add /usr/local/bin/sbt with folloving content, make sure it's executable (chmod a+x):

#!/bin/bash
if type -p java; then
echo "found java executable in PATH"
_java=java
elif [[ -n "$JAVA_HOME" ]] && [[ -x "$JAVA_HOME/bin/java" ]]; then
echo "found java executable in JAVA_HOME"
_java="$JAVA_HOME/bin/java"
else
echo "no java"
fi ( Read more... )