Merge branch 'java-11plus' into 'master'

Update Forge scripts for Java 11+ and Java 17+

See merge request core-developers/forge!5566

forge-gui-desktop/src/main/config/forge.sh

@@ -1,3 +1,52 @@
-#!/bin/sh
+#!/bin/bash
+ 
+# returns the JDK version.
+# 8 for 1.8.0_nn, 9 for 9-ea etc, and "no_java" for undetected
+# Based on the code from this source: https://eed3si9n.com/detecting-java-version-bash
+jdk_version() {
+  local result
+  local java_cmd
+  if [[ -n $(type -p java) ]]
+  then
+    java_cmd=java
+  elif [[ (-n "$JAVA_HOME") && (-x "$JAVA_HOME/bin/java") ]]
+  then
+    java_cmd="$JAVA_HOME/bin/java"
+  fi
+  local IFS=$'\n'
+  # remove \r for Cygwin
+  local lines=$("$java_cmd" -Xms32M -Xmx32M -version 2>&1 | tr '\r' '\n')
+  if [[ -z $java_cmd ]]
+  then
+    result=no_java
+  else
+    for line in $lines; do
+      if [[ (-z $result) && ($line = *"version \""*) ]]
+      then
+        local ver=$(echo $line | sed -e 's/.*version "\(.*\)"\(.*\)/\1/; 1q')
+        # on macOS, sed doesn't support '?'
+        if [[ $ver = "1."* ]]
+        then
+          result=$(echo $ver | sed -e 's/1\.\([0-9]*\)\(.*\)/\1/; 1q')
+        else
+          result=$(echo $ver | sed -e 's/\([0-9]*\)\(.*\)/\1/; 1q')
+        fi
+      fi
+    done
+  fi
+  echo "$result"
+}
+v="$(jdk_version)"
+
+SHAREDPARAMS='-Xmx4096m -Dfile.encoding=UTF-8 -jar $project.build.finalName$'
 cd $(dirname "${0}")
-java -Xmx4096m -Dfile.encoding=UTF-8 -jar $project.build.finalName$
+
+if [[ $v -ge 17 ]]
+then
+    java --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.lang.reflect=ALL-UNNAMED --add-opens java.base/java.text=ALL-UNNAMED --add-opens java.desktop/java.awt.font=ALL-UNNAMED $SHAREDPARAMS
+elif [[ $v -ge 11 ]]
+then
+    java --illegal-access=permit $SHAREDPARAMS
+else
+    java $SHAREDPARAMS
+fi