2019-04-23

ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.

错误信息如下:
ERROR 1820 (HY000): You must reset your password using ALTER USER statement
before executing this statement.

翻译过来的意思是:
错误1820 (HY000):您必须使用ALTER USER语句重置密码
在执行此语句之前。

2019-04-22

An internal error occurred during: Initializing Java Tooling.

详细错误信息:

1 2	An internal error occurred during: "Initializing Java Tooling". java.lang.NullPointerException

问题原因:不合理关闭Eclipse导致的

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2019-04-22

hexo 报错 Cannot read property 'replace' of null

详细错误信息:

FATAL Cannot read property 'replace' of null
TypeError: Cannot read property 'replace' of null
    at fs.exists.then.then.then.config (E:\Hexo\node_modules\hexo\lib\hexo\load_config.js:34:31)
    at tryCatcher (E:\Hexo\node_modules\bluebird\js\release\util.js:16:23)
    at Promise._settlePromiseFromHandler (E:\Hexo\node_modules\bluebird\js\release\promise.js:512:31)
    at Promise._settlePromise (E:\Hexo\node_modules\bluebird\js\release\promise.js:569:18)
    at Promise._settlePromise0 (E:\Hexo\node_modules\bluebird\js\release\promise.js:614:10)
    at Promise._settlePromises (E:\Hexo\node_modules\bluebird\js\release\promise.js:694:18)
    at _drainQueueStep (E:\Hexo\node_modules\bluebird\js\release\async.js:138:12)
    at _drainQueue (E:\Hexo\node_modules\bluebird\js\release\async.js:131:9)
    at Async._drainQueues (E:\Hexo\node_modules\bluebird\js\release\async.js:147:5)
    at Immediate.Async.drainQueues (E:\Hexo\node_modules\bluebird\js\release\async.js:17:14)
    at runCallback (timers.js:810:20)
    at tryOnImmediate (timers.js:768:5)
    at processImmediate [as _immediateCallback] (timers.js:745:5)

关键信息: Cannot read property ‘replace’ of null

问题原因:
我为了将我的wiki链接到hexo修改了root路径，如下图所示:

解决办法(将root改为原来的/即可解决这个问题):

这个/相当于默认指向developers-youcong.github.io

参考解决办法:
hexo 报错 Cannot read property ‘replace’ of null

2019-04-20

ftp配置详解

FTP配置详解

FTP配置文件位置/etc/vsftpd.conf
listen=NO
设置为YES时vsftpd以独立运行方式启动，设置为NO时以xinetd方式启动（xinetd是管理守护进程的，将服务集中管理，可以减少大量服务的资源消耗）
listen_ipv6=YES
以上两个只能一个YES一个NO否则会出错
listen_port=port
设置控制连接的监听端口号，默认为21
listen_address=ip_address
将在绑定到指定IP地址运行，适合多网卡
connect_from_port_20=YES/NO
若为YES，则强迫FTP－DATA的数据传送使用port 20，默认YES
anonymous_enable=YES

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2019-04-18

点击此电脑，查看属性获取计算机的基本信息，可以获取那些计算机基础知识信息呢

效果图如下:

从中我们可以get到处理器、内存、系统类型、系统版本等信息。

联系到实际这些信息有什么用呢？

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2019-04-17

this web application instance has been stopped already

详细错误信息如下:

1
2

[mybatis-plus MapperRefresh] org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading Illegal access: this web application instance has been stopped already. Could not load [META-INF/services/javax.xml.xpath.XPathFactory]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.
 java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load [META-INF/services/javax.xml.xpath.XPathFactory]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.

关键信息如下: