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Hibernate:java.lang.ClassCastException:java.lang.Integer无法转换为java.lang.Double

作者:互联网

我用Java定义的Staff实体是这样的:

final public class Staff {
    private int staffId;
    private String firstName = null;
    private String lastName = null;
    private String Email = null;
    private double salary;
    //and the setters and getters
}

我的查询代码:

SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
Session session = sessionFactory.openSession();
Staff staff = null;
try {
    Criteria criteria = session.createCriteria(dto.Staff.class);
    criteria.add(Restrictions.eq("salary", 1000000));
    staff = (Staff) criteria.uniqueResult();
} catch(Exception e) {
    System.out.println("Error : " + e);
} finally {
    session.close();
}

但是当我运行它时,我得到一个错误,它指出:

java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Double

如果我将数字显式转换为两倍,则可以使用:

criteria.add(Restrictions.eq("salary", (double) 1000000));

没有显式强制转换,有没有办法做到这一点?
我还认为在Java中,从Integer到Double的转换是隐式的吗?

解决方法:

Hibernate认为它是整数,告诉它是两倍.

    criteria.add(Restrictions.eq("salary",   1000000d));

标签:classcastexception,casting,hibernate,java
来源: https://codeday.me/bug/20191030/1966034.html