It is suggested that you do not use wildcards in the import statements. This defeats the entire purpose of properly packing the code into different classes and packages. Rather, import only what you need.
Exceptions usually follow the AbcDefException nomenclature. Some examples are - NullPointerException, RuntimeException, etc. This allows the person reading/viewing the code understand that the entity being dealt with is an Exception rather than having to rely on the context.
This method takes too many parameters - a potential code smell/styling issue which affects the overall readability of the code. Consider using default parameter values/currying.
Empty blocks do not add anything of value to the codebase. We believe that this is either a copy-paste error or that the programmer forgot to add the relevant statements.
Any Scala method with a single statement in the body maybe refactored to follow the single-line convention. If the statement is more than 30 chars but less than 70, it is suggested that you move it to the next line and indent it with 2 spaces.