The problem

As some background, I’m running the following:

• Jersey 1.15
• Apache Tomcat 7

The specific error that we’re going to fix is:

SEVERE: The following errors and warnings have been detected with resource and/or provider classes:
SEVERE: Missing dependency for method public au.com.your.package.YourResponse au.com.your.package.YourClass.someMethod(au.com.your.package.YourRequest) at parameter at index 0
SEVERE: Method, public au.com.your.package.YourResponse au.com.your.package.YourClass.someMethod(au.com.your.package.YourRequest), annotated with GET of resource, class au.com.your.package.YourClass, is not recognized as valid resource method.

If you’re running Tomcat like I am then you’ll see this in your catalina.out log file.

How to clear the APT cache to fix failing updates.

I came across this problem the other day and thought I’d post up the fix because it’s simple to fix but a show stopper if you can’t.

I’m running Linux Mint 64-bit Cinnamon and Postgres 9.1 as a refenece in case you can’t copy-paste my commands.

Basically, when I copied an already running version of postgres to a new box and it failed to start. When I took a look in the postgres log for when you try to start it, I could see that it was complaining about a missing locale. For me, it was en_AU.UTF-8.

How to ssh-add on a remote machine.

My current infrastructure has an instance of Jenkins as the Continuous Integration server and Sonatype Nexus as the repository manager. The POMs for my project and the settings.xml file for maven are configured so that Jenkins can automatically deploy SNAPSHOTs to the Nexus repository but the problem arose when I had a build that went to production and I needed to deploy that pre-built artifact to Nexus’ RELEASE repository. This was easier that going back and checking out the correct versions of the many dependencies. In the future I’ll use the maven-release-plugin but for now, this is how I solved this problem.

When you generate a Java project using maven and then import it into Eclipse, often you want to add extra directories that are treated as source directories. This guide will show you how to do it.

First lets look at (a snippet of) the Super POM to see what we get by default:

<build>
  <sourceDirectory>src/main/java</sourceDirectory>
  <scriptSourceDirectory>src/main/scripts</scriptSourceDirectory>
  <testSourceDirectory>src/test/java</testSourceDirectory>
  <resources>
    <resource>
      <directory>src/main/resources</directory>
    </resource>
  </resources>
</build>

We can override what we get from here which is probably what you’ll do most of the time; adding another resource directory. When you add another resource remember that you’re overriding the default so if you still want src/main/resources then you’ll have to explicitly add it.

How to eject an ISO when you only have the command line (no GUI).

The problem

My situation is that I run an Ubuntu Server for normal server-like tasks; web server, file server, etc. I decided to install XMBC on it so I could make it into a HTPC because after all, it already had all my media stored on it. Installing XMBC meant that I also had to install Xserver and along with that install, I scored some defaults for screen saver timeout and monitor timeout (all set to 10 minutes) and this really sucks when you’re watching a movie and even 10 minutes the display would turn off unless you gave some input (keyboard, mouse, remote). This guide will show how I fixed it.

This assumes you have vim (the command line text editor) installed. If not, you can use vi or any command line text editor in its place.

1. Change to the modprobe directory:

   cd /etc/modprobe
   

2. We need to create a new blacklist file to store our blacklistings in. If there are already other files in this directory, you can reuse one of them but for the sake of separating configuration you’ve made from the out-of-the-box setup, we’ll create a new file. you can name this file anything you want as long as it ends in a .conf suffix and it would make sense to add blacklist and the type of device you’re blacking list to the name so it’s obvious what things live in there (as the module names might not give this information away). Note that you’ll need to be superuser or sudo and this command requires vim:

   sudo vim blacklist-<deviceType>.conf
   

3. Add one blacklisting per line in the file using the format

   blacklist <module>
   

   for example:

   blacklist pcspkr
   

   If in doubt, have a look in the other blacklist files for examples.
4. Save and exit the file
5. Restart your machine

Credit to: http://ubuntuforums.org/showthread.php?t=1850267

Back story

This is a problem that I ran up against because I was running the host machine as a bare host and all the functionality that I needed was in the guest machine. The purpose of this was to insulate myself from changes in hardware and to be able to easily backup the entire server (the guest) so it could be restored from image. This meant that occasionally I’d need to access files on the guest machine’s “hard drive” but it wasn’t running so methods that require networking were out. The  solution is to mount the guest’s hard drive image on the host to access it like any other partition.