ERROR: Could not find a version that satisfies the requirement pymysql (from versions: none)
Posted 秋秋2021
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踩过的坑
不管是idea中直接引入还是 pip3 install pymysql 都会报错:ERROR: Could not find a version that satisfies the requirement pymysql (from versions: none)
原因是 网络问题,需要需要使用国内镜像源来加速,比如豆瓣源
pip install pymysql -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com
解决问题参考:https://blog.csdn.net/T_Y_F_/article/details/126225407,感谢博主分享
ERROR StatusLogger Log4j2 could not find a logging
环境
- Linux/Ubuntu20.04LTS
- IntelliJ IDEA Community Editon 2021.1
- maven 3.6.3
- jetty 11.0.5
- struts2 2.5.14.1
异常
ERROR StatusLogger Log4j2 could not find a logging implementation. Please add log4j-core to the classpath. Using SimpleLogger to log to the console...
使用mvn jetty:run插件来运行web应用,出现异常!
原因
缺少了日志类Log4j2相应的包
方案
- 缺少log4j-core包,在配置文件pom.xml添加相应的依赖
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.14.1</version>
</dependency>
在项目resources下配置日志输出格式文件log4j2.xml
<?xml version="1.0" encoding="UTF-8"?>
<Configuration>
<Appenders>
<Console name="STDOUT" target="SYSTEM_OUT">
<PatternLayout pattern="%d %-5p [%t] %C{2} (%F:%L) - %m%n"/>
</Console>
</Appenders>
<Loggers>
<Logger name="com.opensymphony.xwork2" level="debug"/>
<Logger name="org.apache.struts2" level="debug"/>
<Root level="warn">
<AppenderRef ref="STDOUT"/>
</Root>
</Loggers>
</Configuration>
或是log4j.properties
log4j.rootLogger=WARN, console
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.conversionPattern=%5p [%t] (%F:%L) - %m%n
从 Struts 2.2.3 版开始 您不需要为 javassist 指定单独的依赖项节点。
使用两者 log4j-core
和 log4j-api
允许使用 最新版本的 Log4j2 而不会与框架提供的版本发生冲突。
参考
- https://mvnrepository.com/art...
说明
- 【遇上雨季,吃定彩虹】 --Layuji
- 由个人整理发布,编写过程难免有所遗漏或错误,恳请指出,以免误导大家!
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