Work with web server JVM properties files

We can use properties files to modify or delete JVM properties of web servers.

Determine the changes to make to the JVM properties configuration or its configuration objects.

From the server profile bin directory, run wsadmin -lang jython

Using a properties file, we can modify or delete a JVM object.

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

Action	Procedure
create	Not applicable
modify	Edit properties and then run the applyConfigProperties command to modify the value of a custom property.
delete	Specify the properties to delete in the properties file and then run the deleteConfigProperties command to delete a property. If the deleted property has a default value, the property is set to the default value.
create Property	Not applicable
delete Property	Not applicable

Optionally, we can use interactive mode with the commands:

AdminTask.command_name('-interactive')

• Modify existing web server JVM properties.

  1. Obtain a properties file for the JVM to change.

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

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

     Open an editor and specify JVM custom properties in a properties file. We can copy the following example properties into an editor and modify the properties as needed for the situation. To specify a custom property, edit the AttributeInfo value and properties values. Ensure that the environment variables in the properties file match the system.

     #
     # 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=
     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)
      #
     EnvironmentVariablesSection
     #
     #
     #Environment Variables
     cellName=myNode04Cell
     nodeName=myNode04
     serverName=IHS

  3. Run the applyConfigProperties command to change a JVM properties configuration.

     Running the applyConfigProperties command applies the properties file to the configuration. In this Jython example, the optional -reportFileName parameter produces a report named report.txt:

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

• Delete web server JVM properties.

  To delete one or more properties, specify only those properties to delete in the properties file and run deleteConfigProperties.

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

Results

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

What to do next

Save the changes to the configuration.

Related tasks

Extracting properties files

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

PropertiesBasedConfiguration (AdminTask)