Haixing Hu
We must know, we shall know

I found that using the command sudo mount –bind olddir newdir gets me out of trouble. If you don’t have root access then this won’t work for you. See mount --help or man mount for some more info on binding but it basically mounts one directory on top of another so it has the same affect as a symlink but it gets around tomcat’s limitation with symlinks.

More precisely, executes the following command:

sudo mount --bind /path/to/your/app /var/lib/tomcat7/webapps/myapp

and then the /var/lib/tomcat7/webapps/myapp will be linked to /path/to/your/app.

MySQL has no DROP USER IF EXISTS ... syntax.

The following code imexplicitly creates the user and then drop the user.

GRANT USAGE ON *.* TO 'username'@'localhost' IDENTIFIED BY 'password';
DROP USER 'username'@'localhost';

第一堂课

在上课时，我放了一个屁——很普通的屁。既不很臭，当然也绝对不香。

可怕的是，教授正在讲辩证法。

“请你自己对这个屁作一下判断，”教授说，“它好还是不好？”

我只得说：“不好。”

“错了，”教授说，“任何事物都有矛盾组成，有它不好的一面，肯定有它好的一面。”

“那么说它好也不对了？”我问。

“当然。”教授说。

“它既好又不好。”

“错了。你只看到矛盾双方对立斗争的一面，没有看到他们统一的一面。”

我只好认真看待这个严肃的问题，仔细想了想说：“这个屁既好又不好，但不好的一面是主要的，处于主导地位。”

“错了。你是用静止的观点看问题。矛盾的双方会相互转换，今天处于主导地位一面，明天一定处于次要地位。”

“你是说明天全人类会为了我的这个屁欢呼雀跃吗？”

“不尽如此，但不能否认这种发展趋势。”

Setup a SSH tunnel to as SOCKS proxy:

ssh -D 8085 yourname@your.gateway.com

Now tell maven to use the proxy we just created:

mvn -U clean install -DsocksProxyHost=127.0.0.1 -DsocksProxyPort=8085

Or export it to env for convenience.

export MAVEN_OPTS="-DsocksProxyHost=127.0.0.1 -DsocksProxyPort=8085"

This tutorial will show you how to use the maven-jar-plugin to create a manifest file, and package / add it into the final jar file. The manifest file is normally used to define following tasks :

1. Define the entry point of the Application, make the Jar executable.
2. Add project dependency classpath.