There are lots of questions that ask this or a similar question.
They all give the command that has to be executed, what I don't understand is where do I write this command. I want to permanently increase the heap space for my tomcat apps.
I read this page http://javahowto.blogspot.com/2006/06/6-common-errors-in-setting-java-heap.html and it says under the Tomcat section
Stop Tomcat server, set environment variable CATALINA_OPTS, and then restart Tomcat. Look at the file tomcat-install/bin/catalina.sh or catalina.bat for how this variable is used. For example,
set CATALINA_OPTS=-Xms512m -Xmx512m (Windows, no "" around the value)
export CATALINA_OPTS="-Xms512m -Xmx512m" (ksh/bash, "" around the value)
setenv CATALINA_OPTS "-Xms512m -Xmx512m" (tcsh/csh, "" around the value)
So I replaced the line
set CATALINA_OPTS=
with
set CATALINA_OPTS=-Xms512m -Xmx512m
But I still get the error.
javax.servlet.ServletException: Servlet execution threw an exception
root cause
java.lang.OutOfMemoryError: Java heap space java.lang.reflect.Array.multiNewArray(Native Method) java.lang.reflect.Array.newInstance(Array.java:90) nom.tam.util.ArrayFuncs.newInstance(ArrayFuncs.java:1028) nom.tam.fits.ImageData.read(ImageData.java:259) nom.tam.fits.Fits.readHDU(Fits.java:573) controller.UploadServlet.retreiveFITSFileFields(UploadServlet.java:206) controller.ScanServerFiles.doPost(ScanServerFiles.java:39) javax.servlet.http.HttpServlet.service(HttpServlet.java:637) javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
This question is related to
java
tomcat
heap-memory
Your change may well be working. Does your application need a lot of memory - the stack trace shows some Image related features.
I'm guessing that the error either happens right away, with a large file, or happens later after several requests.
If the error happens right away, then you can increase memory still further, or investigate find out why so much memory is needed for one file.
If the error happens after several requests, then you could have a memory leak - where objects are not being reclaimed by the garbage collector. Using a tool like JProfiler can help you monitor how much memory is being used by your VM and can help you see what is using that memory and why objects are not being reclaimed by the garbage collector.
First of all you cannot change the memory settings only for a tomcat application but rather for all tomcat instance.
If you are running tomcat from console (using startup.bat) you'll need to edit catalina.bat and play around with CATALINA_OPTS. For example:
set CATALINA_OPTS=-Xms512m -Xmx512m
Restarting tomcat will apply the new settings.
If you are still getting OutOfMemoryError you need to know how much memory does your application need at that particular moment (nom.tam.util.ArrayFuncs...). You'll either have to optimize the application or simply increase the memory provided to tomcat.
There is a mechanism to do it without modifying any files that are in the distribution. You can create a separate file %CATALINA_HOME%\bin\setenv.bat or $CATALINA_HOME/bin/setenv.sh and put your environment variables there. Further, the memory settings apply to the JVM, not Tomcat, so I'd set the JAVA_OPTS variable instead:
set JAVA_OPTS=-Xmx512m
Here you can add in VM arguments after endorsed
-Xms64m -Xmx256m
You need to add the following lines in your catalina.sh file.
export CATALINA_OPTS="-Xms512M -Xmx1024M"
UPDATE : catalina.sh content clearly says -
Do not set the variables in this script. Instead put them into a script setenv.sh in CATALINA_BASE/bin to keep your customizations separate.
So you can add above in setenv.sh instead (create a file if it does not exist).
you can set this in catalina.sh as CATALINA_OPTS=-Xms512m -Xmx512m
Open your tomcat-dir/bin/catalina.sh file and add following line anywhere -
CATALINA_OPTS="$CATALINA_OPTS -Xms1024m -Xmx3024m"
and restart your tomcat
Easiest way of doing is: (In Linux/Ububuntu e.t.c)
Go to tomcat bin directory:
cd /opt/tomcat8.5/bin
create new file under bin directory "setenv.sh" and save below mention entries in it.
export CATALINA_OPTS="$CATALINA_OPTS -Xms512m"
export CATALINA_OPTS="$CATALINA_OPTS -Xmx2048m"
export CATALINA_OPTS="$CATALINA_OPTS -XX:MaxPermSize=256m"
and issue command:
./catalina.sh run
In your catalina log file you can see entry like this:
INFO [main] VersionLoggerListener.log Command line argument: -Xms512m
INFO [main] VersionLoggerListener.log Command line argument: -Xmx2048m
INFO [main] VersionLoggerListener.log Command line argument: -XX:MaxPermSize=256m
Which confirms that above changes took place.
Also, the value of "Xms512m" and "-Xmx2048m" can be modified accordingly in the setenv.sh file.
Startup of tomcat could be done in two steps as well. cd /opt/tomcat8.5/bin
Step #1
run ./setenv.sh
Step #2
./startup.sh
If you're using systemd edit:
/usr/lib/systemd/system/tomcat8.service
and set
Environment=CATALINA_OPTS="-Xms512M -Xmx2048M -XX:MaxPermSize=256m"
Just set this extra line in catalina.bat file
LINE NO AROUND: 143
set "CATALINA_OPTS=-Xms512m -Xmx512m"
And restart Tomcat service
if you are using Windows, it's very simple. Just go to System Environnement variables (right-clic Computer > Properties > Advanced System Parameters > Environnement Variables); create a new system variable with name = CATALINA_OPTS and value = -Xms512m -Xmx1024m. restart Tomcat and enjoy!
For Windows Service, you need to run tomcat9w.exe (or 6w/7w/8w) depending on your version of tomcat. First, make sure tomcat is stopped. Then double click on tomcat9w.exe. Navigate to the Java tab. If you know you have 64 bit Windows with 64 bit Java and 64 bit Tomcat, then feel free to set the memory higher than 512. You'll need to do some task manager monitoring to determine how high to set it. For most apps developed in 2019... I'd recommend an initial memory pool of 1024, and the maximum memory pool of 2048. Of course if your computer has tons of RAM... feel free to go as high as you want. Also, see this answer: How to increase Maximum Memory Pool Size? Apache Tomcat 9
Source: Stackoverflow.com