Java Servlet: getInitParameter not work in Service()
- by Gabriele
I've added some parameters in my web.xml config file, as follow:
<context-param>
<param-name>service1</param-name>
<param-value>http://www.example.com/example2.html</param-value>
</context-param>
<context-param>
<param-name>service2</param-name>
<param-value>http://www.example.com/example2.html</param-value>
</context-param>
...
I try to get the parameter in my servlet, in particular in my service method:
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println(this.getServletContext().getInitParameter("service1"));
...
but at runtime I have a NullPointerException... How can I get the parameter value included in web.xml?
This is the stacktrace:
GRAVE: Servlet.service() for servlet DispatcherServlet threw exception
java.lang.NullPointerException
at javax.servlet.GenericServlet.getServletContext(GenericServlet.java:160)
at it.servlethope.DispatcherServlet.service(DispatcherServlet.java:66)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:176)
at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)
at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:381)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Unknown Source)
DispatcherServlet.java:66 is the line where I try the getInitParameter()
