19 Feb 2017
The process of indexing in Solr in an advanced topic covered by many publications. On the most basic level it can be described as putting data into previously prepared containers. But what if user wants to perform additional data processing depending on documents that already are in the index?
31 Oct 2016
Recently, going through the Spring MVC documentation, I found a feature I haven’t previously used - asynchronous request processing. It is an addition of Servlet 3 API and a part of Java EE since its sixth edition from 2009; Spring started support it three years later. As it looks interesting (and as async is a popular word in developer’s journey since at least early Web 2.0 days) I decided to go deeper into details of it.
28 Jun 2016
21 May 2016
Server side request forgery occurs when attacker enters one application and is able to use to it to perform some activity on another application(s). It can be scaning internal network, calling services or making request to another website - our case. Note, that a hacked application would be responsible for an attack - as it produces a call! - not hacker’s machine. More information can be found on numerous sites on the Internet, e.g. here.
10 Apr 2016
The ideal situation is when whole index can be located in memory, due to disk operations are much slower then those in RAM. What’s more, often companies have to fit the requirenments of the tender or reduce server costs, which put pressure on developers to come up with a solution that will make the index smaller.
13 Mar 2016
Recently I had a need to measure Solr memory usage and I decided to use free Oracle tool - VisualVM. As usual an official documentation provides some help, but to make things simpler I extended my Solr startup script for Windows to put all important information in one place.