Today one of my virtual servers suddenly showed up as offline in my New Relic console (Which is an amazing tool and free by the way). I checked the log file /var/log/newrelic/nrsysmond.log and it had these contents: 2015-08-15 02:06:04.512 (915) error: nria_context_
gwt
Today I deep-dived a bit into how GWT creates and reads Serialization Policy files. These are the .gwt.rpc files which are generated beside the JavaScript files for GWT modules. Chiefly, I learned two things: * The .gwt.rpc files are only used by the server. The client never reads them.
gwt
GWT is a very useful tool to compile Java code into JavaScript. Nashorn is Oracle's new JavaScript implementation which runs JavaScript scripts in Java. In order to run JavaScript server-side code within a Java server I now want to make an extensive GWT library available to this JavaScript
javascript
The JVM is by design an insecure environment and it is generally difficult to run untrusted code in a sandboxed environment. However, it seems that is relatively easy to sandbox JavaScript code running in Oracle Nashorn. The instructions are here. Strangely, this was not easy to find through a Google
programming
It seems to me like every time I have to do something that has to do with SSL certificates – be they self-signed or signed by a certificate authority – things do not go smoothly. I only do this from time to time, so I am by no means an expert; but
ssl
IMPORTANT: I found it a lot easier and less error prone to use the GUI tool Portecle to go about generating a SSL certificate/key. You can find my instructions to do so in another post. The following steps show how a RapidSSL certificate obtained through GoGetSSL can be used
productivity
Problem By default, Gmail does not forward email it considers spam even if it's configured to forward all email to a designated address. Solution You can make Gmail forward ALL emails by following these simple steps: 1. Go to settings: 1. Go to Filters and 'Create a
This guide describes how you can unlink a hard disk from Linux/Unix. This might be useful for instance if you replaced a disk image in Virtual Box or another VM. WARNING: Do a backup of your virtual machine first or, if you are running on a physical computer, make
If you have a folder C:\Test and you would like to share it with your Windows Homegroup, you can do so in the Windows Command line (cmd.exe) or in a Batch file with the net share tool. The folder above could be shared with the name "Test&
Good load testing of web and cloud applications should involve many concurrent connections originating from diverse networks. To set up such tests on your own is not trivial and probably very expensive. Thankfully, there are numerous service providers, which allow to use their infrastructure for testing your applications. A few
java
Problem You would like to install Oracle JDK using Puppet. Using the puppetlabs/java module, you might get an error message such as: Error: Java distribution oracle-jdk is not supported. at […]/init.pp:57 on node […] Solution Use the module puppet-jdk-oracle. Just follow the installation instruction from the GitHub page.
mysql
I just spent a fair amount of time setting up MySQL replication between two servers encrypted by SSL (using MySQL 5.1.73). I struggled with fixing a nasty error displayed only as 'ERROR 2026 (HY000): SSL connection error'. In the following, I have collected a few possible
