一些问题

已连接到目标 VM, 地址: ''127.0.0.1:64995'，传输: '套接字''
Error: A JNI error has occurred, please check your installation and try again
线程 "main" 中发生异常java.lang.UnsupportedClassVersionError: JVMCFRE003 主要版本错误；类=icu/guodapeng/file/FileConsumerApplicationKt，偏移量=6
	at java.lang.ClassLoader.defineClassImpl(Native Method)
	at java.lang.ClassLoader.defineClassInternal(ClassLoader.java:398)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:359)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:682)
	at java.net.URLClassLoader.access$400(URLClassLoader.java:89)
	at java.net.URLClassLoader$ClassFinder.run(URLClassLoader.java:1086)
	at java.security.AccessController.doPrivileged(AccessController.java:770)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:589)
	at java.lang.ClassLoader.loadClassHelper(ClassLoader.java:953)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:898)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:881)
	at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:601)
与目标 VM 断开连接, 地址为: ''127.0.0.1:64995'，传输: '套接字''

进程已结束，退出代码为 1

...

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-09-03 19:39:23.978 ERROR 28777 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userDao': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalArgumentException: Validation failed for query for method public abstract com.gdp.demo3.entity.User com.gdp.demo3.dao.UserDao.findByUsername(java.lang.String)!

...

package com.xxx.xxx.entity

import java.util.*
import javax.persistence.*
import javax.validation.constraints.NotEmpty
import javax.validation.constraints.Size

@Table(name = "user")
@Entity
class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    var id: Long = -1

    @Column(unique = true)
    @NotEmpty(message = "用户名不能为空")
    @Size(message = "用户名长度在1～20之间", max = 100, min = 1)
    var userName: String = ""

    @NotEmpty(message = "密码不能为空")
    @Size(message = "密码长度在6～100之间", max = 100, min = 6)
    var password: String = ""
}