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POWhat's wrong with my request.getParameter(abc)?
 

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  1. POWhat's wrong with my request.getParameter(abc)?
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    <p>I have a form which has a doPost:</p> <pre><code>&lt;form id="frmData" name="frmData" action="ProcessReg" method="post"&gt; &lt;td&gt;Full Name&lt;/td&gt; &lt;td&gt;&lt;input type="text" id="stFullName" name="stFullName" value=""&gt;&lt;/td&gt; </code></pre> <p>I am getting a HTTP 500 error and Tomcat log indicate the line that hit <code>request.getParameter</code> part as the problem.</p> <pre><code>java.lang.NullPointerException ProcessReg.processRequest(ProcessReg.java:86) ProcessReg.doPost(ProcessReg.java:32) javax.servlet.http.HttpServlet.service(HttpServlet.java:647) javax.servlet.http.HttpServlet.service(HttpServlet.java:728) </code></pre> <p>And my servlet:</p> <pre><code>public class ProcessReg extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); PrintWriter out = response.getWriter(); PreparedStatement ps = null; Connection con = null; ResultSet rs = null; Statement stmt = null; String strName = ""; strName = request.getParameter("stFullName"); try { DBConnect a = new DBConnect(); stmt = (Statement) DBConnect.getConnection(); rs = stmt.executeQuery("SELECT * FROM members"); </code></pre> <p>I hope someone can tells me what went wrong cos before it was working perfectly and I really am lost where is the error.</p> <p>Full stacktrace:</p> <pre><code>SEVERE: Servlet.service() for servlet [ProcessReg] in context with path [/Web1] threw exception java.lang.NullPointerException at ProcessReg.processRequest(ProcessReg.java:86) at ProcessReg.doPost(ProcessReg.java:32) at javax.servlet.http.HttpServlet.service(HttpServlet.java:647) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:619) </code></pre> <p>And my DBConnect.java :</p> <pre><code> public class DBConnect { private static Connection con; public static void createConnection(String dbUrl,String dbusername,String dbPassword){ try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); con = DriverManager.getConnection("jdbc:odbc:practODBC, 231, abc"); } catch (Exception ex) { } } public static Connection getConnection(){ return con; } public static void closeConnection(){ if(con!=null){ try { con.close(); } catch (SQLException ex) { } } </code></pre>
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    1. USKaren Goh
    1. USKaren Goh
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    1. COErrors is not with the line `strName = request.getParameter("stFullName");` ,it's some where else.Post full stacktrace.
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    2. COWhich is line 86?
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    3. COFull stacktrace posted.
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