Access Datasource from Servlet Engine (Tomcat)

Hi,
I'm using datasource connections in my beans and event in servlets.. It works fine in JRun 3.1 environment.
But when I port to J2EE1.3 its throwing this exception...
I just want to understand whether it is a limitation in J2EE1.3 & Tomcat environment or it is a security problem or do I have to change any configuration file so that I can make the datasource connection available outside the J2EE environment.
java.lang.IllegalArgumentException: Unknown component type at com.sun.enterprise.naming.NamingManagerImpl.getComponentType(NamingManagerImpl.java:670) at com.sun.enterprise.naming.NamingManagerImpl.getMangledIdName(NamingManagerImpl.java:708) at com.sun.enterprise.naming.NamingManagerImpl.getComponentIdInternal(NamingManagerImpl.java:680) at com.sun.enterprise.naming.NamingManagerImpl.getComponentId(NamingManagerImpl.java:313) at com.sun.enterprise.naming.java.javaURLContext.getComponentContext(javaURLContext.java:397) at com.sun.enterprise.naming.java.javaURLContext.lookup(javaURLContext.java:51) at javax.naming.InitialContext.lookup(InitialContext.java:350) at com.camilion.env.ejb.EjbEnvironment.getJDBCConnection(EjbEnvironment.java:105) at com.camilion.report.servlet.ReportServlet.service(ReportServlet.java:49) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java:428) at org.apache.catalina.servlets.InvokerServlet.doGet(InvokerServlet.java:180) at javax.servlet.http.HttpServlet.service(HttpServlet.java:740) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247) at org.apache.catalina.core.ApplicationFilterChain.access$0(ApplicationFilterChain.java:197) at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:176) at java.security.AccessController.doPrivileged(Native Method) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:172) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243) at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:215) at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566) at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246) at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943) at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2314) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566) at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:368) at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:163) at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943) at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:995) at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1088) at java.lang.Thread.run(Thread.java:484)

I'm getting the same problem trying to lookup a datasource from a JSP with J2EE 1.3 reference implementation.

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Access EJB from Servlet that in different archive?

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I want to access ejb from servlet that .war and .jar not in single .ear. I want to try that just with annotation not xml descriptor cause is easy to understand for me. I use Glassfish. But i can't lookup that ejb. How can i lookup that ejb with jndi? Can't you give me example of servlet to access that? I not use JNDI.properties, are that caused i can't access my ejb? I just thing .war and.jar in one server, are i have to used JNDI.properties. can you explain how to use JNDI.properties in servlet or separate file?


But i can't lookup that ejb. How are you trying and what exception is occurring?
How can i lookup that ejb with jndi? [https://glassfish.dev.java.net/javaee5/ejb/EJB_FAQ.html|https://glassfish.dev.java.net/javaee5/ejb/EJB_FAQ.html]
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How to run a MS Access Query from Servlet

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Hi Jim,
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Hi,
I'm aving a problem accessing a stateful session bean from a servlet. I'm using a jndi lookup to do it because I need that a client has its own bean reference...
My code into the service method is:
InitialContext ctx;
try {
ctx = new InitialContext();
carrelloService = (CarrelloLocal)ctx.lookup("java:comp/env/ejb/Carrello");
and I have a reference to EJB into web.xml:
<ejb-local-ref>
<ejb-ref-name>ejb/Carrello</ejb-ref-name>
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Here's something simple that I have that works:
 
SimpleBean
 
@Stateless(name="SimpleBean")
public class SimpleBeanBean implements SimpleBeanLocal {
 
web.xml; -- note I use a whacko ejb-ref-name just to make it obvious where I'm using it.
 
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servlet:
 
package sab.otn681398.web;
import java.io.IOException;
import java.io.PrintWriter;
import javax.naming.InitialContext;
import javax.naming.NamingException;
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-steve-

Exceptions arsing while accessing DataSource from a stand alone java clie

Dear all responders,
can any one help in resolving my problem??the problem description is as follows:
i am using sun one application server 7.0 to deploy a J2EE Apllication
so i have created a data source using the admin page with the name
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i am able to obtain the context succussfully but the exception is thrown for the data source look up
the following exception is thrown
javax.naming.NameNotFoundException. Root exception is org.omg.CosNaming.NamingContextPackage.NotFound: IDL:omg.org/CosNaming/NamingContext/NotFound:1.0
at org.omg.CosNaming.NamingContextPackage.NotFoundHelper.read(NotFoundHelper.java:72)
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at com.sun.jndi.cosnaming.CNCtx.callResolve(CNCtx.java:440)
at com.sun.jndi.cosnaming.CNCtx.lookup(CNCtx.java:492)
at com.sun.jndi.cosnaming.CNCtx.lookup(CNCtx.java:470)
at javax.naming.InitialContext.lookup(InitialContext.java:347)
at Test.<init>(Test.java:27)
at Test.main(Test.java:47)
please help me in resolving the above problem
advance thanx to all those who intend to reply
please provide me a proper resolution

I think the appserver uses com.sun.enterprise.naming.SerialInitContextFactory on the server side to register different resources. Anything registered with SerialialInitContextFactory cannot be resolved with a CNCtxFactory.
Can you try using SerialInitContextFactory on the client side.

Access files from servlet

hi
how can i access a local text file using a servlet.

Presumably by "local" you mean a file on the server where the servlet is running? If so, you do what you would normally do in a Java program to access a local file. If by "local" you mean a file on some other system, which would be a bizarre meaning of the word, then the rules are the same as for any other Java program: that other system has to have a server running, and your servlet has to access it via that server.

Unable to access EJB from servlet

Hi,
I have in service method my servlet code.
Hashtable env = new Hashtable();
 env.put(Context.INITIAL_CONTEXT_FACTORY, "com.evermind.server.ApplicationInitialContextFactory");
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 env.put(Context.SECURITY_PRINCIPAL, "admin");
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this is how i have orion-ejb-jar.xml
 <enterprise-beans>
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javax.naming.NameNotFoundException: HelloName not found
 at com.evermind.server.rmi.RMIContext.lookup(RMIContext.java:149)
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 at com.evermind.server.ApplicationContext.lookup(ApplicationContext.java:88)
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 at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:782)
 at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:270)
 at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:112)
 at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:186)
 at java.lang.Thread.run(Thread.java:479)
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Ravi

Ravi --
The most portable and standards oriented solution is to define an ejb-ref in the web.xml for the servlet, and then look up the name using the formal EJB UNC model.
web.xml:
<ejb-ref>
<ejb-ref-name>ejb/AppSessionFacadeHome</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<home>faqapp.ejb.AppSessionFacadeHome</home>
<remote>faqapp.ejb.AppSessionFacade</remote>
</ejb-ref>
servlet lookup
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Object homeObject = ctx.lookup("java:comp/env/ejb/AppSessionFacadeHome");
EJBHome ejbHome = (EJBHome)
portableRemoteObject.narrow (homeObject, AppSessionFacadeHome.class);
cheers
-steve-

Accessing db from servlet

Hi,
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*******************part of participantDAO class*******************
public boolean updateParticipantTime (String tfNumber, String tfTime) throws Exception
Connection dbConnection;
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statement.executeUpdate (sqlText) ;
sqlText = "n/a" ;
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*********************SERVLET**************************
import javax.servlet.* ;
import javax.servlet.http.* ;
import java.io.* ;
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import java.lang.*;
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* @param request <code>HttpServletRequest</code>
* @param response <code>HttpServletResponse</code>
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HttpServletResponse response)
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String time = null;
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request.setAttribute("message", messageText);
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dispatcher.forward(request, response);
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dispatcher.forward(request, response); }+
catch (Exception e)+
+*{*+
System.out.println ("********* TIME FORMAT ERROR *********") ;*+
+*System.out.println ("An unexpected exception occurred:" + e) ;*+
+*System.out.println("Try again once more!");*+
+*nextPage("/jsp/UpdateTime.jsp", request, response);*+
+*return; }*+
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* @param request <code>HttpServletRequest</code>
* @param response <code>HttpServletResponse</code>
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private void nextPage (String nextURI, HttpServletRequest request,
HttpServletResponse response)
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request.getRequestDispatcher(nextURI).forward(request, response) ;
**********************JSP PAGE***************************
<%@ page import = "java.util.*" %>
<?xml version = "1.0" encoding="ISO-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
<link rel ="stylesheet" type="text/css" href="/atk84f/CSS/RaceStyle.css" />
<title>
Update participants finishing time
</title>
</head>
<body>
<img src ="/atk84f/images/running1.jpg" />
<a href="http://validator.w3.org/check?uri=referer"><img
src="http://www.w3.org/Icons/valid-xhtml11-blue"
alt="Valid XHTML 1.1" height="31" width="88" /></a>
 
 
 
 
 
 
<h2>Update finishing time</h2>
<%
String number = (String) request.getParameter("tfNumber");
String time = (String) request.getParameter("tfTime");
String messageText = (String)request.getAttribute ("message") ;
if(number == null)
number = "";
if(time == null)
time="";
if(messageText == null)
messageText = "";
%>

<form action ="/atk84f/servlet/UpdateTimeServlet" method="post">
 
<table>
<tr>
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<big><%= messageText %></big>
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Please do these things:
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- 2 tell use what actually happened, eg. show the error
- 3 simplify the problem, make an SSCCE
When that is done, we may be able to help.
Without that, here's all I can say:
I can't really tell from the pile of unformatted code what state the response is in, but if you are getting IllegalStateException, its because the response is no longer virgin and forwarding isn't permitted.

New Servlet Engine with iAS

Is it true that in the next version of iAS, a new servlet engine (TOMCAT perhaps) will be proposed to replace JSERV ?
null

WebLogic's Servlet engine is less than $1K / CPU I believe.
Peace,
Cameron Purdy
Tangosol Inc.
Tangosol Coherence: Clustered Coherent Cache for J2EE
Information at http://www.tangosol.com/
"Jon" <[email protected]> wrote in message
news:[email protected]..
Does anyone have experience using iPlanet 6.0 Servlet engine with
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physical servers. If so, any information on the implementation would
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Thanks,
Jon

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HI,
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Hello!
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output pdshow and file stderr.log, hs_err_pid2128.log attached.
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Please support CSC Helps Haiti
https://supportforums.cisco.com/docs/DOC-8895
https://supportforums.cisco.com

Best way to access JNDI configured DataSource from outside container

I'm not sure if this is the right forum category, but it seemed like a good place to start.
I have a DB2 database on an OS/390 mainframe that is configured as a JNDI datasource in WebSphere (WSAD) 5.1.x. I can get connections and do database transactions within my web-application just fine.
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There is also no possibility of bending these rules no matter how stupid or cumbersome they are.
So my question is, what is the best method in which to gain access to this JNDI DataSource or a Connection from this DataSource? Can I even get a DataSource from a JNDI lookup? Is JMS/RMI or some other acronymn that I don't know about the only way to acomplish this?
We're using Struts MVC -> Spring -> Hibernate in the webapp, if that helps.
Thanks in advance.

You seem to be asking: "how can a standalone app get a valid DB2 connection by leveraging the live objects in a WSAD application"?
While this is pretty far from my area of expertise, I don't think you can. While both JMS and RMI (and other technologies) can export some types of Java objects, they have to be objects that implement the java.io.Serializable interface. Connections cannot be serialized because these objects (normally) encapsulate a live TCP/IP connection. I don't see any fundamental reason a DataSource object couldn't be serialized other than security, but that very reason means that no reasonable implementation is going to be serializable; if it were serializable, you could almost certainly extract the value of the username and password from the serialized object. In other words, what you're really trying to do is get around security and Java's security is probably robust enough to prevent it.
If the DB credentials only live in the WSAD world, that's where the database work has to be done. However, there's no reason the work can't be driven by a servlet or JSP that is in turn invoked from a cron-driven script or application. Personally, I do such "event notifier" scripts in Perl; Java is a bit heavy for "start up, post to URL, shutdown", but if you have more work going on you could certainly use Java. If actually doing the work in the WSAD application is not acceptable, then you're probably stuck.

Accessing EJBs from a servlet

Hi everyone,
I deployed my EJB component in an Oracle 8.1.7 database and I try to access it from a servlet.
If I run my servlet from JDeveloper 3.2 (Web-to-Go), it all works fine. If I run my servlet from JRun 3.01 or from Tomcat 3.2.1, I get the following exception:
javax.naming.NoInitialContextException: Need to specify class name in environmen
t or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
at java.lang.Throwable.fillInStackTrace(Native Method)
at java.lang.Throwable.fillInStackTrace(Compiled Code)
at java.lang.Throwable.<init>(Compiled Code)
at java.lang.Exception.<init>(Compiled Code)
at javax.naming.NamingException.<init>(NamingException.java:104)
at javax.naming.NoInitialContextException.<init>(NoInitialContextException.java:58)
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:649)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:242)
at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:279)
at javax.naming.InitialContext.lookup(InitialContext.java:349)
at com.cognicase.framework.base.U0003.AbstractORB.getBean(AbstractORB.java:285)
at com.cognicase.framework.base.U0003.AbstractORB.getBean(Compiled Code)
at com.cognicase.demo.U2007BL.U2007WP_Users.lookupBean(U2007WP_Users.java:60)
at com.cognicase.framework.is.U0103.AbstractBeanWrapper.beforeBeanCall(AbstractBeanWrapper.java:121)
at com.cognicase.demo.U2007BL.U2007WP_Users.valideUser(U2007WP_Users.java:77)
at com.cognicase.demo.U2000WB.U2000MW_WorkSpace.CallEjb(Compiled Code)
at com.cognicase.demo.U2000WB.U2000MW_WorkSpace.doValidateLogin(Compiled Code)
at com.cognicase.demo.U2000WB.U2000MW_WorkSpace.processService(U2000MW_WorkSpace.java:98)
at Demo_0100_01.service(Demo_0100_01.java:128)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
at org.apache.tomcat.core.Handler.service(Compiled Code)
at org.apache.tomcat.core.ServletWrapper.service(Compiled Code)
at org.apache.tomcat.core.ContextManager.internalService(Compiled Code)
at org.apache.tomcat.core.ContextManager.service(Compiled Code)
at org.apache.tomcat.service.connector.Ajp13ConnectionHandler.processConnection(Compiled Code)
at org.apache.tomcat.service.TcpWorkerThread.runIt(Compiled Code)
at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(Compiled Code)
at java.lang.Thread.run(Compiled Code)
If I add my servlet classes, aurora_client.jar, mts.jar, vbjapp.jar and vbjorb.jar files to the CLASSPATH, it works fine.
The behavior is the same in JRun and Tomcat.
I don't like this solution since I have to make the CLASSPATH point to my application classes at the web server level instead of at the application context level.
Has anyone been able to solve this problem?
Thanks for your help.
null

Yes, I did. Actually, if I run my servlet in JDeveloper (Web-to-Go), it all works fine. I also extracted the code that calls the EJB from the servlet and I tested it in a small Java application, and it also works fine.
Things stop to work when I deploy my servlet in JRun or in Tomcat.
It appears that my code is correct, but the environment I try to run it is not, and I can't figure out what's wrong.
Can anyone help me?
<BLOCKQUOTE>quote:<HR>Originally posted by Sandeep Desai ([email protected]):
Have you provided the environmental settings in the servlet.
It should be :
import oracle.aurora.jndi.sess_iiop.ServiceCtx;
env.put(Context.URL_PKG_PREFIXES, "oracle.aurora.jndi");
env.put(Context.SECURITY_PRINCIPAL, username);
env.put(Context.SECURITY_CREDENTIALS, password);
env.put(Context.SECURITY_AUTHENTICATION, ServiceCtx.NON_SSL_LOGIN);
InitialContext ctx = new InitialContext(env);
Object obj = ctx.lookup("test/EJBHome");
HomeObject home = PortableRemoteObject.narrow(
obj,"HomeObject.class");
RemoteObject remote = home.create();
This should make it work!!
<HR></BLOCKQUOTE>
null

Frame access from servlet not working

Dear all,
I am running my servlets on Tomcat 5.5 and using JDK 1.6. I have a small program that uses codecs to access frames from a video file. PreAccessCodec implements Codec interface and PostAccessCodec extends PreAccessCodec. I set the two codecs into the processor's codec chain. The program is implemented as a thread and once started grabs frames and stores the images in a certain interval. The problem is this: whenever I start the thread from a main program, everything runs without a glitch. However, when I put the code in init() method of the servlet, I get the following error message:
The input format is not compatible with the given codec plugin: com.mapper.utils.PostAccessCodec@69d02b
Failed to realize: com.sun.media.ProcessEngine@1478a43
Cannot build a flow graph with the customized options:
    Unable to add customed codecs:
      com.mapper.utils.PreAccessCodec@15356d5
      com.mapper.utils.PostAccessCodec@69d02b
Error: Unable to realize com.sun.media.ProcessEngine@1478a43 I am using netbeans 5.5.1 to deploy my servlets. I doubt that the problem is with classpaths because the servlet doesn't complain when I am using JMF's classes like Processor.
I would really appreciate any help.
Thank you.
Message was edited by:
calculemus

The GE.iH() method should return false for
a ..head-full ..en-headed, not headless
environment, and I expect (from what you
reported above) that will return false for both
your servlet and application, and is apparently
not the problem.It returned false when I tried GE, and it was not the problem as you suggested. However, I now noticed in the logs:
java.awt.HeadlessException
I use Netbeans for the development, and I tried using -Dheadless=true and -Dheadless=false, it did not change anything...
I think it is time to check that assumption
more carefully.
My impression is that PreAccessCodec and
it's 'Post' equivalent are mentioned a lot in JMF
example code, but are custom classes,
built to suit the use at the time. Did you write the
Pre/PostAccessCodecs for this app.?Yes I customized them from the JMF sample codes. They are in the classpaths and are correctly read by the servlet. I did some logging and I actually saw that the code inside Pre/PostAccess was logging when my servlet was run.
>
So, what I am thinking, is that while the JMF
based Processor class may well be on the
server's
classpath, perhaps Pre/PostAccessCodec classes
are not.
oes a jar appear in the WEB-INF/lib directory,
that contains the Pre/PostAccessCodec.class?
Failing that, are the classes themselves in
WEB-INF/classes/(sub-dir according to package name)/ ?Nevertheless, just to double check I checked WEB-INF directory and the classes appear correctly in their appropriate 'package-folders'.
I figured out where exactly the thread was not running. In my PostAccessCodec class, I had overloaded getSupportedInputFormats() function to return RGB format.
public Format [] getSupportedInputFormats() {
Format [] fomats = {new RGBFormat()};
return fomrats;
When I changed it to return {VideoFormat()}, the codec initializes, but I get nothing when I want to access the frame.
I guess I will have to start another thread.
@moderators, please move the post if it is inappropriate to put it in this thread, my apologies.
The problem is still there and I am not able to get the frame access not working from the servlet. :(
Message was edited by:
calculemus
Message was edited by:
calculemus

Access Datasource from Servlet Engine (Tomcat)

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