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https://issues.apache.org/jira/browse/DERBY-3731?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kristian Waagan updated DERBY-3731:
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Attachment: derby-3731-2a_update_of_policy_template.diff
Patch 2a adds the permission to read the two system properties used to
determine if the JVM is 32 or 64 bit.
Regarding documentation, all I can find are the examples in the "Derby Server
and Administration Guide", under "Running the Network Server under the security
manager". I can't find any detailed explanation of each of the permissions
granted. Have I missed them?
At the very least, I think the examples should be updated with the two new
permissions. Note that they are optional, if the permissions aren't granted
Derby will use the old heuristic.
If I don't hear anything, I'll try to update the two examples mentioned.
> Improve calculation of refSize in ClassSize.java
> -------------------------------------------------
>
> Key: DERBY-3731
> URL: https://issues.apache.org/jira/browse/DERBY-3731
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.5.0.0
> Reporter: Kathey Marsden
> Assignee: Kristian Waagan
> Priority: Minor
> Fix For: 10.4.2.1, 10.5.0.0
>
> Attachments: derby-3731-1a-refsize_from_properties.diff,
> derby-3731-1b-refsize_from_properties.diff,
> derby-3731-1b-refsize_from_properties.stat,
> derby-3731-1c-refsize_from_properties.diff,
> derby-3731-2a_update_of_policy_template.diff, DERBY-3731_diff.txt
>
>
> java/engine/org/apache/derby/iapi/services/cache/ClassSize.java has a static
> code block which calculates the size of a reference for the architecture.
> This code could be improved by adding garbage collection before measuring
> memory, to give a consistent reading. Also there have been suggestions
> that we use os.arch or sun.arch.data.model to make the measurement more
> reliable, especially on 64bit machines.
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