causes of pvcs

can occur if the same class name is present under different package structures.The solution is as follows:1. Write a class to implement the Org.springframework.beans.factory.support.BeanNameGeneraot interfacepublic class Uniquenamegenerator extends Annotationbeannamegenerator { @Override public String Generatebeanname (beandefinition definition, beandefinitionregistry registry) { //Fully qualified class name String beanname = Definition.getbeanclassname (); return bea

Com.bea.core.repackaged.aspectj.internal.lang.reflect.AjTypeImpl;Import java.lang.ref.WeakReference;Import java.util.Collections;Import Java.util.Map;Import Java.util.WeakHashMap;public class Ajtypesystem {private static Map. Synchronizedmap (New Weakhashmap ());public static WeakReference localweakreference = (weakreference) ajtypes. get (Paramclass);if (localweakreference! = null) {Localobject = (ajtype) localweakreference.get ();if (localobject! = null)return localobject;Localobject = new A

Web. XML configuration file, configuration SPRINGMVC:Controller class Method:......@RequestMapping ("/checkuser")Public String checkmemberuser (httpservletrequest req,httpservletresponse Res){System.out.println ("Useraction" +userser.checkuser ()); This will work properly and the console outputsReturn "index";//After adding the * number cannot jump to the index.jsp page}The correct one should be: Remove the * number will be normal operation, you can jump to the specified page. Web. XML configura

->nullP2:oldtable[i]->a1->a2->nullThe thread P1 runs to (1) below this line, E=A1 (A1.NEXT=A2), continues to run until (2), next=a2. This time switch to thread P2, thread P2 execute the loop of this list. If the hash value of the A1,A2 in the new table is the same, then the list order at this time is:Main Memory: Newtable[i]->a2->a1->nullNote that this time, the A1,A2 connection sequence is reversed. Now the CPU is re-P1, after (3) this line: E.next = Newtable[i]; that is: a1.next=newtable[i];NE

The test server needs to be load balanced, using Nginx+tomcat.After the load balancer configuration is successful, the session synchronization is configured with memcached. A total of 4 servers, three servers successfully configured successful, the last server can not be shared.The process of solving this problem is tortuous and is not limited to the following operations.Rebooting the systemCheck the rational configuration countless timesRedeploy an appReplicate normal host application to native

Original address: http://www.2cto.com/os/201504/395229.html Environment: Redhat 6.4 oracle11g RAC You need to shut down the operating system's firewall and SELinux before installing oracle11g. 1. Shut down firewall: iptables-f ———————————— Clear Firewall Policy Service iptables stop ——————— shut down the Firewall service Chkconfig iptables off —————— Disable Firewall service from booting 2. Turn off SELinux The value of the "SELinux" parameter in the confi

daily summary of process accounting at 23:5353 * * * ROOT/USR /lib/sa/sa2-a >/dev/null Ten, again with the top command to view the process only more than 100, monitoring the alarm disappears, the problem is done![[Email protected] cron.d]# service SendMail restartsendmail:unrecognized service[[email protected] cron.d]# toptop-10: 43:12 up 184 days, 20:37, 2 users, load average:1.03, 1.54, 14.15tasks:105 Total, 1 running, 104 sleeping, 0 stopped, 0 zombiecpu (s): 43.4%us, 1.3%sy, 0.0

New employees need to install the ubuntu12.04 and Android 5.0 compilation environment.Its own operations have run over apt-get-y update and upgrade.I installed the Gdm,dpkg-reconfigure GDM, selected GDM. The default is LIGHTGDM.After restarting, there are problems with the same error.To solve this problem, from the Internet search scheme (put to the last), does not work, the middle change back to the LIGHTGDM login. Method of Adoption:Apt-get-y Remove xserver-xorgApt-get-y Install xserver-xorgYo

;a2->nullP2:oldtable[i]->a1->a2->nullThe thread P1 runs to (1) below this line, E=A1 (A1.NEXT=A2), continues to run until (2), next=a2. This time switch to thread P2, thread P2 execute the loop of this list. If the hash value of the A1,A2 in the new table is the same, then the list order at this time is:Main Memory: Newtable[i]->a2->a1->nullNote that this time, the A1,A2 connection sequence is reversed. Now the CPU is re-P1, after (3) this line:E.next = Newtable[i];namely: A1.next=newtable[i];NE

e325:attention file "******** " ******* Press ENTER or type command to continueThe reason is that in the VI or VIM operation before the use of VI or VIM operation of the file with an abnormal interruption, so in the current directory produced a. ****.swp file, this file using the LS command to view can not be found, use the ls-a command to see what is known as a hidden file.To remove the above warning, delete the fileLinux under VI or VIM operation found a swap file by the name

(service iptables Save), Check to verify that the existing and pre-export configuration is different, the existing repair, and finally restart the Iptables services (service iptables restart);2, check whether the IP configuration of each machine changes (ifconfig), whether the same network segment, if the configuration changes, then change back to the original configuration, restart the Network Service (service network restart);After the above network problem is resolved, execute Mount Target_h

Causes of library cache latchThe library cache latches protect the cached SQL statements and objects ' definitions heldIn the library cache within the shared pool. The library cache latch must be acquiredIn order to add a new statement to the library cache. During a parse, Oracle searchesThe library cache for a matching statement. If one is not found and then Oracle would parseThe SQL statement, obtain the library cache latch and insert the new SQL.Th

I ' m new to the use Vagrant, today upgraded the next vbox in the ubuntu12.04 kernel, the results vagrant reload after the error.Failed to mount folders in Linux Guest. This is usually becauseThe "vboxsf" file system is not available. Verify thatThe guest additions is properly installed in the guest andcan work properly. The command attempted was:Mount-t vboxsf-o uid=id-u vagrant,gid=getent Group vagrant | cut-d:-f3 vagrant/vagrantMount-t vboxsf-o uid=id-u vagrant,gid=id-g vagrant vagrant/vagran

WIN8 System Account password error causes unable to exit Safe mode how to do? Here are some solutions for you. Workaround: 1, first restart the WIN8 system computer, and then see if the WIN8 system computer can also log on to the operating system normally. If you cannot log on to the system, you need to force the computer to shut down three times, then select "Troubleshoot" when the computer automatically appears advanced mode, then expand th

　Cause one, registry damage caused panic Phenomenon Analysis: Registry management System important resources, is a very dangerous place, under normal circumstances, do not arbitrarily modify, once the wrong operation, very easy to cause data damage caused by the crash problem WORKAROUND: If there is a problem, you can restore the backup registry back. To do this: start your computer to a pure DOS state, go to the Windows directory, execute the following commands, restart your computer when you

Win7 system footstep Setup problems causing Web page content to not replicate solution Find information on the Internet to see important information, many users use direct copy and paste method to save, fast and convenient record. Many users encounter the phenomenon that when you want to copy text on a Web site, the pop-up prompts "cannot copy" is annoying. It is not always possible to input a single word, so the efficiency is very low. What the hell is going on? Many of the Web pages may be li

Three causes and solutions of slow running speed of Win7 system The specific steps are as follows: 1, believe that many users in their own computer installed are not Microsoft's genuine system, it is likely that the computer system is bound to some of the software or services caused by the software, although said to be able to uninstall, but the speed of the computer operation has caused a certain impact, All here is a small set of suggestions to

Original: IE10, IE11 user-agent caused the ASP to write cookie problem　　Have you ever experienced the use of a Web site or management system that involves cookie manipulation, IE 6, 7, 8, 9 run well, only to the IE10, 11 these high-version browser is not? Well, the problem is that the farmer has met 2 times in 2 consecutive days. So, let's take a look at the causes and consequences of this problem.First of all, this 2 times the use of the scene, one i

The first point to note is: ORA-01555 error is a "safe" error, it will not cause data loss or corruption, but will allow the query to receive the error can not continue, therefore, in the day-to-day maintenance of the database, if only two times to encounter ORA-01555 errors, generally ignored, However, if you frequently encounter this error, make some adjustments to avoid the recurrence of the error. 1. Why are ORA-01555 errors generated? This error is caused by the read consistency of the da

What if the Win7 system loses MSVCP100.dll causes the program not to start? Steps: 1, open the browser, in the address bar input "WWW.MICROSOFT.COM/ZH-CN" to open the official website of Microsoft China; 2, open the page in the window to the right search box input "VC + + 2010", and then click on the right side of the search button; 3, click the search out the first link; 4, select the installation language i