Discussion :

[ridazero]

bonjour je voudrais savoir la cause de cette exception

Etat HTTP 500 - Erreur à l'instantiation de la classe servlet com.servlet.test.InvokeJsp



javax.servlet.ServletException: Erreur à l'instantiation de la classe servlet com.servlet.test.InvokeJsp
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.lang.Thread.run(Unknown Source)
cause mère

java.lang.ClassNotFoundException: com.servlet.test.InvokeJsp
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.lang.Thread.run(Unknown Source)

[zikyoubi]

Erreur dans le chemin de la class

[tchize_]

java.lang.ClassNotFoundException: com.servlet.test.InvokeJsp

La cause est que cette classe manque à l'appel dans ton application.

[ridazero]

pour le fichier web.xml

<web-app>
<servlet>
<servlet-class>com.servlet.test.DoIt</servlet-class>
<servlet-name>firstServlet</servlet-name>
</servlet>
<servlet>
<servlet-class>com.servlet.test.InvokeJsp</servlet-class>
<servlet-name>invoke</servlet-name>
</servlet>
<servlet-mapping>
<servlet-name>firstServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>invoke</servlet-name>
<url-pattern>/invoke</url-pattern>
</servlet-mapping>
</web-app>

pour la classe InvokeJsp

package com.servlet.test;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class InvokeJsp extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse
response)
throws IOException, ServletException{
RequestDispatcher dispatch =
request.getRequestDispatcher("firstjsp.jsp");
dispatch.forward(request, response);
}
}

url : http://localhost:8080/test/invoke