Christian Hauser

Thank you!

Originally posted by Christian Hauser:

My question is now if void is such an RMI-IIOP compliant return type. Is it?

What about arrays? Should be fine in my opinion, but where can I get a list of what exactly RMI-IIOP compliant means?

Thanks,
Christian

Hello all
The EJB 2.0 Spec states that a business home method in the remote home interface of an entity bean must have an RMI-IIOP compliant return type.

My question is now if [B]void[/B] is such an RMI-IIOP compliant return type. Is it?

Thanks in advance for your help.
Christian

I identified the problem. I had the j2ee.jar in JAVA_HOMEC/jre/lib/ext. I removed it there and now it works.

I'm sorry for this post. Next time I'll boot my brain before posting a mesage.

Christian

Hello

I've finally begun reading "Head First EJB". In the first chapter there is a tutorial to build a simple enterprise bean. I understand the code, however, I cannot start SUN's RI Server (J2EE 1.3.1).

If I enter 'j2ee -verbose' at the command prompt I get several exceptions:
... java.lang.ClassNotFoundException: COM.cloudscape.core.RemoteXaDataSource at java.net.URLClassLoader$1.run(URLClassLoader.java:199) 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:235) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:141) at com.sun.enterprise.repository.JdbcXAResource.createDataSource(JdbcXAResource.java:65) at com.sun.enterprise.resource.ResourceInstaller.installJdbcXADataSources(ResourceInstaller.java:458) at com.sun.enterprise.resource.ResourceInstaller.installJdbcDataSources(ResourceInstaller.java:349) at com.sun.enterprise.server.J2EEServer.run(J2EEServer.java:264) at com.sun.enterprise.server.J2EEServer.main(J2EEServer.java:972) No local string for poolmgr.datasourceerror Error in creating data source object No local string for jms.start Starting JMS service... No local string for enterprise.log.logging.serverversion.started No local string for enterprise.log.using.vm.name.version.from No local string for enterprise.log.vm's.classpath No local string for enterprise.log.j2ee.homedirectory No local string for enterprise.log.logging.serverversion.started No local string for enterprise.log.using.vm.name.version.from No local string for enterprise.log.vm's.classpath No local string for enterprise.log.j2ee.homedirectory No local string for enterprise.log.logging.serverversion.started No local string for enterprise.log.using.vm.name.version.from No local string for enterprise.log.vm's.classpath No local string for enterprise.log.j2ee.homedirectory No local string for jms.start.failed Couldn't start JMS service... javax.jms.JMSException: unable to locate resource bundle: com.sun.jms.service.LocalStrings at com.sun.jms.service.JMSManagerImpl.startJMSService(JMSManagerImpl.java:91) at com.sun.enterprise.jms.JmsUtil.startJmsService(JmsUtil.java:169) at com.sun.enterprise.server.J2EEServer.run(J2EEServer.java:268) at com.sun.enterprise.server.J2EEServer.main(J2EEServer.java:972) javax.jms.JMSException: unable to locate resource bundle: com.sun.jms.service.LocalStrings at com.sun.jms.service.JMSManagerImpl.startJMSService(JMSManagerImpl.java:91) at com.sun.enterprise.jms.JmsUtil.startJmsService(JmsUtil.java:169) at com.sun.enterprise.server.J2EEServer.run(J2EEServer.java:268) at com.sun.enterprise.server.J2EEServer.main(J2EEServer.java:972) java.lang.RuntimeException: unable to locate resource bundle: com.sun.jms.service.LocalStrings at com.sun.enterprise.server.J2EEServer.run(J2EEServer.java:346) at com.sun.enterprise.server.J2EEServer.main(J2EEServer.java:972) J2EE server reported the following error: unable to locate resource bundle: com. sun.jms.service.LocalStrings Error executing J2EE server ... java.lang.NoClassDefFoundError: COM/cloudscape/core/AbstractDataSource at com.sun.jms.service.JMSServiceImpl.stop(JMSServiceImpl.java:1334) at com.sun.jms.service.JMSServiceImpl.stop(JMSServiceImpl.java:1313) at com.sun.jms.service.JMSServiceImpl$1.run(JMSServiceImpl.java:107)

I'd be very glad if someone could give me a hint on what I might be missing. I have set J2EE_HOME and added J2EE_HOME/bin to the path.

Thanks in advance,
Christian

Hi Marty and others
I had a problem some time ago and wonder if that could now be implemented better using Servlets 2.4 and JSP 2.0. I needed a session counter that kept track of the active sessions, so that I roughly knew how many users were online.
I implemented a SessionCounter class that implemented HttpSessionListener. On sessionCreated() I incremented a static variable and on sessionDestroyed I decremented the static variable (setting it to 0 when it got negative).
The problem there was the fact that this web server rebooted very often (at least twice a day). After every reboot I lost my static variable (it was reset to 0). However, the sessions had been restored by Tomcat but (of course) I got no sessionCreated() events for those restored sessions... So for at least 2-3 hours (due to a high session timeout) I got a too low count of active users.
Now I would like to know if there is a more reliable solution to this problem using the new Servlet Spec 2.4 or if there are new event listeners.
Thank you for any hint.
Regards,
Christian
[ November 12, 2003: Message edited by: Christian Hauser ]

Hi Marty and others
I had a problem some time ago and wonder if that could now be implemented better using Servlets 2.4 and JSP 2.0. I needed a session counter that kept track of the active sessions, so that I roughly knew how many users were online.
I implemented a SessionCounter class that implemented HttpSessionListener. On sessionCreated() I incremented a static variable and on sessionDestroyed I decremented the static variable (setting it to 0 when it got negative).
The problem there was the fact that this web server rebooted very often (at least twice a day). After every reboot I lost my static variable (it was reset to 0). However, the sessions had been restored by Tomcat but (of course) I got no sessionCreated() events for those restored sessions... So for at least 2-3 hours (high session timeout)
Now I would like to know if there is a more reliable solution to this problem using the new Servlet Spec 2.4 or if there are new event listeners.
Thank you for any hint.
Regards,
Christian

Hello Eclipse contributors
I'm quite new to writing Eclipse plugins thus my question might be quite ridiculous.
When writing a plugin for Eclipse should I also use internal and external packages?
For example, should I use packages in the form com.mycompany.myplugin.internal.whatever? Or only if I provide extension points to my plugin for other developers to enhance my plugin?
Thanks for clarifying this.
Christian

Thank you Mike.
In fact, I was just about to start updating this thread when I read your post.
Christian

Thank you Steve for pointing me to your JAMon API. I'll have a look at it.
However, I still do not understand WHY it is possible that I get a negative session count. Why should there be more sessionDestroyed() calls than sessionCreated() (overall)?
Christian (still confused).

Okey, but why is it that I get negative numbers? Is this a problem of my ServletEngine or does it have to be this way?
Christian (a little confused about HttpSessionEvents)

Hello
I wrote a JSP and a Servlet some time ago that both count the active sessions of a web application and display them.
To do that I wrote a class SessionCounter which implements HttpSessionListener and thus is being informed when a new session is created or a session has been destroyed.
Unfortunately there seems to be a problem with my program, because the web application says that there are currently -16 active sessions.
Maybe there is a problem within my code or some resources within the servlet engine (ServletExec 4.1) are not reset when restarted.
I hope someone can give me a hint.
Thank you in advance,
Christian
Code of JSP (similar in Servlets in other web applications):
<tr> <td>Concurrent sessions:</td> <td><%= SessionCounter.getActiveSessions() %></td> </tr> <tr> <td>Last refresh:</td> <td><%= new Date() %></td> </tr> <tr> <td>Last session change:</td> <td><%= SessionCounter.getLastChange() %></td> </tr>
Here's the class SessionCounter, which belongs to a utility JAR that is situated in the lib directory of each web application.
public class SessionCounter implements HttpSessionListener { /** Static variable to keep track of the current number of active sessions. */ private static int activeSessions = 0; /** Static variable to keep track of the time of the last change. */ private static Date lastChangeDate = new Date(); public void sessionCreated(HttpSessionEvent event) { activeSessions++; lastChangeDate = new Date(); } public void sessionDestroyed(HttpSessionEvent event) { activeSessions--; lastChangeDate = new Date(); } public static int getActiveSessions() { return activeSessions; } public static Date getLastChange() { return lastChangeDate; } }

I've tested it and it worked with the following code. Try using my UpperCaseTextField insted of a normal JTextField and it works:
/* * UpperCaseTextField.java */ import java.awt.*; import javax.swing.*; import javax.swing.text.*; public class UpperCaseTextField extends JTextField { public UpperCaseTextField() { super(); } public UpperCaseTextField(Document doc, String text, int columns) { super(doc, text, columns); } public UpperCaseTextField(int columns) { super(columns); } public UpperCaseTextField(String text) { super(text); } public UpperCaseTextField(String text, int columns) { super(text, columns); } protected Document createDefaultModel() { return new LimitedDocument(); } static class LimitedDocument extends PlainDocument { public void insertString(int offs, String str, AttributeSet a) throws BadLocationException { if (str == null) { return; } // Set the text of this document to uppercase super.insertString(offs, str.toUpperCase(), a); } } }
Good luck,
Hausi

I would try something like this:
public class UpperCaseTextField extends JTextField { ... protected Document createDefaultModel() { return new UpperCaseDocument(); } static class UpperCaseDocument extends PlainDocument { public void insertString(int offs, String str, AttributeSet a) throws BadLocationException { ... } } }
I know I've seen something like this before, but I don't remember where.
HTH,
Hausi