Essence JCF About a year ago, I considered having configuration files formatted as Java files instead of XML.
This approach has many benefits. The framework is small (15KB), supports pre-compilation, debugging, refactoring, code analysis, performance tuning and all the other tools support you get with regular Java files.
What the framework gives you is runtime compilation and loading. You can even compile and run a class in memory.   more »

I put in an RFE which has been added to the bugs database.
Let me know what you think and ...   more »

Being between jobs, I have a chance to do some open source.

I have written a simple, low latency, high ...   more »

In this article I discuss
Generic as powerful compiler time check for typing rules for method parameters and return values. ...   more »

In this article I discuss
Java is an OO language but it doesn't have a specific array type which is ...   more »

http://www.freshvanilla.org:8080/x/BIAp

The purpose of auto-boxing and un-boxing is to make assignment between primitives and their wrappers simpler. In most cases ...   more »

In this article I look at how you can use the foreach loop for control blocks
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I have been a firm believer that Dependency Injection is a design principle, not a library you include.   more »

In response to a similar article I discuss an approach having Strings auto-compress.
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In this article I go in search of good reasons to include closures in Java. The best reasons I could find were - Closures are cool. - Closures are familiar to those who use functional languages.   more »

In this article I go in search of good reasons to include closures in Java. The best reasons I could find were - Closures are cool. - Closures are familiar to those who use functional languages.   more »

I started by giving simple, intermediate and advanced answers to the same questions.
http://www.freshvanilla.org:8080/display/www/Java+Interview+Questions

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Essence Quant 0.2.0 is a simple quantitative analysis library.
It supports options pricing and multi-threaded Monte Carlo simulations.
It also ...   more »

I recently tried the Java 6 compiler tools and after so head scratching I rather like the idea.
I got ...   more »

Recently, I was struck by the idea of having a IOC, DI container which does not require any libraires at ...   more »

Inspired by an article on hamming numbers which shows a elegent solution in haskell, I thought I might try the same thing in Java ...   more »

I have been busy at work.  But I have also been on holiday to Queensland, moved house and we are about to go to Greece...
I have updated my linkin page.  Any agents out there, check it out, send me a invitation.  Any one else I suggest you set up a page.

Components in Essence are bound to a thread pool. Single threaded components can be bound to a single thread pool, but can coexist with multi-threaded components. Typical applications designed this way use between 1 and 6 threads.   more »

Clustering mean different things to different people. This solution allows you to cluster a collection such as Map, Queue, ConcurrentMap or JCache style Cache and anything it.   more »

It has a sample application Essence JMS 0.70 and an article on testing clustered components , some documentation and it has been added to SourceForge

Essence 0.75 has now been released http://sourceforge.net/projects/essence

Essence is an all in one library. Futher release will have a collection of small libraries to allow you to pick the bits you might want.  The Essence release will be based on those and contain everything it has currently.

This article explores an approach to testing a Component in a clustered environment.  One unit test, tests nodes in the ...   more »

Effective API Design and the slides PDF presentations   more »

I found these interview very interesting... Dr. Kabutz -- How to become a Java Expert (4:43); (JC alumni) Brian Goetz -- Java Concurrency (2:14);  Rod Johnson -- Application of OSGi to the server side (5:58); Kirk Pepperdine -- Mr. Java Performance Tuning (12:27);  Joe Walker -- new features of Reverse AJAX in DWR (18:07);  Mike Cannon-Brookes -- Bamboo: Atlassian's new continuous intergration server (10:04); (JC alumni) Bruno Souza -- What's new with Netbeans (4:07). These are from https://java-champions.dev.java.net/   more »

Recently, to my surprise I discovered that ReentrantReadWriteLock not only didn't support lock upgrading but doesn't throw an exception nor even detect it as a deadlock. If a thread holds a read, the same thread cannot obtain a write lock. So I write utility which can help detect this condition.    more »

In Essence 0.67 has a number of enhancements over version 0.65 Download Essence
- Improved multi-threaded components and logical processes support.
- Improved data serialization for file storage and network transfers. As much as 5x smaller than standard serialization.
- Support for compressed network and file storage.
- Improved memory resource usage and cleanup. Thank you YourKit!
- Fisheye link added.

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I have a method
    public static void include(Callback<Map<String, Map>> onCommit,
        Map<String, Map> changes,
        Callback<Map<String, Map>> onRollback) throws IllegalStateException {

Which updates a map
    private final Map<Callback, Pair<Callback, Map<String, Map>>> allChanges =
        new LinkedHashMap<Callback, Pair<Callback, Map<String, Map>>>();

I could have gone to four nested levels of generics but any more than three is a just scary IMHO.
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# High performance highly available clustering. Essence 0.65 has been tested with 2-way and 4-way mastering (were each update is committed to both or all 4 servers) and persisted to disk in near real time. On a Linux blade, the tests performed 68,000 updates per second and 6.8 million lookups per second concurrently in 2- way durable mastering mode. In 4-way durable mastering mode, the tests performed 31,000 updates per second and 3.1 million lookups per second. Performance test results   more »

Now what it needs is good documentation. Suggestions, offers of help wanted. Good suggestions will be offered a reward via paypal.   more »

A common question about IntelliJ is; why pay for it when Eclipse is free. I would argue there are many reasons to use IntelliJ and one is the quality of the code you produce. I recently ran my default code inspection setting against a reasonable mature project code base. This application is used for enterprise messaging and was developed under eclipse. Is an IDE which makes it easy to run programs which don't compile a good tool to produce quality code... You be the judge. http://www.jtoolkit.org/articles/inspect-code.html   more »

It is worth noting that in Java float/Float is 32-bit and has only 7 digits of precision at best. So basicly don't use them unless your eally need to.   more »

Dolphin is available for download https://jdk7.dev.java.net/ but if you read the list changes they are mostly bug fixes in awt which I would hope will find there way in JDK 6 in any case.   more »

It turned out to be easier than I thought and acts as a web counter of sorts...   more »

Ever wondered where google fine the phrases of words to match in google search as in Mozilla 2.0 All Our N-gram are Belong to You   more »

http://copyscape.com/   more »

Try

System. out.println((Integer) 0 == (Integer) 0);
System. out.println((Integer) 128 != (Integer) 128);

Both return true! I have been reading Joshua Bloch and Neal Gafter?s excellent book Java Puzzler However it feel into the trap that auto boxing treats small numbers differently to large numbers.I have discussed this in more detail in The trouble with auto boxing and small numbers    more »

Some amusing duke graphics   more »

Really funning webcam video I want it that way   more »

This starts slow but he is amzing. Russian Climbing   more »