Issue

This Content is from Stack Overflow. Question asked by user1999453

I am new to visualVm and trying to monitor some application which is deployed on Tomcat9 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 jdk version installed on centos server:

My tomcat is accessible from my browser as follows:

http://dymmyip:8081/

Based on the online resource I saw that 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 lastest vizualVm and created a remote host via File->Add Remote Host. Then Add JMX Connection info as follows:

connection:dymmyip:8081
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?

Thanks in advance.

Solution

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.

This Question was asked in StackOverflow by user1999453 and Answered by Stéphane Millien It is licensed under the terms of CC BY-SA 2.5. - CC BY-SA 3.0. - CC BY-SA 4.0.