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  1. JDK
  2. JDK-8149088

Differences in the availability of memory between JRE and JDK.

    Details

    • Subcomponent:
    • CPU:
      x86
    • OS:
      windows_8

      Description

      FULL PRODUCT VERSION :
      JRE 1.8.0.71 (but we weal with it half a year, so how old is current version, maybe it was in previous versions too); JDK several 1.8 and 1.7 versions.

      ADDITIONAL OS VERSION INFORMATION :
      Not OS specific, tested on multiple OS including Windows 7 64bit, Windows 8 64bit...

      EXTRA RELEVANT SYSTEM CONFIGURATION :
      Tested on several machines (at least 8) including several laptops and several PCs.

      A DESCRIPTION OF THE PROBLEM :
      If installed JRE only, it assign only 300MB; and it does not allow to assign (-Xmx) more than 1.2GB - much less than the size of RAM is (8GB on 64bit OS).
      If installed JDK, memory management behaves correctly, it assign 25% of RAM; and it can be assigned (-Xmx parameter) whole RAM [even 15x more than the RAM size is].

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Run "java -Xmx3G -jar [any .jar file]" on machine with JRE only

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      Automatically assign 25% of RAM and allow to assign whole RAM
      ACTUAL -
      Automatically assigned 300MB (25% of 1.2GB) and allowed to assign 1.2GB

      ERROR MESSAGES/STACK TRACES THAT OCCUR :
      Stadard errors if too much memory assigned like:
      Error occurred during initialization of VM
      Unable to allocate ---KB card tables for parallel garbage collection for the requested ---KB heap. /*** OR ***/ Unable to allocate ---KB bitmaps for parallel garbage collection for the requested ---KB heap.
      Error: Could not create the Java Virtual Machine.
      Error: A fatal exception has occurred. Program will exit.



      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      java -Xmx6G -jar [any .jar file]
      ---------- END SOURCE ----------

      CUSTOMER SUBMITTED WORKAROUND :
      Uninstall JRE and subsequently install JDK

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              • Assignee:
                aroy Abhijit Roy (Inactive)
                Reporter:
                webbuggrp Webbug Group
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                Dates

                • Created:
                  Updated:
                  Resolved: