JAVA_HOME detection fails

[HonoluluHenk]

jvmtop.sh does not allow symlinking,
JAVA_HOME detection does not work, even for Oracle JDK if the path does contain "bin" multiple times.

[HonoluluHenk]

Updated jvmtoph.sh

#!/bin/sh
# jvmtop - java monitoring for the command-line 
# launch script
#
# author: Markus Kolb
# 

# set -x

# determine installation directory
realpath=$(readlink -f "$0")
DIR=$(dirname "${realpath}")

# Make sure, JAVA_HOME and the java executable are available
if [ ! -z "$JAVA_HOME" ] ; then
        java="${JAVA_HOME}/java"
else
        # try the default installed JDK (i.e.: find javac)
        javac=$(readlink -f $(which javac 2>/dev/null) 2>/dev/null)
        bin_dir=$(dirname "${javac}")
        JAVA_HOME=$(dirname "${bin_dir}")
        java="${JAVA_HOME}/bin/java"
fi

TOOLSJAR="${JAVA_HOME}/lib/tools.jar"
if [ ! -f "$TOOLSJAR" ] ; then
        # some dists like CentOS use this directory layout
        TOOLSJAR="${JAVA_HOME}/../lib/tools.jar"
        if [ ! -f "$TOOLSJAR" ] ; then
                echo "No JDK installed or JAVA_HOME='$JAVA_HOME' seems to be no JDK!" >&2
                exit 1
        fi
fi

"${java}" $JAVA_OPTS -cp "$DIR/jvmtop.jar:$TOOLSJAR" \
com.jvmtop.JvmTop "$@"
exit $?

This should also fix #79

(The updated comment just contains fixed github syntax hilighting)
(Added quoting as suggestet by muxator)

[muxator]

Hi @HonoluluHenk, for what concerns

jvmtop.sh does not allow symlinking

Do you think that it can be fixed via pull request #95?

My only concern is about the project: there is not much activity lately.

[HonoluluHenk]

Hi @muxator
Unfortunately, #95 does not solve the problem. The other PR is not related to this problem at all :(

[muxator]

Oh, I see.
In fact the symlink support is literally present in your version, so no need for #95.

Should we make a pull request for your version?
Maybe java=${JAVA_HOME}/java could be quoted (java="${JAVA_HOME}"/java).

[HonoluluHenk]

Should we make a pull request for your version?

Yes, be my guest :)
(I added your quoting enhancement in the original post)