I can reproduce on the latest (current ones on 27th of February) versions of XWiki 15.10.6 and 16.1 with Java 21 not only by visiting Skin page, which raises same warning in logs
{code}
2024-02-27 11:56:21,842 [http-nio-7635-exec-6 - http://localhost:7635/xwiki/bin/download/XWiki/DefaultSkin/filename] WARN c.x.x.p.XWikiPluginManager - downloadAttachment failed for plugin [image]: Cannot invoke "com.xpn.xwiki.doc.XWikiAttachment.getMimeType(com.xpn.xwiki.XWikiContext)" because "attachment" is null 2024-02-27 11:56:21,842 [http-nio-7635-exec-6 - http://localhost:7635/xwiki/bin/download/XWiki/DefaultSkin/filename] WARN c.x.x.p.XWikiPluginManager - downloadAttachment failed for plugin [zipexplorer]: Cannot invoke "com.xpn.xwiki.doc.XWikiAttachment.getReference()" because "attachment" is null
{code}
But copy/paste the code below on Sandbox and adding to class XWiki.XWikiUsers empty the property image ( or any test pages you create your own class http://localhost:port/xwiki/bin/view/XWiki/XWikiClasses with property image) and click on the button "Choose an attachment". It brings the same warnings as above, plus a new one.
{code}
{{attachmentSelector classname="XWiki.XWikiUsers" property="avatar" savemode="direct"
displayImage="true" width="120" link="true" filter="png,jpg,gif"
defaultValue="XWiki.XWikiUserSheet@noavatar.png"/}}
{code}
This prints warning
{code}
2024-02-27 15:17:27,669 [qtp278934944-41 - http://192.168.150.86:8080/xwiki/bin/download/XWiki/XWikiUserSheet/noavatar.png?version=1.1&width=180&rev=1.1] WARN c.x.x.p.i.ImagePlugin - Failed to transform image attachment. java.lang.NullPointerException: Cannot invoke "java.awt.Image.getWidth(java.awt.image.ImageObserver)" because "image" is null
{code}
Note, that if I remove *displayImage="true"* my XWiki console won't have any warnings |
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