Java ModelMapper与Jooq记录的集成

====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.
     }

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;    
}

====我的DAO层类=====

// 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.
     }

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;    
}

---

有什么帮助吗？

有同样的问题，或者至少看起来是一样的。（您可以在最后一段中直接转到我的解决方案。）大量调试显示了以下内容：

如果该行（在您的问题中提到）上的访问器为空，则执行TypeInfoImpl类中的

accessors=PropertyInfoSetResolver.resolveAccessors（源、类型、配置）

line，在我的情况下，异常的原因是此调用：

valueReader.get（source，memberName）

在PropertyInfoSetResolver类中的“resolveAccessors”方法的以下代码段中：

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));

最后出现在

source.getValue（memberName.toUpperCase（））

，其中

source

是JOOQ的记录；发票记录在我的情况下。和-tada-由于某种原因，

invoice.getValue（“invoice_ID”）

最终会出现异常（没有这样的字段，因此

indexOf

返回

-1

，这会导致ArrayIndexOutOfBoundsException），而

invoice.getValue（“invoice_ID”）

完全没有问题

所以

else

条件（上面的同一段代码）不是执行代码的正确方法，而且

if

情况证明是正确的

---

这就是在我的特殊情况下帮助我的原因：删除行

modelMapper.getConfiguration（）.addValueReader（新的RecordValueReader（））

。希望这也能对您有所帮助。

我删除了该行，但运气不好。该行是

modelMapper.getConfiguration（）.setSourceNameTokenizer（NameTokenizers.下划线）是否仍存在于代码中？好吧，不管怎样，祝你好运！不，我把它注释掉并执行了。顺便说一句，我正在尝试使用联接从两个不同的表中获取所有字段。所以这不仅仅是在表记录上。我认为问题在于（正如您所解释的），RecordValueReader正在尝试将源（Jooq记录）成员名转换为大写，但至少在我的情况下，我将成员名转换为小写。我们是否可以在不忽略RecordValueReader（因为它在转换jooq记录时起作用）的情况下修复此问题？“我们是否可以在不忽略RecordValueReader（因为它在转换jooq记录时起作用）的情况下修复此问题？”-您是对的，这应该很重要，但我看到的唯一解决方案是编辑RecordValueReader类（例如，删除
toUpperCase（）
fragment），幸运的是它是一个小类，只有36行。