0 Replies Latest reply on Mar 14, 2008 11:51 AM by Ken Hamilton

    Creating a servlet

    Ken Hamilton Newbie

      I have a JBoss Seam project already in place, and I'm trying to add a service that will return a PDF from a URL request. It's my understanding that to do that I will need to modify the HTTP response, and to do that I need a component that extends HTTPServlet. I've tried to do that but I suspect that I'm missing some vital information. The code and error are below. If you read on, thank you, and prepare to be shocked by ignorance and apparently willful stupidity. But that's why I posted it in the Beginner's Corner.

      The component code looks like this:

      @Name("printServer")
      @Stateless
      @Scope(ScopeType.PAGE)
      public class PrintServer extends HttpServlet implements IPrintServer {
      
       private static final long serialVersionUID = 1278807414184735439L;
      
       @Logger
       private static Log log;
      
       public String test(String message) {
       log.info("Running printing test method", "Arg = " + message);
      
       return "Printing test message = " + message;
       }
      }


      The interface code (do I even need to do that?) looks like this:
      @Remote
      public interface IPrintServer {
       public String test(String message);
      }


      The servlet mapping in web.xml looks like this:
      <servlet>
       <servlet-name>Print Servlet</servlet-name>
       <servlet-class>com.mckesson.hbi.services.PrintServer</servlet-class>
       <load-on-startup>2</load-on-startup>
       </servlet>
       <servlet-mapping>
       <servlet-name>Print Servlet</servlet-name>
       <url-pattern>/services/pdf/*</url-pattern>
       </servlet-mapping>
      


      The page I'm using it in looks like this:
      <!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
       "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
      <ui:composition xmlns="http://www.w3.org/1999/xhtml"
       xmlns:s="http://jboss.com/products/seam/taglib"
       xmlns:ui="http://java.sun.com/jsf/facelets"
       xmlns:f="http://java.sun.com/jsf/core"
       xmlns:h="http://java.sun.com/jsf/html"
       xmlns:rich="http://richfaces.org/rich"
       template="/layout/template.xhtml">
      
      <ui:define name="body">
      
       <h:messages globalOnly="true" styleClass="message"/>
      
       <rich:panel>
       <f:facet name="header">Printing test</f:facet>
       <div>Print: #{printServer.test("Hey Hey Kids")}</div>
       </rich:panel>
      
      </ui:define>
      </ui:composition>


      The error looks like this:
      SEVERE: Error Rendering View[/services/pdf/print.xhtml]
      javax.el.ELException: /services/pdf/print.xhtml: Could not instantiate Seam component: printServer
       at com.sun.facelets.compiler.TextInstruction.write(TextInstruction.java:50)
       at com.sun.facelets.compiler.UIInstructions.encodeBegin(UIInstructions.java:39)
       at org.ajax4jsf.renderkit.RendererBase.renderChild(RendererBase.java:280)
       at org.ajax4jsf.renderkit.RendererBase.renderChildren(RendererBase.java:262)
       at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:220)
       at org.richfaces.renderkit.html.PanelRenderer.doEncodeChildren(PanelRenderer.java:215)
       at org.ajax4jsf.renderkit.RendererBase.encodeChildren(RendererBase.java:121)
       at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:812)
       at javax.faces.component.UIComponent.encodeAll(UIComponent.java:886)
       at javax.faces.component.UIComponent.encodeAll(UIComponent.java:892)
       at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:592)
       at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:108)
       at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:216)
       at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
       at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
       at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
       at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
       at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
       at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
       at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
       at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:68)
       at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
       at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:85)
       at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
       at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
       at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
       at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:44)
       at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
       at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:143)
       at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:276)
       at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:60)
       at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
       at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58)
       at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
       at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
       at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
       at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
       at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
       at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
       at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
       at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
       at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
       at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
       at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
       at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
       at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
       at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
       at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
       at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
       at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
       at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
       at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
       at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
       at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
       at java.lang.Thread.run(Thread.java:595)
      Caused by: org.jboss.seam.InstantiationException: Could not instantiate Seam component: printServer
       at org.jboss.seam.Component.newInstance(Component.java:1962)
       at org.jboss.seam.Component.getInstance(Component.java:1865)
       at org.jboss.seam.Component.getInstance(Component.java:1832)
       at org.jboss.seam.Namespace.getComponentInstance(Namespace.java:55)
       at org.jboss.seam.Namespace.getComponentInstance(Namespace.java:50)
       at org.jboss.seam.el.SeamELResolver.resolveBase(SeamELResolver.java:166)
       at org.jboss.seam.el.SeamELResolver.getValue(SeamELResolver.java:53)
       at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53)
       at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:64)
       at org.jboss.el.parser.AstIdentifier.getValue(AstIdentifier.java:44)
       at org.jboss.el.parser.AstValue.getValue(AstValue.java:63)
       at org.jboss.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
       at com.sun.facelets.el.ELText$ELTextVariable.writeText(ELText.java:184)
       at com.sun.facelets.el.ELText$ELTextComposite.writeText(ELText.java:108)
       at com.sun.facelets.compiler.TextInstruction.write(TextInstruction.java:45)
       ... 54 more
      Caused by: javax.naming.NameNotFoundException: local not bound
       at org.jnp.server.NamingServer.getBinding(NamingServer.java:529)
       at org.jnp.server.NamingServer.getBinding(NamingServer.java:537)
       at org.jnp.server.NamingServer.getObject(NamingServer.java:543)
       at org.jnp.server.NamingServer.lookup(NamingServer.java:296)
       at org.jnp.server.NamingServer.lookup(NamingServer.java:270)
       at org.jnp.server.NamingServer.lookup(NamingServer.java:270)
       at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:667)
       at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:627)
       at javax.naming.InitialContext.lookup(InitialContext.java:351)
       at org.jboss.seam.Component.instantiateSessionBean(Component.java:1279)
       at org.jboss.seam.Component.instantiate(Component.java:1265)
       at org.jboss.seam.Component.newInstance(Component.java:1958)
       ... 68 more