Develop Reference

Can't change mappedfile to false in Apache Tomcat 8.5

I'm trying to run a Java Webb Application using Apache Tomcat 8.5 through my Netbeans IDE. However, one of the functions in the jsp files has a large file size that exceeds the 65535 byte limit for Tomcat.
To combat this, I tried going into Tomcat's web.xml file and changing the mappedfile param value to false, as seen below.
<servlet>
<servlet-name>jsp</servlet-name>
<servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
<init-param>
<param-name>fork</param-name>
<param-value>false</param-value>
</init-param>
<init-param>
<param-name>xpoweredBy</param-name>
<param-value>false</param-value>
</init-param>
<init-param>
<param-name>mappedfile</param-name>
<param-value>false</param-value>
</init-param>
<load-on-startup>3</load-on-startup>
</servlet>
However, when I restarted the server and ran the program again, the error persisted. Confused, I checked the web.xml file again, only to find that the mappedfile param had gone back to true. As seen below.
<servlet>
<servlet-name>jsp</servlet-name>
<servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
<init-param>
<param-name>fork</param-name>
<param-value>false</param-value>
</init-param>
<init-param>
<param-name>xpoweredBy</param-name>
<param-value>false</param-value>
</init-param>
<init-param>
<param-name>mappedfile</param-name>
<param-value>true</param-value>
</init-param>
<load-on-startup>3</load-on-startup>
</servlet>
I tried over and over again, and every time the value keeps reverting back to true when I start up the server again. I couldn't find anybody else talking about this error when I looked it up, so I'm not sure how to fix this. What should I do to make sure it stays false?
EDIT:
This is the error i'm getting when I try to run it in its current state.
An error occurred at line: [237] in the generated java file: [C:\Program Files\Apache Software Foundation\Tomcat 8.5\work\Catalina\localhost\vendor-portal\org\apache\jsp\WEB_002dINF\views\SAA\AddNewSaaForm_jsp.java]
The code of method _jspService(HttpServletRequest, HttpServletResponse) is exceeding the 65535 bytes limit
Stacktrace:]
org.apache.jasper.JasperException: Unable to compile class for JSP:
An error occurred at line: [237] in the generated java file: [C:\Program Files\Apache Software Foundation\Tomcat 8.5\work\Catalina\localhost\vendor-portal\org\apache\jsp\WEB_002dINF\views\SAA\AddNewSaaForm_jsp.java]
The code of method _jspService(HttpServletRequest, HttpServletResponse) is exceeding the 65535 bytes limit
Stacktrace:
at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:102)
at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:213)
at org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:556)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:380)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:350)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:334)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:597)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:398)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:383)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:331)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:232)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:167)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:194)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:167)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:712)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:462)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:388)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:316)
at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:236)
at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:257)
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1183)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:902)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:807)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:501)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:655)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:232)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:167)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:194)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:167)
at com.hbc.vp.context.LoginFilter.doFilter(LoginFilter.java:107)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:236)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:194)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:167)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:194)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:167)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:544)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:698)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:364)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:624)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:831)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1651)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)

RESTful API - Getting HTTP 500 error all the time

I am making a simple RESTful API to my application. I've made another package in my project (other from one where is my main java class, servlet, and model). And then I've made my resource file, very simple which looks like this:
package com.java.api;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.core.Response;
#Path("webservice")
public class ZipcodeService {
#GET
#Path("/lookup")
public Response lookup() {
return Response.ok().entity("Los Angeles").build();
}
}
and this is my web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" id="WebApp_ID"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<display-name>parking-space-booking-system</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>Jersey Web Application</servlet-name>
<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>jersey.config.server.provider.packages</param-name>
<param-value>com.java.api</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Jersey Web Application</servlet-name>
<url-pattern>/webservice/*</url-pattern>
</servlet-mapping>
</web-app>
I am not using Maven. I am using Netbeans IDE and Tomcat server. I uploaded Jersey 2.25 all jar files to WEB-INF/lib folder. I am experimenting with web.xml to fix it but I have no more ideas. Here is the structure of my project:
Here is also my error message I got:
HTTP Status 500 - Servlet.init() for servlet Jersey Web Application threw exception
type Exception report
message Servlet.init() for servlet Jersey Web Application threw an exception
description The server encountered an internal error that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Servlet.init() for servlet Jersey Web Application threw exception
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.lang.Thread.run(Thread.java:748)
root cause
java.lang.NoSuchMethodError: org.glassfish.jersey.CommonProperties.getValue(Ljava/util/Map;Ljavax/ws/rs/RuntimeType;Ljava/lang/String;Ljava/lang/Object;Ljava/lang/Class;)Ljava/lang/Object;
org.glassfish.jersey.jackson.JacksonFeature.configure(JacksonFeature.java:69)
org.glassfish.jersey.model.internal.CommonConfig.configureFeatures(CommonConfig.java:674)
org.glassfish.jersey.model.internal.CommonConfig.configureMetaProviders(CommonConfig.java:610)
org.glassfish.jersey.server.ResourceConfig.configureMetaProviders(ResourceConfig.java:800)
org.glassfish.jersey.server.ApplicationHandler.initialize(ApplicationHandler.java:367)
org.glassfish.jersey.server.ApplicationHandler.access$500(ApplicationHandler.java:162)
org.glassfish.jersey.server.ApplicationHandler$3.run(ApplicationHandler.java:304)
org.glassfish.jersey.internal.Errors$2.call(Errors.java:289)
org.glassfish.jersey.internal.Errors$2.call(Errors.java:286)
org.glassfish.jersey.internal.Errors.process(Errors.java:315)
org.glassfish.jersey.internal.Errors.process(Errors.java:297)
org.glassfish.jersey.internal.Errors.processWithException(Errors.java:286)
org.glassfish.jersey.server.ApplicationHandler.(ApplicationHandler.java:301)
org.glassfish.jersey.servlet.WebComponent.(WebComponent.java:311)
org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:169)
org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:359)
javax.servlet.GenericServlet.init(GenericServlet.java:158)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.lang.Thread.run(Thread.java:748)
note The full stack trace of the root cause is available in the Apache Tomcat/8.0.27 logs.
Apache Tomcat/8.0.27

Perhaps you have problems with your libraries.
root cause
java.lang.NoSuchMethodError: org.glassfish.jersey.CommonProperties.getValue(..
by the server initialisation shows that you forgot to add some library (perhaps it's not in your Jersey 2.25, check for it). Your can also try to use another version of Jersey.

You need to look in (and post) your Tomcat logs. Look at catalina.out. It looks to me like your web.xml doesn't have a closing web-app tag, but that might just be because you didn't post the full web.xml.
Also, you need to package your application as a WAR file. Tomcat expects your web application WAR file to be located under the webapps directory.
edit:
the method wasn't found, therefore the appropriate JAR isn't actually on the classpath (lib folder).
org.glassfish.jersey.CommonProperties.getValue

Tomcat Deploy .war file doesn't run

I'm trying to deploy my .war file from Tomcat 8 with Ja, for running it in Postman. However, when I try to deploy and it is not shown in Postman. Below are the given exceptions that causes this issue. What can i do to solve this problem?
org.apache.catalina.startup.HostConfig.deployWAR Deploying web application archive [C:\Users\berkt\eclipse-workspace\Test\apache-tomcat-8.5.32\webapps\Restful.war]
04-Jul-2018 14:08:31.081 INFO [localhost-startStop-1] org.apache.catalina.startup.ContextConfig.processServletContainerInitializers Unable to process ServletContainerInitializer for [org.glassfish.jersey.servlet.init.JerseyServletContainerInitializer]. This is most likely due to a class defined in the #HandlesTypes annotation being missing. Enable DEBUG level logging for the full stack trace.
04-Jul-2018 14:08:31.541 SEVERE [localhost-startStop-1] org.apache.catalina.core.ContainerBase.addChildInternal ContainerBase.addChild: start:
org.apache.catalina.LifecycleException: Failed to start component
[StandardEngine[Catalina].StandardHost[localhost].StandardContext[/Restful]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:754)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:730)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:985)
at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1857)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Also, i'm using this xml file:
<?xml version = "1.0" encoding = "UTF-8"?>
<web-app xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
xmlns = "http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id = "WebApp_ID" version = "3.0">
<display-name>User Management</display-name>
<servlet>
<servlet-name>Jersey RESTful Application</servlet-name>
<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>jersey.config.server.provider.packages</param-name>
<param-value>TestRestful</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>Jersey RESTful Application</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>

Probleme with my Servlet and #FormDataParam Jersey

I have a problem with my web-services using Jersey. I have a form composed of two inputs, one of type "file" and one of type "text".
The problem is that when I only use the input of type "file", everything works fine, but when I add the second one, of type "text", my servlet can't even start properly.
Here is the exception I have when I start my servlet :
avr. 28, 2015 5:16:17 PM org.apache.catalina.core.StandardContext loadOnStartup
GRAVE: La servlet /SemRecSysWS a généré une exception "load()"
org.glassfish.jersey.server.model.ModelValidationException: Validation of the application resource model has failed during application initialization.
[[FATAL] No injection source found for a parameter of type public java.lang.String fr.checksem.semrecsys.Gestion.insertSKOS(java.io.InputStream,org.openrdf.rio.RDFFormat) at index 0.; source='ResourceMethod{httpMethod=POST, consumedTypes=[multipart/form-data], producedTypes=[text/plain; charset=utf-8], suspended=false, suspendTimeout=0, suspendTimeoutUnit=MILLISECONDS, invocable=Invocable{handler=ClassBasedMethodHandler{handlerClass=class fr.checksem.semrecsys.Gestion, handlerConstructors=[org.glassfish.jersey.server.model.HandlerConstructor#1a533161]}, definitionMethod=public java.lang.String fr.checksem.semrecsys.Gestion.insertSKOS(java.io.InputStream,org.openrdf.rio.RDFFormat), parameters=[Parameter [type=class java.io.InputStream, source=fichier, defaultValue=null], Parameter [type=class org.openrdf.rio.RDFFormat, source=Format, defaultValue=null]], responseType=class java.lang.String}, nameBindings=[]}']
at org.glassfish.jersey.server.ApplicationHandler.initialize(ApplicationHandler.java:500)
at org.glassfish.jersey.server.ApplicationHandler.access$500(ApplicationHandler.java:167)
at org.glassfish.jersey.server.ApplicationHandler$3.run(ApplicationHandler.java:327)
at org.glassfish.jersey.internal.Errors$2.call(Errors.java:289)
at org.glassfish.jersey.internal.Errors$2.call(Errors.java:286)
at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
at org.glassfish.jersey.internal.Errors.processWithException(Errors.java:286)
at org.glassfish.jersey.server.ApplicationHandler.<init>(ApplicationHandler.java:324)
at org.glassfish.jersey.servlet.WebComponent.<init>(WebComponent.java:315)
at org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:170)
at org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:358)
at javax.servlet.GenericServlet.init(GenericServlet.java:160)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1280)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1193)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1088)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5176)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5460)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3954)
at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:426)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1345)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1530)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1540)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1540)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1519)
at java.lang.Thread.run(Unknown Source)
Here is the function where I try to access to the file and the text
#POST
#Path("/initSKOS")
#Consumes(MediaType.MULTIPART_FORM_DATA)
#Produces(MediaType.TEXT_PLAIN + ";charset=utf-8")
public String insertSKOS(#FormDataParam("fichier") InputStream uploadedInputStream, #FormDataParam("Format") RDFFormat format) {
....
}
I have tried with every type for my variable format, but that doesn't change anything.
And here is my web.xml file :
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="SemRecSysWS" version="3.0">
<display-name>RecWS</display-name>
<servlet>
<servlet-name>fr.checksem.semrecsys.TestWS</servlet-name>
<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>jersey.config.server.provider.packages</param-name>
<param-value>fr.checksem.semrecsys</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>fr.checksem.semrecsys.TestWS</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>
I don't know if you completely understood my problem, I tried to be as clear as possible.
Thanks in advance

You need to register the MultiPartFeature in your web.xml. You can simply add an <init-param> to the Jersey servlet
<init-param>
<param-name>jersey.config.server.provider.classnames</param-name>
<param-value>org.glassfish.jersey.media.multipart.MultiPartFeature</param-value>
</init-param>
See explanation of problem here
See other configuring options here

HTTP Status 500 - Error instantiating servlet class java.reg.pkg.Hello [duplicate]

This question already has answers here:
Servlet returns "HTTP Status 404 The requested resource (/servlet) is not available"
(19 answers)
Closed 6 years ago.
I am trying to execute a servlet program in eclipse, but i am getting an HTTP status 500 error.
Please find my directory structure:
Practice_servlet
|
Java Resources
|
src
|
javs.reg.pkg
|
Hello.java
My web.xml is:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>Practice1_servlet</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>Hello1</servlet-name>
<servlet-class>java.reg.pkg.Hello</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Hello1</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping>
</web-app>
My hello.java program is:
package java.reg.pkg;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class Hello
*/
public class Hello extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* #see HttpServlet#HttpServlet()
*/
public Hello() {
super();
// TODO Auto-generated constructor stub
}
/**
* #see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("type/html");
PrintWriter out = response.getWriter();
out.println("Hello World");
// TODO Auto-generated method stub
}
}
Any idea of what the problem could be ?
Stack trace for the above program:
HTTP Status 500 - Error instantiating servlet class java.reg.pkg.Hello
type Exception report
message Error instantiating servlet class java.reg.pkg.Hello
description The server encountered an internal error that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Error instantiating servlet class
java.reg.pkg.Hello
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313)
java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.lang.Thread.run(Unknown Source)
root cause
java.lang.ClassNotFoundException: java.reg.pkg.Hello
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1718)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1569)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313)
java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.lang.Thread.run(Unknown Source)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.52 logs.
I am using Apache Tomcat/7.0.52.

Try cleaning the project and run. If you are using eclipse Project -> Clean

I think there is a wrong name there. Your servlet is called Hello and is in java.reg.pkg, while the stack trace says it is instructed to load a servlet called SampleHello within the java.sample.pkg package.
The web.xml you provided has no trace of the latter servlet, hence the ClassNotFoundException error...