String null to empty

You can use Objects.toString() (standard in Java 7):

 
Objects.toString(gearBox, "")

Objects.toString(id, "")

 or 

 StringUtils.defaultString(String str)
Returns either the passed in String, or if the String is null, an empty String ("").
 StringUtils.defaultString(null)  = ""
 StringUtils.defaultString("")    = ""
 StringUtils.defaultString("bat") = "bat"
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