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log4j2 in JNLP results Classnotfoundexception

we have an old desktop application which was running on log4j. this application gets deployed using JNLP on the users system and then is connecting to server at our end. we are in the process of upgrading the application to log4j2. we have upgraded the server side code and it works fine. for the JNLP side of code, though we have done all the changes and deployed the application properly we are ending up with an exception which we dont seem to find the cause off. any help here is appreciated..
the exception is as listed below..
java.lang.ClassNotFoundException: org.apache.log4j.Logger
at java.net.URLClassLoader.findClass(Unknown Source)
at com.sun.jnlp.JNLPClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
at java.lang.Class.getConstructor0(Unknown Source)
at java.lang.Class.getConstructor(Unknown Source)
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:429)
at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:525)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:272)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:246)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:395)
at com.abcxyz.core.log.Logger.<clinit>(Logger.java:150)
at com.abcxyz.core.log.DefaultLog4jHelper.<init>(DefaultLog4jHelper.java:91)
at com.abcxyz.core.log.DefaultLog4jHelper.initLogger(DefaultLog4jHelper.java:44)
at com.abcxyz.ui.main.CMS.<clinit>(CMS.java:115)
at com.abcxyz.ui.main.InitializeCMS.main(InitializeCMS.java:40)
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 com.sun.javaws.Launcher.executeApplication(Unknown Source)
at com.sun.javaws.Launcher.executeMainClass(Unknown Source)
at com.sun.javaws.Launcher.doLaunchApp(Unknown Source)
at com.sun.javaws.Launcher.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
the exception point to a class file in the log4j-1.2.17.jar (our old jar). i am sure i dont have the old jar anywhere in the code or any part of the code referring the the old jarfile.
pasted below is the sysArgs section of the JNLP where i am referring to the new properties file

I am not familiar with JNLP, but according to your stacktrace, program cannot find. In Log4j2 package org.apache.log4j was changed to org.apache.logging.log4j. As a result it is not available.
One of easiest solutions in your case - to use Log4j 1.x bridge (Here is Migration guide)
If you want to use current version add to <argument> param to use log4j2 impl (by default it is uses org.apache.commons.logging.impl.LogFactoryImpl configured for log4j 1.x)
org.apache.commons.logging.LogFactory=org.apache.logging.log4j.jcl.LogFactoryImpl

we have found the solution. in our case there were two issues
the jar signing was not proper. the jars have manifest files under the meta-inf folder. the value of this folder was corrupted. we manually edited the file and preserved the original values for everything except the SHA keys and then resigned these jar.
in the log4j2-api jar there is a log4j-character.properties file which was getting corrupted while signing the jar using ant script. after the signing we replaced this file in the jar with the copy of the file saved from before the signing.
above to steps resolved our issue. i know what i wrote above might not make much sense to someone. happy to provide screen grabs in case on demand someone comes across this issue.

Self-signed (jdk 7u45) Applet got NullPointerException when runs on SSL in firefox and chrome

I am using an applet in my web application.
I create self-signed applet jar file and compile classes using Oracle JDK 1.7.45.
In client side, I use JRE 1.7.51 and import the certificate.
The applet works fine in three browsers (IE, Mozilla Firefox, Google Chrome) when I use the application on SSL protocol. The problem is that I got the following NullPointerException when I try to run applet in the chrome and Firefox browser while using the application in http without SSL mode, but it still works in IE.
java.lang.NullPointerException
at sun.plugin2.applet.Plugin2ClassLoader.getTrustedCodeSources(Unknown Source)
at com.sun.deploy.security.CPCallbackHandler$ParentCallback.strategy(Unknown Source)
at com.sun.deploy.security.CPCallbackHandler$ParentCallback.openClassPathElement(Unknown Source)
at com.sun.deploy.security.DeployURLClassPath$JarLoader.getJarFile(Unknown Source)
at com.sun.deploy.security.DeployURLClassPath$JarLoader.access$1000(Unknown Source)
at com.sun.deploy.security.DeployURLClassPath$JarLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.deploy.security.DeployURLClassPath$JarLoader.ensureOpen(Unknown Source)
at com.sun.deploy.security.DeployURLClassPath$JarLoader.<init>(Unknown Source)
at com.sun.deploy.security.DeployURLClassPath$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.deploy.security.DeployURLClassPath.getLoader(Unknown Source)
at com.sun.deploy.security.DeployURLClassPath.getLoader(Unknown Source)
at com.sun.deploy.security.DeployURLClassPath.getResource(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.plugin2.applet.Plugin2ClassLoader.findClassHelper(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.initAppletAdapter(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
In this link http://www.oracle.com/technetwork/java/javase/7u45-relnotes-2016950.html , I see these 2 related 7u45 known issues:
Area: Deployment/Plugin
Synopsis: Applet could fail to load by throwing NPE if pack compression is used with deployment caching disabled.
If a JAR file is using pack compression with manifest entries
Permissions and Caller-Allowable-Codebase while deployment caching is
disabled, then:
• The Permissions manifest entry will be ignored. (This can be seen
from the fact that yellow warning is there on security dialog even
though the Permissions attribute is there.) This only happens if
Caller-Allowable-Codebase attribute is present along with the
Permissions attribute.
• The Caller-Allowable-Codebase attribute will cause the applet to
fail to load by throwing a java.lang.NullPointerException.
If you want to use pack compression with the
Caller-Allowable-Codebase attribute, there are two possible
workarounds:
• Enable caching and all issues listed will disappear.
• Do not use the pack property jnlp.packEnabled=true while deploying
the applets using Caller-Allowable-Codebase andpremissions property.
Instead use the ContentType servlet for serving the pack files.
Area: Deployment/Plugin
Synopsis: Non-JNLP trusted applet fails to load using the file:\ URL. Local trusted applets that do not deploy using a JNLP file will
fail to load by throwing a java.lang.NullPointerException. You can
work around this issue by using one of the following methods:
• Use a JNLP file to launch the applet.
• Try loading the applet over HTTP or HTTPS.
But I don’t use pack compression, also I use a JNLP file to launch the applet and the problem continues to appear.

If your web application is accessed via an authentication step, it is possible that the Java plugins for Chrome and Firefox are unable to download the jar files - when they try to access the URL for the applet, they most probably are greeted by your login page. You could confirm this with Fiddler.
This problem does not appear in IE, because the Java plugin is able to use the session held by the browser itself, so the applet loader is able to immediately download the jar file.
If this is the case for you, the obvious solution is to allow unauthenticated access to the jar file. If you are using IIS, this is done by adding exceptions in web.config.

Class not found exception while loading the applet(org.omg.CORBA.INITIALIZE: can't instantiate default ORB implementation)

I have a applet which usually uses jacorb.jar in endorsed directory under jre .Now I made a change in code to download jacorb.jar tp the windows temp folder (eg. C:\Users\ADMINI~1\AppData\Local\Temp\2\endorsed) .Using the jre installed in our local along with jars downloaded from the webpage we used to launch to the applet from different clients. But while launching the applet i receive the below error
org.omg.CORBA.INITIALIZE: can't instantiate default ORB implementation org.jacorb.orb.ORB vmcid: 0x0 minor code: 0 completed: No
at org.omg.CORBA.ORB.create_impl(Unknown Source)
at org.omg.CORBA.ORB.init(Unknown Source)
at com.nm.util.OrbUtils.initAppletORB(OrbUtils.java:2)
at com.nm.ani.share.aniclient.AniClient.initializeORB(AniClient.java:2)
at com.nm.ani.share.aniclient.AniClient.initializeCorba(AniClient.java:33)
at com.nm.ani.share.aniclient.AniClient.initialize(AniClient.java:19)
at com.nm.ani.share.aniclient.AniClient.<init>(AniClient.java:10)
at com.nm.ani.clients.lib.ui.windows.CampusApplet.createA(CampusApplet.java:66)
at com.nm.ani.clients.lib.ui.windows.CampusApplet.getA(CampusApplet.java:68)
at com.nm.ani.clients.campus.main.CampusMain.performAniLogin(CampusMain.java:30)
at com.nm.ani.clients.campus.main.CampusMain.initia(CampusMain.java:6)
at com.nm.ani.clients.lib.ui.windows.CampusApplet.init(CampusApplet.java:17)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.jacorb.orb.ORB
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source
Later i found that applet is searching for jacorb files in endorsed directory itself . It is not using the jar file in windows temp directory in which jars downloaded from the webpage newly.
I have changed every possible code to point to temp directory but it is not happening
please guide me on this...

Applet fails to reload after page refresh or after navigating to same page, getting classNotFoundException second time (after page refresh)

Applet loads and run succesfully for first time but when we goes off the page
and again try to navigate to same page getting class not found Exception.
Using jnlp
exception: JNLP file error: applet-test-applet.jnlp. Please make sure the file exists and check if "codebase" and "href" in the JNLP file are correct..
java.io.FileNotFoundException: JNLP file error: applet-test-applet.jnlp. Please make sure the file exists and check if "codebase" and "href" in the JNLP file are correct.
at sun.plugin2.applet.JNLP2Manager.loadJarFiles(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Exception: java.io.FileNotFoundException: JNLP file error: applet-test-applet.jnlp. Please make sure the file exists and check if "codebase" and "href" in the JNLP file are correct.
Using Jar
load: class com.*.*.uidai.auth.*.class not found.
java.lang.ClassNotFoundException: com.*.cpos.uidai.auth.*.class
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Exception: java.lang.ClassNotFoundException:
Please provide solution

I had the same problem, but in my case was about capturing the URL from the location.href.
When using JSF, the first access wasn't bringing the real page URL, but coincidentally, the applet was there. After clicking a second time, the real page URL would be displayed and the applet jar couldn't be found.
I solved by putting a fixed jar location relative to the base URL, not by the location of the current page.

Java Applet failure

I am running a Java web applet on one of my servers. For some reason a particular user cannot access it (an error text appears in place of the applet that reads "Error. Click for details"; it is not text I placed between the tags, i.e., his JRE is installed and appears to at the very least be installed correctly but for some reason it is not working on my applet.
I think it has something to do with his particular "flavor" of JRE - this so-called "HotSpot" version. (see this: http://www.experts-exchange.com/Programming/Languages/Java/Q_24405442.html if you have an EE account, I can't remember mine offhand). I am not too familiar with Java itself or it's varieties - I am merely the implementer of the applet in the page (I did not write it).
The applet works fine for me, and every single other user to date. Also, it should not be referring to file as listed below in his error such as "http://mywebsite.com/java/JavaVersionDisplayApplet/class.class". The file is located at "http://mywebsite.com/java/JavaVersionDisplay.class". According to the applet programmer, his error points to a file that is not even specified anywhere in his code.
The users' error reads:
Java Plug-in 1.6.0_13
Using JRE version 1.6.0_13 Java HotSpot(TM) Client VM
User home directory = C:Documents and Settingsjohn
load: class JavaVersionDisplayApplet.class not found.
java.lang.ClassNotFoundException: JavaVersionDisplayApplet.class
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
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.io.IOException: open HTTP connection failed:http://mywebsite.com/java/JavaVersionDisplayApplet/class.class
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 7 more
Exception: java.lang.ClassNotFoundException: JavaVersionDisplayApplet.class
load: class JavaVersionDisplayApplet.class not found.
java.lang.ClassNotFoundException: JavaVersionDisplayApplet.class
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:http://mywebsite.com/java/JavaVersionDisplayApplet/class.class
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 7 more
Exception: java.lang.ClassNotFoundException: JavaVersionDisplayApplet.class

I'd start by packaging the application as a jarfile instead of as a set of classfiles. It seems like JavaVersionDisplayApplet.class is being interpreted as a fully-qualified class name...that is, the JVM thinks "JavaVersionDisplayApplet" is a package name and "class" is the class name.
Can you post the contents of the APPLET tag that you're using in the HTML?

A couple of things you might want to look at:
Is he using Chrome? It seems that Chrome and Java don't play well together quite yet.
Is he using a Proxy server? The "connection failed" error may indicate that he is using a Proxy that is allowing the browser through, but not the JRE.

This is the culprit:
Caused by: java.io.IOException: open HTTP connection failed:http://mywebsite.com/java/JavaVersionDisplayApplet/class.class
The JVM is started, but it cannot connect to the server hosting the applet. Does the user connect to mywebsite.com or another name?