Following an investigation, Gospic resident Mraovic was charged with attempting to rape Jarett in his hotel "Ante" last April.
Mraovic's attorneys Zvonimir Hodak and Velimir Dosen said they had expected the court to acquit their client because of lack of evidence.
Jarett's attorney Dragan Jovanic said the verdict damaged the reputation of the court and recalled that the plaintiff had not attended the main hearing.
The deputy county prosecutor in the northern Adriatic city of Rijeka, Darko Kolanovic, said he would appeal the verdict with the Supreme Court.