Exception in thread "main" java.lang.NoClassDefFoundError: com/google/common/base/Preconditions

Adding guava-11.0.2.jar to the build path solved the issue. This jar is in /share/hadoop/tools/lib folder. I have installed hadoop 2.4.0.

Make sure you have added the correct Jar to your build path..

My issue has been resolved by adding the following jar

<dependency>
    <groupId>com.google.guava</groupId>
    <artifactId>guava</artifactId>
    <version>13.0-rc1</version>
</dependency>