multimedia/JSampler: Fail if no jdk package installed.

Signed-off-by: B. Watson <yalhcru@gmail.com>

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

multimedia/JSampler/JSampler.SlackBuild

@@ -27,9 +27,6 @@ if [ -z "$ARCH" ]; then
   esac
 fi
 
-# If the variable PRINT_PACKAGE_NAME is set, then this script will report what
-# the name of the created package would be, and then exit. This information
-# could be useful to other scripts.
 if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
   echo "$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.$PKGTYPE"
   exit 0
@@ -66,9 +63,21 @@ cd $PRGNAM-$VERSION
 chown -R root:root .
 find -L . \
  \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 -o -perm 511 \) \
- -exec chmod 755 {} \; -o \
+ -exec chmod 755 {} \+ -o \
  \( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
- -exec chmod 644 {} \;
+ -exec chmod 644 {} \+
+
+if [ -z "$JAVA_HOME" ]; then
+  source /etc/profile.d/zulu-openjdk8.sh
+fi
+
+if [ -z "$JAVA_HOME" ]; then
+  cat <<EOF
+*** No JDK found. Install zulu-openjdk8 or another *jdk package and
+*** try again.
+EOF
+  exit 1
+fi
 
 # make sure destdir exists
 mkdir -p $PKG/$JAVA_HOME/jre/bin/