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https://issues.apache.org/jira/browse/DERBY-7126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17434989#comment-17434989
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Richard N. Hillegas commented on DERBY-7126:
--------------------------------------------

I may have figured out how to simulate the old behavior. I took the regenerated 
jar file and replaced the emc class with the corrupted version from the old 
corrupted jar. Then I replaced the old corrupted jar with the result. The 
result is a hacked jar which does not match its modern certificate. The test 
now runs cleanly on JDK 18 and JDK 11.

But I am still confused about the value of the JDK 18 behavior and the value of 
Derby's support for signed jars.

> Make it possible to build and test Derby cleanly with OpenJDK 18
> ----------------------------------------------------------------
>
>                 Key: DERBY-7126
>                 URL: https://issues.apache.org/jira/browse/DERBY-7126
>             Project: Derby
>          Issue Type: Task
>          Components: Build tools
>    Affects Versions: 10.16.0.0
>            Reporter: Richard N. Hillegas
>            Assignee: Richard N. Hillegas
>            Priority: Major
>         Attachments: DERBY_7126_A.java
>
>
> Releases of Open JDK 18 can be found at https://jdk.java.net/178. We should 
> adjust Derby as necessary so that it builds cleanly (including javadoc) and 
> tests cleanly with this version of the platform.



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