presto-main/src/main/java/io/prestosql/server/ThreadResource.java/StackLine/StackLine
class StackLine:        @JsonCreator
        public StackLine(
                @JsonProperty("file") String file,
                @JsonProperty("line") int line,
                @JsonProperty("className") String className,
                @JsonProperty("method") String method)
        {
            this.file = file;
            this.line = line;
            this.className = className;
            this.method = method;
        }