"Could non practice the Java virtual machine" is a full general Java Virtual Machine error when you lot run java ascendance direct or indirectly together with its non able to practice virtual machine because of invalid maximum heap size, invalid minimum heap size or only whatsoever error inwards ascendance line. This error non exclusively come upwardly when you lot run Java programme from ascendance line but every bit good when you lot run them using whatsoever IDE similar Eclipse or Netbeans. Could non practice the Java virtual machine invalid maximum heap size -Xmx is a exceptional instance for it which comes when you lot assay to run your java command amongst -Xmx selection together with value of that selection is invalid similar syntax error, value error or anything else. In this Java article nosotros volition come across pair of scenarios when you lot instruct "Could non practice the Java virtual machine Invalid maximum heap size: -Xmx" which volition assist you lot to avoid those error together with railroad train this problem.
1) You run Java ascendance amongst -Xmx together with heap size is to a greater extent than than what coffee tin receive got on that operating system.
10 points of Java heap space that maximum heap size varies based upon machine architecture e.g. 32 fleck or 64 bit, JVM fleck size e.g. 32 fleck JVM or 64 fleck JVM together with operating system. In 32 fleck machine though theoretical bound of maximum heap size is 4GB, it varies on operating organization to operating organization e.g. on 32 fleck windows XP maximum heap size limits upto 1.5G due to diverse argue acre on 64 fleck Solaris machine fifty-fifty amongst 32 fleck JVM you lot tin afford unopen to 3.5GB. So when you run next coffee ascendance inwards 32 fleck Windows XP machine, you lot volition instruct "Could non practice the Java virtual machine : Could non reserve plenty infinite for object heap" together with Error occurred during initialization of VM /java coffee -Xmx1800M Hello
Error occurred during initialization of VM
Could non reserve plenty infinite for object heap
Could non practice the Java virtual machine
2) "Could non practice the Java virtual machine : Invalid maximum heap size -Xmx" error truly comes due to syntactical error. for illustration await at the below coffee ascendance together with come across if you lot tin spot the argue of "Could non practice the Java virtual machine : Invalid maximum heap size -Xmx"
/java coffee -Xmx 1400M Hello
Could non practice the Java virtual machine.
Invalid maximum heap size: -Xmx
If you lot await carefully you lot volition infinite betwixt -Xmx together with 1800M, which is causing "Could non practice the Java virtual machine : Invalid maximum heap size -Xmx". syntactically at that spot should non hold upwardly whatsoever infinite betwixt -Xmx together with heap size. Just take the infinite betwixt -Xmx together with 1400M together with it volition work.
/java coffee -Xmx1400M Hello
Hi..... Java
Another mutual syntax error acre specifying maximum heap size is using basis lik KB, MB or GB.
/java coffee -Xmx1500MB
Could non practice the Java virtual machine.
Invalid maximum heap size: -Xmx1500MB
Java exclusively allows k or K, one thousand or thou together with g or G subsequently specifying size of heap inwards numbers e.g. -Xmx1400M is valid but -Xmx1400MB is invalid heap size.
One to a greater extent than worth noting syntax error acre providing heap infinite is infinite betwixt numeric literal together with unit, every bit shown inwards below example:
/java coffee -Xmx1500 M
Error occurred during initialization of VM
Too modest initial heap
This would non effect inwards "Could non practice the Java virtual machine : Invalid maximum heap size -Xmx" but even together with thence you lot won't hold upwardly able to get-go your coffee programme because its exclusively considering maximum heap size every bit 1500 Bytes which is ways lower than minimum default heap size. to avoid this practice non role infinite betwixt publish together with unit of measurement e.g. 1500 thou is invalid, acre 1500M is valid.
These were some of the common mistakes made yesteryear Java programmer acre specifying maximum heap size. Which eventually effect inwards "Could non practice the Java virtual machine : Invalid maximum heap size -Xmx" together with stops Java programme or application from starting.
Further Learning
Java Memory Management
How to railroad train java.lang.OutOfMemroyError inwards Java
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