X: Statup checks for missing configs

run.sh

@@ -1,11 +1,20 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
+cd -- "$(dirname -- "${BASH_SOURCE[0]}")"
+
+LOG4J_CONFIG="conf/log4j2.xml"
+
+if [[ ! -r "$LOG4J_CONFIG" || ! -s "$LOG4J_CONFIG" ]]; then
+  echo "ERROR: Log4j2 configuration file is missing, unreadable, or empty: $PWD/$LOG4J_CONFIG" >&2
+  exit 1
+fi
+
 shopt -s nullglob
 
 jars=(libs/*.jar)
 if (( ${#jars[@]} == 0 )); then
-  echo "ERROR: No JARs found in libs/" >&2
+  echo "ERROR: No JARs found in $PWD/libs/" >&2
   exit 1
 fi
 
@@ -14,6 +23,6 @@ CLASSPATH=$(IFS=:; echo "${jars[*]}")
 exec java \
   --enable-native-access=javafx.graphics \
   --enable-preview \
-  -Dlog4j.configurationFile=conf/log4j2.xml \
+  "-Dlog4j.configurationFile=$LOG4J_CONFIG" \
   -cp "$CLASSPATH" \
   com.r35157.nenjim.hubd.impl.ref.Main