StackOverflowのメンバーの皆さん、問題を見つけましたが、今では、これらの時間中ずっと髪を抜くことができません。
On Eclipse Juno, there is a selection to "Organnize Imports" of the Java source." So when I have an undefined variable, I use this convenient option to clear up the imports. Eclipse Juno imported the mysql connector, "java.sql. connection" instead of the "com.mysql.jdbc.connection" connector. I changed the imports of the java sources, and now I'm good to move forward with this servlet. But not after I go out and get some Propecia or Rogaineまたは？。...RoyW。