list1.removeAll(list2); will do the job, but it cost you N1*N2 operations . If you work with big arrays you can improve performance like this: public <T> List<T> subtract(List<T> list1, List<T> list2) { List<T> result = new ArrayList<T>(); Set<T> set2 =...

Previously for obtaining a MAC address we need to use a native code as a solution. In JDK 1.6 a new method is added in the java.net.NetworkInterface class, this method isgetHardwareAddress(). import java.net.InetAddress; import java.net.NetworkInterface; import java.net.SocketException; import java.net.UnknownHostException; public...

To get the real path we first need the servlet context ServletContext ctx = (ServletContext) FacesContext.getCurrentInstance() .getExternalContext().getContext(); After getting the servlet  context now we are able to get the real path String deploymentDirectoryPath = ctx.getRealPath("/");

Quartz Overview Quartz is a full-featured, open source job scheduling service that can be integrated with, or used along side virtually any Java EE or Java SE application – from the smallest stand-alone application to the largest e-commerce system. Quartz can be used to create simple or complex...

Just quick note for anyone getting this error. It took me a little while to figure out. There can a be a various reasons for MySQL errno 150. Following are the ways to verify your structure in order to fix your problem 1) type of foreign key source and reference fields must be identical check: both set...

Identify the Session to be Killed Killing sessions can be very destructive if you kill the wrong session, so be very careful when identifying the session to be killed. If you kill a session belonging to a background process you will cause an instance crash. Identify the offending session using the V$SESSION...

Apache Tomcat has a limit on the size of request that can be made using the POST HTTP method. Some time we need to submit data more than the limit. This article describes how this limit can be removed, enabling very large amount of data to be sent on server. Remove POST size limit If we send large amount...

swfobject.embedSWF("http://www.youtube.com/v/x1ZZ-R3p_w8&rel=0&fs=1&showsearch=0&showinfo=0", "vvq-132-youtube-1", "425", "344", "10", vvqexpressinstall, vvqflashvars, vvqparams, vvqattributes);

Sometime it becomes quite difficult to choose between the JSF AJAX frameworks but based on the following parameters we can choose the best appropriate framework Components Documentation AJAX Integration Browser support Community Tool support (Eclipse, NetBeans) It’s not possible for us to go through...

This error shows up when the page loads (or tries to load). There are many scenarios that can cause this error which occurs in IE. Microsoft has even issued a patch for solving it. This error is being caused by calling a piece of Javascript within a page (after the tag). Adding the defer=”defer”...