractor<GenevaDetailsResultsDto> fieldExtractor = new BeanWrapperFieldExtractor<>();
        fieldExtractor.setNames(getNames());
        delLineAgg.setFieldExtractor(fieldExtractor);

        return delLineAgg;
    }

    private String[] getHeaderNames() {
        return new String[] {"Record ID", "Service Identifier", "Billing Account Reference", "Cost Description", "Event Cost",
                "Event Date and Time", "Currency Code", "Charge Category", "Order Identifier", "Net Usage", "UOM",
                "Quantity", "Service Start Date", "Service End Date"};
    }

    private String[] getNames() {
        return new String[] {"RECORD_ID", "SERVICE_CODE", "BILLING_ACCOUNT_REFERENCE", "COST_DESCRIPTION", "EVENT_COST",
                "EVENT_DATE_AND_TIME", "CURRENCY_CODE", "CHARGE_CATEGORY", "ORDER_IDENTIFIER", "NET_USAGE", "UOM",
                "QUANTITY", "SERVICE_START_DATE", "SERVICE_END_DATE"};
    }



    private FlatFileHeaderCallback getHeaderCallback()
    {
        return new FlatFileHeaderCallback() {
            @Override
            public void writeHeader(Writer writer) throws IOException {
                writer.write(String.join(delimiter, getHeaderNames()));
            }
        };
    }

//    @BeforeStep
//    public void beforeStep(StepExecution stepExecution) {
//        billingTaskId = (Long) stepExecution.getJobExecution().getExecutionContext().get("billingTaskId");
//        FileNameGeneration fileNameGeneration = new FileNameGeneration();
//
//        try {
//            FileSystemResource fileSystemResource = new FileSystemResource(new File(exportDir, fileNameGeneration.generateFileName(jdbcTemplate,
//                    serviceCode, billrunTransferStatusMapper.getCountryKey(billingTaskId))));
//            setResource(fileSystemResource);
//        } catch (SQLException e) {
//            LOGGER.error("Error creating FileSystemResource : " + e.getMessage());
//        }
//    }
}

我已经在网上搜索过，找不到解决此问题的方法。