warp4j

@@ -37,6 +37,8 @@ function print_help {
     echo '  --windows            create binary for Windows'
     echo '                       if no targets are specified then binaries for'
     echo '                       all targets are created'
+    echo '  --jvm-impl           jvm implementation: hotspot or openj9'
+    echo '                       (default: hotspot)'
     echo '  --jvm-options        <options>'
     echo '                       passed to java like this:'
     echo '                       "java <options> -jar <jar file>";'
@@ -145,6 +147,10 @@ while [[ $# -gt 0 ]]; do
         TARGETS+=($WIN)
         shift
     ;;
+    --jvm-impl)
+        JVM_IMPL="$2"
+        shift 2
+    ;;
     --jvm-options)
         JVM_OPTIONS="$2"
         shift 2
@@ -225,13 +231,22 @@ if [[ $JAVA_VERSION ]] && ! java_version_is_correct $JAVA_VERSION ; then
     fail_with "JDK version \"$JAVA_VERSION\" is not correct"
 fi
 
-JVM_IMPL=hotspot
+JVM_IMPL_HOTSPOT=hotspot
+JVM_IMPL_OPENJ9=openj9
+
+# validate jvm implementation
+if [[ $JVM_IMPL ]] && 
+   [[ $JVM_IMPL != $JVM_IMPL_HOTSPOT ]] &&
+   [[ $JVM_IMPL != $JVM_IMPL_OPENJ9 ]]; then
+    fail_with "jvm implementation \"$JVM_IMPL\" is not correct"
+fi
 
 LATEST_LTS=17 # latest LTS java branch
 
 # default options
 test -z $JAVA_VERSION && JAVA_VERSION=$LATEST_LTS
 test -z $TARGETS && TARGETS=($LIN $MAC $WIN)
+test -z $JVM_IMPL && JVM_IMPL=$JVM_IMPL_HOTSPOT
 
 # returns java branch version
 function get_base_version() {