Chetan Dodiya

anyone knows this???
please do reply.....

Hurray!!! now its working thanks alot Vijitha

i changed my web.xml file to

<?xml version="1.0" encoding="ISO-8859-1"?> <!-- Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. --> <web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4"> <display-name>Welcome to Tomcat</display-name> <description> Welcome to Tomcat </description> <!-- JSPC servlet mappings start --> <servlet> <servlet-name>Chapter1 Servlet</servlet-name> <servlet-class>ch1Servlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>Chapter1 Servlet</servlet-name> <url-pattern>/Serv1</url-pattern> </servlet-mapping> <!-- JSPC servlet mappings end --> </web-app>

and I am starting my tomcat with http://localhost:8080
tomcat starts successfully shows its index page accurately....

when i startup my tomcat through command prompt it displays like...

Jan 7, 2009 2:09:55 PM org.apache.catalina.core.AprLifecycleListener lifecycleEv
ent
INFO: The Apache Tomcat Native library which allows optimal performance in produ
ction environments was not found on the java.library.path: D:\Java\jdk1.5.0_06\b
in;.;D:\WINDOWS\system32;D:\WINDOWS;D:\Java\jdk1.5.0_06\bin;D:\Java\JSDK2.0\bin
Jan 7, 2009 2:09:55 PM org.apache.coyote.http11.Http11BaseProtocol init
INFO: Initializing Coyote HTTP/1.1 on http-8080
Jan 7, 2009 2:09:55 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 2172 ms
Jan 7, 2009 2:09:56 PM org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
Jan 7, 2009 2:09:56 PM org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/5.5.27
Jan 7, 2009 2:09:56 PM org.apache.catalina.core.StandardHost start
INFO: XML validation disabled
Jan 7, 2009 2:09:59 PM org.apache.coyote.http11.Http11BaseProtocol start
INFO: Starting Coyote HTTP/1.1 on http-8080
Jan 7, 2009 2:10:00 PM org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
Jan 7, 2009 2:10:00 PM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/484 config=null
Jan 7, 2009 2:10:00 PM org.apache.catalina.storeconfig.StoreLoader load
INFO: Find registry server-registry.xml at classpath resource
Jan 7, 2009 2:10:01 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 5281 ms


and in book it sugests that start as http://localhost/ch1/Serv1 and when i hit enter it shows


HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Error instantiating servlet class ch1Servlet
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
java.lang.Thread.run(Thread.java:595)
root cause

java.lang.IllegalAccessException: Class org.apache.catalina.core.StandardWrapper can not access a member of class ch1Servlet with modifiers ""
sun.reflect.Reflection.ensureMemberAccess(Reflection.java:65)
java.lang.Class.newInstance0(Class.java:344)
java.lang.Class.newInstance(Class.java:303)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
java.lang.Thread.run(Thread.java:595)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.27 logs.

this the output of prompt which shows the many errors when i startup Tomcat..

Jan 7, 2009 1:44:52 PM org.apache.catalina.core.AprLifecycleListener lifecyc
ent
INFO: The Apache Tomcat Native library which allows optimal performance in p
ction environments was not found on the java.library.path: D:\Java\jdk1.5.0_
in;.;D:\WINDOWS\system32;D:\WINDOWS;D:\Java\jdk1.5.0_06\bin;D:\Java\JSDK2.0\
Jan 7, 2009 1:44:52 PM org.apache.coyote.http11.Http11BaseProtocol init
INFO: Initializing Coyote HTTP/1.1 on http-8080
Jan 7, 2009 1:44:53 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 2313 ms
Jan 7, 2009 1:44:53 PM org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
Jan 7, 2009 1:44:53 PM org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/5.5.27
Jan 7, 2009 1:44:53 PM org.apache.catalina.core.StandardHost start
INFO: XML validation disabled
Jan 7, 2009 1:44:55 PM org.apache.catalina.startup.ContextConfig application
onfig
SEVERE: Parse error in application web.xml file at jndi:/localhost/ch1/WEB-I
eb.xml
java.io.UnsupportedEncodingException: ISO-8851-1
at sun.io.Converters.getConverterClass(Converters.java:218)
at sun.io.Converters.newConverter(Converters.java:251)
at sun.io.ByteToCharConverter.getConverter(ByteToCharConverter.java:
at sun.nio.cs.StreamDecoder$ConverterSD.<init>(StreamDecoder.java:22
at sun.nio.cs.StreamDecoder$ConverterSD.<init>(StreamDecoder.java:21
at sun.nio.cs.StreamDecoder.forInputStreamReader(StreamDecoder.java:
at java.io.InputStreamReader.<init>(InputStreamReader.java:83)
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.createRe
(XMLEntityManager.java:2012)
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager$ScannedE
y.setReader(XMLEntityManager.java:2455)
at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.setEncod
XMLEntityScanner.java:188)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScanne
l.scanXMLDeclOrTextDecl(XMLDocumentFragmentScannerImpl.java:734)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$XM
lDispatcher.dispatch(XMLDocumentScannerImpl.java:721)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScanne
l.scanDocument(XMLDocumentFragmentScannerImpl.java:368)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.par
ML11Configuration.java:834)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.par
ML11Configuration.java:764)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLPar
java:148)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.pars
stractSAXParser.java:1242)
at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1562
at org.apache.catalina.startup.ContextConfig.applicationWebConfig(Co
tConfig.java:348)
at org.apache.catalina.startup.ContextConfig.start(ContextConfig.jav
48)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextC
g.java:261)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Life
eSupport.java:120)
at org.apache.catalina.core.StandardContext.start(StandardContext.ja
148)
at org.apache.catalina.core.ContainerBase.addChildInternal(Container
.java:760)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.jav
0)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:

at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig
a:927)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConf
ava:890)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java
)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1150
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.
:311)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Life
eSupport.java:120)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1

at org.apache.catalina.core.StandardHost.start(StandardHost.java:736
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1

at org.apache.catalina.core.StandardEngine.start(StandardEngine.java
)
at org.apache.catalina.core.StandardService.start(StandardService.ja
48)
at org.apache.catalina.core.StandardServer.start(StandardServer.java
)
at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorI
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodA
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
Jan 7, 2009 1:44:56 PM org.apache.catalina.startup.ContextConfig start
SEVERE: Marking this application unavailable due to previous error(s)
Jan 7, 2009 1:44:56 PM org.apache.catalina.core.StandardContext start
SEVERE: Error getConfigured
Jan 7, 2009 1:44:56 PM org.apache.catalina.core.StandardContext start
SEVERE: Context [/ch1] startup failed due to previous errors
Jan 7, 2009 1:44:57 PM org.apache.coyote.http11.Http11BaseProtocol start
INFO: Starting Coyote HTTP/1.1 on http-8080
Jan 7, 2009 1:44:58 PM org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
Jan 7, 2009 1:45:01 PM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/3016 config=null
Jan 7, 2009 1:45:01 PM org.apache.catalina.storeconfig.StoreLoader load
INFO: Find registry server-registry.xml at classpath resource
Jan 7, 2009 1:45:01 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 8859 ms

Yes...
I am done the same thing as you suggested.....

starting with

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns: xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/web-app_2_4.xsd"
version="2.4">


and ends with

</web-app>

but I am still facing the same problem...

yes....
I am able to access indiex page correctly...
I am accessing index page using http://localhost:8080
and i forget to tell you that my servlet-api.jar file is in the

tomcat/common/lib folder
and I am new to servlet so I am following as per the suggested in the book...
you can suggest me where should I put my files....
and one more thing....
when I starts tomcat through command prompt, tomcat starts with lots of error in the

command prompt stating that errors in the ch1 folder which is in the tomcat/webapps folder...

my ch1Servlet file is below and its .class file is in the tomcat/webapps/ch1/WEB-INF/classes folder...

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

class ch1Servlet extends HttpServlet{
public void doGet(HttpServletRequest request,HttpServletResponse response)throws IOException{
PrintWriter out=response.getWriter();
java.util.Date today=new java.util.Date();
out.println("<html>"+
"<body>"+
"<h1 align=center>HF\'s Chapter1 Servlet</h1>"+
+ today +"</body>"+"</html>");
}
}

and its .xml file is below and it is in the tomcat/webapps/ch1/WEB-INF folder...

<?xml version="1.0" encoding="ISO-8851-1" ?>
<web-apps xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns: xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/web-app_2_4.xsd"
version="2.4">
<servlet>
<servlet-name>Chapter1 Servlet</servlet-name>
<servlet-class>ch1Servlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>Chapter1 Servlet</servlet-name>
<url-pattern>/Serv1</url-pattern>
</servlet-mapping>
</web-apps>


and my tomcat starts perfectly......

hi...
I am new to servlet....
when I am try to run servlet in my browser it gives error HTTP status 404

my setting is:

path=D:\Java\jdk1.5.0_06\bin;D:\Java\JSDK2.0\bin
classpath=D:\Java\jdk1.5.0_06\lib\tools.jar;D:\Java\JSDK2.0\lib\jsdk.jar
java_home=D:\Java\jdk1.5.0_06
tomcat_home=D:\Java\tomcat

and the problem I am trying to run is given in HF S&J pg. no.- 30...
I done as per stated in the book but while I am trying to run the servlet it gives the same problem again again...
my web.xml and ch1Servlet are correct....
please help me to sortout this problem....

this q is from ExamLab
public class Fex2{ public static void main(String args[]){ byte b1=12; Byte B1=new Byte(b1); short s1=6; Short S1=new Short(s1); int i1=7; Integer I1=new Integer(i1); Long l1=new Long(45L); Number nm=new Short("4"); capture(b1); capture(B1); //...1 capture(s1); capture(s1+=20000); capture(S1); capture(nm); capture(I1.intValue()); capture(Short.valueOf("110110",2)); capture(Short.parseShort("110110",2)); capture(); } static void capture(short x){ System.out.print("A"); } static void capture(int x){ System.out.print("B"); } static void capture(long x){ System.out.print("C"); } static void capture(Short x){ System.out.print("D"); } static void capture(Integer x){ System.out.print("E"); } static void capture(Long... x){ System.out.print("F"); } static void capture(Number x){ System.out.print("G"); } }


OUTPUT IS
AGAADGBDAF

why in this program wrapper Byte is widen to Number
because Wrapper type cant widen...
so why this program works fine???

hey thanks...
i was little bit confused between volatile and transient modifier while doing practice....

No one knows the answer of this Question???

thanks for the explanation...

This q is from ExamLab
import java.util.Formatter; class Format1{ public static void main(String[] args){ System.out.printf("45%2$b%3$+04d",978,654,321,111); } }

why the output is"45true+321"
because second argument is not of boolean type???

thank you very much....
[ November 14, 2008: Message edited by: Chetan dodiya ]

if

class Animal{ void doStuff(){} } class Dog extends Animal{ void doStuff(){} public static void main(String[] args){ Animal a=new Dog(); a.doStuff(); //...1 Dog d=(Dog)a; d.doStuff(); //...2 ((Dog)a).doStuff(); //..3 } }

at line 1 2 & 3 which methods are called means Dog's class And Animal's class???