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Java Jirawat: JEE Webapp Troubleshooting Tool

http://www.javajirawat.com/2014/01/jee-webapp-troubleshooting-tool.html

Jirawat Uttayaya JEE Notebook. JEE Webapp Troubleshooting Tool. To help troubleshoot a web application, it is useful to print out information about the JEE server and the HTTP request. I created a JSP page called serverinfo.jsp to display information about the server, Java memory, classpath, HTTP Session, and cookie. I have used this tool numerous times in production to troubleshoot issues with load balancing, dropped sessions, bad cookies, and OutOfMemoryExceptions. The source code is on GitHub.

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Java Jirawat: June 2013

http://www.javajirawat.com/2013_06_01_archive.html

Jirawat Uttayaya JEE Notebook. Given a file with a set of unique (non-repeating) integers from 1 to 1,0000,000 , how would you sort it? For example, if the input file contained. The output should be. This is one of my favorite interview questions since it shows how the interviewee approaches a fairly simple and common sorting problem. The best answer in my opinion is to use a bit array. 1 Initialize a bit array to a size of 1,000,000 with all the values of 0. 2 Read each number from the file. This questi...

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Java Jirawat: January 2013

http://www.javajirawat.com/2013_01_01_archive.html

Jirawat Uttayaya JEE Notebook. Android Mac Command Line. 1) Launch Android SDK Manager to download additional libraries and SDK versions. ANDROID SDK PATH/tools/android sdk. 2) List Android SDK targets to create AVD (Android Virtual Devices). ANDROID SDK PATH/tools/android list targets. ANDROID SDK PATH/tools/android create avd -n avdName. 4) Start the AVD emulator. ANDROID SDK PATH/tools/emulator -avd avdName. 5) Generate Android project build.xml if missing. 7) Install Android on emulator. This shows m...

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Java Jirawat: Built-in Android ListView layouts: Part 2

http://www.javajirawat.com/2013/03/built-in-android-listview-layouts-part-2.html

Jirawat Uttayaya JEE Notebook. Built-in Android ListView layouts: Part 2. See Part 1 here. Android has several built-in ListView layouts. That you can easily use without defining your own layout XML. The source code needs cleanup and better documentation but it should give you an idea how to use the built-in layout. Android.R.layout.simple list item activated 1. Xml version="1.0" encoding="utf-8"? Android:attr/textAppearanceListItemSmall" android:gravity="center vertical" android:paddingStart= "? Android...

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Java Jirawat: Interesting development articles

http://www.javajirawat.com/2014/01/interesting-development-articles.html

Jirawat Uttayaya JEE Notebook. My evolving online bookmarks of interesting articles about software development. Law of Leaky Abstractions. 13 Laws of Highly Complex Systems. Domain Driven Design Quickly. Who needs an architect? Subscribe to: Post Comments (Atom). Android ListView Tutorial: simple list item 2 and SimpleAdapter. How to build an offline Karaf server. Built-in Android ListView layouts: Part 2. Null safe for-each loop. DDD: Application File Structure. How to add a new user/schema in Oracle.

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Java Jirawat: DDD: Application File Structure

http://www.javajirawat.com/2013/05/ddd-application-file-structure.html

Jirawat Uttayaya JEE Notebook. DDD: Application File Structure. I am a fan of Domain Driven Design. The following is how I structure Java applications to support DDD concepts. The domain layer is core of DDD. It contains the business objects state, behavior, and interaction. The domain object source code is contained in the the base.package.domain package, e.g. com.jirawat.myappname.domain package. If an class is an aggregate root, it is further documented in that class Javadoc. To programmatically e...

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Java Jirawat: February 2013

http://www.javajirawat.com/2013_02_01_archive.html

Jirawat Uttayaya JEE Notebook. Eliminate JavaScript global variables. Global variables in JavaScript can be overwritten, resulting in bugs. For example,. Var counter = 0;. Alert("Counter is " counter);. Input type="button" value="Increase Counter" onclick="increaseCounter();" /. Will output "Counter is NaN" when the button is clicked. Global variables in JavaScript can be eliminated by closures. For example the previous JavaScript can be refactored as,. Var CounterJS = (function() {. Var counter = 0;.

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Java Jirawat: November 2013

http://www.javajirawat.com/2013_11_01_archive.html

Jirawat Uttayaya JEE Notebook. WebLogic Server 12.1.2 and IntelliJ IDEA 11 not working. I performed a new install of WebLogic 12.1.2 on my Mac OSX. I could not get IntelliJ IDEA 11 to add it as a valid Application Server. The error I got was "Warning: Directory is not BEA home". The new WebLogic 12.1.2 no longer creates registry.xml in the WebLogic home directory. This file had been created by WebLogic since at least version 8. Even WebLogic 12.1.1 created registry.xml. The contents of registry.xml.

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Java Jirawat: May 2013

http://www.javajirawat.com/2013_05_01_archive.html

Jirawat Uttayaya JEE Notebook. Convert InputStream to String in two lines of code. Below is code to convert from java.io.InputStream into a String in just two line of Java 5 code. Public static String convertToString(InputStream in) {. Javautil.Scanner s = new java.util.Scanner(in).useDelimiter(" A");. Snext() : " ;. Idea taken from "Stupid Scanner tricks". DDD: Application File Structure. I am a fan of Domain Driven Design. The following is how I structure Java applications to support DDD concepts.