ModelMapper integration with Jooq Record

Question

====POJO====

// Employee POJO
     @JsonInclude(JsonInclude.Include.NON_NULL)
     @JsonNaming(PropertyNamingStrategy.LowerCaseWithUnderscoresStrategy.class)
     public class Employee implements Serializable {
       private Integer id;
       private String name;
       private Integer companyId;
       // assume getters ,setters and serializable implementations.
     }
// Company POJO
     @JsonInclude(JsonInclude.Include.NON_NULL)
     @JsonNaming(PropertyNamingStrategy.LowerCaseWithUnderscoresStrategy.class)
     public class Company implements Serializable {
       private Integer id;
       private String name;
       // assume getters ,setters and serializable implementations.
     }
// EmployeeVO POJO
     @JsonInclude(JsonInclude.Include.NON_NULL)
     @JsonNaming(PropertyNamingStrategy.LowerCaseWithUnderscoresStrategy.class)
     public class EmployeeVO implements Serializable {
       private Employee employee;
       private Company company;
       // assume getters ,setters and serializable implementations.
     }

=====我的DAO层类=====

public List<EmployeeVO> getEmployees(){     
    // configuring model mapper.
       ModelMapper modelMapper = new ModelMapper();
       modelMapper.getConfiguration()
                  .addValueReader(new RecordValueReader())
              .setSourceNameTokenizer(NameTokenizers.UNDERSCORE);
    //property map configuration.
      PropertyMap<Record, EmployeeVO> employeeVOMap = new PropertyMap<Record, EmployeeVO>() {
       protected void configure() {
          map().getEmployee().setName(this.<String>source("name"));
          map().getEmployee()..setId(this.<Integer>source("id"));
          map().getCompany().setName(this.<String>source("comp_name"));
          map().getCompany().setId(this.<String>source("comp_id"));
        }
     };
    // TypeMap config
    modelMapper.createTypeMap(Record.class, EmployeeVO.class);
    // adding employeeVOMap .
    modelMapper.addMappings(employeeVOMap);         
// JOOQ query  
    List<Field<?>> fields = Lists.newArrayList();  
    //  fields includes, id, name, comp_name, comp_id
    SelectJoinStep query = select(dslContext, fields).from(EMPLOYEE)
                                       .join(COMPANY)
                                       .on(COMPANY.ID.equal(EMPLOYEE.COMPANY_ID));    
        Result<Record> records = query.fetch();
    Record record = null;
        Iterator<Record> it = records.iterator();
        List<EmployeeVO> employeeList=  Lists.newArrayList();
        while (it.hasNext()) {
            record = it.next();
            EmployeeVO employeeVOObj =
                    modelMapper.map(record, EmployeeVO.class);
            employeeList.add(employeeVOObj);
        }
    return employeeList;    
}

=====错误日志=====

1） 错误mapping org.jooq.impl.RecordImpl to com.myportal.bingo.db.model.EmployeeVO1个错误]以及根本原因java.lang.ArrayIndexOutOfBoundsException：-1

注意：ModelMapper在到达下面的方法时抛出上面的异常

private void matchSource(TypeInfo<?> sourceTypeInfo, Mutator destinationMutator)在ImplicitMappingBuilder.java 中

sourceTypeInfo.getAccessors() is null.

有什么帮助吗？

Answer 1

有同样的问题，或者至少看起来是一样的。（您可以直接转到我在最后一段中的解决方案。）大量调试显示如下：

如果该行上的访问器（在您的问题中提到）为null，那么TypeInfoImpl类中的accessors = PropertyInfoSetResolver.resolveAccessors(source, type, configuration)行将被执行，在我的案例中异常的原因是这个调用：

在PropertyInfoSetResolver类中的"resolveAccessors"方法的以下代码段中的valueReader.get(source, memberName)：

if (valueReader == null)
  resolveProperties(type, true, configuration, accessors);
else {
  NameTransformer nameTransformer = configuration.getSourceNameTransformer();
  for (String memberName : valueReader.memberNames(source))
    accessors.put(nameTransformer.transform(memberName, NameableType.GENERIC),
        new ValueReaderPropertyInfo(valueReader, valueReader.get(source, memberName),
            memberName));

其在source.getValue(memberName.toUpperCase())中结束，其中source是JOOQ的记录；发票记录在我的情况下。并且-tada-由于某种原因，invoice.getValue("INVOICE_ID")最终出现在异常中（没有这样的字段，因此indexOf返回导致ArrayIndexOutOfBoundsException的-1），而invoice.getValue("invoice_id")完全可以。

因此，else条件（与上面的代码相同）不是执行代码的正确方式，if情况被证明是可以的

这就是在我的特殊情况下对我的帮助：删除modelMapper.getConfiguration().addValueReader(new RecordValueReader())行。希望这对你也有帮助。