Debugging Servlets

• Use print statements; run server on desktop
• Use Apache Log4J
• Integrated debugger in IDE
– Right-click in left margin in source to set breakpoint (Eclipse)
– R-click Tomcat and use “Debug” instead of “Start”
R click
• Look at the HTML source
• Return error pages to the client
– Plan ahead for missing or malformed data
• Use the log file
– log(“message”) or log(“message”, Throwable)
• Separate the request and response data.
– Request: see EchoServer at
– Response: see WebClient at
• Make sure browser is not caching
– Internet Explorer: use Shift-RELOAD
– Firefox: use Control-RELOAD
• Stop and restart the server


About lorddisk

WebCenter Content, WebCenter Portal, WebCenter Sites,Weblogic, Identity and Access Management (IAM),SSO,OAM,OIM,OAAM,OUD, OPAM,OID, OVD ,Oracle API Gateway ,OBIEE,OEDQ, Oracle ADF, Oracle SOA,J2EE, CackePHP ,PHP,J2SE,J2EE,Spring,Hibernate,JQuery,CSS,Java Script ,Joomla,Drupal,Worpress
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