Jelastic GC代理不适用于Tomcat 8.5.x.

Question

I use Jelastic platform from different providers: dogado.de (Jelastic version is 4.6.2) and mirhosting.com (Jelastic version is 4.6.1). I have some environments on both platforms. These environments have next configuration:

• Java 8
• Apache Tomcat 8.5.3
• MySQL 5.7.10

The Tomcat prints next info to the log file:

• Server version: Apache Tomcat/8.5.3
• Server number: 8.5.3.0
• OS Name: Linux
• OS Version: 2.6.32-042stab113.21
• Architecture: amd64
• Java Home: /usr/java/jdk1.8.0_72/jre
• JVM Version: 1.8.0_72-b15
• JVM Vendor: Oracle Corporation
• CATALINA_BASE: /opt/repo/versions/8.5.3
• CATALINA_HOME: /opt/repo/versions/8.5.3

I'm trying to enable Jelastic GC agent . So I changed the conf/variables.conf file, so now it contains next lines:

-javaagent:/opt/repo/versions/8.5.3/lib/jelastic-gc-agent.jar=debug=true,period=60

It means that the debug mode should be enabled now and the agent must print every 60 seconds the info about memory releasing. For previous Tomcat version (7.0.39; on the same platform, but another environment) it looks like this:

Jul 14, 2016 6:08:30 PM com.jelastic.java.gc.JelasticGCAgent$1 run
INFO: JelasticGCAgent - Start Full GC : [free memory] : 181834896 bytes
Jul 14, 2016 6:08:30 PM com.jelastic.java.gc.JelasticGCAgent$1 run
INFO: JelasticGCAgent - Finish Full GC : [free memory] : 74885120 bytes

But it does not work for Tomcat 8: memory usage is not changing at all time, there are no any new messages in the log file. I asked supports of these providers how to fix this issue, but the issue still there. And even more it looks like a bug in Jelastic agent or in the whole platform.

Did anybody face with the same issue already? Any known ways to fix it? Maybe I need to use another jar files?

Any ideas are welcome and of course I want to ask Jelastic team about this problem.

Answer 1

It seems to be a problem with configuration file for variables parsing.

As a workaround:

1. log into your Tomcat node via SSH
2. navigate to /opt/repo/versions/8.5.3/bin/
3. edit variablesparser.sh file and change the third line from

CONFFILE='/opt/repo/versions/${Version}/conf/variables.conf'

to

CONFFILE="/opt/repo/versions/${Version}/conf/variables.conf"

4. restart Tomcat