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Frequently asked questions

Instroduction | Source | Features | User manual | Scripting | F.A.Q.

Q. Error of .jmxterm_history

The latest Jmxterm code in git head included a major dependency update, especially an upgrade to JLine 3. If Jmxterm fails to start because of .jmxterm_history, remove your previous history file using (Unix):

rm ~/.jmxterm_history

or (Windows):

del %HOMEPATH%\.jmxterm_history

Q. Why jvms command doesn't work? What is it?

The jvms command lists all running JVM processes under the same user. This feature is not officially exposed by JavaSE, so the implementation is specific to the JDK version and OS. It depends on a JDK library that is not available in JRE. Please don't be surprised if it doesn't work on your OS or JDK version, but do let me know when it fails. Sorry for the inconvenience.

Q. Something is failing but I don't see the details, how to turn on

debugging?

In Jmxterm, run the command option -v verbose to turn on debugging.

Q. How to query a bean where name contains white space?

Use a backslash to escape any white space or special characters in the command. For example:

$> domain java.lang
#domain is set to java.lang
$> bean name=PS\ Survivor\ Space,type=MemoryPool
#bean is set to java.lang:name=PS Survivor Space,type=MemoryPool

Q. How to pass a null as a value?

The special keyword "null" is reserved to represent a null pointer. If you do want to pass a string "null", wrap the value with double quotes.

$>set anAttribute null # Sets anAttribute to be null pointer
$>set anAttribute "null" # Sets anAttribute to be string "null"

Q. Build Java application on top of Jmxterm

This topic has been discussed several times. Jmxterm does not intend to hide the JMX API from JavaSE. If you programmatically call Jmxterm in Java to make calls to an MBean server, you will find many important features missing. To interact with an MBean server in Java programming, the original JMX API in JavaSE is still the best choice.
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