Thursday, October 18, 2012
java.lang.VerifyError: Cannot inherit from final class
Problem: "java.lang.VerifyError: Cannot inherit from final class" Error seen in JBOSS Server.log file.
2012-10-09 12:47:47,886 WARN [org.jboss.detailed.classloader.ClassLoaderManager] (MT-AIR_XMLRPC_02) Unexpected error during load of:org.apache.http.params.SyncBasicHttpParams
java.lang.VerifyError: Cannot inherit from final class
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
at org.jboss.classloader.spi.base.BaseClassLoader.access$200(BaseClassLoader.java:63)
at org.jboss.classloader.spi.base.BaseClassLoader$2.run(BaseClassLoader.java:572)
at org.jboss.classloader.spi.base.BaseClassLoader$2.run(BaseClassLoader.java:532)
at java.security.AccessController.doPrivileged(Native Method)
at org.jboss.classloader.spi.base.BaseClassLoader.loadClassLocally(BaseClassLoader.java:530)
at org.jboss.classloader.spi.base.BaseClassLoader.loadClassLocally(BaseClassLoader.java:507)
at org.jboss.classloader.spi.base.BaseDelegateLoader.loadClass(BaseDelegateLoader.java:134)
at org.jboss.classloader.spi.filter.FilteredDelegateLoader.loadClass(FilteredDelegateLoader.java:131)
at org.jboss.classloader.spi.base.ClassLoadingTask$ThreadTask.run(ClassLoadingTask.java:452)
at org.jboss.classloader.spi.base.ClassLoaderManager.nextTask(ClassLoaderManager.java:251)
at org.jboss.classloader.spi.base.ClassLoaderManager.process(ClassLoaderManager.java:150)
at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:265)
at org.jboss.classloader.spi.base.BaseClassLoaderDomain.loadClass(BaseClassLoaderDomain.java:1119)
at org.jboss.classloader.spi.base.BaseClassLoader.loadClassFromDomain(BaseClassLoader.java:798)
at org.jboss.classloader.spi.base.BaseClassLoader.loadClass(BaseClassLoader.java:441)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at org.apache.http.impl.client.DefaultHttpClient.createHttpParams(DefaultHttpClient.java:161)
at org.apache.http.impl.client.AbstractHttpClient.getParams(AbstractHttpClient.java:426)
at org.apache.xmlrpc.XmlRpcHttpClient.setConnectTimeout(XmlRpcHttpClient.java:306)
Solution: java.lang.VerifyError comes when a component is not able to identify the jar file at the run time. Check on your server, if you have two different jars of different versions for the same component.
(HDScanner) Scan failed problem in JBOSS Application Server
Problem: When does the problem of (HDScanner) Scan failed comes with below kind of JBOSS Server.log
2012-10-15 06:51:59,343 WARN [org.jboss.system.server.profileservice.hotdeploy.HDScanner] (HDScanner) Scan failed
java.io.IOException: Error listing files: /opt/jboss-5.1.0.GA/server/prod-deploy/tmp/3j001-okh8ua-h8b3sdna-1-h8b3srrc-t/admin-console.war
at org.jboss.virtual.plugins.context.file.FileHandler.getChildren(FileHandler.java:225)
at org.jboss.virtual.plugins.context.AbstractVFSContext.getChildren(AbstractVFSContext.java:219)
at org.jboss.virtual.plugins.context.AbstractVFSContext.visit(AbstractVFSContext.java:336)
at org.jboss.virtual.plugins.context.AbstractVFSContext.visit(AbstractVFSContext.java:306)
at org.jboss.virtual.VFS.visit(VFS.java:421)
at org.jboss.virtual.VirtualFile.visit(VirtualFile.java:437)
at org.jboss.deployers.vfs.spi.structure.modified.SynchWrapperModificationChecker.hasStructureBeenModifed(SynchWrapperModificationChecker.java:90)
at org.jboss.deployers.vfs.spi.structure.modified.AbstractStructureModificationChecker.hasStructureBeenModified(AbstractStructureModificationChecker.java:195)
at org.jboss.deployers.vfs.spi.structure.modified.AbstractStructureModificationChecker.hasStructureBeenModified(AbstractStructureModificationChecker.java:138)
at org.jboss.system.server.profileservice.repository.HotDeploymentRepository.getModifiedDeployments(HotDeploymentRepository.java:120)
at org.jboss.system.server.profile.repository.AbstractProfile.getModifiedDeployments(AbstractProfile.java:128)
at org.jboss.system.server.profileservice.hotdeploy.HDScanner.scan(HDScanner.java:336)
at org.jboss.system.server.profileservice.hotdeploy.HDScanner.run(HDScanner.java:255)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:181)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:205)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Solution: This problem occurs when data from <JBOSS_DIR>/server/default/tmp is removed at the run time, means at the time when application is running and data from this directory is removed, then JBOSS Server won't be able to serve any request coming and above error messages will be seen in the JBOSS Server.log file.
Internet Explorer has encountered a problem - bhoclass.dll error
Problem:
Internet Explorer has encountered a problem with an add-on and needs to close.
The following add-on was running when this problem occured:
Add-on Name : bhoclass.dll
Company Name:
Description: IEPlugin
Solution:
Uninstall codecv program.
Change extension of all files in a directory in windows
change extn of all files in current dir to pdf using comamnd:
ren * *.pdf
change extn of all files in current dir to xml using command:
ren * *.xml
change extn of all files in current directory having extn txt to extn xml using command:
ren *.txt *.xml
Sunday, March 20, 2011
Lock a folder in Windows without using any software
lock any folder in XP
Lock any folder without using any software. Just Follow these steps:
1. Suppose you have a folder named abcd in D:\abcd.
2. In the same drive next to the folder create a new notepad file with the exact statement
ren abcd abcd.{21EC2020-3AEA-1069-A2DD-08002B30309D}
3. Now save this text file as loc.bat
4. Create another notepad file and type
ren abcd.{21EC2020-3AEA-1069-A2DD-08002B30309D} abcd
5. Save this as key.bat
6. Now there are two batch files. Double click loc.bat and your folder will change into Control Panel and its contents cannot be viewed .
7. To open the folder double click key.bat and you get back your original folder.
8. For more safety keep the key.bat in another location . Only for unlocking copy paste to the original location and double click..
(don't forget to replace abcd with the folder name)
Ref:- http://sites.google.com/site/mukeshkmrgarg/lock-folder
Lock any folder without using any software. Just Follow these steps:
1. Suppose you have a folder named abcd in D:\abcd.
2. In the same drive next to the folder create a new notepad file with the exact statement
ren abcd abcd.{21EC2020-3AEA-1069-A2DD-08002B30309D}
3. Now save this text file as loc.bat
4. Create another notepad file and type
ren abcd.{21EC2020-3AEA-1069-A2DD-08002B30309D} abcd
5. Save this as key.bat
6. Now there are two batch files. Double click loc.bat and your folder will change into Control Panel and its contents cannot be viewed .
7. To open the folder double click key.bat and you get back your original folder.
8. For more safety keep the key.bat in another location . Only for unlocking copy paste to the original location and double click..
(don't forget to replace abcd with the folder name)
Ref:- http://sites.google.com/site/mukeshkmrgarg/lock-folder
Microsoft isn't evil...
"Microsoft isn't evil, they just make really crappy operating systems.".....Linus Torvalds
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