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Editorial Team
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Asked: 2026-06-19T01:39:36+00:00

I know this is a common question/problem. I’m wondering where to get started with

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I know this is a common question/problem. I’m wondering where to get started with it.

Running java on windows server 2008, we have 65GB memory, and it shows 25GB free. (Currently a couple of guys are running processes).

systeminfo | grep -i memory

shows:

Total Physical Memory: 65, 536 MB
Available Physical Memory: 26,512MB
Virtual Memory: Max Size 69,630 MB
Virtual Memory: Available 299 MB
Virtual Memory: In Use: 69, 331 MB.

Really just wondering how I go about solving this problem.

  • Where do I start?
  • What does it mean that more virtual memory is being
    used than physical memory, and is this why java won’t start?
  • Does
    java want to use virtual memory rather than physical memory?

java -version

gives me:

Error occured during initialization of VM
could not reserve enough space for object heap

More specific questions:

  • Why doesn’t the JVM want to use the free phsyical memory?
  • How much memory does a java command (like java -version) want to use if you don’t specify Xms parameters?
  • Would simply assigning more virtual memory be a good solution to the problem?
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1 Answer

  1. Editorial Team

    As I discovered when I had a similar problem (though with a lot less memory on the system — see Cannot run a 64-bit JVM in 64-bit Windows 7 with a large heap size), on Windows the JVM will try to allocate a contiguous block of memory.

    So my bet is that while you have enough total memory, you don’t have enough contiguous memory.

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