--- conf/cassandra-env.sh.orig
+++ conf/cassandra-env.sh
@@ -90,7 +90,7 @@
 
 java_ver_output=`"${JAVA:-java}" -version 2>&1`
 
-jvmver=`echo "$java_ver_output" | grep 'java version' | awk -F'"' 'NR==1 {print $2}'`
+jvmver=`echo "$java_ver_output" | egrep 'java version|openjdk version' | awk -F'"' 'NR==1 {print $2}'`
 JVM_VERSION=${jvmver%_*}
 JVM_PATCH_VERSION=${jvmver#*_}