Welcome to northCoder

a blind man in a dark cellar looking for a black cat that isn't there

Drawing Shapes on an HTML Image with a Canvas

10 Nov 2021
A look at how to draw shapes onto an image displayed in an HTML canvas. Also, how to display those shapes with rollovers and via links.
html image canvas javascript jquery

Class Loaders, Data Sources, Service Providers and JDBC

08 Nov 2021
What starts out as a simple question (where do I put my JDBC drivers in Tomcat?) quickly leads down a rabbit hole…
jdbc class-loader driver-manager data-source spi tomcat jndi

More on Lucene Classic Queries

27 Aug 2021
Notes on the Lucene Classic Query Parser and its Syntax
lucene classic parser

Custom Sorting and Column Types in DataTables

22 Jun 2021
What if we have certain values in a column (e.g. blanks/nulls) which should always be sorted to the end of the listing, regardless of whether the sort order is ascending or descending?
datatables sort sorting custom

Lucene Proximity Searches

17 Jun 2021
Unconfusing myself about Lucene’s proximity search functionality.
lucene proximity edit-distance distance slop

Sticky Examples

16 Jun 2021
The power of simple examples in support of good design practices…
api design

Jakarta REST (JAX-RS) on Tomcat 10

22 May 2021
Notes on setting up a REST service on Tomcat 10 using JAX-RS and Jersey
jakarta rest tomcat jax-rs jersey

Wrong and Wrong Again

21 May 2021
Because terminology is important.
ternary modulo

Exporting to Excel from DataTables

01 May 2021
Some links and reference notes relating to the jQuery DataTables library, and its ability to export table data to Excel.
datatables jquery javascript excel

JSON from a String

25 Apr 2021
Note to self: Quick ways to create an arbitrary JSON object from a string. Useful when testing.
json jackson gson javalin java
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