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    <p>First of all, it's not recommended to embed java code in a java servlet page, you should only take care of the presentation layer in the jsp, no business logic, you need a servlet to take the http request, do your logic, put the results on the response, and then redirect to the jsp.</p> <p>On the other hand the exception type thrown by the JSP page is org.apache.jasper.JasperException, and not NumberFormatException, the apache jasper JSP engine is catching the number format exception, and throwing a JasperException to Tomcat. </p> <p>Also, clear your tomcat cache to ensure that your JSP is being deployed to the last version, in order to do so, delete the following folders and files (including war):<br> {tomcat installation path}\work\Catalina\localhost(your app)<br> {tomcat installation path}\webapps(your app)</p> <p>It should work if you catch the generic java.lang.Exception.</p> <p>Also try this:</p> <hr> <pre><code> final double MA_TO_A = 0.001; int Svolt = 0; double Amperes = 0.0; double LEDdrop = 0.0; try { if (request.getParameter("Svolt") != null) { try { Svolt = Integer.parseInt(request.getParameter("Svolt")); } catch (Exception e) { //Changed to avoid the message if no exception, or for some other reason it fails to execute the conditions out.println("&lt;script type =\"text/javascript\"&gt;") out.println("alert(\"The source voltage must be an integer. Please fix this.\");") ; out.println("&lt;/script&gt;") } Amperes = Double.parseDouble(request.getParameter("Amperes")); LEDdrop = Double.parseDouble(request.getParameter("LEDdrop")); out.println("Ideal resistance is: " + ((Svolt - LEDdrop) / (Amperes * MA_TO_A)) + " Ohms."); } } catch (Exception e) { out.println("Please make sure your inputs are correct."); } </code></pre>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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