We ran into a need to increase file descriptors for RabbitMQ running on RHEL 6. The simple solution was to add a file owned by root to /etc/security/limits.d/ 85-rabbitmq.conf # Default limit for rabbitmq which needs more # file handles than the default user settings rabbitmq soft nofile 49152 rabbitmq hard nofile 49152 And after […]
After developing a Glass GDK app for several weeks, I had noticed some warnings on Glass that it needs to cool down to operate properly. At this point I would disconnect the USB cable and power down the device. On one such event everything changed. When I powered on Glass, the device failed to start […]
In November of 2013 I received an invite to join the Google Glass Explorer program. As a long time developer and a recent Android developer I decided to drop the $1500 and get on board. After receiving Google Glass I focused on the product capabilities to truly understand what it can and cannot do. Immediately […]
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OpenJPA and MySQL Timestamps
Reading in MySQL Timestamps that default to ‘0000-00-00 00:00:00’ using JPA can result in errors if your MySQL connection is not properly configured. You may run into an exception such as this: java.sql.SQLException: Cannot convert value ‘0000-00-00 00:00:00’ from column 5 to TIMESTAMP. at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1055) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:926) The solution here is easy enough, […]
One of the difficulties in monitoring a java process using JMX/RMI is the random secondary port opened for the JMX RMI connection objects. This random port can change every time the process is started, and there is no way to configure a firewall to allow this dynamic port to pass through. Fortunately there are some […]
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Windows 7 Review – 2nd day after install
Well this is not a professional review, just some thoughts based on my recent upgrade from Windows Vista 64 on to Windows 7 Professional 64. Now for the background, I’ve been running Vista on my main workstation (Core 2 Duo / 8gb ram) since early 2009. I only had a few issues until the end […]
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Returning a method parameter in JMock
I recently ran into a problem where I needed to test a Java method that dynamically created objects inside. These objects needed to be passed to and returned by a mock service class, but I did not know how to inject this class since it was created inside the method being tested. Here is a […]
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CVS bulk conversion to binary
I try not to use CVS anymore since I’ve become used to Subversion, but recently I needed to restore an old project from CVS. I made a tar of the CVS backup and uploaded to the server and placed it in the CVSROOT folder. When I checked out the project I realized the binary files […]
After installing Continuum 1.1 and Archiva 1.1.1 a number of web pages failed to load throwing exceptions such as javax.el.ELException: Function ‘:empty’ not found. As it turns out, this has to do with Tomcat version 6.0.18 and the EL library that it comes with. As always, when on Linux, a script can fix things and […]
Well it’s Jan 2008 and I decided to run the Plesk 8.3 update and try out the new patch for AWStats previous month history. To my surprise, (well not really) none of the previous month statistics were available, only the current month. So I set out to find a way to generate the history of […]