Java 无法初始化类com.google.gdata.client.youtube.youtube服务

我正在使用grails和googleyoutubeapi（）获取用户上传的视频的详细信息。但一旦我尝试将YouTube服务类初始化为：

String emailID="XXXX@gmail.com"//this is the id with which i registered for developer key
String DeveloperKey="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" //developer key given by google
YouTubeService service=new YouTubeService(emailID,DeveloperKey)
//I am done using appName,clientId(given by google) as the first parameter to the 
YouTubeService but nothing helped

它给了我以下错误：

Class java.lang.ClassNotFoundException
Message com.google.gdata.data.media.MediaMultipart
//I can see this MediaMultipart file in the said destination in one of the included jars.
Originally it was complaining about com.google.collections.common.Maps but then i
added google.collections.1-rc.jar. I also tried adding guava.jar as read from various
forums but that could not solve my problem 

如果重新加载页面，错误将更改为

Class java.lang.NoClassDefFoundError
Message Could not initialize class com.google.gdata.client.youtube.YouTubeService

---

我已经包括了所有必需的jar（），但是这个问题没有得到解决。请帮助。

尝试添加

javax.mail

和

com.google.guava

gdata java客户端所需的依赖项