This experimental script uses Gradle to build a classpath from a project's dependencies then run a given java class

gradlerun.bash

#!/bin/bash
# Example: gradlerun path/to/ivyrepo com.example:mylib:+ com.example.MyMainClass arg1

REPO=$1
DEP=$2
MAIN=$3
ARG=$4
shift 4

SCRIPT=/tmp/gradlescript$$

cat > $SCRIPT << EOF

apply plugin: 'java'

repositories {
  mavenCentral()
  ivy {
    url "$REPO"
  }
}

dependencies {
  runtime "$DEP"
}

task(main, type: JavaExec) {
  classpath = sourceSets.main.runtimeClasspath
  main = "$MAIN"
  args "$ARG"
}
EOF

trap "rm -f $SCRIPT" 0

gradle -b $SCRIPT -q main "$@"