As 
previously announced, the 
old Java library for AdWords and DFP APIs have now been deprecated and support for new API releases won’t be added after the end of 2013.
We’d like to remind you of some important features you will benefit from by migrating to the 
new Java library.
OAuth2 support
The new Java library supports OAuth2, which is the recommended authentication mechanism at Google. As we mentioned in our 
previous post, there are many benefits to using OAuth2 and ClientLogin will be eventually 
sunset.
Maven support
The new Java library is hosted on Maven, which manages jar dependencies through its pom.xml instead of managing a lot of jars manually.
<dependency>
  <groupId>com.google.api-ads</groupId>
  <artifactId>ads-lib</artifactId>
  <version>RELEASE</version>
</dependency>
<dependency>
  <groupId>com.google.api-ads</groupId>
  <artifactId>adwords-axis</artifactId>
  <version>RELEASE</version>
</dependency>
Note: See this 
pom.xml for AdWords or this 
pom.xml for DFP for a complete example.
You can check out the 
QuickStart guide including how you can get started with OAuth2 and Maven with the new Java library and 
MigrationGuide on how you can migrate from the old library.
If you find any bugs or feature requests, feel free to file an issue on our 
issue tracker.
As always, please feel free to ask any questions on the 
AdWords API forum or 
DFP API forum or our 
Google+ page.
 - Takeshi Hagikura, AdWords API Team
 - Takeshi Hagikura, AdWords API Team