When I tried to increase the JVM heap size to to 2048 Mb, it throws an exception while initializing the JVM. I have tried it on both 32-bit & 64-bit OS but was able to get the solution. Also, please tell me if installing the 64-bit JVM or JRE will solve the problem or not.
Can someone also let me know, how to find which version of JRE I'm currently running?
The memory limit is here: Java maximum memory on Windows XP
The version is java -version
Related
I have copied a jdk directory from another location. Since then, I get the following error message.
Your environment has been set.
java version "1.5.0_22"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_22-b03)
Java HotSpot(TM) Client VM (build 1.5.0_22-b03, mixed mode, sharing)
PROPS=-Xms1024m -Xmx5096m -Djavax.xml.parsers.SAXParserFactory=org.apache.xerces.jaxp.SAXParserFactoryImpl -Djavax.xml.parsers.DocumentBuilderFactory=org.apache.xerces.jaxp.DocumentBuilderFactoryImpl -Djava.ext.dirs=..;.;..\lib;..\classes -Dfile.encoding=UTF-8
CLASSPATH=C:\Oracle\MIDDLE~1\patch_wls1211\profiles\default\sys_manifest_classpath\weblogic_patch.jar;C:\PROGRA~1\Java\JDK15~1.0_2\lib\tools.jar;C:\Oracle\MIDDLE~1\WLSERV~1.1\server\lib\weblogic_sp.jar;C:\Oracle\MIDDLE~1\WLSERV~1.1\server\lib\weblogic.jar;C:\Oracle\MIDDLE~1\modules\features\weblogic.server.modules_12.1.1.0.jar;C:\Oracle\MIDDLE~1\WLSERV~1.1\server\lib\webservices.jar;C:\Oracle\MIDDLE~1\modules\ORGAPA~1.1/lib/ant-all.jar;C:\Oracle\MIDDLE~1\modules\NETSFA~1.0_1/lib/ant-contrib.jar;
Invalid maximum heap size: -Xmx5096m
The specified size exceeds the maximum representable size.
Could not create the Java virtual machine.
Does this mean I will have to re-install the jdk, and not just copy any installation directory? I'm asking this and not trying it out myself because this exercise will have to be done in a client machine.
The current machine is a Windows 2008 server and has 12GB of RAM.
You are using 32 bit VM (Java HotSpot(TM) Client VM) which can be mapped to maximum 4G (Only 2 GB in reality) 2^32 address locations Maximum Java heap size of a 32-bit JVM on a 64-bit OS
Error message suggest you are using 5GB heap memory which is not supported on 32 bit architecture
Invalid maximum heap size: -Xmx5096m
The specified size exceeds the maximum representable size.
Could not create the Java virtual machine.
You can modify the -Xmx parameter to use anythinng <=2g should work here
I just encountered the problem and solved it by downloading the windows 64-bit JAVA.
Please check whether your windows version is 32-bit or 64-bit, and download the right version of JAVA.
Our company IT recently went through an upgrade and I don't know what else they changed to the defaults but Excel 2013 32-bit (w/ MATLAB Compiler Runtime add in) crashes multiple times a day and it's driving me crazy.
I looked through the solutions to other similar questions but still having no luck. The exact error that I'm receiving is attached in the picture below. I've tried editing the environment variable to various amounts and checked that the free physical memory is available (has 16G total and usually half is free)
Running java -version in the command prompt returns:
java version "1.7.0_51"
Java(TM) SE Runtime Environment (build 1.7.0_51-b31)
Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)
The Java Control Panel Runtime Environment Settings reference javaw.exe but I changed the environment variables on both the java.exe and javaw.exe (in both Program Files and Program Files (x86).
Unable to start the JVM.
Picked up _JAVA_OPTIONS: -Xmx1024m -Xms512m
Error occurred during initialization of VM
Could not reserve enough space for budget heap
There is not enough memory to start up the Java virtual machine.
Try quitting other applications or increasing your virtual memory
It says it does not have enough space.
Change the setting for JVM Maximum Memory to 1024M
-Xmx1024m
Are there such setting for your plugin ? You might want to Google "JVM heap size settings for Excel MAtlab plugin".
Please take a look at this question as well. (Increase default heap size for windows)
Hope this helps!
We have a Java EE application that runs in JBoss 7.1.1, and, we must run it in VirtualMachines (such as VMWare ESXI).
The thing is, when we run our app in the VM, the performance is dropped by 50% approx.
Seems like the GC goes crazy... as far I can tell, when GC runs, it take much more longer
than normal to "end", and block the application meanwhile.
Have anyone else had a experience like that? Any tips, tunning or a light that I can follow?
Thanks in advance.
EDIT
JVM has Xmx and Xms = 1Gb
VM has 4Gb RAM
Ubuntu Server 64
oracle JVM 64
I would say that before moving your app to VM with configuration you posted it was running on 32bit system and 32bit jvm and using same jvm parameters.
Trick is that you moved to 64bit with 64bit java but still assigned same amount of heap size for your application, what has happened in reality is that you app now has half the memory available that it used to have.
Every object on 64bit jvm is twice the size of the one of 32bit jvm.
Given configuration you have I would suggest few solutions:
increase heap size to 2G
or use compressed oops
or install 32bit jvm
Given that your application does not have more than 1.3G assigned it think best performance would be achieved by installing 32bit jvm and running with -Xms1300m -Xmx1300m.
You can go even step futher and have 32bit VM with 32bit linux installation.
64bit jvm is only useful if you need more than 1.3G of heap otherwise it just adds too much overhead.
Also you can run jvm with
-verbose:gc -XX:+PrintGCDetails
that will show you what is happening with GC, this can further help you tune your jvm.
According to the JVM 6 documentation, server class machines receive by default an initial heap size as 1/4 RAM or 1GB. Considering our Solaris 64Bit server has 64 GB, the initial heap size will default in as 256MB. Therefore, I need to set manually the heap size using the XMX parameter for 4GB. Though, when I add "-Xmx4096M", Tomcat does not start. Here is the error message:
Invalid maximum heap size: -Xmx4096M
The specified size exceeds the maximum representable size.
Could not create the Java virtual machine.
What should be my command line parameters to allow my heap to grow up to 4GB?
Thanks for all your input, guys! Though, the output of my java -version mentions mixed mode which means that it is 64 bits. The real solution is adding -d64 to force it to run in 64 bits and therefore allocate the 4GBs.
My solution based on the comments to the question: you are using 32bit JVM therefore it can't address more than 4GB (non inclusive). Try installing the 64 bit version
According to the output of java -version, a 32 bit JVM is installed. If it was a 64bit one, you should get something like Java HotSpot(TM) 64-Bit Server VM.
Try installing a 64 bits JVM and it will solve your issue.
Use -Xmx1024M -XX:MaxPermSize=256M
Would anyone please give me ideas about forcing 64 bit jvm to run as 32-bit jvm?
I need to write a jse desktop application for bluetooth connection. For that i need to implement Bluecove jar . It has 32-bit files only. So i included -D32 under VM arguments in eclipse pulsar. But still i am getting the same error that displayed before adding the argument: bluecove_x64.dll missing. I tried with -d32, and it showed me "unrecognized option: d32".
And it seems like i should install a 32-bit jvm that would run on 64-bit os. So, can anyone please tell me what exactly should i install? Java SDK in 32-bit or Eclipse software?
Thanks in advance!
Switching modes is only possible on Solaris. A JVM is either 64bit or 32bit, except on Solaris where both run modes are available in a single JVM.
But anyway, if you don't need more than 4Gig Ram, install the 32bit JVM also on 64bit Systems, because it is 10-15% faster and needs less memory.
First, install a 32-bit JVM. (I suppose this is under Windows).
Then in Eclipse, open the Preferences panel, and go to Java -> Installed JRE's.
Click Search, tell it to search your harddisk.
Wait.
You should now see both your original 64-bit JVM and your new 32-bit JVM in the list. Put the checkmark on the 32-bit JVM instead of the 64-bit JVM. Click OK.
You should now use a 32-bit JVM in Eclipse, which should be compatible with the library you have.