Invalid Initial Together With Maximum Heap Size Inwards Jvm - How To Fix
Sunday, June 17, 2018
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I was getting "Invalid initial heap size: -Xms=1024M" acre starting JVM together with fifty-fifty afterward changing maximum heap size from 1024 to 512M it hand away on crashing past times telling "Invalid initial heap size: -Xms=512m , Could non practise the Java virtual machine". I cheque around everything starting from checking how much physical retentivity my machine has to whatsoever typo inwards JVM parameters, exclusively to discovery out that instead of M, I had position MB there. Java accepts both pocket-size example together with the majuscule example for Kilo, Mega, together with Gigs. you lot tin terminate purpose one thousand or M, g or G etc but never used MB, GB or KB. Similar occupation tin terminate occur alongside maximum heap size specified past times -Xmx. Also from Java half dozen update 18, at that topographic point is alter on default heap size inwards JVM.
Invalid initial together with maximum heap size inwards JVM
Here is a listing of mutual errors acre specifying maximum together with minimum heap size inwards Java :
java -Xmx4056M -Xms4056M HelloWorld
Issue: Error occurred during initialization of VM , The size of the object heap + VM information exceeds the maximum representable size
Cause: the value of either -Xms or -Xmx is higher than or to a greater extent than or less the size of physical memory, every bit my machine has 4GB memory.
java -Xmx1056M -Xms2056M HelloWorld
Issue: Error occurred during initialization of VM , Incompatible minimum, together with maximum heap sizes specified
Cause: value of -Xms is higher than -Xmx
java -Xms2056M HelloWorld
Issue: Error occurred during initialization of VM , Could non reserve plenty infinite for object heap
Cause: Only -Xms was provided together with -Xmx was non provided. you lot volition also teach this fault if you lot guide maintain a typo together with instead of -Xmx you lot guide maintain specified -Xms 2 times, happened to my friend final time.
Command: java -Xms1024 grand -Xmx1024M HelloWorld
Issue: Error occurred during initialization of VM , Too pocket-size initial heap
Cause: If you lot had infinite betwixt 1024 together with grand than JVM assumes the size of -Xms every bit 1024 bytes exclusively together with impress fault that it's every bit good pocket-size for JVM to start.
Invalid heap size
Another scenario when "invalid heap size" issue comes acre restarting JVM is, when you lot configure 64 fighting JVM to guide maintain retentivity to a greater extent than than 4GB but its running on 32 fighting information model. This "invalid heap size" occurs especially inwards Solaris box where J2SE installation continas both 32 fighting together with 64 fighting J2SE implementation. On other environs similar Windows together with Linux 32 fighting together with 64 fighting JVM are installed separately. 64 fighting JVM installed on Solaris machines runs alongside 32 fighting model if you lot don't specify either -d32 or -d64, which won't guide maintain Maximum heap size of 4GB, thence "invalid heap size". You tin terminate resolve this effect past times running Solaris JVM alongside selection -d64. -d64 ascendency business selection allows JVM to purpose 64 fighting information model if available.public class HelloWorld{ public static void main(String args[]){ System.out.println("HelloWorld to Java"); } }
$ test@nykdev32: coffee -version coffee version "1.6.0_14" Java(TM) SE Runtime Environment (build 1.6.0_14-b08) Java HotSpot(TM) Server VM (build 14.0-b16, mixed mode) $ test@nykdev32: coffee -Xmx4096M HelloWorld Invalid maximum heap size: -Xmx4096M The specified size exceeds the maximum representable size. Could non practise the Java virtual machine. $ test@nykdev32: coffee -d64 -Xmx4096M HelloWorld HelloWorld to Java
If you lot run Java programme from ascendency business so you lot volition also teach message tell Could non practise the Java virtual machine with each of invalid heap fault but if you lot run your programme from Eclipse you lot volition non teach message "Could non practise the Java virtual machine", instead, you lot volition simply come across fault message inwards console.
Regarding default heap size inwards Java, from Java half dozen update xviii at that topographic point are meaning changes inwards how JVM calculates default heap size inwards 32 together with 64-bit machine together with on customer together with server JVM mode:
1) Initial heap infinite together with maximum heap infinite is larger for improved performance.
2) Default maximum heap infinite is 1/2 of physical retentivity of size upwards to 192 bytes together with 1/4th of physical retentivity for size upwards to 1G. So for 1G machine maximum heap size is 256MB 2.maximum heap size volition non travel used until programme creates plenty object to fill upwards initial heap infinite which volition travel much lesser but at-least 8 MB or 1/64th business office of Physical retentivity upwards to 1G.
3) For Server Java virtual machine default maximum heap infinite is 1G for 4GB of physical retentivity on a 32 fighting JVM. for 64 fighting JVM its 32G for a physical retentivity of 128GB.
Further Learning
Java Memory Management
How Garbage collection plant inwards Java
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