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POUsing Jena Api in Java Web... Unknown Exception
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  1. POUsing Jena Api in Java Web... Unknown Exception
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    copied!<p>Did anyone encountered this exception while using Jena in Java Web Application... Please Kindly help me ..</p> <p>Here is my servlet code</p> <pre><code>package com.mycompany.servlet; import java.io.IOException; import java.util.Iterator; import javax.servlet.RequestDispatcher; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.hp.hpl.jena.query.QueryExecution; import com.hp.hpl.jena.query.QueryExecutionFactory; import com.hp.hpl.jena.query.QueryFactory; import com.hp.hpl.jena.query.ResultSet; import com.hp.hpl.jena.rdf.model.ModelFactory; import com.hp.hpl.jena.ontology.*; /** * Servlet implementation class GreetingServlet */ @WebServlet("/GreetingServlet") public class GreetingServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public GreetingServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub String SOURCE ="file:E:\\healthcare.owl"; OntModel base = ModelFactory.createOntologyModel( OntModelSpec.OWL_MEM ); base.read( SOURCE ); for (Iterator&lt;OntClass&gt; i = base.listClasses(); i.hasNext(); ) { OntClass c = i.next(); //System.out.println( "Class" + c.getLocalName()); } } } </code></pre> <p>Exception is HTTP Status 500 - </p> <hr> <p>type Exception report</p> <p>message </p> <pre><code>description The server encountered an internal error () that prevented it from fulfilling this request. </code></pre> <p>exception </p> <pre><code>javax.servlet.ServletException: Error instantiating servlet class com.mycompany.servlet.GreetingServlet org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:498) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:394) org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243) org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188) org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166) org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302) java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) java.lang.Thread.run(Unknown Source) </code></pre> <p>root cause </p> <pre><code>java.lang.NoClassDefFoundError: com/hp/hpl/jena/rdf/model/Model java.lang.Class.getDeclaredConstructors0(Native Method) java.lang.Class.privateGetDeclaredConstructors(Unknown Source) java.lang.Class.getConstructor0(Unknown Source) java.lang.Class.newInstance0(Unknown Source) java.lang.Class.newInstance(Unknown Source) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:498) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:394) org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243) org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188) org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166) org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302) java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) java.lang.Thread.run(Unknown Source) </code></pre> <p>root cause </p> <pre><code>java.lang.ClassNotFoundException: com.hp.hpl.jena.rdf.model.Model org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1676) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1521) java.lang.Class.getDeclaredConstructors0(Native Method) java.lang.Class.privateGetDeclaredConstructors(Unknown Source) java.lang.Class.getConstructor0(Unknown Source) java.lang.Class.newInstance0(Unknown Source) java.lang.Class.newInstance(Unknown Source) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:498) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:394) org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243) org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188) org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166) org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302) java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) java.lang.Thread.run(Unknown Source) </code></pre> <p>note The full stack trace of the root cause is available in the Apache Tomcat/7.0.11 logs.</p> <hr>
 

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