How do I find what Java version Tomcat6 is using

Question

Is there a OS command to find what Java version Tomcat6 is using  I need to use a Perl  including system    command   I using Linux   Ubuntu and CentOS  Is there something like        tomcat6 version

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Or you could use the Probe application and just look at its System Info page   Much easier than writing code  and once you start using it you ll never go back to Tomcat Manager

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To find it from Windows OS     Open command prompt and change the directory to tomcat tomee  bin directory   Type catalina bat version It should print jre version details along with other informative details   Using CATALINA BASE     C  User software enterprise-server-tome     Using CATALINA HOME     C  User software enterprise-server-tome     Using CATALINA TMPDIR   C  User software enterprise-server-tome     Using JRE HOME          C  Program Files Java jdk1 8 0 25   Using CLASSPATH         C  User software enterprise-server-tome     Server version  Apache Tomcat 8 5 11  Server built    Jan 10 2017 21 02 52 UTC  Server number   8 5 11 0  OS Name         Windows 7  OS Version      6 1  Architecture    amd64  JVM Version     1 8 0 25-b18  JVM Vendor      Oracle Corporation

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You can use the Tomcat manager app to find out which JRE and OS versions Tomcat is using   Given a user tomcat with password password with a role of manager   Tomcat 6   curl http   tomcat password localhost 8080 manager serverinfo   Tomcat 7 8   curl http   tomcat password localhost 8080 manager text serverinfo

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For Windows  launch cmd prompt and route to the path usually bin  where you have your tomcat startup script   C  opt isv tomcat-7 0 grid bin gt version Using CATALINA BASE     C  opt isv tomcat-7 0 grid  Using CATALINA HOME     C  opt isv tomcat-7 0 grid  Using CATALINA TMPDIR   C  opt isv tomcat-7 0 grid temp  Using JRE HOME          C  opt isv devtools jdk1 8 0 45  Using CLASSPATH         C  opt isv tomcat-7 0 grid bin bootstrap jar C  opt isv tomcat-7 0 grid bin tomcat-juli jar  Server version  Apache Tomcat 7 0 55 Server built    Jul 18 2014 05 34 04 Server number   7 0 55 0 OS Name         Windows 7 OS Version      6 1 Architecture    x86 JVM Version     1 8 0 45-b15 JVM Vendor      Oracle Corporation C  opt isv tomcat-7 0 grid bin gt

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Once you have started tomcat simply run the following command at a terminal prompt    ps -ef   grep tomcat  This will show the process details and indicate which JVM  by folder location  is running tomcat

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usr local tomcat6 bin catalina sh version

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At first you need to understand first  that Tomcat is a Java application  So  to see which java version Tomcat is using  you can just simply find the script file from which Tomcat is started  usually catalina sh   Inside this file  you will get something like below   catalina sh     JAVA HOME       Must point at your Java Development Kit installation  catalina sh                     Defaults to JAVA HOME if empty  catalina sh     -n   JAVA HOME     amp  amp  JAVA HOME  cygpath --unix   JAVA HOME   catalina sh   JAVA HOME  cygpath --absolute --windows   JAVA HOME   catalina sh     echo  Using JAVA HOME         JAVA HOME    By default  JAVA HOME should be empty  which mean it will use the default version of java  or you can test with  echo  JAVA HOME  And then use  java -version  to see which version you default java is   And vice versa by setting this property  JAVA HOME  you can configure which Java version to use when starting Tomcat

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After installing tomcat  you can choose  configure tomcat  by search in  search programs and files   After clicking on  configure Tomcat   you should give admin permissions and the window opens  Then click on  java  tab  There you can see the JVM and JAVA classpath

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If tomcat did not start up yet   you can use the command  bin cataline version  to check which JVM will the tomcat use when you start tomcat using   bin startup   In fact   bin cataline version just call the main class of org apache catalina util ServerInfo   which is located inside the  lib catalina jar    The org apache catalina util ServerInfo  gets the JVM Version and JVM Vendor by the following commands   System out println  JVM Version     System getProperty  java runtime version     System out println  JVM Vendor     System getProperty  java vm vendor        So   if the tomcat is running   you can create a JSP page that call org apache catalina util ServerInfo or just simply call the above System getProperty   to get the JVM Version and Vendor   Deploy this JSP to the running tomcat instance and browse to it to see the result   Alternatively  you should know which port is the running tomcat instance using   So   you can use the OS command to find which process is listening to this port   For example in the window   you can use  the command netstat -aon to find out  the process ID of a process that is listening to a particular port    Then go to the window task manager to check the full file path of this process ID belongs to   The java version can then be determined from that file path

[java] How do I find what Java version Tomcat6 is using?

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