Auto-merging via docker-versions-create

Dockerfile

@@ -1,4 +1,4 @@
-FROM adoptopenjdk/openjdk8-openj9:alpine-nightly
+FROM adoptopenjdk/openjdk13:alpine-jre
 
 LABEL maintainer "itzg"
 

README.md

@@ -1046,14 +1046,6 @@ via a `JVM_XX_OPTS` environment variable.
 For some cases, if e.g. after removing mods, it could be necessary to startup minecraft with an additional `-D` parameter like `-Dfml.queryResult=confirm`. To address this you can use the environment variable `JVM_DD_OPTS`, which builds the params from a given list of values separated by space, but without the `-D` prefix. To make things running under systems (e.g. Plesk), which doesn't allow `=` inside values, a `:` (colon) could be used instead. The upper example would look like this:
 `JVM_DD_OPTS=fml.queryResult:confirm`, and will be converted to `-Dfml.queryResult=confirm`.
 
-The container uses [OpenJ9](https://www.eclipse.org/openj9/docs) and a couple of J9 options are
-simplified by environment variables:
-
-- `-e TUNE_VIRTUALIZED=TRUE` : enables the option to 
-  [optimize for virtualized environments](https://www.eclipse.org/openj9/docs/xtunevirtualized/)
-- `-e TUNE_NURSERY_SIZES=TRUE` : configures nursery sizes where the initial size is 50%
-  of the `MAX_MEMORY` and the max size is 80%.
-
 ### Enable Remote JMX for Profiling
 
 To enable remote JMX, such as for profiling with VisualVM or JMC, add the environment variable `ENABLE_JMX=true` and add a port forwarding of TCP port 7091, such as:

start-minecraftFinalSetup

@@ -88,23 +88,6 @@ if [ -n "$JVM_DD_OPTS" ]; then
       done
 fi
 
-if isTrue ${TUNE_VIRTUALIZED}; then
-  JVM_XX_OPTS="${JVM_XX_OPTS} -Xtune:virtualized"
-fi
-
-if isTrue ${TUNE_NURSERY_SIZES}; then
-  case ${MAX_MEMORY^^} in
-    *G)
-      MAX_MEMORY_MB=$(( ${MAX_MEMORY%?} * 1024 )) ;;
-    *M)
-      MAX_MEMORY_MB=${MAX_MEMORY%?} ;;
-  esac
-
-  NURSERY_MINIMUM=$(( ${MAX_MEMORY_MB} / 2 ))
-  NURSERY_MAXIMUM=$(( ${MAX_MEMORY_MB} * 4/5 ))
-  JVM_XX_OPTS="${JVM_XX_OPTS} -Xmns${NURSERY_MINIMUM}M -Xmnx${NURSERY_MAXIMUM}M"
-fi
-
 if isTrue ${ENABLE_JMX}; then
   : ${JMX_HOST:=0.0.0.0}
   : ${JMX_PORT:=7091}