Servlets

The building stone of a Java EE Web Application. Almost all frameworks are built on top of Servlets.

Tutorials

  1. 1 Stack Overflow Servlets (mini tutorial) 188
  2. 2 Java EE 7 tutorial chapter 17 102
  3. 3 CoreServlets.com Tomcat 7 + Eclipse 50
  4. 4 CoreServlets.com Beginning Servlets 63
  5. 5 CoreServlets.com Advanced Servlets 27
  6. 6 Core Servlets and JSP eBook (free!) 48

General Servlet facts

  1. 1 How do servlets work? 237
  2. 2 Difference between JSF, Servlet and JSP 112
  3. 3 Servlet instances and threadsafety 36
  4. 4 URL pattern difference between / and /* 36
  5. 5 Should I close response output stream? 27
  6. 6 Should I flush response output stream? 26
  7. 7 Using getRealPath() 15
  8. 8 XSS prevention 43

X vs Y

  1. 1 doGet vs doPost 51
  2. 2 forward vs sendRedirect 35
  3. 3 Servlet vs Filter 33
  4. 4 Servlet vs RESTful 99
  5. 5 getResourceAsStream() vs FileInputStream 9
  6. 6 HttpSessionBindingListener vs HttpSessionAttributeListener 7
  7. 7 ServletContainerInitializer vs ServletContextListener 7
  8. 8 request.setAttribute() vs session.setAttribute() 12

Application architecture

  1. 1 Design patterns in Java web applications 76
  2. 2 MVC with JSP, Servlets and JDBC 60
  3. 3 Placing configuration properties files 16
  4. 4 Performing application initialization 19
  5. 5 Running a background timer task 25
  6. 6 Creating reusable web fragment project 12
  7. 7 Point of META-INF folder 12
  8. 8 Unicode UTF-8 character encoding 5

Filters

  1. 1 How does "Chain of Responsibility" work? 34
  2. 2 Create an URL rewrite filter 12
  3. 3 Define filter order using annotations only 3
  4. 4 Exclude URLs from filter mapping 4
  5. 5 Avoid back button to show old page 17
  6. 6 Log response content 6

Tips and tricks

  1. 1 Generate HTML response 13
  2. 2 Set request character encoding in Tomcat 3
  3. 3 Distinguish pressed submit button 3
  4. 4 Showing validation messages in JSP 0
  5. 5 Populate javabeans with request params 7
  6. 6 Send permanent (301) redirect 3
  7. 7 Send an email 10
  8. 8 Programmatically send HTTP requests 6

Why this or that?

  1. 1 getParameterMap() returns String[] values 14
  2. 2 Separate <servlet> and <servlet-mapping> 5
  3. 3 HttpServlet is an abstract class 9
  4. 4 getCharacterEncoding() returns null 4
  5. 5 forward() does not change URL 0

JavaScript/Ajax

  1. 1 Calling Servlet with JavaScript/Ajax 28
  2. 2 Using Servlets with jQuery and JSON 9
  3. 3 Simple calculator in JSP 8
  4. 4 Upload file with FormData 5
  5. 5 HTML5 drag and drop file upload 7
  6. 6 Send data from JavaScript to Servlet 2
  7. 7 Send data from Servlet to JavaScript 0

File uploading and serving

  1. 1 Upload files to server with HTML 9
  2. 2 Upload files to server with jQuery 10
  3. 3 Check if uploaded file is an image 4
  4. 4 Saving an uploaded file 11
  5. 5 Display images from database in JSP 15
  6. 6 Serving files and other static data 23
  7. 7 Streaming audio/video/media files 12
  8. 8 Template for resource servlet with caching 7

Troubleshooting

  1. 1 @WebServlet annotation doesn't work 4
  2. 2 Cookie value arrives with quotes 1
  3. 3 HTTP error 404: The requested resource is not available 0
  4. 4 HTTP error 405: HTTP method is not supported by this URL 0
  5. 5 Trying to use javax.servlet.* in Eclipse causes NoClassDefFoundError, NoSuchFieldError, NoSuchMethodError, AbstractMethodError, VerifyError, LinkageError, etc 2
  6. 6 java.lang.IllegalStateException: Cannot forward after response has been committed 4
  7. 7 java.lang.IllegalStateException: Cannot create a session after the response has been committed 2
  8. 8 The content of element type "web-app" must match "(....)" 1

JSP

  1. 1 Avoid Java code in JSP files 15
  2. 2 Populate cascading dropdowns 18
  3. 3 Transfer data from JSP to servlet 18
  4. 4 Pass object from Servlet to JSP and back 16
  5. 5 Create dynamic table based on ResultSet 5
  6. 6 Show message in JSP after redirect 7
  7. 7 Call servlet from JSP on page load 5
  8. 8 Retain input values after submit 0

Sessions and logins

  1. 1 Session management 31
  2. 2 Session timeout 14
  3. 3 Invalidate/destroy/delete a session 6
  4. 4 Share session between contexts in Tomcat 4
  5. 5 Call a method before session is destroyed 4
  6. 6 Get logged-in user and roles 9
  7. 7 Prevent multiple logins by same user 13
  8. 8 Implement "Remember me" login 8

Servlet based frameworks

  1. 1 Action vs component based MVC 0
  2. 2 JSF (component based MVC) 50
  3. 3 JAX-RS (RESTful web service) 31
  4. 4 Spring MVC (action based MVC) 19
  5. 5 Wicket (component based MVC) 8
  6. 6 Struts (action based MVC) 8
  7. 7 Stripes (action based MVC) 13

EL

  1. 1 How does EL ${} access objects? 7
  2. 2 EL expressions not evaluated in JSP 2
  3. 3 Reference constants in EL 2
  4. 4 Call a static method in EL 1
  5. 5 Concatenate Strings in EL 2
  6. 6 How to access Scriptlet <% %> in EL? 0
  7. 7 How to access EL ${} in Scriptlet? 0

Databases / JDBC

  1. 1 Where to place the JDBC driver 6
  2. 2 How to connect to database? 20
  3. 3 Initialize applicationwide DataSource 17
  4. 4 Is a static/applicationwide connection safe? 17
  5. 5 Show ResultSet in HTML table using DAO 0

URLs and paths

  1. 1 Get request URL 3
  2. 2 Get request URI without context path 3
  3. 3 Get URL path parameters 2
  4. 4 Referencing JS/CSS/image resources 5
  5. 5 Using relative paths without context path 6
  6. 6 Remove Eclipse project name from URL 3

Cookies

  1. 1 Change/update existing cookie 11
  2. 2 Delete a cookie 8

Error pages

  1. 1 Specifying default error pages 4
  2. 2 Get exception object in error page 3
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