In the WebSphere enterprise applications screen, we have the ability to start and stop installed applications. Below is a table explaining the actions that can be performed against one or more selected applications:
Start :- When an application is stopped, you will see an icon which is a green arrow representing a start button. To start, select one or more applications and click on the Start button.
Stop :- When an application is started, you will see a red-cross shape icon representing a stop button. To stop, select one or more applications and click the Stop button.
Install :- As a part of deploying an application, you install application files on a server. Depending on EAR/WAR complexity, the deployment wizard will dynamically produce a guide of steps which requires user input.
Uninstall :- Select applications you wish to uninstall. It is recommended you stop applications first.
Update :- Used to apply delta updates. Only the application code elements that have been changed in the application since last deployment are updated while the application continues running.
Rollout Update :- If an application is deployed across multiple nodes, you can use the Rollout Update option which replaces the application one node at a time. Using this method reduces the amount of time that any single node member is unavailable for service during application deployment.
Remove File :- Deletes a file of the deployed application or module. Remove File deletes a file from the configuration repository and from the filesystem of all the nodes where the file is installed.
Export :- Allows the application to be exported as an EAR file. Can be used to back up an application version.
Export DDL :- By using the Export DDL option, you can export DDL (Data Definition Language) files located within database-aware EJB modules.
Export File :- Allows the exporting of a specific file from an enterprise application or module.
2. When an application has successfully started, you will get a message similar to the one shown in the following screenshot:
The default application contains a very useful administration Servlet called snoop.
The snoop servlet is an excellent tool to use in testing. Snoop reports on the following attributes:
• Servlet context initialization parameters
• URL invocation request parameters
• Preferred client locale
• Context path
• User principal
• Request headers and their values
• Request parameter names and their values
• HTTPS protocol information
• Servlet request attributes and their values
• HTTP session information
• Session attributes and their values