We are using Oracle Weblogic 10.3 as our application server. We have multiple modules that need to access an Object (contains some HashMaps) that is common for the managed server. This object will be populated via some other process on a daily basis. We do not want to have copies of this in each application, …
Parsing command-line arguments from a STRING in Clojure
I’m in a situation where I need to parse arguments from a string in the same way that they would be parsed if provided on the command-line to a Java/Clojure application. For example, I need to turn “foo “bar baz” ‘fooy barish’ foo” into (“foo” “bar b…
Spring: Using builder pattern to create a bean
I use ektorp to connect to CouchDB. The way to build an ektorp HttpClient instance is to use builder pattern: I am relatively new to Spring. Please advice me on how I can configure an HttpClient in my context to create it via the Builder. One way to do this is with @Configuration. Are any other options? Answe…
Performance in Java through code? [closed]
First of all I should mention that I’m aware of the fact that performance optimizations can be very project specific. I’m mostly not facing these special issues right now. I’m facing a bunch of …
I don’t understand the purpose of the src folder and separate packages
I’ve been using Eclipse only for Python over the last few months, and I’d like to start using it for Java. However, according to the tutorials I’ve looked at, the proper way to organize your Java project is to create a package in the source folder named, for example, com.project, and have al…
Crop image to smallest size by removing transparent pixels in java
I have a sprite sheet which has each image centered in a 32×32 cell. The actual images are not 32×32, but slightly smaller. What I’d like to do is take a cell and crop the transparent pixels so the image is as small as it can be. How would I do that in Java (JDK 6)? Here is an example
Comparing Numbers in Java
In Java, all numeric types extend from java.lang.Number. Would it be a good idea to have a method like the following: I’m concerned about cases where a double 2.00000 does not equal an int 2. Are these handled by the built-in equals? If not, is there any way to write a simple number compare function in …
Unit testing mathematical code
I am writing a small utility for calculating a complicated mathematical formula (using commons-math library for integration and root finding). I was trying to write it in the same way as a normal …
What is the convention for word separator in Java package names?
How should one separate words in package names? Which of the following are correct? com.stackoverflow.my_package (Snake Case using underscore) com.stackoverflow.my-package (Kebab Case using hyphens) com.stackoverflow.myPackage (Camel Case) com.stackoverflow.MyPackage (Pascal Case) What is the general standard…
Java : convert List of Bytes to array of bytes
Trying to solve what should be a simple problem. Got a list of Bytes, want to convert it at the end of a function to an array of bytes. compiler doesn’t like syntax on my toArray. How to fix this? Answer The compiler doesn’t like it, because byte[] isn’t Byte[]. What you can do is use common…