StaxEventItemReader中的ClassCastException

时间:2019-07-16 16:04:15

标签: java spring-boot spring-batch

我对ClassCaseException有问题。我在Spring批处理中创建了XStreamItemEventReader,以读取xml并将结果写入数据库。读者我正在阅读应该解析为该类的xml:

@Data
@AllArgsConstructor
@NoArgsConstructor
public class EmployeeDTO {

    private Long id;
    private String firstName;
    private String surname;
    private String email;
    private Integer age;
}

我的xml项目读取器是在该类中创建的:

public final class XMLReader<T> extends StaxEventItemReader<T> implements ClosableItemReader<T> {
    public XMLReader(Map<String, Object> parameters) {

        setResource(new FileSystemResource((File) parameters.get(RESOURCE)));
        setFragmentRootElementName((String) parameters.get(ROOT_TAG));

        Map<String, String> aliases = (Map<String, String>) parameters.get(ALIASES_MAP);
        XStreamMarshaller marshaller = new XStreamMarshaller();
        marshaller.setAliases(aliases);
        setUnmarshaller(marshaller);
        setStrict(false);
        open(new ExecutionContext());
    }

然后是XMLReader在该类中的所有员工正在阅读的内容

public class EmployeeReader implements ItemReader<EmployeeDTO> {


    private final JobImportReaderFactory jobImportReaderFactory;
    private ClosableItemReader<EmployeeDTO> itemReader;

    public EmployeeReader(JobImportReaderFactory jobImportReaderFactory, JobFileRepository jobFileRepository) {
        this.jobImportReaderFactory = jobImportReaderFactory;
        this.jobFileRepository = jobFileRepository;
    }

    @BeforeStep
    public void setup() throws IOException {
        // this factory gives me XMLReader instance
        itemReader = jobImportReaderFactory.getItemReader(jobEnum, readerParameters, EmployeeDTO.class);

    }

    @Override
    public EmployeeDTO read() throws Exception {
        log.debug("read()");
        return itemReader.read();
    }
}

我的例外情况如下:

java.lang.ClassCastException:不能将com.kk.tutorial.domain.dtos.EmployeeDTO类强制转换为com.kk.tutorial.domain.dtos.EmployeeDTO类(com.kk.tutorial.domain.dtos.EmployeeDTO为在加载器'app'的未命名模块中; com.kk.tutorial.domain.dtos.EmployeeDTO在加载器org.springframework.boot.devtools.restart.classloader.RestartClassLoader @ 24eb3739的未命名模块中

我尝试在EmployeeDTO中实现Serializable,但是它不起作用。我知道这是ClassLoader的问题,但我不知道如何处理ClassLoader以及如何通过另一个ClassLoader将value从itemReader.read()传递给EmployeeDTO。您知道如何修理该铸件吗?

1 个答案:

答案 0 :(得分:1)

从pom.xml中删除spring-boot-devtools修复了一个问题