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https://issues.apache.org/jira/browse/TAP5-2529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15096159#comment-15096159
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Jochen Kemnade commented on TAP5-2529:
--------------------------------------
Given that {{null}} values in lists with more than one element are converted to
the string "null", we should return "null" for {{[ null ]}}.
> NullPointerException in
> org.apache.tapestry5.ioc.internal.util.InternalUtils.join(List)
> ---------------------------------------------------------------------------------------
>
> Key: TAP5-2529
> URL: https://issues.apache.org/jira/browse/TAP5-2529
> Project: Tapestry 5
> Issue Type: Bug
> Components: tapestry-ioc
> Affects Versions: 5.4
> Reporter: Jochen Kemnade
>
> {{InternalUtils.join(Collections.singletonList(null))}} throws a
> {{NullPointerException}} because it tries to call {{null.toString()}}:
> {noformat}
> Exception in thread "main" java.lang.NullPointerException
> at
> org.apache.tapestry5.ioc.internal.util.InternalCommonsUtils.join(InternalCommonsUtils.java:268)
> at
> org.apache.tapestry5.ioc.internal.util.InternalCommonsUtils.join(InternalCommonsUtils.java:248)
> at
> org.apache.tapestry5.ioc.internal.util.InternalUtils.join(InternalUtils.java:395)
> {noformat}
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