J2EE/JSP/EJB - ojvm debugging hangs

I'm using JDeveloper version 10.1.2.0.0 (build 1811) at following enviroment:
Server: Windows XP
Client: Windows XP
JAVA:1.4.2_04 that comes with Jdev
I have the following problem:
I have a project with *.jsp and *.java files when i try do debug a java file using
the ojvm he get's to the breakpoint then if try to the debug using step over/step into
the process hangs no exception and no coming back. If i use the others vm (hotspot, client or sever)
Jdev doesn't hang. The problem only occurs where debugging with ojvm.
When the debug process hangs no way to know what it's doing cause it's not
possible to pause (cliking the debugger pause button there's no reaction) just stopping de
process by cliking 2 times at the debug stop button.
I changed from Jdev 9.0.5.16.15 to Jdev 10.1.2.0.0 (build 1811) same problem.
Any help?

I see. A logger is software that catches the fallout and presents it to you.
Well, I'm slightly resistant because I can program this stuff OK, but I work from home .. there's no backup for me, no sysad to help. I've recently moved to Linux and I'm groping around it. So I fear a day or two of non-productive farting about trying to get a logger to work, and I could do without it.
Then again, it can take me a good while to debug something blind.
So. Any recommendation for a simple logger? Are they java or do they depend on the OS? Oh, and free/open source of course :-)
Or, if anyone could tell me how to get my printlns to work that would be good too :-)
J

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Hi,
Thanks for reminding me to check on this.
Currently you can get to it in the data pane, but it isn't pretty.
Expand "out: oracle.jsp.runtime.OracleJspWriter".
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J2EE Architecture (EJB)

I have become increasing disillusioned with J2EE and EJB�s in particular. I am no longer sure what they are trying to achieve and how the �objectives� are implemented. Writing the simplest EJB by hand is time consuming. Using something like XDocolet produces mountains of �Pseudo-Code� in comment blocks. The very idea of using comments in code to write code seems perverse to me. Surely comments are for comments and code is for code. After all this what is generated? The simplest of SQL statements. What are the benefits ? More efficient code ? More robust code ? Easier to maintain code ? More portable code ?
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Performance and learning curve seem to be the biggest complaints about J2EE and EJBs.
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%

How to upload a file into server using j2ee jsp and servlet with bean?

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u don't need j2ee and struts to do file uploading. An example is as such
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Error converting j2EE-Specific ejb xml to object representation

I am trying to webservice using Sun one. I got four entity beans and two sessions. I exposed the business of the session beans as webservice function.
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When I created a webservice, and when I am trying to deploy the web service the follwing error occured.
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Here,
BSApp -- J2ee application in which webservice is included
BSManagerContrl --- is one of the two session bean which i created
Book -- is the entity bean
I also checked the module of the session bean to verify whether i included the Book enity bean or not. Other wise I would i successfully tested the session bean.
Thank you
[b][b]Deployment Error -- Error while running ejbc -- Fatal Error from EJB Compiler -- Failed to load
deployment descriptot for BSApp
Cause: Error converting j2EE-Specific ejb xml to object representation
BSManagerContrl_EJBModule.jar
app_BSApp BSManagerContrl_EJBModule
Referencing error: This bundle has no bean of name [Book]
<ejb><ejb-name>Book</ejb-name><jndi-name>ejb/Book</jndi-name><pass-by-refernece>false</pass-by-reference><cmp><mapping-properties>

Hi parsuram,
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Good books for learning Java(Servlets,JSP,EJB,etc.,),Javascript.

Hi Experts,
Can you suggest me some good books on java , javascript.The books should include the internals of Servlets,JSP,EJB.
Thanks
vishal

http://forum.java.sun.com/thread.jspa?forumID=54&threadID=756427&start=7
http://forum.java.sun.com/thread.jspa?forumID=54&threadID=751055
http://forum.java.sun.com/thread.jspa?forumID=54&threadID=743429
http://forum.java.sun.com/thread.jspa?forumID=54&threadID=742997&start=11
http://forum.java.sun.com/thread.jspa?forumID=54&threadID=750775&start=24
Just a simple search for this forum....
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JJ

EJB Lock debugging

Hi All,
I enabled EJB Lock Debugging by setting
weblogic.debug.ejb.locking=true
We have around 100 CMP Entities in the System .
However, after this, I observed that many "ready" and "passivated" messages appear
in the log as below:
[BaseEJBContext] : lock obtained by: 'Scrub timer lock' on: 'Context hashcode:
'522737', primaryKe
y: '1803', flags: 'READY ', needsRefresh: 'false', needsFlush: 'false', pinCount:
'0', owner: 'Scr
ub timer lock', ejbObject hashcode: '6781345', bean hashcode: '2775737''
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'522737', primaryKe
y: '1803', flags: 'PASSIVATED ', needsRefresh: 'false', needsFlush: 'false', pinCount:
'1', owner:
'null', ejbObject hashcode: '0', bean hashcode: '2775737''
I see that log files are getting full very fast.. Is it that for every bean it
generates the message? After sucessful login, It again started printing above
messages (I guess for almost all entities)..
Thank you for clarifying my doubt.
Regards,
Nilesh.

I'm not sure I understand your question. If you enable to the debug
logging checks on a big system, you will definitely see lots of output.
-- Rob
Nilesh wrote:
Hi All,
I enabled EJB Lock Debugging by setting
weblogic.debug.ejb.locking=true
We have around 100 CMP Entities in the System .
However, after this, I observed that many "ready" and "passivated" messages appear
in the log as below:
[BaseEJBContext] : lock obtained by: 'Scrub timer lock' on: 'Context hashcode:
'522737', primaryKe
y: '1803', flags: 'READY ', needsRefresh: 'false', needsFlush: 'false', pinCount:
'0', owner: 'Scr
ub timer lock', ejbObject hashcode: '6781345', bean hashcode: '2775737''
[BaseEJBContext] : lock released by: 'Scrub timer lock' on: 'Context hashcode:
'522737', primaryKe
y: '1803', flags: 'PASSIVATED ', needsRefresh: 'false', needsFlush: 'false', pinCount:
'1', owner:
'null', ejbObject hashcode: '0', bean hashcode: '2775737''
I see that log files are getting full very fast.. Is it that for every bean it
generates the message? After sucessful login, It again started printing above
messages (I guess for almost all entities)..
Thank you for clarifying my doubt.
Regards,
Nilesh.

Accessing remove EJBs while debugging using the Embedded Application Server

I'm trying to configure to debug a multi-tier application (servlets + EJBs) where a servlet accesses EJBs set up on a second OC4J application server. I've set up rmi.xml in the embedded application server to reference my second application server by adding the line.
<server host="127.0.0.1" username="admin" port="23791" password="password"/>
When I run the embedded application server it seems to hang, with the stack in
the following state:
OC4J main()
OC4J launchOC4JCommandLine()
ApplicationServer launchCommandLine()
Thread join()
Thread join(0)
Object wait(0)
The following exception is generated on the second application server
C:\Program Files\Oracle\JDeveloper9i\j2ee\home>java -jar oc4j.jar
Oracle9iAS (9.0.2.0.0) Containers for J2EE initialized
java.lang.NullPointerException
java.lang.ClassLoader com.evermind.server.rmi.RMIInputStream.getClassLoa
der()
java.lang.Class com.evermind.server.rmi.RMIInputStream.resolveClass(java
.io.ObjectStreamClass)
java.io.ObjectStreamClass java.io.ObjectInputStream.inputClassDescriptor
java.lang.Object java.io.ObjectInputStream.readObject(boolean)
java.lang.Object java.io.ObjectInputStream.readObject()
int java.io.ObjectInputStream.inputObject(boolean)
java.lang.Object java.io.ObjectInputStream.readObject(boolean)
java.lang.Object java.io.ObjectInputStream.readObject()
void com.evermind.server.rmi.RMIConnection.handleBindObject()
void com.evermind.server.rmi.RMIConnection.run()
void com.evermind.util.ThreadPoolThread.run()
Has anyone got any ideas what is happening here and how I can fix it?
Thanks,
Mark.

This is an OC4J question. Try posting your message to the Products > Application Server > J2EE forum. Someone there should be able to answer your question.

Accessing remote EJBs while debugging using the Embedded Application Server

I'm trying to configure to debug a multi-tier application (servlets + EJBs) where a servlet accesses EJBs set up on a second OC4J application server. I've set up rmi.xml in the embedded application server to reference my second application server by adding the line.
<server host="127.0.0.1" username="admin" port="23791" password="password"/>
When I run the embedded application server it seems to hang, with the stack in
the following state:
OC4J main()
OC4J launchOC4JCommandLine()
ApplicationServer launchCommandLine()
Thread join()
Thread join(0)
Object wait(0)
The following exception is generated on the second application server
C:\Program Files\Oracle\JDeveloper9i\j2ee\home>java -jar oc4j.jar
Oracle9iAS (9.0.2.0.0) Containers for J2EE initialized
java.lang.NullPointerException
java.lang.ClassLoader com.evermind.server.rmi.RMIInputStream.getClassLoa
der()
java.lang.Class com.evermind.server.rmi.RMIInputStream.resolveClass(java
.io.ObjectStreamClass)
java.io.ObjectStreamClass java.io.ObjectInputStream.inputClassDescriptor
java.lang.Object java.io.ObjectInputStream.readObject(boolean)
java.lang.Object java.io.ObjectInputStream.readObject()
int java.io.ObjectInputStream.inputObject(boolean)
java.lang.Object java.io.ObjectInputStream.readObject(boolean)
java.lang.Object java.io.ObjectInputStream.readObject()
void com.evermind.server.rmi.RMIConnection.handleBindObject()
void com.evermind.server.rmi.RMIConnection.run()
void com.evermind.util.ThreadPoolThread.run()
Has anyone got any ideas what is happening here and how I can fix it?
Thanks,
Mark.

This is an OC4J question. Try posting your message to the Products > Application Server > J2EE forum. Someone there should be able to answer your question.

How to upgrade web app to J2EE compliant, EJB, etc.

I support an application that was designed and created before the EJB 2.0 spec
came out. It was built by a regional consulting company, who used their own application
framework instead of EJB stuff. Their framework mainly consists of classes to
handle transactions, JDBCconnections, and what is basically their equivalent of
an EJB, called a Domain Object. The framework is actually pretty impressive and
works quite well.
I'm trying to evaluate whether it would be worth 'upgrading' the entire application,
to use EJBs and other things to make it J2EE compliant. I've worked with JSPs
and servlets for a couple years, but I've no experience with EJBs. I've pieced
together an extremely simply stateless-session bean and have been able to use
it on a JSP, but now I'm trying to get entity beans working, and can't find any
examples or tutorials of how to invoke, load, create, etc. an EJB in a JSP/servlet.
Can anyone recommend a resource for this? I've just ordered the latest Enterprise
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using EJBs within JSPs and servlets.
Thanks

Hello Karthik,
I just tried to solve my problem with your suggestions, unfortunately, my JSP channel still doesn't work :(
The portal server keeps reporting "Server Error..." when I tried to add query at the end of the href.
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JSPs, EJBs in WebLogic Server 6.1

          Hi everyone,
          I'm starting to develop my first j2ee application. Mainly it is a few jsp pages
          accessing ejbs business logic.
          I would like to implement a security system to prevent anonymous users to access
          the jsp pages.
          It is possible to configure in a descriptor the user information and a profile
          associated with each user, such as read, write, update, delete...? When i refer
          these users i'm talking about the customers that will user the application..they
          are not weblogic users.
          In a few words...i want to implement a basic security system.
          Thanks for your help,
          Best Regards,
          João Seixas
          +351 93 8487351
          [email protected]
          [email protected]


Please post this to the security newsgroup.
          Joao Carlos Seixas wrote:
          > Hi everyone,
          > I'm starting to develop my first j2ee application. Mainly it is a few jsp pages
          > accessing ejbs business logic.
          > I would like to implement a security system to prevent anonymous users to access
          > the jsp pages.
          > It is possible to configure in a descriptor the user information and a profile
          > associated with each user, such as read, write, update, delete...? When i refer
          > these users i'm talking about the customers that will user the application..they
          > are not weblogic users.
          > In a few words...i want to implement a basic security system.
          >
          > Thanks for your help,
          > Best Regards,
          > João Seixas
          > ------------------------------------
          > +351 93 8487351
          > [email protected]
          > [email protected]
          > ------------------------------------
          Regards,
          Ann
          Developer Relations Engineer
          BEA Support

Standard Javabean inside a JSP/EJB application

Hello!
I want to use a JSP-file as a graphical user interface for a j2EE-application. I want to use a standard Javabean as an intermediate connector between the JSP and the Enterprise Java Beans.
Deployment details:
- 2 bean-Jars inside a EJB-module
- A JSP-file inside a .WAR-file
But what about the standard Javabean, where shall I put it?
What are the correct settings in the deployment tool?....
bye from
G�ran, Stockholm

You just need the standard JavaBean available to the EJB as well as the JSP. One nice way is to package such beans into a JAR and include the JAR in the EJB module as well as the WAR as a library.

Exception : JSP & EJB

Hi,
I'm working on a project but it doens't work perfectly.
It use J2EE, EJB and JSP technology but I'm fresh in this field.
At the moment, sometimes (but not for each utilisation and I don't unterdstand why !) there is a Servlet exception which is :
A Servlet Exception Has Occurred
Exception Report:
javax.servlet.ServletException: Cannot create bean of class util.DocumentationServicesBean
Root Cause:
java.lang.ClassNotFoundException: class util.DocumentationServicesBean : java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
     java.rmi.RemoteException: Client not authorized for this invocation.
     at java.beans.Beans.instantiate(Beans.java:211)
     ... ... ...If someone know the reason of this problem, please let me know.
Thanks !

it's not a servlet exception but when ur jsp/servlet is trying to invoke the EJBs, by any means, like creating a new instance, or just getting the pre-existed data by some finder method etc. etc., some times it doesn't have sufficient rights to do that call. Then ur ejb server throws an error, which ultimately comes to the webserver in the form of ServletException.
java.rmi.RemoteException: Client not authorized for this invocation.
at java.beans.Beans.instantiate(Beans.java:211)check ur deployment descriptor for the different roles and their rights, and different methods and permissions for them.
good luck,

J2EE without EJB

hello
i want to ask how can i use the J2EE container without implementing EJB's. i just want to use servlets, JSP, and classes. is this possible and how can i find info about this. thanx
Feras
[email protected]

Hi Feras,
The purpose of a J2EE container (such as OC4J) is to execute J2EE applications. A J2EE application is comprised of modules. There are basically two types of modules: "client" and "ejb". A J2EE application can contain any combination of modules -- therefore it may only have a single "client" module (and no "ejb" module -- for example).
Have you not read the available documentation? For the latest version of OC4J, the documentation is available from:
http://otn.oracle.com/docs/products/ias/doc_library/903doc_otn/index.htm
And there is also the J2EE specification and related documentation, that is available from:
http://java.sun.com/j2ee
Hope this answers your question.
Good Luck,
Avi.

JSP, EJB in Jboss 4 with mySQL database. Error in connecting to database

Hi, i using JBoss 4-0-1 with jsp and mySQL database. I get this example from a book using stateless session beans. However i modify it so it can connect to mySQL database.
This is my code for jsp.
<%@ page import="asg.MusicEJB.*,
java.util.*,
javax.naming.Context,
javax.naming.InitialContext,
javax.rmi.PortableRemoteObject" errorPage="error.jsp" %>
<%--
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     They appear outside the generated _jspService() method,
     which gives them class scope.
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     and read the Music Collection database to get the
     recording titles once, we place this code inside
     method jspInit().
     The EJB business method getMusicList()
     returns a collection of RecordingVO objects which we
     store in ArrayList albums.
--%>
<%!
     MusicHome musicHome;
     Music mymusic;
     ArrayList albums;
     Properties properties=new Properties();
     public void jspInit() {
               properties.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
               properties.put(Context.PROVIDER_URL, "localhost:3306");
               System.out.println("............................in properties");
          try {
               //Context initial = new InitialContext();
               InitialContext jndiContext = new InitialContext(properties);
               //Object ref = jndiContext.lookup("MusicEJB");
               Object objref = jndiContext.lookup("java:comp/env/ejb/EJBMusic");
               musicHome = (MusicHome)PortableRemoteObject.narrow(objref, MusicHome.class);
               mymusic = musicHome.create();
               albums = mymusic.getMusicList();
               System.out.println(".............................in line 64");
          } catch (Exception ex) {
               System.out.println("Unexpected Exception............: " +
                         ex.getMessage());
               ex.printStackTrace();
%>
<%--
     The following scriptlet accesses the implicit
     request object to obtain the current URL
     and saves it to the session object for later retrieval.
     It also saves variable mymusic, so we can
     make remote calls to our Music EJB, and the collection of
     RecordingVO objects. These variables will all be available
     to other pages within the session.
--%>
<%
     String requestURI = request.getRequestURI();
     session.putValue("url", requestURI);
     session.putValue("mymusic", mymusic);
     session.putValue("albums", albums);
%>
<html>
<head>
<title>Music Collection Database Using EJB & JSP Version 9.7</title>
</head>
<body bgcolor=white>
<h1><b><center>Music Collection Database Using EJB & JSP</center></b></h1>
<hr>
<p>
There are <%= albums.size() %> recordings.
<form method="post" action="musicPost.jsp">
<p>
Select Music Recording:
<select name="TITLE">
<%
     // Generate html <option> elements with the recording
     // titles stored in each RecordingVO element.
     // Obtain the current title from the session object
     // (this will be null the first time).
     String title;
     String currentTitle = (String)session.getValue("curTitle");
     if (currentTitle == null) currentTitle = "";
     RecordingVO r;
     Iterator i = albums.iterator();
     while (i.hasNext()) {
          r = (RecordingVO)i.next();
          title = r.getTitle();
          if (title.equals(currentTitle)) {
               out.println("<option selected>" + title + "</option>");
          else {
               out.println("<option>" + title + "</option>");
%>
</select><p><p>
<%--
     Provide a "View Tracks" button to submit
     the requested title to page musicPost.jsp
--%>
<input TYPE="submit" NAME="View" VALUE="View Tracks">
</form>
</body>
</html>Message was edited by:
chongming

This is the deployment descriptor for the .ear file.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE application PUBLIC '-//Sun Microsystems, Inc.//DTD J2EE Application 1.3//EN' 'http://java.sun.com/dtd/application_1_3.dtd'>
<application>
<display-name>MusicDAOApp</display-name>
<description>Application description</description>
<module>
    <web>
      <web-uri>war-ic.war</web-uri>
      <context-root>music</context-root>
    </web>
</module>
<module>
    <ejb>ejb-jar-ic.jar</ejb>
</module>

</application>
And this is the deployment for the ejb class files:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ejb-jar PUBLIC '-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN' 'http://java.sun.com/dtd/ejb-jar_2_0.dtd'>
<ejb-jar>
<display-name>MusicEJB</display-name>
<enterprise-beans>
    <session>
      <display-name>MusicEJB</display-name>
      <ejb-name>MusicEJB</ejb-name>
      <home>asg.MusicEJB.MusicHome</home>
      <remote>asg.MusicEJB.Music</remote>
      <ejb-class>asg.MusicEJB.MusicBean</ejb-class>
      <session-type>Stateless</session-type>
      <transaction-type>Bean</transaction-type>
      <env-entry>
        <env-entry-name>MusicDAOClass</env-entry-name>
        <env-entry-type>java.lang.String</env-entry-type>
        <env-entry-value>asg.MusicEJB.MusicDAOCloudscape</env-entry-value>
      </env-entry>
     <env-entry>
     <env-entry-name>dbUrl</env-entry-name>
        <env-entry-type>java.lang.String</env-entry-type>
        <env-entry-value>jdbc:mysql://localhost/music</env-entry-value>
      </env-entry>
      <env-entry>
        <env-entry-name>dbUserName</env-entry-name>
        <env-entry-type>java.lang.String</env-entry-type>
        <env-entry-value>chongming</env-entry-value>
      </env-entry>
      <env-entry>
        <env-entry-name>dbPassword</env-entry-name>
        <env-entry-type>java.lang.String</env-entry-type>
        <env-entry-value>kcm82</env-entry-value>
     </env-entry>
      <security-identity>
        <description></description>
        <use-caller-identity></use-caller-identity>
      </security-identity>
    </session>
</enterprise-beans>
</ejb-jar>I can combine the jar and war files into a ear file. deploying is alright without any errors.
However when i run the jsp, it prompt this error:
You Have Encountered an Error
Stack Trace
java.lang.NullPointerException
     at org.apache.jsp.musicGet_jsp._jspService(org.apache.jsp.musicGet_jsp:111)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
     at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
     at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
     at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159)
     at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
     at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
     at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
     at java.lang.Thread.run(Thread.java:595)
How to i solve the error? I look at he catch results in the command prompt of JBoss , i found that when running, the code will be caught by the exception and display this:int.java:527)
at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWor
kerThread.java:112)
at java.lang.Thread.run(Thread.java:595)
13:55:21,375 INFO [STDOUT] Unexpected Exception............: EJBException:; nes
ted exception is:
javax.ejb.EJBException: getMusicList: SQLException during DB Connection:
The url cannot be null
13:55:21,375 INFO [STDOUT] java.rmi.ServerException: EJBException:; nested exce
ption is:
javax.ejb.EJBException: getMusicList: SQLException during DB Connection:
The url cannot be null 13:55:21,375 INFO[STDOUT] at org.jboss.ejb.plugins.LogInterceptor.handleException(LogInterceptor.java:352)
13:55:21,375 INFO [STDOUT] at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:196)
What can i do to solve the problem? please helpMessage was edited by:
chongming
Message was edited by:
chongming
Message was edited by:
chongming

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