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warning method concatenates an empty string to effect type conversion (Findbugs)

method org.jcoderz.testdata.Importer.getAsPrimaryKey(String) concatenates an empty string to effect type conversion

This method concatenates an empty string with a literal value, in order to convert the literal value into a string. It is more efficient to use String.valueOf() to do the same thing as you do not incur the cost of creating a StringBuffer/Builder and calling methods on it to accomplish this.