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Administering the Virtual Machine for the Java Platform |
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This chapter provides procedures for administering the Virtual Machine
for the Java platform (Java Virtual Machine) or JVM machine) in the
GlassFish Server Open Source Edition 5.0 environment by using the
asadmin command-line utility.
The following topics are addressed here:
Instructions for accomplishing these tasks by using the Administration Console are contained in the Administration Console online help.
The Java Virtual Machine is an interpretive computing engine responsible for running the byte codes in a compiled Java program. The virtual machine translates the Java byte codes into the native instructions of the host machine. GlassFish Server, being a Java process, requires a virtual machine to run and support the Java applications running on it. JVM settings are part of an GlassFish Server configuration.
The following topics are addressed here:
Use the create-jvm-options subcommand in remote mode to create JVM
options in the Java configuration or the profiler elements of the
domain.xml file. If JVM options are created for a profiler, these
options are used to record the settings that initiate the profiler.
Ensure that the server is running.
Remote subcommands require a running server.
Create JVM options by using the
create-jvm-options subcommand.
To create more than one JVM option, use a colon (:) to separate the
options. If the JVM option itself contains a colon (:), use the
backslash (\) to offset the colon delimiter.
Information about properties for the subcommand is included in this help
page.
To apply your changes, restart GlassFish Server. See To Restart a Domain.
Example 4-1 Creating JVM Options
This example sets multiple Java system properties.
asadmin> create-jvm-options -Dunixlocation=/root/example:
-Dvariable=\$HOME:
-Dwindowslocation=d\\:\\\sun\\\appserver:
-Doption1=-value1
created 4 option(s)
Command create-jvm-options executed successfully.See Also
You can also view the full syntax and options of the subcommand by
typing asadmin help create-jvm-options at the command line.
Use the list-jvm-options subcommand in remote mode to list the
existing JVM options.
Ensure that the server is running.
Remote subcommands require a running server.
List JVM options by using the list-jvm-options
subcommand.
Example 4-2 Listing JVM Options
This example lists all JVM options.
asadmin> list-jvm-options
-Djava.security.auth.login.config=${com.sun.aas.instanceRoot}/config/login.conf
-XX: LogVMOutput
-XX: UnlockDiagnosticVMOptions
-Dcom.sun.enterprise.config.config_environment_factory_class=com.sun.enterprise.
config.serverbeans.AppserverConfigEnvironmentFactory
-Djavax.net.ssl.keyStore=${com.sun.aas.instanceRoot}/config/keystore.jks
-XX:NewRatio=2
-Djava.security.policy=${com.sun.aas.instanceRoot}/config/server.policy
-Djdbc.drivers=org.apache.derby.jdbc.ClientDriver
-Djavax.net.ssl.trustStore=${com.sun.aas.instanceRoot}/config/cacerts.jks
-client
-Djava.ext.dirs=${com.sun.aas.javaRoot}/lib/ext${path.separator}${com.sun.aas.ja
vaRoot}/jre/lib/ext${path.separator}${com.sun.aas.instanceRoot}/lib/ext${path.se
parator}${com.sun.aas.derbyRoot}/lib
-Xmx512m
-XX:LogFile=${com.sun.aas.instanceRoot}/logs/jvm.log
-Djava.endorsed.dirs=${com.sun.aas.installRoot}/lib/endorsed
Command list-jvm-options executed successfully.See Also
You can also view the full syntax and options of the subcommand by
typing asadmin help list-jvm-options at the command line.
Use the delete-jvm-options subcommand in remote mode to delete JVM
options from the Java configuration or profiler elements of the
domain.xml file.
Ensure that the server is running.
Remote subcommands require a running server.
List JVM options by using the list-jvm-options
subcommand.
If necessary, notify users that the JVM option is being deleted.
Delete JVM options by using the
delete-jvm-options subcommand.
To remove more than one JVM option, use a colon (:) to separate the
options. If the JVM option itself contains a colon, use the backslash
(\) to offset the colon delimiter.
To apply your changes, restart GlassFish Server. See To Restart a Domain.
Example 4-3 Deleting a JVM Option
This example removes a single JVM option.
asadmin> delete-jvm-options -Dopt1=A
deleted 1 option(s)
Command delete-jvm-options executed successfully.Example 4-4 Deleting Multiple JVM Options
This example removes multiple JVM options.
asadmin> delete-jvm-options -Doption1=-value1:-Dvariable=\$HOME
deleted 2 option(s)
Command delete-jvm-options executed successfully.See Also
You can also view the full syntax and options of the subcommand by
typing asadmin help delete-jvm-options at the command line.
Use the generate-jvm-report subcommand in remote mode to generate a
JVM report showing the threads (dump of a stack trace), classes, memory,
and loggers for a specified instance, including the domain
administration server (DAS). You can generate the following types of
reports: summary (default), class, thread, log.
Ensure that the server is running.
Remote subcommands require a running server.
Generate the report by using the
generate-jvm-report subcommand.
Example 4-5 Generating a JVM Report
This example displays summary information about the threads, classes, and memory.
asadmin> generate-jvm-report --type summary
Operating System Information:
Name of the Operating System: Windows XP
Binary Architecture name of the Operating System: x86, Version: 5.1
Number of processors available on the Operating System: 2
System load on the available processors for the last minute: NOT_AVAILABLE.
(Sum of running and queued runnable entities per minute).
.
,
.
user.home = C:\Documents and Settings\Jennifer
user.language = en
user.name = Jennifer
user.timezone = America/New_York
user.variant =
variable = \$HOME
web.home = C:\Preview\v3_Preview_release\distributions\web\target\
glassfish\modules\web
Command generate-jvm-report executed successfully.See Also
You can also view the full syntax and options of the subcommand by
typing asadmin help generate-jvm-report at the command line.
A profiler generates information used to analyze server performance.
The following topics are addressed here:
A server instance is tied to a particular profiler by the profiler
element in the Java configuration. If JVM options are created for a
profiler, the options are used to record the settings needed to activate
a particular profiler. Use the create-profiler subcommand in remote
mode to create the profiler element in the Java configuration.
Only one profiler can exist. If a profiler already exists, you receive an error message that directs you to delete the existing profiler before creating a new one.
Ensure that the server is running.
Remote subcommands require a running server.
Create a profiler by using the create-profiler
subcommand.
Information about properties for the subcommand is included in this help
page.
To apply your changes, restart GlassFish Server.
See To Restart a Domain.
Example 4-6 Creating a Profiler
This example creates a profiler named sample_profiler.
asadmin> create-profiler --classpath=/home/appserver/ --nativelibrarypath=/u/home/lib
--enabled=false --property=defaultuser=admin:password=adminadmin sample_profiler
Command create-profiler executed successfully.See Also
You can also view the full syntax and options of the subcommand by
typing asadmin help create-profiler at the command line.
Use the delete-profiler subcommand in remote mode to delete the
profiler element from the Java configuration. You can then create a new
profiler.
Ensure that the server is running.
Remote subcommands require a running server.
Delete the profiler by using the delete-profiler
subcommand.
To apply your changes, restart GlassFish Server.
See To Restart a Domain.
Example 4-7 Deleting a Profiler
This example deletes the profiler named sample_profiler.
asadmin> delete-profiler sample_profiler
Command delete-profiler executed successfully.See Also
You can also view the full syntax and options of the subcommand by
typing asadmin help delete-profiler at the command line.
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