Index: native/linux/latest/usr/bin/josm-latest
===================================================================
--- native/linux/latest/usr/bin/josm-latest	(revision 18454)
+++ native/linux/latest/usr/bin/josm-latest	(working copy)
@@ -4,30 +4,35 @@
 
 # First, the alternative (if known to work) or users preference as defined by $JAVA_HOME. Next, use OpenJDK.
 # Override to a specific one using $JAVACMD
-ALTERNATIVE_JDK=$(readlink -n -f /etc/alternatives/java)
+ALTERNATIVE_JDK=$(readlink -n -f /etc/alternatives/java || true)
 
-# Let's get the current architecture -- needed for multiarchified Java
-ARCH=$(dpkg --print-architecture 2> /dev/null || true)
-
 JAVA_CMDS="$JAVA_HOME/bin/java"
 
-# If OpenJDK is only available headless, do not try it
-if dpkg --get-selections "openjdk-*-jre" | grep install$ > /dev/null \
-|| dpkg --get-selections "openjdk-*-jre:$ARCH" | grep install$ > /dev/null ; then
-	# LTS versions in decreased order
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-17-openjdk/bin/java /usr/lib/jvm/java-17-openjdk-$ARCH/bin/java"
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-11-openjdk/bin/java /usr/lib/jvm/java-11-openjdk-$ARCH/bin/java"
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-8-openjdk/bin/java /usr/lib/jvm/java-8-openjdk-$ARCH/bin/java"
-	# Released versions in decreased order
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-16-openjdk/bin/java /usr/lib/jvm/java-16-openjdk-$ARCH/bin/java"
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-15-openjdk/bin/java /usr/lib/jvm/java-15-openjdk-$ARCH/bin/java"
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-14-openjdk/bin/java /usr/lib/jvm/java-14-openjdk-$ARCH/bin/java"
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-13-openjdk/bin/java /usr/lib/jvm/java-13-openjdk-$ARCH/bin/java"
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-12-openjdk/bin/java /usr/lib/jvm/java-12-openjdk-$ARCH/bin/java"
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-10-openjdk/bin/java /usr/lib/jvm/java-10-openjdk-$ARCH/bin/java"
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-9-openjdk/bin/java /usr/lib/jvm/java-9-openjdk-$ARCH/bin/java"
-	# Development version(s)
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-18-openjdk/bin/java /usr/lib/jvm/java-18-openjdk-$ARCH/bin/java"
+dpkg_java() {
+  # Let's get the current architecture -- needed for multiarchified Java
+  ARCH=$(dpkg --print-architecture 2> /dev/null || true)
+  # If OpenJDK is only available headless, do not try it
+	if dpkg --get-selections "openjdk-*-jre" | grep install$ > /dev/null \
+	|| dpkg --get-selections "openjdk-*-jre:$ARCH" | grep install$ > /dev/null ; then
+		# LTS versions in decreased order
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-17-openjdk/bin/java /usr/lib/jvm/java-17-openjdk-$ARCH/bin/java"
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-11-openjdk/bin/java /usr/lib/jvm/java-11-openjdk-$ARCH/bin/java"
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-8-openjdk/bin/java /usr/lib/jvm/java-8-openjdk-$ARCH/bin/java"
+		# Released versions in decreased order
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-16-openjdk/bin/java /usr/lib/jvm/java-16-openjdk-$ARCH/bin/java"
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-15-openjdk/bin/java /usr/lib/jvm/java-15-openjdk-$ARCH/bin/java"
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-14-openjdk/bin/java /usr/lib/jvm/java-14-openjdk-$ARCH/bin/java"
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-13-openjdk/bin/java /usr/lib/jvm/java-13-openjdk-$ARCH/bin/java"
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-12-openjdk/bin/java /usr/lib/jvm/java-12-openjdk-$ARCH/bin/java"
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-10-openjdk/bin/java /usr/lib/jvm/java-10-openjdk-$ARCH/bin/java"
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-9-openjdk/bin/java /usr/lib/jvm/java-9-openjdk-$ARCH/bin/java"
+		# Development version(s)
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-18-openjdk/bin/java /usr/lib/jvm/java-18-openjdk-$ARCH/bin/java"
+	fi
+}
+
+if [ -x "$(command -v dpkg)" ]; then
+	dpkg_java
 fi
 # Undetermined version
 JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/default-java/bin/java /usr/bin/java"
@@ -40,7 +45,7 @@
 
 if [ -z "${JAVACMD}" ]; then
     for jcmd in $JAVA_CMDS; do
-        if [ "z$ALTERNATIVE_JDK" = "z$(readlink -n -f "$jcmd")" ] && [ -z "${JAVACMD}" ]; then
+        if [ "z$ALTERNATIVE_JDK" = "z$(readlink -n -f "$jcmd")" ] && [ -z "${JAVACMD}" ] && [ -x "$jcmd" ]; then
             JAVACMD="$jcmd"
             break
         fi
Index: native/linux/tested/usr/bin/josm
===================================================================
--- native/linux/tested/usr/bin/josm	(revision 18454)
+++ native/linux/tested/usr/bin/josm	(working copy)
@@ -4,30 +4,35 @@
 
 # First, the alternative (if known to work) or users preference as defined by $JAVA_HOME. Next, use OpenJDK.
 # Override to a specific one using $JAVACMD
-ALTERNATIVE_JDK=$(readlink -n -f /etc/alternatives/java)
+ALTERNATIVE_JDK=$(readlink -n -f /etc/alternatives/java || true)
 
-# Let's get the current architecture -- needed for multiarchified Java
-ARCH=$(dpkg --print-architecture 2> /dev/null || true)
-
 JAVA_CMDS="$JAVA_HOME/bin/java"
 
-# If OpenJDK is only available headless, do not try it
-if dpkg --get-selections "openjdk-*-jre" | grep install$ > /dev/null \
-|| dpkg --get-selections "openjdk-*-jre:$ARCH" | grep install$ > /dev/null ; then
-	# LTS versions in decreased order
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-17-openjdk/bin/java /usr/lib/jvm/java-17-openjdk-$ARCH/bin/java"
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-11-openjdk/bin/java /usr/lib/jvm/java-11-openjdk-$ARCH/bin/java"
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-8-openjdk/bin/java /usr/lib/jvm/java-8-openjdk-$ARCH/bin/java"
-	# Released versions in decreased order
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-16-openjdk/bin/java /usr/lib/jvm/java-16-openjdk-$ARCH/bin/java"
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-15-openjdk/bin/java /usr/lib/jvm/java-15-openjdk-$ARCH/bin/java"
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-14-openjdk/bin/java /usr/lib/jvm/java-14-openjdk-$ARCH/bin/java"
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-13-openjdk/bin/java /usr/lib/jvm/java-13-openjdk-$ARCH/bin/java"
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-12-openjdk/bin/java /usr/lib/jvm/java-12-openjdk-$ARCH/bin/java"
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-10-openjdk/bin/java /usr/lib/jvm/java-10-openjdk-$ARCH/bin/java"
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-9-openjdk/bin/java /usr/lib/jvm/java-9-openjdk-$ARCH/bin/java"
-	# Development version(s)
-	JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-18-openjdk/bin/java /usr/lib/jvm/java-18-openjdk-$ARCH/bin/java"
+dpkg_java() {
+  # Let's get the current architecture -- needed for multiarchified Java
+  ARCH=$(dpkg --print-architecture 2> /dev/null || true)
+  # If OpenJDK is only available headless, do not try it
+	if dpkg --get-selections "openjdk-*-jre" | grep install$ > /dev/null \
+	|| dpkg --get-selections "openjdk-*-jre:$ARCH" | grep install$ > /dev/null ; then
+		# LTS versions in decreased order
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-17-openjdk/bin/java /usr/lib/jvm/java-17-openjdk-$ARCH/bin/java"
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-11-openjdk/bin/java /usr/lib/jvm/java-11-openjdk-$ARCH/bin/java"
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-8-openjdk/bin/java /usr/lib/jvm/java-8-openjdk-$ARCH/bin/java"
+		# Released versions in decreased order
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-16-openjdk/bin/java /usr/lib/jvm/java-16-openjdk-$ARCH/bin/java"
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-15-openjdk/bin/java /usr/lib/jvm/java-15-openjdk-$ARCH/bin/java"
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-14-openjdk/bin/java /usr/lib/jvm/java-14-openjdk-$ARCH/bin/java"
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-13-openjdk/bin/java /usr/lib/jvm/java-13-openjdk-$ARCH/bin/java"
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-12-openjdk/bin/java /usr/lib/jvm/java-12-openjdk-$ARCH/bin/java"
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-10-openjdk/bin/java /usr/lib/jvm/java-10-openjdk-$ARCH/bin/java"
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-9-openjdk/bin/java /usr/lib/jvm/java-9-openjdk-$ARCH/bin/java"
+		# Development version(s)
+		JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-18-openjdk/bin/java /usr/lib/jvm/java-18-openjdk-$ARCH/bin/java"
+	fi
+}
+
+if [ -x "$(command -v dpkg)" ]; then
+	dpkg_java
 fi
 # Undetermined version
 JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/default-java/bin/java /usr/bin/java"
@@ -40,7 +45,7 @@
 
 if [ -z "${JAVACMD}" ]; then
     for jcmd in $JAVA_CMDS; do
-        if [ "z$ALTERNATIVE_JDK" = "z$(readlink -n -f "$jcmd")" ] && [ -z "${JAVACMD}" ]; then
+        if [ "z$ALTERNATIVE_JDK" = "z$(readlink -n -f "$jcmd")" ] && [ -z "${JAVACMD}" ] && [ -x "$jcmd" ]; then
             JAVACMD="$jcmd"
             break
         fi