[Problem solving] Tomcat: Settings after line breaks in "Java Options" are not reflected
environment
- Tomcat 8.5
- Windows10
- Java8
What you want to achieve
I want to output the GC log.
Define the setting to output GC log in Java Options of Tomcat.
To set Java Options, open tomcat8w.exe and select" Java tab-> Java Options ".
problem
Added the option to output GC log to "Java Options" of Tomcat. At this time, I added a line break to distinguish it from the originally set option.
JavaOptions
-Dcatalina.home=C:\Program Files\Apache Software Foundation\Tomcat 8.5
-Dcatalina.base=C:\Program Files\Apache Software Foundation\Tomcat 8.5
-Djava.io.tmpdir=C:\Program Files\Apache Software Foundation\Tomcat 8.5\temp
-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
-Djava.util.logging.config.file=C:\Program Files\Apache Software Foundation\Tomcat 8.5\conf\logging.properties
-verbose:gc
-Xloggc:/tmp/gclog_%t_%p.txt
I pressed the "Apply" button and restarted tomcat (press the stop button and then the start button), but there was no GC log in the / tmp folder.
Also, when I closed tomcat8w.exe and reopened it, the GC log settings disappeared from Java Options.
Confirmation of problem
I checked catalina.yyyy-mm-dd.log in C: \ Program Files \ Apache Software Foundation \ Tomcat 8.5 \ logs.
The "Command line argument" part was as follows.
- To make the log easier to see, the time stamp and class name at the beginning have been removed.
txt:catalina.2018-01-01.log
Command line argument: -Dcatalina.home=C:\Program Files\Apache Software Foundation\Tomcat 8.5
Command line argument: -Dcatalina.base=C:\Program Files\Apache Software Foundation\Tomcat 8.5
Command line argument: -Djava.io.tmpdir=C:\Program Files\Apache Software Foundation\Tomcat 8.5\temp
Command line argument: -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
Command line argument: -Djava.util.logging.config.file=C:\Program Files\Apache Software Foundation\Tomcat 8.5\conf\logging.properties
Command line argument: exit
Command line argument: abort
Command line argument: -Xms128m
Command line argument: -Xmx256m
Next to -Djava.util.logging.config.file, there were ʻexit and ʻabort, and there was no GC log setting.
Apparently, if there is a line break in Java Options, it will end there.
solution
Removed line breaks from Java Options.
javaoptions
-Dcatalina.home=C:\Program Files\Apache Software Foundation\Tomcat 8.5
-Dcatalina.base=C:\Program Files\Apache Software Foundation\Tomcat 8.5
-Djava.io.tmpdir=C:\Program Files\Apache Software Foundation\Tomcat 8.5\temp
-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
-Djava.util.logging.config.file=C:\Program Files\Apache Software Foundation\Tomcat 8.5\conf\logging.properties
-verbose:gc
-Xloggc:/tmp/gclog_%t_%p.txt
catalina-2018-01-01.log
Command line argument: -Dcatalina.home=C:\Program Files\Apache Software Foundation\Tomcat 8.5
Command line argument: -Dcatalina.base=C:\Program Files\Apache Software Foundation\Tomcat 8.5
Command line argument: -Djava.io.tmpdir=C:\Program Files\Apache Software Foundation\Tomcat 8.5\temp
Command line argument: -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
Command line argument: -Djava.util.logging.config.file=C:\Program Files\Apache Software Foundation\Tomcat 8.5\conf\logging.properties
Command line argument: -verbose:gc
Command line argument: -Xloggc:/tmp/gclog_%t_%p.txt
Command line argument: exit
Command line argument: abort
Command line argument: -Xms128m
Command line argument: -Xmx256m
The GC Log settings were described in catalina-yyyy-mm-dd.log.
Then, a GC log named gclog_2018-01-01_15-39-23_pid18096.txt was output to the / tmp folder.
Remarks
Obviously, if you don't press the "Apply" button in the Tomcat settings dialog, the Java Option changes will not take effect. I forgot to press the Apply button and was a little worried, "Why isn't it reflected?"
Summary
Do not include line breaks in Tomcat Java Options.