HttpServlet

Slight problem with servlet code. JBuilder isnt recognising the HttpServlet class. javax seems to be imported correctly & the classpath setttings seem to be ok because JBuilder is recognising other classes & methods of the javax package. We're trying to extend the HttpServlet class & its here that the problem is showing up. Is there any way to get around this? Like I said the classpaths seem to be ok, no jar files but all the .java files in the package have been compiled & the class files are in the correct places.

May be javax.* package is not included into pull of JDK libs?
Go to Tools->Configure JDKs... and check whether javax.* package exists into your current JDK libs
(JBuilder 5)

Similar Messages

In which jar file is he HttpServlet Class ?

I've just downloaded J2SE 1.5. I haven't found a jar which contents classes such as HTTPServlet, HTTPSession, and so forth.
I guess it is part of the "Sun Java System Application Server Platform Edition 8.1 2005Q2 UR2", but I do not need all these stuffs, because I have already an Web application Server (Tomcat). I need only what it used to be called j2EE.jar.
Is it a way to download separalety from a location ?
Thanks
Gege

I've just downloaded J2SE 1.5. I haven't found a jar
which contents classes such as HTTPServlet,
HTTPSession, and so forth.It isn't there. It is part of J2EE (or now Java EE) not J2SE (or Java SE).
I guess it is part of the "Sun Java System
Application Server Platform Edition 8.1 2005Q2 UR2",Well, That server implements Java EE, so yeah...
but I do not need all these stuffs, Also correct.
because I have
already an Web application Server (Tomcat). I need
only what it used to be called j2EE.jar. It is called J2EE.jar in the J2EE reference implementation, and maybe some other servers.
Is it a way to download separalety from a location ?Don't need to. You already have it. Tomcat comes with a partial implementation of the Java EE spec. Depending on the version of Tomcat, it might be:
servlet.jar (Tomcat 4)
servlet-api.jar and jsp-api.jar (Tomcat 5)
If you plan on working with JSPs, custom tags, and the like, then adding the jsp-api.jar to the classpath (for Tomcat 5) will save some headaches later. But all the servlet stuff is in servlet.jar or servlet-api.jar.
>
>
Thanks
Gege

HttpServlet Client

Hi,ALL
This is a strange Question, please help me to figure it out.
I have a HttpServlet Aplication,
It will connect with Domino server to search database as CLIENT.
So, When It connect with Domino server.
I use Notes Cobra connection:
NotesFactory.createSession(....);
unluckly, it thorws me exception:
can't instantiate default ORB implementation lotus.priv.CORBA.iiop.ORB
If I create a pure application runing on windows platform.and use the same function:
NotesFactory.createSession(....);
it works fine.
why this problem happend if it is called under HttpServlet application?
Thanks

What I want to know:
if at the same time: cliend side both thread call
server.
or thread1 starts to call server, before thread1
ends call thread2 starts to call server again.
what will happen?
can I get right result?Each thread on the client side will have its own socket and each request on the server side will be relayed to its own socket, so there won't be no mix up in the transfer, if that is what you mean. The rest depends on how the server handles the requests.
>
and on server side:
what should I pay attention?You should pay attention to the fact that, on the server side, each request ought to be processed in a separate Thread, or else your server will never be able to process more than one request at a time, in which case your second request (on the client side) will block until the first one has been process, and so forth for each additional request.

Need a help about init action in HttpServlet

I provided a new class MServlet which extends HttpServlet.
I want to use the Mservlet class for my all servlets. My Mservlet must do some thiggs.
For example i have a class:
public class ListNews extends MServlet
So now i need some things would be done automaticaly. For example
response.setContentType("text/html;charset=windows-1257"); must be setted
that i do nor need to write this line in all servlets?
How i can do it?
If i am using public void init method in servlet and put there the string
response.setContentType("text/html;charset=windows-1257");
This does not work
Thanks

Just a minor switch with the previous post...
Use the MServlet to implement the doGet and doPost methods, make them final so that the subclasses can override them.
Provide a 'responseSetup' method that sets things that you want.
Provide your own 'doGetWork and doPostWork methods that the subclass overrides with its own stuff:
public MServlet extends HttpServlet {
public final void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
      responseSetup(response);
      doGetWork(request, response);
public final void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
      responseSetup(response);
      doPostWork(request, response);
//Default implementation does the same as HttpServlet.doGet()
public void doGetWork(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
      super.doGet(request,response);
//Default implementation does the same as HttpServlet.doPost()
public void doPostWork(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
      super.doPost(request,response);
//Do your init stuff here
private void responseSetup(HttpServletResponse response) {
      response.setContenType("text/html;charset=windows-1257");
}Then subclasses would use doGetWork and doPostWork like notmal HttpServlet subclasses would use doGet and doPost...

HttpServlet and concurrency

Might be a very dumb question for those who has mastered this.
How concurrent requests to httpServlet are handled? Can anyone point documentation on how Glassfish or Tomcat handles these requests.
Is there only one instance serving all concurrent requests?
We are considering to use HttpServlet along with url rewriting.
For sure we are going to lock/synchronize access to shared resources, however from documentation it is not clear whether the call to doGet and doPost itself is safe for concurrent users or not?
From documentation it "appears" (unless I missed something) there will only be one instance of HttpServlet which will serve all the requests, however somehow I cannot digest that.
if possible we want to avoid single threaded servlet or synchronized doGet/doPost.
If container is creating only one instance of HttpServlet, is there a way I can create pool of httpServlet instance and assign different instance to different concurrent users?
Thanks in advance.

Whenever any request comes to a servlet it executes in its own thread. This may only cause the problems when you have instance variables in your servlet, so avoinding instance variables in a servlets can resolve any threading issue.
If you want more than one instance, then you can implment the SingleThreadModel in your servlet then the servlet constainer will decide whether it needs to create more than one instance to serve the request or not, it may not gurantee the creation of a new instance though.
Sanjeev.

NoClassDefFoundError- HttpServlet

I have deployed my application and am now trying to access it from the
browser
but get this error message in the kjs console.
error: Exception: SERVLET-execution_failed: Error in executing
servlet mainservlet: java.lang.NoClassDefFoundError:
javax/servlet/http/HttpServlet
Exception Stack Trace:
java.lang.NoClassDefFoundError: javax/servlet/http/HttpServlet
I do have my application classpath fine. Here it is from kregedit-
c:\iplanet\ias6\pointbase\network\lib\pbnetwork35GA.jar;c:\iplanet\ias6\pointbase\client\lib\pbclient35GA.jar;
c:\iplanet\ias6\ias\usr\java\lib\tools.jar;c:\iplanet\ias6\ias\usr\java\jre\lib\rt.jar;c:\iplanet\ias6\ias\classes\java\activation.jar;
c:\iplanet\ias6\ias\classes\java\jms.jar;c:\iplanet\ias6\ias\classes\java\servlet.jar;c:\iplanet\ias6\ias\classes\java\mail.jar;
c:\iplanet\ias6\ias\classes\java\xml.jar;c:\iplanet\ias6\ias\lib\java\jdbc20.jar;c:\iplanet\ias6\ias\lib\java\javax.jar;
c:\iplanet\ias6\ias\lib\java\iascli.jar;c:\iplanet\ias6\ias\lib\java\kfcjdk11.jar;c:\iplanet\ias6\ias\lib\java;
c:\iplanet\ias6\ias\lib\classes.zip;c:\iplanet\ias6\ias\lib\java\ldapjdk.jar;c:\iplanet\ias6\ias\APPS;c:\iplanet\ias6\ias\lib\java\ktjdk11.jar;
c:\iplanet\ias6\ias\lib\java\kadmin.jar;c:\iplanet\ias6\ias\classes\java\tomcat\jasper.jar;c:\iplanet\ias6\ias\classes\java\jaxp\jaxp.jar;
c:\iplanet\ias6\ias\classes\java\jaxp\parser.jar;c:\iplanet\ias6\ias\STARTUPCLASS\startup.jar
Any suggestions? Thanks,
- Dilip

Hi,
Please check the environment classpath. Also please check if the application is deployed correctly.
Regards
Raj
Rajesh Kuppili wrote:
I have deployed my application and am now trying to access it from the
browser
but get this error message in the kjs console.
error: Exception: SERVLET-execution_failed: Error in executing
servlet mainservlet: java.lang.NoClassDefFoundError:
javax/servlet/http/HttpServlet
Exception Stack Trace:
java.lang.NoClassDefFoundError: javax/servlet/http/HttpServlet
I do have my application classpath fine. Here it is from kregedit-
c:\iplanet\ias6\pointbase\network\lib\pbnetwork35GA.jar;c:\iplanet\ias6\pointbase\client\lib\pbclient35GA.jar;
c:\iplanet\ias6\ias\usr\java\lib\tools.jar;c:\iplanet\ias6\ias\usr\java\jre\lib\rt.jar;c:\iplanet\ias6\ias\classes\java\activation.jar;
c:\iplanet\ias6\ias\classes\java\jms.jar;c:\iplanet\ias6\ias\classes\java\servlet.jar;c:\iplanet\ias6\ias\classes\java\mail.jar;
c:\iplanet\ias6\ias\classes\java\xml.jar;c:\iplanet\ias6\ias\lib\java\jdbc20.jar;c:\iplanet\ias6\ias\lib\java\javax.jar;
c:\iplanet\ias6\ias\lib\java\iascli.jar;c:\iplanet\ias6\ias\lib\java\kfcjdk11.jar;c:\iplanet\ias6\ias\lib\java;
c:\iplanet\ias6\ias\lib\classes.zip;c:\iplanet\ias6\ias\lib\java\ldapjdk.jar;c:\iplanet\ias6\ias\APPS;c:\iplanet\ias6\ias\lib\java\ktjdk11.jar;
c:\iplanet\ias6\ias\lib\java\kadmin.jar;c:\iplanet\ias6\ias\classes\java\tomcat\jasper.jar;c:\iplanet\ias6\ias\classes\java\jaxp\jaxp.jar;
c:\iplanet\ias6\ias\classes\java\jaxp\parser.jar;c:\iplanet\ias6\ias\STARTUPCLASS\startup.jar
Any suggestions? Thanks,
- Dilip

Does any one implemented solution for httpservlet request/response object in IWSDLInterceptor implemented class?

I am trying to handle Producer not available situation in which I am using Interceptor IWSDLInterceptor in WLP 10.3.4. I am able to retrieve exception using onWSDLException but from here if I have to forward my pageURL object I need httpservlet request and response. I tried my own filter class to have its own customize request and also tried it out all other Interceptor to see if any one can handle IOException. I did manage to throw my own Customize exception but that also did not work out as Page does not have any backing file or any supportive Controller class.
Does any one implemented solution for httpservlet request/response object in IWSDLInterceptor implemented class? or do we have any specific documentation in regards to this? As I am not able to find much martial on IWSDLInterceptor except Java API from Oracle and article defining Two way SSL handshake Producer.
Any kind of help is appreciated.
Thanks
PT

Thanks Emmanuel for your response but render behavior is not available for IWSDLRequestContext/IWDSLResponseContext object which IWSDLInterceptor uses for implementation.
Let me put my question in little simpler manner. May be my approach to the problem is not proper.
Problem : Handle Producer Not available (no application exists on server) on consumer side.
So far tried approach : Producer is not running then I am able to handle that TransportException at IInitCookieInterceptor/IHandleEventInterceptor onFault behaviour but in the case of Producer not even exists Consumer try to get WSDL fetch operation and failed with FileNotFoundException.
To handle this exception, I used IWSDLInterceptor which is available under IWSDLInterceptor.OnWSDLException (Oracle Fusion Middleware Java API for Oracle WebLogic Portal)
I am able to catch the exception but problem arise when application needs to forward at specific page/render portlet for this situation. For that it required request/response object but IWSDLInterceptor does not give any kind of instances to redirect request as there is no direct access to HTTPServlet request/response object.
I tried my custom request object to use there. I tried out custom filter object of IWSDLrequestContext. nothing works.
One approach works is to put producer WSDL file at consumer level. But in that, you need to handle different producer files for different environment. Which I don't think its a good approach.
eAny one Let me know if my approach to the problem/scenario is wrong. Or if I am missing out any other supporting interface which also required to handle this scenario. or I am using wrong interface for this scenario.
Thanks for your help in advance.
PT.

How solve import javax.servlet.http.HttpServlet err import javax.servlet.

Hi
I am trying to compile one servlet code using commancd prompt and i get
package javax.servlet.http does not exist import javax.servlet.http.HttpServlet;
error for following code
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
public class SampleServlet extends HttpServlet
public void saveToSession(HttpServletRequest request)
String testparam = request.getParameter("testparam");
request.getSession().setAttribute("testAttribute", testparam);
please help me

Try giving servlet..jar path in the class path variable

J2se vs j2ee javax.servlet.* & javax.servlet.HTTPServlet

Hi,
I guess I have a basic question....It is in j2se 1.4.2 API's one does not have the package javax.servlet.* or javax.servlet.HttpServer package/classes.How does one get to compile the java source file if it imports javax.servlet.* and javax.servlet.HttpServlet.,both of these are present in the j2ee API's.Help would be greatly appreciated.
Thanks
AS

Yup, pretty basic.
You're right - the javax.servlet and
javax.servlet.http packages are not part of the J2SE.
However, they are part of every servlet/JSP engine
you can find, including Tomcat and Sun ONE J2EE app.
Look for a j2ee.jar or servlet.jar (or servlet-api.jar
if you're using Tomcat 5.0.x) and you'll find those
classes. Once you locate the proper JAR, all you have
to do is make sure it's in your CLASSPATH when you
compile and run:
javac -classpath .;/full/path/to/servlet.jar *.java
MODThanks for the reply.So if we compile it we will get compile errors right?,without the appropriate classpath settings.Got you.
AS

Tomcat 5 can�t find javax.servlet.http.HttpServlet

Hi.
I don�t know if this is a simple question or not, but i didn�t find anything solving this problem and
i�m new to tomcat......
I�m trying to deploy my web application in my system. (Windows XP , j2sdk1.4.2_02, jakarta Tomcat 5, jakarta struts 1.1 and jakarta taglibs 1.1).No problems while compiling the .java classes and checked all the .jar files that my application needs to work (or that is what I think). I expand my .war file at /webapps on tomcat directory and startup Tomcat. Tomcat starts up but while starting I get the following errors...
17-feb-2004 17:58:50 org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on port 8080
17-feb-2004 17:58:51 org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 4948 ms
17-feb-2004 17:58:51 org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
17-feb-2004 17:58:51 org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/5.0.18
17-feb-2004 17:58:51 org.apache.catalina.core.StandardHost start
INFO: XML validation disabled
17-feb-2004 17:58:51 org.apache.catalina.core.StandardHost getDeployer
INFO: Create Host deployer for direct deployment ( non-jmx )
17-feb-2004 17:58:51 org.apache.catalina.core.StandardHostDeployer install
INFO: Processing Context configuration file URL file:C:\softProyecto\Tomcat5\conf\Catalina\localhost\admin.xml
17-feb-2004 17:58:55 org.apache.commons.digester.Digester endElement
GRAVE: End event threw exception
java.lang.reflect.InvocationTargetException
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at org.apache.commons.beanutils.MethodUtils.invokeMethod(MethodUtils.java:252)
     at org.apache.commons.digester.SetNextRule.end(SetNextRule.java:256)
     at org.apache.commons.digester.Rule.end(Rule.java:276)
     at org.apache.commons.digester.Digester.endElement(Digester.java:1058)
     at org.apache.catalina.util.CatalinaDigester.endElement(CatalinaDigester.java:123)
     at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source)
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
     at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
     at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
     at org.apache.commons.digester.Digester.parse(Digester.java:1567)
     at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDeployer.java:520)
     at org.apache.catalina.core.StandardHost.install(StandardHost.java:906)
     at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:527)
     at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:472)
     at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1008)
     at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:394)
     at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:166)
     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1133)
     at org.apache.catalina.core.StandardHost.start(StandardHost.java:832)
     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1125)
     at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:518)
     at org.apache.catalina.core.StandardService.start(StandardService.java:519)
     at org.apache.catalina.core.StandardServer.start(StandardServer.java:2345)
     at org.apache.catalina.startup.Catalina.start(Catalina.java:598)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:297)
     at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:398)
Caused by: java.lang.NoClassDefFoundError: javax/servlet/http/HttpServlet
     at java.lang.ClassLoader.defineClass0(Native Method)
     at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
it seems like C:\softProyecto\Tomcat5\conf\Catalina\localhost\admin.xml (C:\softproyecto\tomcat5 = tomcat�s home directory) needs javax.servlet.http.HttpServlet. And that comes from a Tomcat .jar file, i think.
After more and more messages..... here it comes my application (MapasRuido)...which needs javax.servlet.http.HttpServlet and compiled ok at compiling time!
INFO: Installing web application at context path /MapasRuido from URL file:C:\softProyecto\Tomcat5\webapps\MapasRuido
17-feb-2004 18:02:48 org.apache.catalina.startup.HostConfig deployDirectories
GRAVE: Error durante el despliegue del directorio MapasRuido de la aplicaci�n web
java.lang.NoClassDefFoundError: javax/servlet/http/HttpServlet
     at java.lang.ClassLoader.defineClass0(Native Method)
     at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
     at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
     at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
     at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
     at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:282)
     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
     at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1296)
     at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1230)
     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
     at java.lang.ClassLoader.defineClass0(Native Method)
     at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
     at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
     at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1677)
     at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:900)
     at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1350)
     at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1230)
     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
     at java.lang.ClassLoader.defineClass0(Native Method)
     at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
     at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
     at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1677)
     at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:900)
     at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1350)
     at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1230)
     at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:979)
     at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:887)
     at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3960)
     at org.apache.catalina.core.StandardContext.start(StandardContext.java:4283)
     at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:866)
     at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:850)
     at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:638)
     at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDeployer.java:320)
     at org.apache.catalina.core.StandardHost.install(StandardHost.java:875)
     at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:727)
     at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:477)
     at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1008)
     at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:394)
     at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:166)
     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1133)
     at org.apache.catalina.core.StandardHost.start(StandardHost.java:832)
     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1125)
     at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:518)
     at org.apache.catalina.core.StandardService.start(StandardService.java:519)
     at org.apache.catalina.core.StandardServer.start(StandardServer.java:2345)
     at org.apache.catalina.startup.Catalina.start(Catalina.java:598)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:297)
     at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:398)
17-feb-2004 18:02:48 org.apache.catalina.core.StandardHostDeployer install
INFO: Installing web application at context path from URL file:C:\softProyecto\Tomcat5\webapps\ROOT
17-feb-2004 18:02:48 org.apache.catalina.core.StandardHostDeployer install
INFO: Installing web application at context path /servlets-examples from URL file:C:\softProyecto\Tomcat5\webapps\servlets-examples
17-feb-2004 18:02:48 org.apache.catalina.core.StandardHostDeployer install
INFO: Installing web application at context path /tomcat-docs from URL file:C:\softProyecto\Tomcat5\webapps\tomcat-docs
17-feb-2004 18:02:49 org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on port 8080
tomcat�s web applications servlets-examples and tomcat-docs work fine, but my application doesn�t. Is there any relation between those errors? any idea about what happens?
Thank you in advance.

"...The CLASSPATH is ignored by Tomcat, of course. AND javac. AND java. AND Eclipse. AND NetBeans. AND JBuilder. And just about everything else in the Java universe..."
What I mean by this, of course, is that each of these requires you to set the CLASSPATH in the way they expect. None of them even looks for a system environment variable named CLASSPATH. You can waste a lot of time thinking that your CLASSPATH is "all set", but it's not.
Tomcat assumes the following for your Web app's CLASSPATH:
(0) The JDK rt.jar, of course,
(1) All the JARs in TOMCAT_HOME/common/lib,
(2) All the JARs in your WEB-INF/lib,
(3) All the .class files in your WEB-INF/classes
That's it. (Maybe one or two others, but those are the important ones.)
Eclipse and NetBeans have their own way to set CLASSPATH for each project. You'll have to learn how for those IDEs.
The CLASSPATH is still vitally important. The system environment variable just isn't part of it. - MOD

Service method in javax.servlet.http.HttpServlet

Hi All,
I have a doubt in the service method of javax.servlet.http.HttpServlet
There are two service methods in the javax.servlet.http.HttpServlet.
one is with protected and other is with public access specifier.
In the javadoc it is said that public service method dispatches client requests to the protected service method.
Why this type of design is required.
Instead of having a two service methods, Is it not possible to have a single service method and attain the functionality intended.
Are there any advantages by having two service methods.
I think there may be some idea/functionality behind these for having two service methods , which I am not able to understand.
Would be greatful , if someone can throw light on this .
Thanks,
Dhanasekaran.

This is just a theory, but here goes:
The public service() method takes arguments of ServletRequest and ServletResponse, presumably because that's the signature that the non-HTTP specific servlet engine requires.
The protected service() method of HttpServlet takes arguments of HttpServletRequest and HttpServletResponse and includes HTTP specific functions.
My guess is that the public service() method either casts the arguments to the Http objects or does work to create the Http objects before calling the protected method.

HttpServlet and multiple URL addresses question

Hi!
I've created a HttpServlet using the New... wizard (BTW, my web.xml file wasn't updated so I had to do it manually). I've implemented doGet and doPost methods in this class. I specified an url-pattern in web.xml as <url-pattern>/httpservlet/*</url-pattern>.
If I'd like more than one URL address inside this servlet, what do I need to do? I'd like to have an URL that only supports POST method. This is something I have now as my doGet method looks like this:
    response.setContentType(CONTENT_TYPE);
    PrintWriter out = response.getWriter();
    out.println("<html>");
    out.println("<head><title>HttpServlet</title></head>");
    out.println("<body>");
    out.println("<p>GET method is not supported. Please use POST method for XML messages.</p>");
    out.println("</body></html>");
    out.close();Now I'd like another URL that supports only GET method and has a parameter. This address will be used for downloading some PDF documents. Do I need another HTTP server? Do I have to create a jspx file (how do I 'tell' it that is in this servlet)? Are there other options?
Thank you in advance for any suggestions.
BB

Hi,
you can create another servlet mapping in web.xml for the same Servlet. However, note that the access path doesn't determine the access method. Your servlet still need to check if it was called from a GET or POST request
Frank

Httpservlet and javax sourcepath

ok what is the story with setting class paths I am using Jbuilder to write servlets but it keeps saying that httpSaervlet is not found in the class. Even when I open httpServlet beside it.I was just seeting the source path to where the javax file was it this right

You have to Add a library in the Project--->Project Properties--->Required Libraries(TAB)and then click on add button, a window will be displayed choose Servlet from there and click on OK buttons

Java HttpServlet Problem

I made a project with a HttpServlet. So I use some import lines:
import javax.servlet.*;
import javax.servlet.http.*;
But when I try to compile I get this error:
Error(2,1): cannot access directory javax\servlet; verify that directory is reachable from classpath and/or sourcepath
Error(3,1): cannot access directory javax\servlet\http; verify that directory is reachable from classpath and/or sourcepath
Can anyone help me?
Ben Wismans

For some reason, the "Servlet Runtime" library was not added to your project during the creation of your servlet( Did you use the Servlet Wizard? ) Anyhow, add the "Servlet Runtime" library to your project.

HttpSession and HttpServlet singletons?

Hi guys,
I have here two questions for better understanding of the HttpSession and HttpServlet classes:
1. Is the HttpSession object existing between the server and the client and used for data exchange a kind of singleton? E.g. if I call a servlet concurrently with different parameters (as shown above), will this conflict on evaluation of the session parameters on the servlet side?
"...MyPage.jsp?attr1=1..."
"...MyPage.jsp?attr1=2..."
2. Is the Servlet itself ( "public class MyServlet extends HttpServlet{..." ) also a singleton? I.e. for the above described use case also a problem?
Thanks.

user13612505 wrote:
Thanks so far!
So if I understood right:
1.There is always only one session per client. If several servlets or several instances of the same servlet >would write an attribute with the same name to the session, this would result in an undefined result (the
llast written value would be saved, the previos values would be lost).This is usually desirable behaviour because session attributes are normally shared by many servlets. Attributes with different significance should clearly have different names.
The solution for this would be: different attribute names for each servlet and before calling the same
servlet on the client side, I have to wait until the previous request to this servlet is finished.I don't really understand what you're saying here. Normally a servlet will only set a session attribute if it's to be accessed by later transactions. The whole point of session attributes is to span multiple transactions for the same client.
If you want to store an attribute for use in the same transaction (e.g. when you forward from Servlet to JSP) store it in a request attribute, not a session attribute.
>
2. I don't know when the application server (I'm using glassfish) creates a new instance of a servlet. So for this problem I would also have to wait on the client side (as described above).
No, it shouldn't matter how many instances of the Servlet are created. In general Servlets are "stateless", you don't use instance fields at all.
Servlets are "re-entrant", that is mulitple threads may use the same servlet object to process different transactions simultaneously. So it's crucial that a servlet doesn't change any of it's fields during the course of processing a transaction, and the best way to be sure is not to have any fields at all. (You could have fields that don't change, and initialise them in the init method or constructor).

HttpServlet

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