解决JPA “Null value was assigned to a property of primitive type setter of” 异常

今天在使用JPA保存数据时抛出了如下错误信息：

[ERROR]-[20-01-03 09:12:58 763]-[http-nio-8080-exec-5]-[c.g.e.s.UserService]: 保存用户信息失败

org.springframework.orm.jpa.JpaSystemException: Null value was assigned to a property of primitive type setter of com.huangx.model.entity.User.userId; nested exception is org.hibernate.PropertyAccessException: Null value was assigned to a property of primitive type setter of com.huangx.model.entity.User.userId

    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:333)

    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:244)

    ...

    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)

    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)

    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)

    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)

    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)

    at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)

    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)

    at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)

    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)

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从上面异常 “Null value was assigned to a property of primitive type setter of com.huangx.model.entity.User.userId; ” 将 Null值赋值给原始类型的 User.userId 的 setter 失败。User.java 如下：

@Data
@Entity
@Table(name = "users")
public class AlarmThresholdLog {
    @Id
    @Column(name = "user_id")
    private long userId;
}

将上面的

private long userId;

改为

private Long userId;

即可解决该问题。