Reproduce JDK 11 warning

Ref https://github.com/sbt/sbt/issues/5031

citest/build.sbt

@@ -1,4 +1,5 @@
 lazy val check = taskKey[Unit]("")
+lazy val check2 = taskKey[Unit]("")
 
 lazy val root = (project in file("."))
   .settings(
@@ -8,7 +9,6 @@ lazy val root = (project in file("."))
       val xs = IO.readLines(file("output.txt")).toVector
 
       println(xs)
-
       assert(xs(0) startsWith "[info] Loading project definition")
       assert(xs(1) startsWith "[info] Loading settings")
       assert(xs(2) startsWith "[info] Set current project to Hello")
@@ -18,5 +18,12 @@ lazy val root = (project in file("."))
       val ys = IO.readLines(file("err.txt")).toVector.distinct
 
       assert(ys.isEmpty, s"there's an stderr: $ys")
+    },
+
+    check2 := {
+      val xs = IO.readLines(file("output.txt")).toVector
+      println(xs)
+      val ys = IO.readLines(file("err.txt")).toVector.distinct
+      assert(!ys.exists(_.contains("Ignoring option MaxPermSize; support was removed in 8.0")), s"there's an stderr: $ys")
     }
   )

citest/test.sh

@@ -1,7 +1,11 @@
 #!/bin/bash
 
+# exit when something fails
+set -e
+
 ## https://github.com/travis-ci/travis-ci/issues/8408
 unset _JAVA_OPTIONS
+unset SBT_OPTS
 
 java -version
 ## end of Java switching
@@ -9,12 +13,12 @@ java -version
 mkdir -p freshly-baked
 unzip -qo ../target/universal/sbt.zip -d ./freshly-baked
 
-export SBT_OPTS=-Dfile.encoding=UTF-8
+./freshly-baked/sbt/bin/sbt -Dsbt.no.format=true about
+./freshly-baked/sbt/bin/sbt -Dsbt.no.format=true about 1> output.txt 2> err.txt
+./freshly-baked/sbt/bin/sbt check2
 
 ./freshly-baked/sbt/bin/sbt about run -v
 
-export SBT_OPTS="-Dfile.encoding=UTF-8 -Xms2048M -Xmx2048M -Xss4M"
-
 ./freshly-baked/sbt/bin/sbt about run
 
 fail() {
@@ -33,4 +37,3 @@ test -d ./target/home3/alternate-preloaded/org/scala-sbt || fail "expected to fi
 
 env HOME=./target/home4 ./freshly-baked/sbt/bin/sbt -J-Dsbt.global.base=./target/home4/global-base about
 test -d ./target/home4/global-base/preloaded/org/scala-sbt || fail "expected to find preloaded in ./target/home4/global-base"
-

src/universal/bin/sbt

@@ -13,6 +13,8 @@ declare init_sbt_version=_to_be_replaced
 declare sbt_default_mem=1024
 declare -r default_sbt_opts=""
 declare -r default_java_opts="-Dfile.encoding=UTF-8"
+declare sbt_verbose=0
+declare sbt_debug=0
 
 ###  ------------------------------- ###
 ###  Helper methods for BASH scripts ###
@@ -78,10 +80,10 @@ echoerr () {
   echo 1>&2 "$@"
 }
 vlog () {
-  [[ $verbose || $debug ]] && echoerr "$@"
+  [[ $sbt_verbose || $sbt_debug ]] && echoerr "$@"
 }
 dlog () {
-  [[ $debug ]] && echoerr "$@"
+  [[ $sbt_debug ]] && echoerr "$@"
 }
 
 jar_file () {
@@ -103,7 +105,7 @@ rt_export_file () {
 
 execRunner () {
   # print the arguments one to a line, quoting any containing spaces
-  [[ $verbose || $debug ]] && echo "# Executing command line:" && {
+  [[ $sbt_verbose || $sbt_debug ]] && echo "# Executing command line:" && {
     for arg; do
       if printf "%s\n" "$arg" | grep -q ' '; then
         printf "\"%s\"\n" "$arg"
@@ -518,9 +520,9 @@ process_args () {
   while [[ $# -gt 0 ]]; do
     case "$1" in
        -h|-help) usage; exit 1 ;;
-    -v|-verbose) verbose=1 && shift ;;
+    -v|-verbose) sbt_verbose=1 && shift ;;
     -V|-version) print_sbt_version=1 && shift ;;
-      -d|-debug) debug=1 && addSbt "-debug" && shift ;;
+      -d|-debug) sbt_debug=1 && addSbt "-debug" && shift ;;
 
            -ivy) require_arg path "$1" "$2" && addJava "-Dsbt.ivy.home=$2" && shift 2 ;;
            -mem) require_arg integer "$1" "$2" && addMemory "$2" && shift 2 ;;