Configuring Java to the WildFly

3 min

Some java parameters need to be set for the application server to work. Enter in the directory /bin home of wildfly /opt/wildfly/bin. Edit the file standalone.conf and include the new setting after the following line:

#
# Specify the exact Java VM executable to use.
#
#JAVA=""

if [ "x$JBOSS_MODULES_SYSTEM_PKGS" = "x" ]; then
   JBOSS_MODULES_SYSTEM_PKGS="org.jboss.byteman"
fi

Add the following extract after the line above:

if [ "x$JAVA_OPTS" = "x" ]; then
	JAVA_OPTS="$JAVA_OPTS -Xmx12g"
	JAVA_OPTS="$JAVA_OPTS -Xms12g"
	JAVA_OPTS="$JAVA_OPTS -XX:MinHeapFreeRatio=40"
	JAVA_OPTS="$JAVA_OPTS -XX:MaxHeapFreeRatio=80"
	JAVA_OPTS="$JAVA_OPTS -XX:NewRatio=8"
	JAVA_OPTS="$JAVA_OPTS -XX:SurvivorRatio=32"
	JAVA_OPTS="$JAVA_OPTS -XX:+UseG1GC"
	JAVA_OPTS="$JAVA_OPTS -XX:G1HeapRegionSize=4"
	JAVA_OPTS="$JAVA_OPTS -XX:InitiatingHeapOccupancyPercent=50"
	JAVA_OPTS="$JAVA_OPTS -Djava.net.preferIPv4Stack=true"
	JAVA_OPTS="$JAVA_OPTS -Dorg.jboss.resolver.warning=true"
	JAVA_OPTS="$JAVA_OPTS -Duser.timezone="America/Sao_Paulo""
	JAVA_OPTS="$JAVA_OPTS -Djboss.modules.system.pkgs=$JBOSS_MODULES_SYSTEM_PKGS"
	JAVA_OPTS="$JAVA_OPTS -Djava.awt.headless=true"
	JAVA_OPTS="$JAVA_OPTS -Djboss.server.default.config=standalone-full-ha.xml"
	JAVA_OPTS="$JAVA_OPTS -Djboss.bind.address=0.0.0.0"
	JAVA_OPTS="$JAVA_OPTS -Djboss.bind.address.management=0.0.0.0"
else
	echo "JAVA_OPTS already set in environment; overriding default settings with values: $JAVA_OPTS"
fi

The two most important sections of the line above are:

JAVA_OPTS="$JAVA_OPTS -Xms12g"
JAVA_OPTS="$JAVA_OPTS -Xmx12g"

These indicate the memory usage limit of the java virtual machine and should vary based on the amount of memory of the server you are installing. You can consider 2GB for the operating system and the rest for Java if you are running the dismembered database application server. If the base is running on the same server (which we don't recommend for production) you need to consider the needs for memory usage of the base, operating system, and finally configure java usage. The (xmx) and (xms) values may be the same to improve CITSmart performance.

And finally, uncomment the line below:

#JAVA_HOME="/opt/java/jdk"

And set it up the right way:

#JAVA_HOME="/opt/jdk"