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https://issues.apache.org/jira/browse/MCOMPILER-592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17887150#comment-17887150
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Sergey Ponomarev commented on MCOMPILER-592:
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This was fixed and merged so can be closed.
But I think we should remove the useless validation that caused the exception
https://github.com/apache/maven-compiler-plugin/pull/266
> IndexOutOfBoundsException when project.build.outputTimestamp is empty
> ---------------------------------------------------------------------
>
> Key: MCOMPILER-592
> URL: https://issues.apache.org/jira/browse/MCOMPILER-592
> Project: Maven Compiler Plugin
> Issue Type: Bug
> Affects Versions: 3.12.0, 3.12.1, 3.13.0
> Reporter: Thijs Rijpert
> Priority: Minor
>
> Due to a combination of plugins, it is possible for the
> project.build.outputTimestamp property to have an empty string as a value.
> This causes an IndexOutOfBoundsException on line 1242 when it tries to access
> the first character in the string.
> This can be fixed by doing an isEmpty check before doing the charAt check. I
> will create an PR for this.
> While this bug is caused by another plugin, I think this should be fixed in
> the compiler because the error returned (IndexOutOfBoundsException), is vague
> and hard to debug.
> The workaround for this issue is setting the project.build.outputTimestamp
> property with an arbitrary value.
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