Network Deployment (Distributed operating systems), v8.0 > Scripting the application serving environment (wsadmin) > Use properties files to manage system configuration > Manage specific configuration objects using properties files

Work with JVM properties files

We can use properties files to modify or delete JVM (JVM) properties.

Determine the changes to make to your JVM configuration.

Start wsadmin.sh.

To start wsadmin using the Jython language, run...

WP_PROFILE/bin/wsadmin -lang jython

Use a properties file, you can modify or delete JVM properties.

Run administrative commands using wsadmin to change a properties file for a JVM, validate the properties, and apply them to the configuration.

Actions for JVM properties. We can modify or delete JVM properties.

Action	Procedure
create	Not applicable
modify	Edit JVM properties in the properties file and then run applyConfigProperties. The product ignores null or empty list {} property values, and applies only those values that are not null and non-empty.
delete	Edit the JVM properties file so that it contains only those properties to delete and then run deleteConfigProperties. Delete a property sets the property value to a default value, if it exists. If a default value does not exist for the property, the product removes the property.
create Property	Not applicable
delete Property	Not applicable

Optionally, you can use interactive mode with the commands:

AdminTask.command_name('-interactive')

Procedure

• Modify an existing properties file.
  1. Obtain a properties file for the JVM to change.

     We can extract a properties file for a JavaVirtualMachine object using the extractConfigProperties command.

  2. Open the properties file in an editor and change the properties as needed.

     Ensure that the environment variables in the properties file match the system.

     An example JavaVirtualMachine properties file follows:

     #
     # Header
     #
     ResourceType=JavaVirtualMachine
     ImplementingResourceType=Server
     ResourceId=Cell=!{cellName}:Node=!{nodeName}:Server=!{serverName}:JavaProcessDef=:JavaVirtualMachine=
     AttributeInfo=jvmEntries
     #
     
     #
     #Properties
     #
     internalClassAccessMode=ALLOW #ENUM(ALLOW|RESTRICT),default(ALLOW)
     JavaHome="C:\cf50922.30\test/java" #readonly
     debugArgs="-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=7777"
     classpath={}
     initialHeapSize=0 #integer,default(0)
     runHProf=false #boolean,default(false)
     genericJvmArguments=
     hprofArguments=
     osName=null
     bootClasspath={}
     verboseModeJNI=false #boolean,default(false)
     maximumHeapSize=0 #integer,default(0)
     disableJIT=false #boolean,default(false)
     verboseModeGarbageCollection=false #boolean,default(false)
     executableJarFileName=null
     verboseModeClass=false #boolean,default(false)
     debugMode=false #boolean,default(false)
     
     
     #
     # Header JVM System properties #
     ResourceType=JavaVirtualMachine
     ImplementingResourceType=Server
     ResourceId=Cell=!{cellName}:Node=!{nodeName}:Server=!{serverName}:JavaProcessDef=:JavaVirtualMachine=
     AttributeInfo=systemProperties(name,value)
     #
     
     #
     #Properties
     #
     com.ibm.security.krb5.Krb5Debug=off
     com.ibm.security.jgss.debug=off
     #
     EnvironmentVariablesSection
     #
     #
     #Environment Variables
     cellName=myCell04
     nodeName=myNode
     serverName=myServer
     

  3. Run applyConfigProperties to create or change a JVM configuration.

     Run applyConfigProperties applies the properties file to the configuration. The product ignores null or empty list {} property values, and applies only those values that are not null and non-empty. In this Jython example, the optional -reportFileName parameter produces a report named report.txt:

     AdminTask.applyConfigProperties(['-propertiesFileName myObjectType.props -reportFileName report.txt'])
     

• If you no longer need a JVM property, you can delete the property, provided the property does not have a default value.

  To delete one or more properties, specify only the properties to be deleted in the properties file and then run deleteConfigProperties; for example:

  AdminTask.deleteConfigProperties('[-propertiesFileName myObjectType.props -reportFileName report.txt]')
  

  If a property has a default value, the property is not deleted but rather is set to the default value.

Results

We can use the properties file to configure and manage the JVM properties.

What to do next

Save the changes to the configuration.
Extract properties files using wsadmin.sh
Create server, cluster, application, or authorization group objects using properties files and wsadmin scripting
Delete server, cluster, application, or authorization group objects using properties files

Related

PropertiesBasedConfiguration command group using wsadmin.sh

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