While using a Ubuntu linux machine, this can happen for a lot of people. This is the solution. Error Message: “Firefox is already running but is not responding …” The problem: Many packages (like firefox) create lock files in your account to prevent database corruption with multiple copies of the application. Look in your account … Read more
Some notes about how to do dynamic analysis on an open source project.
If a project is feasible for dynamic analysis, it needs good available testsuites. Advanced test data generation approaches can be used.
Places to find open source projects:
CodePlex, SourceForge, GitHub, Google Code.
Topics covered in Algorithms class and selective slides from Internet. Josephus Problem Heaps and 2-3 trees slides 1 slides 2 Fibonacci Heaps slides animation Amortized complexity video slides Union/Find – average and worst case slides 1 slides 2 Sorting and selection slides Minimum spanning tree algorithms slides 1 slides 2 NP-completeness – definitions, implications, reductions … Read more
The following are three Java examples for showing what are syntax error, semantic error, and runtime error. Syntactic Error If a program contains syntax error, it will not pass compilation. public static int returnNull(){ System.out.println("haha"); }public static int returnNull(){ System.out.println("haha"); } Semantic Error If a program contains only semantic errors, it means that it can … Read more
In brief, Bridge Design Pattern is a two layer abstraction. The bridge pattern is meant to “decouple an abstraction from its implementation so that the two can vary independently”. The bridge uses encapsulation, aggregation, and can use inheritance to separate responsibilities into different classes. 1. Bridge pattern story The example of TV and Remote Control(typo … Read more
Topics of Compilers are summarized in this hierarchy diagram. Descriptions of some phases
This post starts with the question – how the callback method is called in Eclipse Platform.
Short answer is: call back method is called by host plug-in.
The example used is from a previous post which is about creating a sample plugin with a menu through plug-in wizard. I believe anyone who have played a little bit with plug-in has used it before.
This example shows how IAdaptable is used in Eclipse in a real example. To get a taste of how Adapter design pattern works in Eclipse, go to those posts: post1 post2. Suppose you have created a view by using eclipse “Extension wizard”. (If you do not know this, try to play around and get this … Read more
Adapter Design Pattern How Adapter design pattern is used in Eclipse platform? Eclipse Platform Runtime has a good example of this pattern. First of all, Adapter design pattern has a simple idea behind – wrapping the object and making it to be compatible to another interface clients expect. You can take a look at the … Read more
Adapter pattern is frequently used in modern Java frameworks. It comes into place when you want to use an existing class, and its interface does not match the one you need, or you want to create a reusable class that cooperates with unrelated classes with incompatible interfaces. 1. Adapter pattern story The Adapter idea can … Read more
This code is for showing how to sort a Double LinkedList in Java. You can use sort(List<T> list) method. It will sort the double list in ascending order. If you want to sort it in descending order, you can use sort(List<T> list, Comparator<? super T> c) . public static void main(String[] args) { LinkedList<Double> doubleList … Read more
By using the Eclipse plugin wizard, it takes no time to get a working sample plugin. Here is one I did for getting a menu. How an eclipse plugin works can be illustrated in this simple example. Activator class is the start point of the plugin. Activator class is loaded initially and if you look … Read more
To start the research of frameworks, we need to understand what is a framework and why it is created. Here we only focus on Java frameworks. One of the most significant characters of Frameworks that differ from other regular libraries is called “Reversion of Control”. When we write a java program, there is always a … Read more
Here is a good site about Spring MVC. http://maestric.com/doc/java/spring/hello_world I guess this is the right way to make a tutorial. While there are so many posts out there talking about Spring MVC examples, sample applications or tutorials, there is still a reason to make a new one. This is a good example that can make … Read more
Why do we still need Spring Web Flow while we have good web frameworks already?
Spring Web Flow(SWF) focus entirely on the definition and execution of complex conversation in a web application, i.e. web application page flow.