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POServlet filters not working properly
 

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  1. POServlet filters not working properly
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    <p>I have a login.java servlet, from where after taking the username and password, if correct, we are directed to welcome.java servlet.A filter named loginfilter.java verifies the username and password. If the username and password are not correct, i have an errorpage.java servlet which is then called.</p> <p>My filter is not working which i dont know why. i think my web.xml code and filters code are correct. Plz help me find out the error. </p> <p>Here is the code for my filter</p> <pre><code>package filters; import java.io.IOException; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; public class loginfilter implements Filter{ @Override public void init(FilterConfig filterConfig) throws ServletException { throw new UnsupportedOperationException("Not supported yet."); } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain throws IOException, ServletException { String u=request.getParameter("username"); String p=request.getParameter("password"); String user="akshay"; String pass="akshay"; if (u.equals(user) &amp;&amp; p.equals(pass)){ chain.doFilter(request,response); } } @Override public void destroy() { throw new UnsupportedOperationException("Not supported yet."); } private RequestDispatcher getReuestDispatcher(String loginpage) { throw new UnsupportedOperationException("Not supported yet."); } } </code></pre> <p>Here is the code for web.xml:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;servlet&gt; &lt;servlet-name&gt;login&lt;/servlet-name&gt; &lt;servlet-class&gt;login&lt;/servlet-class&gt; &lt;/servlet&gt; &lt;servlet&gt; &lt;servlet-name&gt;welcomepage&lt;/servlet-name&gt; &lt;servlet-class&gt;welcomepage&lt;/servlet-class&gt; &lt;/servlet&gt; &lt;servlet&gt; &lt;servlet-name&gt;errorpage&lt;/servlet-name&gt; &lt;servlet-class&gt;errorpage&lt;/servlet-class&gt; &lt;/servlet&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;login&lt;/servlet-name&gt; &lt;url-pattern&gt;/login&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; &lt;error-page&gt; &lt;error-code&gt;404&lt;/error-code&gt; &lt;location&gt;/errorpage&lt;/location&gt; &lt;/error-page&gt; &lt;error-page&gt; &lt;error-code&gt;403&lt;/error-code&gt; &lt;location&gt;/errorpage&lt;/location&gt; &lt;/error-page&gt; &lt;error-page&gt; &lt;exception-type&gt;javax.servlet.ServletException&lt;/exception-type&gt; &lt;location&gt;/errorpage&lt;/location&gt; &lt;/error-page&gt; &lt;error-page&gt; &lt;exception-type&gt;javax.io.IOException&lt;/exception-type&gt; &lt;location&gt;/errorpage&lt;/location&gt; &lt;/error-page&gt; &lt;filter&gt; &lt;filter-name&gt;loginfilter&lt;/filter-name&gt; &lt;filter-class&gt;filters.loginfilter&lt;/filter-class&gt; &lt;/filter&gt; &lt;filter-mapping&gt; &lt;filter-name&gt;loginfilter&lt;/filter-name&gt; &lt;servlet-name&gt;welcomepage&lt;/servlet-name&gt; &lt;/filter-mapping&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;welcomepage&lt;/servlet-name&gt; &lt;url-pattern&gt;/welcomepage&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;errorpage&lt;/servlet-name&gt; &lt;url-pattern&gt;/errorpage&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; &lt;session-config&gt; &lt;session-timeout&gt; 30 &lt;/session-timeout&gt; &lt;/session-config&gt; &lt;/web-app&gt; </code></pre>
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    1. USSotirios Delimanolis
    1. USAkshay
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    1. This table or related slice is empty.
    1. COnot working is not an appropriate description of any issue. Tell us exactly what is the problem. How is it not working?
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      1. POServlet filters not working properly
      1. USRohit Jain
    2. CO`request.getParameter()` returns null if there is no such parameter. You will get an NPE in your case.
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      1. POServlet filters not working properly
      1. USSotirios Delimanolis
    3. COFilter not calling ?? or Code in filter behaving not as expected ??
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      1. POServlet filters not working properly
      1. USꜱᴜʀᴇꜱʜ ᴀᴛᴛᴀ
 

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