Category: Programming

Setting up Android in Eclipse, Unable to resolve target ‘android-18’

Posted on by rchapin

When setting up Eclipse for Android development, after you have installed the Develeper Tools and NDK Plugins and linked to the ADT-bundle and then imported your project (see othere posts related by searching for ‘android’) I got the following error:

[2014-03-24 14:14:53 - android_sdk] Unable to resolve target 'android-18'

I went and checked to make sure that the Platform.MinPlatformToolsRev property in the ~/path/to/adt-bundle-linux-x86_64-20131030/sdk/tools/source.properties matched that of my project.properties file.

They were both 18.  Eh?  Why the error?

So, in Eclipse, → Continue reading “Setting up Android in Eclipse, Unable to resolve target ‘android-18’”

Invalid Project Description, project path overlaps the location of another project with the same name When Importing Existing Android Project in Eclipse

Posted on by rchapin

I’ve got a new install of Eclipse and am setting up to do some Android development.

After getting the Develeper Tools and NDK Plugins installed and linking to the ADT-bundle that I downloaded, I was getting an error when attempting to import the existing project by going to File > Import > Android > Existing Android Code Into Workspace.

The error was:

Invalid project description /some/path/to/project/dir_name overlaps the location of another project: dir_name

After a few searches and a couple → Continue reading “Invalid Project Description, project path overlaps the location of another project with the same name When Importing Existing Android Project in Eclipse”

Creating a Beep from a Command Line or Shell Script

Posted on by rchapin

If you have a long-running command on shell-script that you want to generate a beep upon completion on your PC running Linux do the following:

Make sure that the pcspkr module is loaded:

# modprobe pcspkr

Then create a wrapper shell script that looks something like this:

#!/bin/bash

# Some long running command here . . .

echo -e '\a' /dev/console
→ Continue reading “Creating a Beep from a Command Line or Shell Script”

Eclipse Crashing with SIGSEGV, Problematic Frame libgdk and/or libsoup Problem Solved

Posted on by rchapin

I’m setting up a new workstation under Fedora Core 20 and getting my dev environment set up.

I had copied over my /opt dir from my old machine which included an older version of Eclipse (3.8.2) that I had been using.  That version wasn’t behaving very well and I decided to go with the latest and greatest stable version (Kepler, 4.3.1).

Unfortunately, Kepler was dumping core with the following error:

 A fatal error has been detected by the Java Runtime → Continue reading “Eclipse Crashing with SIGSEGV, Problematic Frame libgdk and/or libsoup Problem Solved”

Excellent Example and Explanation on How to Inject Properties from an External Properties File from Outside of a WAR in a Spring Application

Posted on by rchapin

I am doing some refactoring on a Spring MVC application, pulling out configuration data and login crentials from the spring.xml file.

What I want to do is to consolodate sensitive data into external .properties files that can be read, at runtime by the app and not require recompiling the war to make changes.

Thanks to Ben Northrop and Summa Technologies for such a clear, concise and well written article.

The long and the short of it (copied from the → Continue reading “Excellent Example and Explanation on How to Inject Properties from an External Properties File from Outside of a WAR in a Spring Application”

Executing Dynamically Generated SQL Queries in a Shell Script and Saving the Output to a Variable

Posted on by rchapin

If you would like to, in a shell script, dynamically generate SQL queries for MySQL and save the output of those queries to a variable that you can then use in the script, here is an example:

#!/bin/bash

for i in `cat tables_list.txt`
do

   # Build the query
   QUERY="SELECT count(*) FROM ${i}"

   # Run the query from the command-line and save the
   # output into the $ROW_COUNT variable
   ROW_COUNT=$(echo $QUERY | mysql -u${USER_NAME} -p${PASSWORD} -h ${HOST} -P ${PORT} --skip-column-names ${DBASE})

  
→ Continue reading “Executing Dynamically Generated SQL Queries in a Shell Script and Saving the Output to a Variable”

Executing Dynamically Generated SQL Queries from a Shell Script

Posted on by rchapin

Following is how to generate dynamic SQL in a shell script and then execute those queries.

Let’s say, for instance, that you have a list of tables that you want to flush regularly during development and don’t want to type in the SQL queries each time.  Moreover, you just want to maintain a list of the table names and add and remove from it when necessary and have your script dynamically generate and execute the delete statements.

For the purposes → Continue reading “Executing Dynamically Generated SQL Queries from a Shell Script”

Setting Up Android SDK and Plugin in an Existing Install of Eclipse

Posted on by rchapin

To set up an existing install of Eclipse to do some Android development do the following:

  • Go to http://developer.android.com/sdk/index.html and look for and download the ADT bundle for your OS (in my case I was using Fedora Core 18 at the time)
  • Unpack it as the user that is going to be running Eclipse and/or after you unpack it make sure that your user has read/write/execute permissons for the files in this directory (obviously, you don’t need execute permssion for
→ Continue reading “Setting Up Android SDK and Plugin in an Existing Install of Eclipse”

Do Not Use Symlinks in Jetty’s webapps Directory

Posted on by rchapin

I set up a development instance of Jetty on my local machine and have been happily coding, compiling and deploying via a shell script.  The script copies the war from my user’s target directory to the jetty users’s home dir changes the permissions and then moves it to the /webapp dir creating a symlink to the name of the .war that is referenced in a number of config files.

This was working just fine until I did a merge with → Continue reading “Do Not Use Symlinks in Jetty’s webapps Directory”

© 2005 Ryan Chapin