Uncaught Exceptions in Clojure
Uncaught exceptions in Clojure sometimes disappear into the void if they happen in a background thread. Fortunately, the JVM provides a hook for adding a default handler.
Tag Archives: clojure
The Clojure Library Ecosystem
Clojure’s library ecosystem can be a source of confusion for new users. This quick overview will help to orient new Clojure programmers to the current state of the library system, with pointers to resources for further information.
Reading BZip2 Files in Clojure
BZip2 compressed files can easily be read in Clojure thanks to Apache Commons Compress. Sample code inside!
Logging in Clojure with clj-logging-config
So your Clojure app wants to write logfiles. It’s easier than it used to be, thanks to Malcom Sparks and his clj-logging-config project. All the messy and utterly static log4j.properties stuff has been wrapped up in a nice dynamic Lisp layer! Here’s how.
Swing-Clojure GUI for the Black-Scholes Option Modeler
Now that we have implemented Black-Scholes in Clojure, let’s make a Swing GUI for it. The Swing GUI will have text boxes for all the necessary inputs, and calculate prices and Greeks when the button is pressed. It’s a simple and straightforward way to get started in Swing GUI programming in Clojure. Here’s what it […]
Black-Scholes in Clojure
The Black-Scholes option pricing model, implemented in Clojure based on the description at Wikipedia and these code samples.
Lazy-spy: Clojure logging/spy for lazy sequences
Clojure.contrib’s log/spy macro does not realize the contents of lazy sequences by default when logging, as they might be infinitely long. If you’re sure that your lazy sequence is finite, you can use this lazy-spy macro to force it to be realized when it’s logged, so that you can inspect the contents.
Log4J and Clojure Configuration
Clojure, Log4J, and clojure.contrib.logging can play nicely together. Here’s a reasonable default configuration.
XML DTD Validation in Clojure: Turning It Off, Parsing Malformed XML
I wanted to parse some externally-generated and malformed HTML, so naturally I went to the short and sweet clojure.xml/parse function. I got a nasty error: error: java.io.IOException: Server returned HTTP response code: 503 for URL: http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd It seems that the W3C blocked access to the DTDs two years ago, but Java still tries to load […]
Randomness with Clojure
Psyleron sells a hardware random number generator and software for experimentation on the interaction of consciousness and randomness. As the Psyleron system only runs on Windows, I wrote some quick Clojure to do experimentation with randomness.