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| <title>Debugging a servlet on a server</title> |
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| <h1 class="topictitle1">Debugging a servlet on a server</h1> |
| <div><p>The debugger enables you to detect and diagnose errors in your |
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| application. It allows you to control the execution of your program by setting |
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| breakpoints, suspending threads, stepping through the code, and examining |
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| the contents of the variables. You can debug a servlet on a server without losing the state of your application. </p><div class="skipspace">To debug a servlet on a server:</div> |
| <ol><li class="skipspace"><span>In the Project Explorer view, open your servlet.</span> In |
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| a Web project, servlets are located in the JavaSource folder. The servlet opens in |
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| the Java editor.</li> |
| <li class="skipspace"><span>To set one or more breakpoints in the editor, double-click in the |
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| margin beside the line of code that you want to set as a breakpoint.</span></li> |
| <li class="skipspace"><span>Ensure the project is associated to run on a server.</span></li> |
| <li class="skipspace"><span>Select the servlet and from the servlet's context menu in the Project |
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| Explorer view, click <span class="uicontrol">Debug As > Debug on Server</span>.</span> Open the Servers view to see that the server is launched.</li> |
| <li class="skipspace"><span>When the breakpoint is hit, the Debug view opens.</span> Step |
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| through the code, inspect and display variables, and make any necessary changes |
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| to the servlet. For detailed information on debugging, refer to the online |
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| help.</li> |
| <li class="skipspace"><span>When you are finished debugging, remove the breakpoint and save |
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| the servlet.</span></li> |
| <li class="skipspace"><span>Click the <span class="uicontrol">Resume</span> icon on the Debug toolbar |
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| to execute the servlet.</span></li> |
| <li class="skipspace"><span>If you have hot method replace enabled, your changes are already |
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| in the running application.</span></li> |
| <li class="skipspace"><span>If you have automatic class reloading enabled, which is the default |
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| setting, click the <span class="uicontrol">Refresh</span> icon in the Web Browser |
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| to update the changes.</span> You do not lose the state of your application.</li> |
| <li class="skipspace"><span>You lose the state of the application.</span> To update the |
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| changes restart the server. |
| </li> |
| </ol> |
| <div class="skipspace">The server recognizes your changes. |
| </div> |
| </div> |
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