SAN JOSE, Calif. (AP) _ Prosecutors decided not to file charges against a youth who came under investigation after his girlfriend wrote an essay accusing him of sexual and physical abuse.

The decision not to file charges was made Friday, said Janet Cartwright, supervisor of the juvenile division of the Santa Clara County District Attorney's Office.

Cartwright said she couldn't comment on details of the case because the people involved are minors.

Police arrested the 17-year-old boy Monday for investigation of assault and battery.

The youth's lawyer, Dennis Lembert, said he was ''delighted'' by the decision not to seek charges. ''I've said from the very beginning that my client would be vindicated and he has been,'' he said.

''A lot of evidence was presented to the district attorney's office. They didn't find sufficient cause to file charges,'' said Officer Veronica Damon, San Jose Police Department spokeswoman.

In the wake of the case, East Side Union High School District officials have proposed a plan for dealing with date rape. Recommendations presented to trustees Thursday include training for administrators, counselors and teachers and a class for students. Information also will be mailed to parents.

The girl and her mother said they were disappointed by the prosecutors' decision, but supported the district's proposal.

The girl accused her former boyfriend of raping her in August 1990 and then hitting and harassing to keep her from talking about it.