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PODifference between 2 dates throws java.lang.NullPointerException
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  1. PODifference between 2 dates throws java.lang.NullPointerException
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    copied!<p>I am new to JSP and I need help for calculating difference between 2 dates in seconds, which gets the date input from a form in the "yyyy-MM-dd" format. But while I compile it I get the error. Please help me in correcting it.</p> <h1>Error:</h1> <pre><code>java.lang.NullPointerException at java.text.SimpleDateFormat.parse(SimpleDateFormat.java:1380) at java.text.DateFormat.parse(DateFormat.java:355) at org.apache.jsp.datediff2_jsp._jspService(datediff2_jsp.java:105) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) 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:472) 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:947) 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:1009) 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.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:722) </code></pre> <h1> My code is as follows:</h1> <pre><code>&lt;%@ page language ="java" import="java.sql.*,java.text.SimpleDateFormat, java.util.Date,java.text.*, java.util.Calendar" %&gt; &lt;html&gt; &lt;body bgcolor="pink"&gt; &lt;form method="post"&gt; &lt;input name="T1" value="2013-07-01"/&gt; &lt;input name="T2" value="2013-07-31"/&gt; &lt;input type="submit" value="Submit" name="B1"&gt; &lt;/form&gt; &lt;% String dStart = request.getParameter("T1"); String dStop = request.getParameter("T2"); SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); Date d1 = null; Date d2 = null; try { d1 = format.parse(dStart); d2 = format.parse(dStop); out.print(d1); long difference = d2.getTime() - d1.getTime(); long seconds = difference / 1000; out.print(seconds); } catch (Exception e) { e.printStackTrace(); } %&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
 

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