I am new to VisualVM and trying to monitor some application which is deployed on Tomcat 9 CentOS server. I have installed VisualVM on my Windows laptop and trying to remote connect to the JVM on the CentOS server, but nothing is displayed (message on VisualVM: Not supported for this JVM).
Please find below Java version installed on CentOS server:
[root@localhost bin]# java -version
java version "1.8.0_162"
Java(TM) SE Runtime Environment (build 1.8.0_162-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.162-b12, mixed mode)
Based on the online resource I saw, I need to enable JMX on Tomcat, so I have added the following properties in my setenv.sh (in tomcat/bin folder) file:
export CATALINA_OPTS="\
-Dcom.sun.management.jmxremote \
-Dcom.sun.management.jmxremote.port=8999 \
-Dcom.sun.management.jmxremote.authenticate=false \
-Dcom.sun.management.jmxremote.ssl=false"
I have downloaded the latest VisualVM and created a remote host via File->Add Remote Host. Then Add JMX Connection info as follows:
connection:dymmyip:8999
username :user
Password :dummyPassword
uncheck :do not require ssl
When I try to connect, the following screen is displayed:
Can anyone tell me please what I am missing here?
You can add the missing =true
in your setenv.sh
export CATALINA_OPTS="\
-Dcom.sun.management.jmxremote=true \
-Dcom.sun.management.jmxremote.port=8999 \
-Dcom.sun.management.jmxremote.authenticate=false \
-Dcom.sun.management.jmxremote.ssl=false \
-Dcom.sun.management.jmxremote.local.only=false"
You have to chmod
you setenv.sh
too:
$ cd <your-tomcat-dir>/bin
$ chmod a+x setenv.sh
Be sure it is not a firewall issue. Test the connection with telnet dummyip 8999
Be sure using the same JVM on both VisualVM and Tomcat. (Be careful with architecture too: 32 or 64bits)
You can get the last release of VisualVM
here.
To install it:
$ [ -f "/usr/bin/visualvm" ] && sudo mv /usr/bin/visualvm{,.old}
$ wget https://github.com/oracle/visualvm/releases/download/2.1.4/visualvm_214.zip
$ unzip visualvm_214.zip
$ sudo mv visualvm_214 /opt/
$ sudo ln -s /opt/visualvm_214/bin/visualvm /usr/bin/
$ visualvm --jdkhome /usr/lib/jvm/java-17-openjdk-amd64
Use the path you want in --jdkhome
.