有时在Scala中调用Java的库，Java库会返回某些Java的集合或类型，必须经过一些转换才能正常使用。
否则有可能在编译的过程遇到这个错误。
错误字符串
下面是错误的主要信息。
Scala Java Error: value filter is not a member of *
解决办法
在代码中引入下面名字空间，引用Java和Scala的各种集合和类型之间的隐式转换。
import collection.JavaConversions._
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