Tomcat sets JAVA_HOME to point at JRE rather than JDK

Question

I'm using JavaMelody on Tomcat 7 in order to monitor memory usage. When I fire up Tomcat and navigate to the /monitoring page, all is fine and dandy. However, when I try and generate a Memory Histogram, a pop-up appears informing me that 'Memory histogram is not supported because the server uses the JRE and not the JDK. This is confirmed in the start up section of the logs:

INFO: Java Home: C:\Program Files\Java\jdk1.8.0_151\jre

However, my JAVA_HOME variable is set to C:\Program Files\Java\jdk1.8.0_151\ Why does Tomcat append 'jre' to the JAVA_HOME, and how do I stop it from doing it?

Thanks

Angus

How do you start your tomcat? Is there any kind of script, windows service definition, etc.? Maybe we would need more information on that — Jorge_B, Apr 06 '18 at 07:08

score 2 · Answer 1 · answered Apr 06 '18 at 07:12

Looking at the catalina.bat start script of tomcat 7:

rem   JAVA_HOME       Must point at your Java Development Kit installation.
rem                   Required to run the with the "debug" argument.
rem
rem   JRE_HOME        Must point at your Java Runtime installation.
rem                   Defaults to JAVA_HOME if empty. If JRE_HOME and JAVA_HOME
rem                   are both set, JRE_HOME is used.

Please check if you have set a JRE_HOME variable, because that would explain your problem

Tomcat sets JAVA_HOME to point at JRE rather than JDK

1 Answers1