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I was developing an android application in eclipse using ADT plug in.While building my application i had to face this annoying problem "Unable to execute Dex: GC overhead limit exceeded"

Eclipse will throw GC overhead limit exceeded error when it runs out of memory, normally while performing very high memory-consuming operations such as building workspace on  very big projects.
To fix this problem, youll need to allocate more memory to your Eclipse instance. To perform this, follow the following steps-
Step1-locate the eclipse.ini file in your Eclipses installation directory. The content would be something similar to the following :

-startup
plugins/org.eclipse.equinox.launcher_1.3.0.v20130327-1440.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.gtk.linux.x86_64_1.1.200.v20140116-2212
-product
org.eclipse.epp.package.jee.product
--launcher.defaultAction
openFile
-showsplash
org.eclipse.platform
--launcher.XXMaxPermSize
256m
--launcher.defaultAction
openFile
--launcher.appendVmargs
-vmargs
-Dosgi.requiredJavaVersion=1.6
-XX:MaxPermSize=256m
-Xms40m
-Xmx512m

Step2-To increase the memory allocation for your Eclipse instance, edit the number in the following lines accordingly(you may change this as per your requirement).

-Xms512m
-Xmx1024m

These options are passed to Java when launching Eclipse. Xms specifies the initial memory allocation pool, and Xmx specifies maximum memory allocation pool for Java Virtual Machine (JVM). The number is the amount of memory, in Megabytes. You can also increase the value of MaxPermSize, as the following;

-XX:MaxPermSize=1024m

MaxPermSize or Permanent Generation defines the memory allocated to keep compiled class files.

Step3-Restart Eclipse for the changes to take effect

Done! Happy Coding !