Folder contains below .jar files

jettison-1.1.jar
commons-lang3-3.3.2.jar

You can find above .jar files in this repository at location:
WindowsAzureToolkitForEclipseWithJava\PluginsAndFeatures\AddLibrary\AzureLibraries\com.microsoftopentechnologies.windowsazure.tools.sdk\dependencies

or alternatively you can download them from maven repository.