Apache Lucene - Scoring

There are 3 types of score boosting:

Score Boosting [1]

Lucene allows influencing search results by "boosting" in more than one level:

• Document level boosting - while indexing - by calling document.setBoost() before a document is added to the index.
• Document's Field level boosting - while indexing - by calling field.setBoost() before adding a field to the document (and before adding the document to the index).
• Query level boosting * - during search, by setting a boost on a query clause, calling Query.setBoost(). 

* For dismax type in query level boosting, it is need to specify boosts on fields in parameter qf [2].


[1] http://lucene.apache.org/core/3_6_0/scoring.html#Score%20Boosting 
[2] http://wiki.apache.org/solr/SolrRelevancyFAQ#How_can_I_make_.22superman.22_in_the_title_field_score_higher_than_in_the_subject_field 

log4j performance

Aiming better performance, in log4j 1.2 [1], you can use:

if(logger.isDebugEnabled() {
    logger.debug("Entry number: " + i + " is " + String.valueOf(entry[i]));
}

instead

logger.debug("Entry number: " + i + " is " + String.valueOf(entry[i]));

In log4j 2 [2], you can use the new feature

logger.debug("Entry number: {} is {}", i, entry[i]);

References

[1] http://logging.apache.org/log4j/1.2/manual.html
[2] http://logging.apache.org/log4j/2.x/performance.html

SOLR Tokenizers, Filters and Analyzers

http://lucidworks.lucidimagination.com/display/solr/Apache+Solr+Reference+Guide

http://wiki.apache.org/solr/AnalyzersTokenizersTokenFilters/

http://lucidworks.lucidimagination.com/display/solr/Filter+Descriptions 

http://lucidworks.lucidimagination.com/display/solr/Understanding+Analyzers%2C+Tokenizers%2C+and+Filters

http://lucidworks.lucidimagination.com/display/solr/Tokenizers

Expression Language - Java EE 6

http://docs.oracle.com/javaee/6/tutorial/doc/bnahu.html
http://download.oracle.com/otndocs/jcp/expression_language-2.2-mrel-eval-oth-JSpec/

a4j:repeat rowKeyVar

rowKeyVar

Examples of GoF Design Patterns

Examples of GoF Design Patterns [closed]
http://stackoverflow.com/questions/1673841/examples-of-gof-design-patterns/2707195#2707195

XML in Java and XML Identing

How to create XML file in Java – (DOM Parser)
http://www.mkyong.com/java/how-to-create-xml-file-in-java-dom/

Indenting XML Output in Java
http://techxplorer.com/2010/05/20/indenting-xml-output-in-java/

Icon vs Text

When use Icons? When use Text?

[1] As rule of thumb, icons alone should only be permitted when at least two out of the following three conditions apply:

1. Space is very limited (i.e., too small for text alone).
2. The icons are standardized (e.g., the floppy disk image for save)
3. The icon represents an object with a strong physical analog or a visual attribute (e.g., a printer icon to access printer attributes, or a red rectangle to set a page background red).
   

[1] http://ux.stackexchange.com/questions/1795/when-to-use-icons-vs-icons-with-text-vs-just-text-links
[2] http://designaday.tumblr.com/post/91812707/back-to-basics-icons-vs-text
[3] http://www.ixda.org/node/19518 
[4] http://uxmyths.com/post/715009009/myth-icons-enhance-usability
[5] http://www.smallfarmdesign.com/blog/2009/12/28/the-problem-with-icons/
[6] http://blogs.msdn.com/b/jensenh/archive/2005/11/01/487661.aspx

Managing SQLite Database - SQLite Expert Personal

This is a free and a great SQLite database manager. It also manages the Android SQLite database easily.

SQLite Expert Personal
http://www.sqliteexpert.com/

JBoss Envers and Temporal Databases

It can be used in need of Temporal Databases[1]... It is a great option for historic data!

Envers: Easy Entity Auditing
"The Envers project aims to enable easy auditing/versioning of persistent classes. All that you have to do is annotate your persistent class or some of its properties, that you want to audit, with @Audited. For each audited entity, a table will be created, which will hold the history of changes made to the entity. You can then retrieve and query historical data without much effort." [2]

[1] http://en.wikipedia.org/wiki/Temporal_database
[2] http://www.jboss.org/envers