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https://issues.apache.org/jira/browse/WW-4974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16668702#comment-16668702
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Stefaan Dutry commented on WW-4974:
-----------------------------------
{{DefaultStaticContentLoader}} used to be a singleton bean, now it creates a
new instance without calling the {{setHostConfig}} method on the new instance
causing the {{pathPrefixes}} variable to be {{null}}.
This when {{struts.devMode}} is set to {{true}}
> NullPointerException in DefaultStaticContentLoader#findStaticResource
> ---------------------------------------------------------------------
>
> Key: WW-4974
> URL: https://issues.apache.org/jira/browse/WW-4974
> Project: Struts 2
> Issue Type: Bug
> Affects Versions: 2.5.18
> Environment: Tomcat 9 on Ubuntu 18 Java 8 struts 2.5.18
> Reporter: nikos dimitrakas
> Priority: Major
>
> pathPrefixes is null. The defaults that were loaded correctly in previous
> versions are now not loaded. The method setHostConfig does not get called
> like in previous versions.
> This causes all js files to not be found. For example
> /struts/js/base/version.min.js
> /struts/js/base/jquery-2.2.4.min.js
> /struts/js/struts2/jquery.ui.struts2.min.js
> /struts/js/struts2/jquery.datatables.struts2.min.js
> /struts/js/plugins/jquery.dataTables.min.js
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