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Apache Lucene FlexibleScoring with IndexDocValues

During GoogleSummerOfCode 2011 David Nemeskey, PhD student, proposed to improve Lucene’s scoring architecture and implement some state-of-the-art ranking models with the new framework. Prior to this and in all Lucene versions released so far the Vector-Space Model was tightly bound into Lucene. If you found yourself in a situation where another scoring model worked better for your […]

Debugging the dreaded “SEVERE: Error listenerStart” and “SEVERE: Error filterStart” tomcat error messages

Just a quick post that I hope might benefit others. If you have been developing web applications on tomcat for a while you have likely come the two error messages mentioned in the title. SEVERE: Error listenerStart Occurs when an exception is thrown in the contextInitialized method of a ServletContextListener SEVERE: Error filterStart Occurs when an […]