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Error when connecting JProfiler to JBoss 4

I want to profile a Java EE application runs on JBoss 4. I use Ubuntu . Java 1.5. JProfiler 8.0.1. Server is Jboss 4. Once I set the host as localhost and try to profile,(New Session -> Attach -> Attach to profile JVM(Local or remote) ) JProfiler says, "Could not connect to localhost:8849. Please make sure that the remote address is correct ". But in the terminal, it shows the JBoss starting and I can access the web applications as well. I want to trace all creating java Ojbects and their sizes. How can I solve this issue ?
EDIT: The error log file of JProfiler shows.
sun.awt.X11.XException: Cannot write XdndAware property
at sun.awt.X11.XDnDDropTargetProtocol.registerDropTarget(Unknown Source)
at sun.awt.X11.XDropTargetRegistry.registerDropSite(Unknown Source)
at sun.awt.X11.XWindowPeer.addDropTarget(Unknown Source)
at sun.awt.X11.XComponentPeer.addDropTarget(Unknown Source)
at java.awt.dnd.DropTarget.addNotify(Unknown Source)
at java.awt.Component.addNotify(Unknown Source)
at java.awt.Container.addNotify(Unknown Source)
at javax.swing.JComponent.addNotify(Unknown Source)
at java.awt.Container.addNotify(Unknown Source)
at javax.swing.JComponent.addNotify(Unknown Source)
at java.awt.Container.addNotify(Unknown Source)
at javax.swing.JComponent.addNotify(Unknown Source)
at java.awt.Container.addNotify(Unknown Source)
at javax.swing.JComponent.addNotify(Unknown Source)
at java.awt.Container.addNotify(Unknown Source)
at javax.swing.JComponent.addNotify(Unknown Source)
at java.awt.Container.addImpl(Unknown Source)
at java.awt.Container.add(Unknown Source)
at com.ejt.framework.gui.aq.b(ejt:290)
at com.ejt.framework.wizard.o.b(ejt:43)
at com.ejt.framework.wizard.o.<init>(ejt:18)
at com.ejt.framework.wizard.g.b(ejt:125)
at com.jprofiler.frontend.d.a.p.actionPerformed(ejt:29)
at com.jprofiler.frontend.g.g.l(ejt:63)
at com.jprofiler.frontend.g.g.a(ejt:17)
at com.jprofiler.frontend.g.h.run(ejt:56)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$400(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

Probably JBoss is not profiled, i.e. the profiling agent is not loaded.
You have to use the integration wizard to modify the JBoss start script.
Invoke
Session->Integration wizards->New Server Integration
select JBoss 4.x and follow the steps in the wizard.

Java Applet Error In Browser - java.lang.ExceptionInInitializerError

I'm trying to run my first java applet in my browser but when I open the HTML file which the applet class is embedded into, the following error occurs:
java.lang.RuntimeException: java.lang.ExceptionInInitializerError
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ExceptionInInitializerError
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$12.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.security.AccessControlException: access denied (java.util.PropertyPermission user.dir read)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPropertyAccess(Unknown Source)
at java.lang.System.getProperty(Unknown Source)
at Applet.MAIN.<clinit>(MAIN.java:39)
... 21 more
What should I do to solve this problem?
Here is the: entire error block

Applet has limited permissions. Non-signed applet cannot access file system and part of the system properties. In your case you tried to access user.dir.
You have the following solutions.
try to avoid using user.dir
sign your applet
do not use applet at all. Use java web start instead.

Youre trying to access something you dont have permission to
Caused by: java.security.AccessControlException: access denied (java.util.PropertyPermission user.dir read)
You can sign your applet
And/or set the permissions in the users home directory
http://docs.oracle.com/javase/1.4.2/docs/guide/security/permissions.html

Fingerprint on Java Web Start

When I start my application I get the following message:
Exception in thread "AWT-EventQueue-0" java.lang.ExceptionInInitializerError
at com.digitalpersona.onetouch.jni.Matcher.<clinit>(Matcher.java:8)
at com.digitalpersona.onetouch.processing._impl.DPFPEnrollmentFactoryImpl$EnrollmentImpl.<init>(DPFPEnrollmentFactoryImpl.java:40)
at com.digitalpersona.onetouch.processing._impl.DPFPEnrollmentFactoryImpl.createEnrollment(DPFPEnrollmentFactoryImpl.java:20)
at Formularios.CapturaHuella.<init>(CapturaHuella.java:245)
at Formularios.CapturaHuella$10.run(CapturaHuella.java:561)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "loadLibrary.otmcjni")
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkLink(Unknown Source)
at java.lang.Runtime.loadLibrary0(Unknown Source)
at java.lang.System.loadLibrary(Unknown Source)
at com.digitalpersona.onetouch.jni.MatchingLibrary.<clinit>(MatchingLibrary.java:16)
... 19 more

It means you don't have installed the fingerprint driver:
http://www.digitalpersona.com/support/downloads/software-updates/reader-engine/

typically this is happening when you have some static initialization block and there is something wrong - mostly due to NullPointerException. try to debug this initialization block carefully

The AccessControlException states that you do not have permission to load the DLL otmcjni.dll into your Java process.
Make sure that you have signed your JAR file.

How to resolve permission issue in applet?

I have one small problem with applet, I got following error.
Exception in thread "AWT-EventQueue-2" java.lang.ExceptionInInitializerError
at applet.JSGD_Register.jButtonInitActionPerformed(JSGD_Register.java:861)
at applet.JSGD_Register.access$1(JSGD_Register.java:841)
at applet.JSGD_Register$2.actionPerformed(JSGD_Register.java:195)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.security.AccessControlException: access denied (java.lang.RuntimePermission loadLibrary.jnifplib)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkLink(Unknown Source)
at java.lang.Runtime.loadLibrary0(Unknown Source)
at java.lang.System.loadLibrary(Unknown Source)
at SecuGen.FDxSDK.jni.JFPLib.<clinit>(JFPLib.java:68)
... 27 more
Why this occurs and how to resolve it?

First of all read this document - What Applets Can and Cannot Do? ** and decide what kind of code an applet allows. As #AndrewThompson pointed out (see comment) that signed applets do not have the security restrictions because they are digitally signed (signature) which proves that they came untampered from a particular trusted author.
For more information about signed applets check out :
Security in Rich Internet Applications
Understanding Signing and Verification

What's the difference between running the application from netbeans and running the jar?

I have a java application that works perfectly when running from Netbeans 7.1 but it crashes if I use the build jar.
I've been investigating the problem and I've noticed that the application holds on calling DriverManager.getConnection().
I'm doing something like:
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
Connection con = DriverManager.getConnection("jdbc:sqlserver://127.0.0.1:2304;user=username;password=12345;database=databasename");
I've also tried jtds but it has the same result.
I'm running on Windows 7 Home Premium
SQL Server 2008 (localhost)
Netbeans 7.1 (application works fine when running from Netbeans)
Java Version 1.6
Thread dump
java.lang.Exception: Stack trace
at java.lang.Thread.dumpStack(Unknown Source)
at joomlasyncrnzr.JoomlaSyncrnzrApp.getCon(JoomlaSyncrnzrApp.java:314)
at joomlasyncrnzr.JoomlaSyncrnzrApp.taxas(JoomlaSyncrnzrApp.java:604)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jdesktop.application.ApplicationAction.noProxyActionPerformed(Ap
licationAction.java:662)
at org.jdesktop.application.ApplicationAction.actionPerformed(ApplicatinAction.java:698)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
What could be causing this?

I had the same problem with the DriverManager.getConnection call just hanging indefinitely.
What solved the problem for me was going back to Java 6 Update 25. Update 29 seems to introduce a bug with the JDBC connection to SQL Server. I think Update 27 (or earlier) still work fine.

Maybe you're not setting your CLASSPATH to include the SQL Server driver when running the jar file, whereas Netbeans probably has it included for you already.