Java 11 build

Signed-off-by: Sergii Kabashniuk <skabashniuk@redhat.com>

assembly/assembly-che-tomcat8/src/assembly/bin/setenv.sh

@@ -14,7 +14,17 @@
 [ -z "${CHE_LOCAL_CONF_DIR}" ]  && CHE_LOCAL_CONF_DIR="${CATALINA_HOME}/conf/"
 
 #Global JAVA options
-[ -z "${JAVA_OPTS}" ]  && JAVA_OPTS="-Xms256m -Xmx2048m -Djava.security.egd=file:/dev/./urandom"
+[ -z "${JAVA_OPTS}" ]  && JAVA_OPTS="-XX:MinRAMPercentage=60.0 -XX:MaxRAMPercentage=90.0 -Djava.security.egd=file:/dev/./urandom"
+# Check compatible JAVA_OPTS
+JAVA_VERSION=$(java -version 2>&1 | head -n 1 | cut -d'"' -f2 | cut -d'.' -f1 | sed 's/[^0-9]*//g')
+if ([ "$JAVA_VERSION" -ge 11 ])
+then
+   echo "Incompatible JAVA_OPTS configured to use with Java 11. Reset to default"
+   echo $JAVA_OPTS
+   JAVA_OPTS="-XX:MinRAMPercentage=60.0 -XX:MaxRAMPercentage=90.0 -Djava.security.egd=file:/dev/./urandom"
+else
+   echo "Sorry. Not found."
+fi
 
 #Global LOGS DIR
 [ -z "${CHE_LOGS_DIR}" ]  && CHE_LOGS_DIR="$CATALINA_HOME/logs"

dockerfiles/che/Dockerfile

@@ -5,7 +5,7 @@
 #
 # SPDX-License-Identifier: EPL-2.0
 #
-FROM openjdk:8u242-jre-slim
+FROM openjdk:11-jre-slim
 ENV LANG=C.UTF-8
 RUN echo "%root ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers && rm -rf /tmp/*
 EXPOSE 8000 8080