Develop Reference

Gradle/Java getting "mystery options" out of nowhere

I have a project in IntelliJ IDEA with some Gradle tasks. Whenever I run one of the tasks, it will initialize then throw me this error:
Error: A fatal exception has occurred. Program will exit.
Error: A fatal exception has occurred. Program will exit.
Invalid maximum heap size: -Xmx4G
The specified size exceeds the maximum representable size.
The culprit here is that somewhere I am setting an option -Xmx4G but I cannot figure out where. My _JAVA_OPTIONS is set to -Xmx1200M -Xms1200M however it is completely ignoring this. I am using java jdk1.8_211.
I have tried setting a gradle.properties, changing the system-wide gradle.properties, changing _JAVA_OPTIONS and using a different JDK but I can't get it.
Could someone help me find where this option is set?

Apache Tomcat Server OutOfMemoryError [duplicate]

I have this VM with tomcat, java, and grails in it. I've been getting permgen errors so I looked around and found the solution:
set JAVA_OPTS="-Xms256m -Xmx1024m -XX:PermSize=512m -XX:MaxPermSize=512m"
I use SSH to access the vm and type the arguments above. I suppose that would fix the problem. Thing is, I wanted to make sure that I did it correctly. So I searched again on how I could check the current permSize and this is the solution I got:
jinfo -flag MaxPermSize 6444
6444 is the pid, and as a response, I got this.
-XX:MaxPermSize=85983232
Question: Is the value of the maxPermSize in bytes? because, if it is, then that would mean that the java_opts command didn't work. I am expecting to get 512m but 85983232 bytes = 82 mb.. Or am I seeing it wrong..? Can anybody enlighten me on this? D:

You have to change the values in the CATALINA_OPTS option defined in the Tomcat Catalina start file. To increase the PermGen memory change the value of the MaxPermSize variable, otherwise change the value of the Xmx variable.
Linux & Mac OS: Open or create setenv.sh file placed in the "bin" directory. You have to apply the changes to this line:
export CATALINA_OPTS="$CATALINA_OPTS -server -Xms256m -Xmx1024m -XX:PermSize=512m -XX:MaxPermSize=512m"
Windows:
Open or create the setenv.bat file placed in the "bin" directory:
set CATALINA_OPTS=-server -Xms256m -Xmx1024m -XX:PermSize=512m -XX:MaxPermSize=512m

Don't put the environment configuration in catalina.bat/catalina.sh. Instead you should create a new file in CATALINA_BASE\bin\setenv.bat to keep your customizations separate of tomcat installation.

So you are doing the right thing concerning "-XX:MaxPermSize=512m": it is indeed the correct syntax. You could try to set these options directly to the Catalyna server files so they are used on server start.
Maybe this post will help you!
How to make sure that Tomcat6 reads CATALINA_OPTS on Windows?

Completely removed from java 8 +
Partially removed from java 7 (interned Strings for example)
source

JVM heap memory

Do we need to mandatory specify JVM heap memory arguments in bat file while calling .jar file?
For example:
start /b "" "jre7\bin\javaw.exe" -Xmx1G -jar XYZ.jar
I have the scenario that in some machine when I explicitly specify the arguments(as above) then Java fatal exception is generated!
enter image description here
Error Message:
"Java virtual machine Launcher:
Error: Could not create Java virtual machine.
Error: A fatal exception has occurred. Program will exit."
But when I remove the arguments then no error is reported.
Please anyone let me know. Thank you.

Xmx is an optional argument that specifies the maximum heap size that can be used by Java. It is not required.
If you specify too large a number, you may get a fatal exception. If you don't specify an option, java chooses the max heap size. You can find the default value of this on linux by running 'java -XX:+PrintFlagsFinal -version | grep MaxHeapSize'

You need to update the windows environment variables _JAVA_OPTIONS and set Xmx1024M there. Once done you can start your JVM just fine.

-XX:MaxPermSize=128m: command not found when setting MaxPermSize on linux server

Getting this kind of error on linux server in my project when i run my spring-hibernate project
i read the
Increase permgen space
someone replied to execute
-XX:MaxPermSize=128m
to increase of MaxPermSize but when i execute this command in in my
project under directory of classes i got an error
[root#server classes]# -XX:MaxPermSize=128m
-bash: -XX:MaxPermSize=128m: command not found
Initial SessionFactory creation failed.java.lang.OutOfMemoryError: PermGen space
How can I set MaxPermSize only for one particular project as I am working on live server some projects are live on that server so please suggest me right solution so that I can set MaxPermSize on live server

You misunderstood the answer on the original question.
When you run a Java program, you use a command like:
java [JVM arguments] ClassName [program arguments]
The --XX:MaxPermSize=128m part goes in the "JVM arguments" part - it is a directive to the JVM to allocate 128m of memory to the PermGen.
So you are supposed to edit the java command in your script and not put that argument on a separate line.
You should also consider upgrading to Java 8, in which Permgen no longer exists.

-XX:MaxPermSize=128m is a JVM argument, not a bash command.

Problems with java heap space, how to increas the heap size?

I'm running a ".bat" file which points to asant:
C:\Sun\SDK\bin\asant Startbds
asant again points to a xml file i've got, build.xml:
<target name="Startbds" description="Start bds">
This has been fine for now, but now i have added more data, which leads to an out of memory error:
java.lang.outOfMemoryError: Java heap space
So i've tried to increase the heap space by various methods i've found while searching around for a solution:
cmd: set ANT_OPTS=-Xms512m -Xmx512m (did not work, same error message)
Editing the asant.bat where i edited the line "-set ANT_OPTS" from
.
set ANT_OPTS="-Dos.name=Windows_NT" -Djava.library.path=%AS_INSTALL%\lib;%AS_ICU_LIB%;%AS_NSS%" "-Dcom.sun.aas.installRoot=%AS_INSTALL%" "-Dcom.sun.aas.instanceRoot=%AS_INSTALL%" "-Dcom.sun.aas.instanceName=server" "-Dcom.sun.aas.configRoot=%AS_CONFIG%" "-Dcom.sun.aas.processLauncher=SE" "-Dderby.root=%AS_DERBY_INSTALL%"
TO
set ANT_OPTS="-Xms512m -Xmx512m" "-Dos.name=Windows_NT" -Djava.library.path=%AS_INSTALL%\lib;%AS_ICU_LIB%;%AS_NSS%" "-Dcom.sun.aas.installRoot=%AS_INSTALL%" "-Dcom.sun.aas.instanceRoot=%AS_INSTALL%" "-Dcom.sun.aas.instanceName=server" "-Dcom.sun.aas.configRoot=%AS_CONFIG%" "-Dcom.sun.aas.processLauncher=SE" "-Dderby.root=%AS_DERBY_INSTALL%"
but this gave me the error message:
"Invalid initial heap size: -Xms512m -Xmx512m
Could not create the Java virtual machine."
Anyone got an idea of how i should increase the heapsize?
And maybe also give a pointer to where i can find a tool to watch the heapsize.
Thanks in advance.

By using "-Xms512m -Xmx512m" you gave a single argument. -Xms expects the minimum heap size to be specified by the rest of the argument. So you defined the minimum heap size to be "512m -Xmx512m", which is not a valid value.
You will want to provide those switches as two arguments:
set ANT_OPTS=-Xms512m -Xmx512m "-Dos.name=Windows_NT" ...

I think that if you're in windows, you don't need the double quotes in your set.
Here is an example I saw somewhere:
set ANT_OPTS=-Xms512m -Xmx512m (Windows)
export ANT_OPTS="-Xms512m -Xmx512m" (ksh/bash)
setenv ANT_OPTS "-Xms512m -Xmx512m" (tcsh/csh)
As for monitoring heap usage, if you are using the most recent JDK on Windows, you should have Sun's VisualVM.

In eclipse -> window -> preferences -> Tomcat -> JVM Setting -> Append to JVM Parameters:
-XX:MaxPermSize=512m
-Xms512m
-Xmx512m