java.lang.OutOfMemoryError: Direct buffer memory

[nhthong2001]

Environment Details

• MicroStream Version: 07.01.00-MS-GA
• JDK version: 11
• OS: Windows 10
• Used frameworks: Micronaut
• VM options: -Xmx200m -Xms200m

  Describe the bug

  First I load 1 Lazy<byte[]> onto Ram. Then I unloaded this Lazy<byte[]> out of Ram by Lazy.clear() then I perform GC to free up Ram space. Next I call the function to reload this Lazy<byte[]> then the below error occurs even though my current free Ram space is enough for this load. I call it again and it doesn't throw an error and my function returns the result.

Expected behavior

No error java.lang.OutOfMemoryError: Direct buffer memory

Screenshots

[hg-ms]

This error is caused by the very low memory available to the VM. Microstream heavily relies on DirectByteBuffers that use off-heap Memory. In your case the maximum amount of memory allowed for those buffers has been exceeded temporarily. The available memory for those buffers can be configured with -XX:MaxDirectMemorySize=size. The default value may depend on the VM but most likely it is the same as the max Heap Size if specified via -Xmx.