Portlet Factory, Version 6.1.2

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Overview: debugging an application

There are multiple ways to determine the cause of problems occurring in a web application.

You can use:

Debug tracing

To track down bugs in a model or application. The Debug Tracing builder allows you to trace variables and actions. This builder writes trace information to a log file allowing you review the logged trace output after you have run a model.By default this log file is given the following name:

web_app_dir\project_name\WEB-INF\logs\debugTracing.txt

Builder call timing tracing

You can analyze the time that builder calls take during regeneration. Use the builderCallTiming property in the log4j.properties file.

Designer Task view

To review errors and warnings that result from the builder generation code.

Application Server console

To view various execution errors and messages.

• Tuning for performance

  Applications created using IBM® WebSphere Portlet Factory need to be architected for performance.

• The log4j debug property

  To have debug tracing output written to the log file, the log4j.category.bowstreet.system.debugTracing property must be set to a value of INFO (default).

• Starting builder call timing tracing

  To analyze the time that builder calls take during regeneration, you can start builder call timing tracing.

• About using system tracing

  Use the system tracing feature to store the WebApp execution path and the execution time for each action (Page or Method).

• Debug Tracing builder

  Use the Debug Tracing builder to trace a variable or a specific action in a model.

• Interpreting a debug log file

  After you run your application, open the debugTracing.txt log. It should look similar to the following:

• Print the value of a variable

  You can use a tool available from the Action List builder to generate a System.out.println statement.

• Debug with Eclipse/RAD using Factory Model Execution Debugging

  The Factory Model Execution Debugger support enables model developers to easily leverage the Eclipse/RAD integrated debugger.

• Enabling debug tracing

  Before you use the Debug Tracing builder, set the bowstreet.system.debugTracing property to DEBUG.

• IBM WebSphere Portlet Factory Designer Task view error messages

  Errors and warnings that result from a builder's generation code are sent to the IDE's Tasks view.

Parent topic: Working with WebSphere Portlet Factory

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