参数类型不匹配

Question

DTO对象：

public class DTOUser implements UserDetails { 
/** 
* 
*/ 
private static final long serialVersionUID = -769714837633005963L; 
private Long id; 
private String account; 
private String password; 
private String statusStr; 
private UserStatus status; 
private int systemAdmin; 
private long operator; 
private String operateTime; 
private String name; 
private String company; 
private String email; 
private String telephone; 
private List<DTOAuthority> dtoAuthorities = new ArrayList<DTOAuthority>(); 
private List<DTOAgreement> dtoAgreements = new ArrayList<DTOAgreement>();} 

实体：

@Entity 
@Table(name="adt_user") 
public class User { 
private long id; 
private String account; 
private String password; 
private String statusStr; 
private UserStatus status; 
private int systemAdmin; 
private long operator; 
private String operateTime; 
private String name; 
private String company; 
private String email; 
private String telephone; 
private Set<Authority> authorities = new HashSet<Authority>(); 
private Set<Agreement> agreements = new HashSet<Agreement>();} 

我使用波纹管的方法来值复制到实体，但有一个例外：

 
java.lang.IllegalArgumentException: Cannot invoke com.hna.adt.orm.User.setAuthorities - argument type mismatch 

它有什么问题？

BeanUtils.copyProperties(entity, value); 

Answer 1

你有

private List<DTOAuthority> dtoAuthorities = new ArrayList<DTOAuthority>(); 

与

private Set<Authority> authorities = new HashSet<Authority>(); 

如果BeanUtils.copyProperties只考虑制定者和元素的getter和不够聪明弄清楚，Set和List都集合和迭代并复制元素一个接一个 - 这仍然要求Authority兼容DTOAuthority - 然后它会抛出这个反射错误，然后Set我不可从List转让，即不兼容。

如果你试图做同样在编译时

entity.setAuthorities(value.getDtoAuthorities()); 

然后你会得到相同的sessage的编译错误。

您应该将dtoAuthorities更改为Set或authorities为List。

Answer 2

如果您检查权限和协议的类型，它们与其他类定义不匹配。为了beanutils正常工作，请确保属性的类型匹配。