Running in Servlet Container or Standalone?

How can I detect if I'm running in a servlet container or a standalone application?
if ( iAmRunningInAServletContainer() )
// do this
else
// do thatIs there a System property that all servlet containers set? I can't find any.

Hopes this helps,
http://java.sun.com/blueprints/guidelines/designing_webservices
I use jaxrpc and tomcat to host web services. It works good as long the web services don't need to be invoked internal to the app. I don't like working with anything other than the remote interface (ex. gen'd stubs) when calling remote methods from within my app. I think that hosting a web service in an ejb container allows you to access the service with jndi. That would be a nice feature to have. Although, if I used an ejb container I would change my implementation so that the web service proxy'd to an ejb and all internal access would use the ejb where external would go through the web service.
Matthew

Similar Messages

Is jsp runs under servlet container ?

i heard that jsp converted into servlet and compiled at once when it is requested .jsp engine involving this converting process.
is this file runs in same servlet container or any other jsp container?
Thanks and regards,

gunss wrote:
i heard that jsp converted into servlet and compiled at once when it is requested .jsp engine involving this converting process.Yes. The JSP is parsed and converted into a .java file, which is then compiled into a .class file. It is a servlet, and it runs in the servlet container.
is this file runs in same servlet container or any other jsp container?Where else would it run?
%

How to get servlet container name on which servlet is running

I tried getServletInfo(),but I couldn't get the information. Please give me code to find the servlet container on which servlet is running.
Is there any system property which will retrieve servlet container information such as its name and version
Thanks & Regards,
Nasrin.N

getServerInfo() should work.
What about getServerInfo() doesn't work for you?
My standard solution is to this in a JSP page:
<h2> Server Info </h2>
Server info = <%= application.getServerInfo() %> <br>
Servlet engine version = <%= application.getMajorVersion() %>.<%= application.getMinorVersion() %><br>
Java version = <%= System.getProperty("java.vm.version") %><br>Cheers,
evnafets

How do we run a servlet program in eclipse

how do we run a servlet program in eclipse.

Not at all, because servlets require a servlet container. Some Eclipse plugins (Lomboz etc.) do provide integration with those.

Thread pool in servlet container

Hello all,
I'm working on this webapp that has some bad response times and I've identified an area were we could shave off a considerable amount of time. The app is invoking a component that causes data to be catched for subsequently targeted apps in the environemnt. Our app does not need to wait for a response so I'd like to make this an asyncronous call. So, how best to implement this?...I considered JMS, but started working on a solution using the Java 1.4 backport of JSR 166 (java.util.concurrent).
I've been testing the use of a ThreadPoolExecutor, using an ArrayBlockingQueue. The work that each Runnable will perform involves a lot of waiting (the component we call invokes a web service, among a couple other distributed calls). So I figure the pool will be much larger than the queue. Our container has 35 execute threads, so I've been testing with a thread pool size of 25, and a queue of 10.
Any thoughts on this approach? I understand that some of this work could be simplified by JMS, but if I don't need to be tied to the container, I'd prefer not to. The code if much easier to unit test, and plays nicely with our continious build integration (which runs our junit test for us and notifies on errors).
Any thoughts are greatly appreciated...Thanks!!

Well, if it works, that's by far the best way to go - but note that creating threads in a servlet container means those threads are outside of the container's control. Many containers will refuse to give the new threads access to the JNDI context, even, and some may prevent you from creating threads at all.

Problem in running the servlet

I have compiled the servlet and put the class file HelloWorld.class inside
$CATALINA_HOME$/webapps/ROOT/WEB-INF/classes/
directory, under tomcat6.0.18
and also mapped servlet in
$CATALINA_HOME$/webapps/ROOT/WEB-INF/web.xml, as below
web.xml:
    <?xml version="1.0" encoding="ISO-8859-1"?>

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
   version="2.5">
<display-name>Welcome to Tomcat</display-name>
<description>
     Welcome to Tomcat
</description>
<servlet>
    <servlet-name>HelloWorld</servlet-name>
    <servlet-class>HelloWorld</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>HelloWorld</servlet-name>
    <url-pattern>/HelloWorld</url-pattern>
</servlet-mapping>
</web-app>and run the servlet using this url......*.http://localhost/HelloWorld*
but I got following error code under tomcat 6.0.18
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Error allocating a servlet instance
     org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
     org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
     org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
     org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
     org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
     java.lang.Thread.run(Thread.java:619)
root cause
java.lang.NoClassDefFoundError: HelloWorld (wrong name: hall/HelloWorld)
     java.lang.ClassLoader.defineClass1(Native Method)
     java.lang.ClassLoader.defineClass(ClassLoader.java:620)
     java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
     org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1847)
     org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:890)
     org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1354)
     org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
     org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
     org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
     org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
     org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
     org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
     java.lang.Thread.run(Thread.java:619)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.18 logs.is there something I did wrong?
Edited by: san_4u on Mar 16, 2009 1:20 AM

root cause
java.lang.NoClassDefFoundError: HelloWorld (wrong name: hall/HelloWorld)Is your servlet contains first line as package hall;If it is there,remove it from the servlet code. And run your program.
If you want to keep it, then make a folder named hall in classes folder and put your HelloWorld.class there. Also change <servlet-class> as
<servlet>
    <servlet-name>HelloWorld</servlet-name>
    <servlet-class>hall.HelloWorld</servlet-class>
</servlet>

Runtime process not working from servlet container

          Hello,
          I'm executing a standalone executable from the Runtime class, using exec.
          Process process = Runtime.getRuntime().exec(buildCommand.toString());
          There are threads monitoring the input and error streams. This same use of the Runtime
          class is used at least 5 other times in the servlet with no problems. The same method
          is also called from a JUnit test and also executes properly.
          The method called from the servlet however does not work. the executable it's calling
          is a C++ executable that uses an ODBC alias set up on the machine to connect to the
          Oracle database. For some reason the ODBC layer throws an exception while trying
          to connect when the executable is called from the servlet, rather than called from
          the command line or JUnit test.
          Does the servlet have a different environment than a client call from the JUnit test?
          Would it not have access to ODBC drivers it needs? Could there be some sort of security
          setting that the servlet container is set too low?
          Any information would be terrific.
          Thanks,
          Sara


Thanks!
I borrowed a DVD drive and everything installed correctly.

Servlet Container, how many containers?

i heard that there are several containers in java to execute the java application.. i know few details about servlet container.. which will act as container to process java programs..etc,
can anyone explain me what are other containers available?

i heard that there are several containers in java to
execute the java application.. i know few details
about servlet container.. which will act as container
to process java programs..etc,Different kinds of containers, sure. Servlets/JSPs run in a servlet/JSP container, EJBs run in an EJB container.
There are several implementations of each: Tomcat and Jetty for servlets/JSPs, WebLogic and JBOSS for EJBs.
>
can anyone explain me what are other containers available?Which others did you have in mind?
%

New installation of iPlanet 7.0.14 fails to initialize servlet container

I have two servers that I have installed iPlanet 7.0.14 on, with a locally installed copy of the latest 1.6.0_31 JDK.
On one server, when I start the webserver, it initializes the internal servlet container properly, but on the other, it fails. Both servers should be set up identically, and both are in zones on Solaris 10 Sparc boxes (M4000s) that should be identically configured.
Here is what I see in the startup on the server where it is not working (I have blanked out the IPs and hostnames of the system):
Oracle iPlanet Web Server 7.0.14 B02/13/2012 13:53
info: CORE3016: daemon is running as super-user
info: CORE5076: Using [Java HotSpot(TM) Server VM, Version 1.6.0_31] from [Sun Microsystems Inc.]
info: WEB0100: Loading web module in virtual server [admin-server] at [admingui]
info: WEB0100: Loading web module in virtual server [admin-server] at [jmxconnector]
info: HTTP3072: admin-ssl-port: https://*****:61000 ready to accept requests
info: CORE3274: successful server startup
Oracle iPlanet Web Server 7.0.14 B02/13/2012 14:29
info: wl-init reports: WebLogic Server Plugin version 1.1 <WLSPLUGINS_11.1.1.6.0_SOLARIS.SPARC64_111122.1115>
info: CORE5076: Using [Java HotSpot(TM) 64-Bit Server VM, Version 1.6.0_31] from [Sun Microsystems Inc.]
failure: PWC1240: Container StandardEngine[com.sun.web-1].StandardHost[*****-80].StandardContext[] has not been started
java.lang.ExceptionInInitializerError
     at org.apache.catalina.core.StandardContext.start(StandardContext.java:4963)
     at com.sun.webserver.connector.nsapi.WebModule.start(WebModule.java:240)
     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1224)
     at org.apache.catalina.core.StandardHost.start(StandardHost.java:924)
     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1224)
     at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:520)
     at org.apache.catalina.startup.Embedded.start(Embedded.java:917)
     at com.sun.enterprise.web.PwcWebContainer.onStartup(PwcWebContainer.java:70)
     at com.sun.webserver.connector.nsapi.WebContainer.start(WebContainer.java:497)
     at com.sun.webserver.init.J2EERunner.confPostInit(J2EERunner.java:304)
Caused by: java.lang.NullPointerException
     at org.apache.catalina.util.ExtensionValidator.<clinit>(ExtensionValidator.java:125)
     ... 10 more
failure: PWC1240: Container StandardEngine[com.sun.web-1].StandardHost[*****].StandardContext[] has not been started
java.lang.NoClassDefFoundError: Could not initialize class org.apache.catalina.util.ExtensionValidator
     at org.apache.catalina.core.StandardContext.start(StandardContext.java:4963)
     at com.sun.webserver.connector.nsapi.WebModule.start(WebModule.java:240)
     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1224)
     at org.apache.catalina.core.StandardHost.start(StandardHost.java:924)
     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1224)
     at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:520)
     at org.apache.catalina.startup.Embedded.start(Embedded.java:917)
     at com.sun.enterprise.web.PwcWebContainer.onStartup(PwcWebContainer.java:70)
     at com.sun.webserver.connector.nsapi.WebContainer.start(WebContainer.java:497)
     at com.sun.webserver.init.J2EERunner.confPostInit(J2EERunner.java:304)
info: HTTP3072: http-listener-1: https://*****:443 ready to accept requests
info: HTTP3072: http-listener-2: http:/*****:80 ready to accept requests
info: CORE3274: successful server startup
Oracle iPlanet Web Server 7.0.14 B02/13/2012 14:29
info: IdcNSAuth::idcInit reports: Initializing Content Server NS Authorization plugin
info: wl-init reports: WebLogic Server Plugin version 1.1 <WLSPLUGINS_11.1.1.6.0_SOLARIS.SPARC64_111122.1115>
info: CORE5076: Using [Java HotSpot(TM) 64-Bit Server VM, Version 1.6.0_31] from [Sun Microsystems Inc.]
failure: PWC1240: Container StandardEngine[com.sun.web-1].StandardHost[*****-80].StandardContext[] has not been started
java.lang.ExceptionInInitializerError
     at org.apache.catalina.core.StandardContext.start(StandardContext.java:4963)
     at com.sun.webserver.connector.nsapi.WebModule.start(WebModule.java:240)
     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1224)
     at org.apache.catalina.core.StandardHost.start(StandardHost.java:924)
     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1224)
     at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:520)
     at org.apache.catalina.startup.Embedded.start(Embedded.java:917)
     at com.sun.enterprise.web.PwcWebContainer.onStartup(PwcWebContainer.java:70)
     at com.sun.webserver.connector.nsapi.WebContainer.start(WebContainer.java:497)
     at com.sun.webserver.init.J2EERunner.confPostInit(J2EERunner.java:304)
Caused by: java.lang.NullPointerException
     at org.apache.catalina.util.ExtensionValidator.<clinit>(ExtensionValidator.java:125)
     ... 10 more
failure: PWC1240: Container StandardEngine[com.sun.web-1].StandardHost[*****].StandardContext[] has not been started
java.lang.NoClassDefFoundError: Could not initialize class org.apache.catalina.util.ExtensionValidator
     at org.apache.catalina.core.StandardContext.start(StandardContext.java:4963)
     at com.sun.webserver.connector.nsapi.WebModule.start(WebModule.java:240)
     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1224)
     at org.apache.catalina.core.StandardHost.start(StandardHost.java:924)
     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1224)
     at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:520)
     at org.apache.catalina.startup.Embedded.start(Embedded.java:917)
     at com.sun.enterprise.web.PwcWebContainer.onStartup(PwcWebContainer.java:70)
     at com.sun.webserver.connector.nsapi.WebContainer.start(WebContainer.java:497)
     at com.sun.webserver.init.J2EERunner.confPostInit(J2EERunner.java:304)
info: HTTP3072: http-listener-1: http://*****:80 ready to accept requests
info: HTTP3072: http-listener-2: https://*****:443 ready to accept requests
info: CORE3274: successful server startup
I also have the log output from turning the server to 'finest' mode, but that's really really long. It's mostly more of the same "container not started" issue. I should mention that there are NO servlets or anything else being loaded so far, and the HTTP/HTTPS serving seems to work as expected. There is a WebLogic plugin installed, but it's on both boxes, and causes no issues on the other system.

I thought that might be the case, too, so I did a clean install of the webserver without any configuration changes - just a basic server using all the defaults. I got the same result after that - the servlet stuff fails to load before it even gets to the WLS plugin loading.
I also tried to do a clean reinstall of the JDK and again, no difference in the behavior.
My guess is that it could be a library or other issue on the server itself, but I don't know what to look for.

How to run a servlet with jboss

Hello everybody my name is Noe I'm new in the forums . I want some information about how to configure and run a servlet and a jsp for the jboss server . Please help me, I have about 4 days searching information about this, and there is few information or the tutorials that I read were insuficient. I need one tutorial step by step or someone that explain me how to do this. Please help me with this
Thank's a lot.

Which error do you get!
If you just want to run jsps and servlets the you should use tomcat instead of jboss.
jboss is an aplication server that uses tomcat and adds an EJB container.
usually you use a build.xml file to run deployment scripts but if not, then you can manually copy the project folder into the jboss --> instance ---> web zone (I said this way because I dont remember the exactly folder)
Another thing is that you must have the project estructure built on the correct way defined by the estandar. I mean the WEB-INF folder, the web.xml file, the classes folder, etc.
next time yo may consider to post this on the j2ee section.
a web.xml file.
What problem do you exactly have when doing this, you cant ask for a tutorial step by step, but punctual things. Try it and if you cant then ask.

How do i run a servlet??????

running servlets:i downloaded jsdk but how do i run a servlet? i got the error
C:\WINDOWS\Desktop>javac HTTPGetServlet.java
Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/tools/javac/M
ain
when i tried to run my servlet, please help
thanks

As mentioned in another post in the thread, servlets run from within a web server that has pre-loaded the jvm and serves web requests. Often they are called 'sevlet containers' as they act like a wrapper program for the actual vm. Tomcat is such a web server, quite a popular one for running servlets, and is considered the reference implementation for a sevlet/jsp server. you can read up on it at...
http://jakarta.apache.org/tomcat/index.html
To get you started, this is what i did to set up tomcat. Im using RedHat Linux at home, so this may differ to what you have to do initially.
First, make sure you have at least the jsdk and jsdk ee installed and the appropiate JAVA_HOME and J2EE_HOME environment variables set.
I am using the Apache web server to handle web page requests on my box. If the request is for a context containing a servlet or jsp file (context is a tomcat term for a particular location or path in the url) then apache passes the request to tomcat via a apache module and a special protocol. Tomcat then runs the .class file or .jsp file, returns the output to apache which then returns the output back to the browser. So initially you should set up and have the apache web server running.
Next download and install the jserv or tomcat module for apache, which apache uses to communicate with tomcat via a special protocol, and the tomcat rpms from...
http://jakarta.apache.org/builds/jakarta-tomcat/release/v3.2.3/rpms/
...Im using 3.2.3 which works fine. you may try the later versions if you like.
Install the tomcat rpms. They should dump a whole lot of stuff in a /var/tomcat directry, including some nice sample and admin apps. if you had downloaded and installed the tomcat-manuals rpm you can find lots of helpful information in the /usr/doc/tomcat-{your version here}/ directry. This is what you should probably read through now!
Once that is done, its simply a matter of adding a reference in your httpd.conf file to the tomcat.conf file in the tomcat/conf dir (if you want to have complete control over the tomcat module and contexts) or tomcat-apache.conf (in the same directry) if youd like tomcat to handel its own configuration of apache. something like...
include /var/tomcat/conf/tomcat.conf
...should do.
then run tomcat start (in /usr/bin/) and apache and away you go. You should be able to point your browser to your.server.com/admin/ and get the tomcat admin tools. This allows you to add view and delete contexts to your server (say for separating different server-side applications). your.server.com/examples/ has some nice stuff as well.
Hope this helps. I warn you im not an expert and haven't looked at this stuff for some time. I probably have something wrong so please, experts, if you see something stuffed up let us know.

Problems compiling and running a servlet

I have been trying to compile and run my servlet program to no avail. Please help. I am using Tomcat 5.5 and j2sdk1.4.2
These are the errors I keep getting. I have already set the classpath appropriately.
MyServletTest.java:5: package javax.servlet does not exist
import javax.servlet.*;
^
MyServletTest.java:6: package javax.servlet.http does not exist
import javax.servlet.http.*;
^
MyServletTest.java:10: cannot resolve symbol
symbol : class HttpServlet
location: class MyServletTest
public class MyServletTest extends HttpServlet {
^
MyServletTest.java:13: cannot resolve symbol
symbol : class HttpServletRquest
location: class MyServletTest
public void doGet (HttpServletRquest req, HttpServletResponse resp)
^
MyServletTest.java:13: cannot resolve symbol
symbol : class HttpServletResponse
location: class MyServletTest
public void doGet (HttpServletRquest req, HttpServletResponse resp)
^
MyServletTest.java:48: cannot resolve symbol
symbol : class HttpServletResponse
location: class MyServletTest
private void printResultSet (HttpServletResponse resp, ResultSet rs)
throws SQLException {
^
MyServletTest.java:52: cannot resolve symbol
symbol : method prinln (java.lang.String)
location: class java.io.PrintWriter
out.prinln("<html>");
^
7 errors

Thank you. I have managed to compile the program but
when I run it I get:
Exception in thread "main"
java.lang.NoSuchMethodError: main
How should I run a servlet?Servlets are not run like applications. You need to deploy them to a servlet container, and they get invoked and initialized by constructor, init() method and goGet/doPost().

Running a servlet code over Tomcat 4.1

MY HTML CODE THAT CALLS THE SERVLET:
<html>
<body>
<form method="post"action="http://localhost:1234/examples/servlets/program">
Name : <input type=text name="text1">
<input type="submit">
</form>
</body>
</html>
MY SERVLET CODE THAT I HAVE ALREADY SUCCESSFULY EXECUTED ON TOMCAT 3.2.1:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class program extends HttpServlet
public void service(HttpServletRequest
req,HttpServletResponse res)throws
IOException,ServletException
PrintWriter out= res.getWriter();
out.println("Hello World!");
String str= req.getParameter("text1");
out.println("WElcome:"+str);
out.close();
1.==>Any body please tell what all classpaths I have to set here?
2.==>Do I need to write any xml file for running this code ..if yes then please tell what to write in the xml code and where to save it.
3.==>Please tell me where to save my servlet code and html code in Tomcat 4.1
4.==> Do I need any batch file during its execution and lastly how to execute it in Tomcat 4.1...
I have already successfully executed the program in Tomcat 3.2.1
5==> Please check if my codes are OK to run over Tomcat 4.1

You should get in the habit of creating war files ( Web Archive file ).
You can deploy a war file to any servlet container like tomcat.
Maven2 is a nice tool that helps you build war files.
Here is an article on how to get started.
http://www.javaworld.com/javaworld/jw-12-2005/jw-1205-maven.html

Difference between web server and servlet container

I can't able to figure out the techincal difference between web server(such as java web server) and servlet containers(such as jakarta-tomcat).If you please let me know then I will be very thankful to you.

The web server serves html pages to browsers that request pages. It can also send images, javascript, flash content, and a few other things. When a request comes into the web server for a servlet or jsp, the web server calls on the Servlet container to do THOSE jobs.
The Servlet container is the execution environment for a jsp or servlet (they are both servlets) to run Java code on the server and do logic.
So you see, the web server spits out static content, where either no logic is involved, or the client's web browser does the logic. The Servlet container is used for applications that execute code, perform logic, connect to databases, etc.
So they work together, but are completely separate logically.

How to run a servlet in tomcat 5.0.

Hi all,
how to run a servlet in tomcat 5.0
please tell me the entire procedure....(directory structure)
step by step....

hi :-)
http://java.sun.com/j2ee/tutorial/1_3-fcs/doc/Servlets.html
or
http://www.google.com.ph/search?hl=en&q=java+servlet+tutorial&btnG=Google+Search&meta=
regards,

Running in Servlet Container or Standalone?

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