how to set JAVA OPTS for Tomcat in Windows

Question

I m trying to set JAVA OPTS for Tomcat on a Windows machine  but I keep getting an error if I add more than one variable   For example  this works   set JAVA OPTS  -Xms512M    But this does not   set JAVA OPTS  -Xms512M -Xmx1024M    It results in the error   Invalid initial heap size  -Xms512M -Xmx1024M Error  Could not create the Java Virtual Machine  Error  A fatal exception has occurred  Program will exit    It s as if I can set one variable  -Xmx will also work  but not several   I m using the instructed setenv bat file and my Tomcat is 7 0 35

User · Answer

SET JAVA HOME C  Applications java java 8 SET PATH  PATH  C  Applications java java 8 bin SET JAVA OPTIONS -d64 -Xms128g -Xmx128g

User · Answer

I like a combination of Gaurav s and user2550946 s  answer best  but would like to add two more aspects     Don t use JAVA OPTS  instead use CATALINA OPTS  This will be used solely for starting tomcat  not for shutting it down  Typically you want more memory when starting tomcat  but the shutdown process  which just spins up  tells tomcat to shut down and then ends again  doesn t need any specifically tuned resources  In fact  shutdown can even fail if some ridiculous amount of memory is not available from the OS anymore   On production systems  my recommentation is to claim the maximum allowed memory immediately  Because if you anticipate that the memory will be required sooner or later  you don t want to discover it not being available at 3am in the night - rather when you start up the server  Thus  set -Xmx and -Xms to the same value in production systems   This makes my aspect 1 even more relevant    Or  in one line  here s my recommendation   set  CATALINA OPTS  CATALINA OPTS  -Xms1024M -Xmx1024M

User · Answer

This is because  the amount of memory you wish to assign for JVM is not available or may be you are assigning more than available memory  Try small size then u can see the difference  Try   set JAVA OPTS -Xms128m -Xmx512m -XX PermSize 128m

User · Answer

For Windows  in case the variable value has space      in it  the correct way is actually to place quotes    before the variable name like   set  JAVA OPTS -Xms512M -Xmx1024M

User · Answer

It is recommended that you create a file named setenv bat and place it in the Tomcat bin directory  With this file  which is run by the catalina bat and catalina sh scripts   you can change the following Tomcat environment settings with the JAVA OPTS variable   You can set the minimum and maximum memory heap size with the   JVM -Xms and -Xmx parameters    The best limits depend on many conditions  such as transformations that Integrator ETL should execute  For Information Discovery transformations  a maximum of 1 GB is recommended  For example  to set the minimum heap size to 128 MB and the maximum heap size to 1024 MB  use  JAVA OPTS -Xms128m -Xmx1024m           You should set the maximum limit of the PermGen  Permanent Generation  memory space to a size larger than the default  The default of 64 MB is not enough for enterprise applications  A suitable memory limit depends on various criteria  but 256 MB would make a good choice in most cases  If the PermGen space maximum is too low  OutOfMemoryError  PermGen space errors may occur  You can set the PermGen maximum limit with the following JVM parameter      -XX MaxPermSize 256m   For performance reasons  it is recommended that the application is run in Server mode  Apache Tomcat does not run in Server mode by default  You can set the Server mode by using the JVM -server parameter  You can set the JVM parameter in the JAVA OPTS variable in the environment variable in the setenv file   The following is an example of a setenv bat file   set  JAVA OPTS  JAVA OPTS  -Xms128m -Xmx1024m -XX MaxPermSize 256m -server

User · Answer

Apparently the correct form is without the     As in  set JAVA OPTS -Xms512M -Xmx1024M

User · Answer

Try   set JAVA OPTS  JAVA OPTS  -Xms512M -Xmx1024M

[tomcat] how to set JAVA_OPTS for Tomcat in Windows?

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