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https://issues.apache.org/jira/browse/MCOMPILER-592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17851009#comment-17851009
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ASF GitHub Bot commented on MCOMPILER-592:
------------------------------------------

thijsrijpert commented on code in PR #244:
URL: 
https://github.com/apache/maven-compiler-plugin/pull/244#discussion_r1622033060


##########
src/main/java/org/apache/maven/plugin/compiler/AbstractCompilerMojo.java:
##########
@@ -1239,7 +1239,9 @@ public void execute() throws MojoExecutionException, 
CompilationFailureException
             }
         }
 
-        if (outputTimestamp != null && (outputTimestamp.length() > 1 || 
Character.isDigit(outputTimestamp.charAt(0)))) {
+        if (outputTimestamp != null
+                && !outputTimestamp.isEmpty()

Review Comment:
   Yes, I think it would be set by another plugin. The project I was working on 
has a lot of plugins, so I would not know which plugin exactly sets this value. 
When I encountered this issue, the value was not set in the projects pom, but 
it was a non-null empty string when this line was run, indicating it was set 
somewhere in the compilation process.





> 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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