How to update the Generic JVM Arguments using wsadmin

Purpose – To update the Generic JVM Arguments using wsadmin

Generic JVM arguments are the command line arguments that are passed to the JVM code that starts up the Application server process. They are used
configure and adjust how the JVM executes. Any changes to the JVM arguments requires a JVM restart for them to take affect.

Solution –

Here is a sample Jython script which could be used to modify the Generic JVM arguments as per your need.

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import os
import sys
import java
import java.util as util
import java.io as javaio

def usage():
print “./wsadmin.sh -lang jython -f addJVMArg_new.py <JVM_name> add <New_argument>”
print “./wsadmin.sh -lang jython -f addJVMArg_new.py <JVM_name> update”


def getJVMConfigID(jvm_name):
server_list=AdminConfig.list(‘Server’).splitlines()
for server in server_list:
server_name=AdminConfig.showAttribute(server,’name’)
if (server_name==jvm_name):
jvm_id=AdminConfig.list(‘JavaVirtualMachine’,server)
return jvm_id

def currentJvmArguments(jvm_id):
#print “Current JVM arguments”
current_arguments=AdminConfig.showAttribute(jvm_id,”genericJvmArguments”)
#print str(current_arguments)
return str(current_arguments)

def updateJvmArguments(jvm_id):
current_arguments=currentJvmArguments(jvm_id)
print str(current_arguments)
print “Input new arguments”
new_arguments=raw_input(“Provide the new arguments :”)
print new_arguments
print AdminConfig.modify(jvm_id,[[‘genericJvmArguments’,new_arguments]])
#print AdminConfig.save()

def addJvmArguments(jvm_id,action,new_argument):
current_arguments=currentJvmArguments(jvm_id)
print str(current_arguments)
print “Need to add the arguments”
current_arguments=str(current_arguments) + ‘ ‘ + new_argument
print “modified arguments is as below :”
print current_arguments
print AdminConfig.modify(jvm_id,[[‘genericJvmArguments’,current_arguments]])
#print AdminConfig.save()


if not (len(sys.argv) >= 2):
print “Usage : “,
usage()
sys.exit(1)



#######################################################################
######################## Main script ##################################
#######################################################################

jvm_name=sys.argv[0]
action=sys.argv[1]

print “JVM Name is : “, jvm_name
print “Action is : “, action
#print “new_argument is : “, new_argument

# Retrieve the JVM Config id

jvm_id=getJVMConfigID(jvm_name)
jvm_arguments=currentJvmArguments(jvm_id)

print “JVM ID is”, jvm_id
print “JVM Arguments are :”, jvm_arguments

if (action == “add”):
new_argument=sys.argv[2]
print “new_argument is : “, new_argument
addJvmArguments(jvm_id,action,new_argument)
else:
updateJvmArguments(jvm_id)

### END of Main Script

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Sample output –

./wsadmin.bat -lang jython -username <admin_user> -password <admin_pwd> -f addJVMArg_new.py ClusMemb_1 add “-Xnoclassgc”
WASX7209I: Connected to process “dmgr” on node XXX using SOAP connector;  The type of process is: DeploymentManager
WASX7303I: The following options are passed to the scripting environment and are available as arguments that are
stored in the argv variable: “[ClusMemb_1, add, -Xnoclassgc]”

JVM Name is :  ClusMemb_1
Action is :  add

JVM ID is (cells/ATLADCADMIN042CellManager01/nodes/ATLADCADMIN042Node02/servers/ClusMemb_1|server.xml#JavaVirtualMachine_1432538823123)
JVM Arguments are : -Duser.region=US -Dlogging.level=DEBUG -Dlogging.level.thirdparty=DEBUG

new_argument is :  -Xnoclassgc
-Duser.region=US -Dlogging.level=DEBUG -Dlogging.level.thirdparty=DEBUG

Need to add the arguments

modified arguments is as below :
-Duser.region=US -Dlogging.level=DEBUG -Dlogging.level.thirdparty=DEBUG -Xnoclassgc

./wsadmin.bat -lang jython -username <admin_user> -password <admin_pwd> -f addJVMArg_new.py ClusMemb_1 update
WASX7209I: Connected to process “dmgr” on node XXX using SOAP connector;  The type of process is: DeploymentManager
WASX7303I: The following options are passed to the scripting environment and are available as arguments that are
stored in the argv variable: “[ClusMemb_1, update]”

JVM Name is :  ClusMemb_1
Action is :  update

JVM ID is (cells/ATLADCADMIN042CellManager01/nodes/ATLADCADMIN042Node02/servers/ClusMemb_1|server.xml#JavaVirtualMachine_1432538823123)
JVM Arguments are : -Duser.region=US -Dlogging.level=DEBUG -Dlogging.level.third party=DEBUG -Dxxx=yyy -Xnoclassgc

-Duser.region=US -Dlogging.level=DEBUG -Dlogging.level.thirdparty=DEBUG -Dxxx=yyy -Xnoclassgc

Input new arguments
Provide the new arguments :-Duser.region=US -Dlogging.level=ERROR -Dlogging.level.thirdparty=DEBUG -Xnoclassgc

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Hope you enjoyed reading this article. Thank you.