Java 使用getter方法时，我收到一个错误（HttpMessageNotWritableException:无法写入JSON:bean类的无效属性'；'）

我正在使用接口

loainterface.java

根据请求显示值。我的问题是我遇到了以下错误：

Invalid property 'accountNumber' of bean class [com.meteor.coral.portfolio.modules.loanaccount.domain.Loan$HibernateProxy$Vm2InzHB]: 
Getter for property 'accountNumber' threw exception; nested exception is java.lang.reflect.InvocationTargetException; 
nested exception is com.fasterxml.jackson.databind.JsonMappingException: Invalid property 'accountNumber' of bean class 
[com.meteor.coral.portfolio.modules.loanaccount.domain.Loan$HibernateProxy$Vm2InzHB]: Getter for property 'accountNumber' threw exception; 
nested exception is java.lang.reflect.InvocationTargetException 
(through reference chain: org.springframework.data.domain.PageImpl["content"]
->java.util.Collections$UnmodifiableRandomAccessList[0]->com.sun.proxy.$Proxy394["loanId"]->com.sun.proxy.$Proxy395["accountNumber"])]

这是我的

loainterface.java

@JsonPropertyOrder({
    "id",
    "accountNumber"
})
public interface LoanInterface {
    
    public Long getId();

    public String getAccountNumber();
}

@JsonPropertyOrder({
    "id",
    "loanId"
})
public interface BillingProcessInterface {
    
    public Long getId();
    
    public LoanInterface getLoanId();
}

@Entity
@Table(name = "m_billing")
@Data
@EqualsAndHashCode(callSuper = true)
public class BillingProcess extends AbstractPersistableCustom<Long> {
    
    @ManyToOne(optional = false, fetch = FetchType.LAZY)
    @JoinColumn(name = "loan_id", nullable = false)
    private Loan loanId;
}

这是模型，

Loan.java

，我想从中获取以下字段：

@Entity
@Component
@Data
@EqualsAndHashCode(callSuper = false)
@Table(name = "m_loan", uniqueConstraints = { @UniqueConstraint(columnNames = { "account_no" }, name = "loan_account_no_UNIQUE"),
        @UniqueConstraint(columnNames = { "external_id" }, name = "loan_externalid_UNIQUE") })
public class Loan extends AbstractPersistableCustom<Long> {

    @Column(name = "account_no", length = 20, unique = true, nullable = false)
    private String accountNumber;
}

BillingProcess.java

model，其中我调用

Loan.java

@JsonPropertyOrder({
    "id",
    "accountNumber"
})
public interface LoanInterface {
    
    public Long getId();

    public String getAccountNumber();
}

@JsonPropertyOrder({
    "id",
    "loanId"
})
public interface BillingProcessInterface {
    
    public Long getId();
    
    public LoanInterface getLoanId();
}

@Entity
@Table(name = "m_billing")
@Data
@EqualsAndHashCode(callSuper = true)
public class BillingProcess extends AbstractPersistableCustom<Long> {
    
    @ManyToOne(optional = false, fetch = FetchType.LAZY)
    @JoinColumn(name = "loan_id", nullable = false)
    private Loan loanId;
}

@实体
@表（name=“m_账单”）
@资料
@EqualsAndHashCode（callSuper=true）
公共类BillingProcess扩展了AbstractPersistableCustom{
@ManyToOne（可选=false，fetch=FetchType.LAZY）
@JoinColumn（name=“loan\u id”，nullable=false）
私人贷款；
}

来自

loainterface.java

的

getId

可以工作：

但是当我试图从

Loan.java

中获取其他字段时，比如

accountNumber

，我得到了错误

有人知道如何解决这个问题吗？我是否过度使用或缺少注释的使用？ 多谢各位