i. apache tomcat

• tomcat - a minimalistic user's guide (link)
• what is apache tomcat? the beginner's guide to java apps (link)

ii. jsp and servlets

• getting started with jsp and servlets: a beginner's guide (link)
• jsp and java servlet programming (link)
• fundamentos de servlets (link)
• introduction to java servlets (link)
• servlets - ibm documentation (link)
• servlets em java: conceito, criação, funcionamento e mapeamento (link)
• o que são servlets em java (link)
• java servlet technology (link)
• servlet (java ee 6) (link)
• servlets (link)

iii. java exceptions

• entendendo java exceptions (link)
• IOException - documentação (link)