SpringTransactionTemplateExample.scala

import _root_.org.springframework.transaction.support.{TransactionCallback, TransactionTemplate}
import _root_.org.springframework.transaction.TransactionStatus

object TransactionUtils {
    def inTransaction[T](tt:TransactionTemplate)(block: =>T):T =
        tt.execute(new TransactionCallback[T]() {
            override def doInTransaction(status:TransactionStatus) = block
        })
}

trait TransactionSupport {
    def transactionTemplate:TransactionTemplate

    protected def inTransaction[T](block: =>T):T = TransactionUtils.inTransaction(transactionTemplate)(block)
}

...

class Demo(private val transactionTemplate:TransactionTemplate) extends TransactionSupport {
    ...
    def demo() {
        inTransaction {
            val obj = repo.findObjectById(id)
            repo.delete(obj)
        }
    }
}

inTransaction(tt) {
    val obj = repo.findObjectById(id)
    repo.delete(obj)
}