实体类明明存在，但就是找不到

500错误
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [spring-mapper.xml]: Invocation of init method failed; nested exception is org.springframework.core.NestedIOException: Failed to parse config resource: class path resource [mybatis-config.xml]; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error registering typeAlias for 'Books'. Cause: java.lang.ClassNotFoundException: Cannot find class: com.OCTDN.pojo.Books

org.springframework.core.NestedIOException: Failed to parse config resource: class path resource [mybatis-config.xml]; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error registering typeAlias for 'Books'. Cause: java.lang.ClassNotFoundException: Cannot find class: com.OCTDN.pojo.Books

org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error registering typeAlias for 'Books'. Cause: java.lang.ClassNotFoundException: Cannot find class: com.OCTDN.pojo.Books

org.apache.ibatis.builder.BuilderException: Error registering typeAlias for 'Books'. Cause: java.lang.ClassNotFoundException: Cannot find class: com.OCTDN.pojo.Books

java.lang.ClassNotFoundException: Cannot find class: com.OCTDN.pojo.Books

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

package com.OCTDN.pojo;

public class Books {
    private int id;
    private String bookname;
    private int bookCounts;
    private String detail;
    public Books() {
    }
    public Books(int id, String bookname, int bookCounts, String detail) {
        this.id = id;
        this.bookname = bookname;
        this.bookCounts = bookCounts;
        this.detail = detail;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getBookname() {
        return bookname;
    }
    public void setBookname(String bookname) {
        this.bookname = bookname;
    }
    public int getBookCounts() {
        return bookCounts;
    }
    public void setBookCounts(int bookCounts) {
        this.bookCounts = bookCounts;
    }
    public String getDetail() {
        return detail;
    }
    public void setDetail(String detail) {
        this.detail = detail;
    }
    @Override
    public String toString() {
        return "Books{" +
                "id=" + id +
                ", bookname='" + bookname + '\'' +
                ", bookCounts=" + bookCounts +
                ", detail='" + detail + '\'' +
                '}';
    }
}

有没有大佬能指点指点

随便写一个类都找不到啊

清除一下idea的缓存