Error about com.xwiki.macros.internal.ViewFileDisplay while upgrading

[michitux]

While upgrading an existing installation of the Pro Macros 1.17.3 to version 1.19.6 on XWiki 16.5.0, I got the following error:

Installing document [Home » Confluence » Macros » ViewFile]
com.xwiki.macros.internal.ViewFileDisplay
class java.lang.ClassNotFoundException: com.xwiki.macros.internal.ViewFileDisplay
    at java.base/java.net.URLClassLoader.findClass(Unknown Source)
    at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
    at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
    at org.xwiki.classloader.xwiki.internal.ContextNamespaceURLClassLoader.loadClass(ContextNamespaceURLClassLoader.java:176)
    at java.base/java.lang.Class.forName0(Native Method)
    at java.base/java.lang.Class.forName(Unknown Source)
    at org.xwiki.component.util.ReflectionUtils.unserializeType(ReflectionUtils.java:548)
    at org.xwiki.rendering.wikimacro.internal.DefaultWikiMacroFactory.buildParameterDescriptors(DefaultWikiMacroFactory.java:302)
    at org.xwiki.rendering.wikimacro.internal.DefaultWikiMacroFactory.buildMacro(DefaultWikiMacroFactory.java:171)
    at org.xwiki.rendering.wikimacro.internal.DefaultWikiMacroFactory.createWikiMacro(DefaultWikiMacroFactory.java:114)
    at org.xwiki.rendering.internal.macro.wikibridge.WikiMacroEventListener.registerMacro(WikiMacroEventListener.java:124)
    at org.xwiki.rendering.internal.macro.wikibridge.WikiMacroEventListener.onEvent(WikiMacroEventListener.java:105)
    at org.xwiki.observation.internal.DefaultObservationManager.notify(DefaultObservationManager.java:338)
    at org.xwiki.observation.internal.DefaultObservationManager.notify(DefaultObservationManager.java:303)
    at com.xpn.xwiki.XWiki.afterSave(XWiki.java:2036)
    at com.xpn.xwiki.XWiki.saveDocument(XWiki.java:2124)
    at org.xwiki.extension.xar.internal.handler.packager.DocumentMergeImporter.saveDocumentSetContextUser(DocumentMergeImporter.java:208)
    at org.xwiki.extension.xar.internal.handler.packager.DocumentMergeImporter.saveDocument(DocumentMergeImporter.java:154)
    at org.xwiki.extension.xar.internal.handler.packager.DocumentMergeImporter.importDocument(DocumentMergeImporter.java:117)
    at org.xwiki.extension.xar.internal.handler.packager.Packager.importDocumentToWiki(Packager.java:230)
    at org.xwiki.extension.xar.internal.handler.packager.Packager.importXARToWiki(Packager.java:184)
    at org.xwiki.extension.xar.internal.handler.packager.Packager.importXARToWiki(Packager.java:157)
    at org.xwiki.extension.xar.internal.handler.packager.Packager.importXAR(Packager.java:148)
    at org.xwiki.extension.xar.internal.handler.XarExtensionHandler.installInternal(XarExtensionHandler.java:189)
    at org.xwiki.extension.xar.internal.handler.XarExtensionHandler.install(XarExtensionHandler.java:150)
    at org.xwiki.extension.handler.internal.DefaultExtensionHandlerManager.install(DefaultExtensionHandlerManager.java:85)
    at org.xwiki.extension.job.internal.AbstractExtensionJob.installExtension(AbstractExtensionJob.java:330)
    at org.xwiki.extension.job.internal.AbstractExtensionJob.applyAction(AbstractExtensionJob.java:233)
    at org.xwiki.extension.job.internal.AbstractExtensionJob.applyActions(AbstractExtensionJob.java:181)
    at org.xwiki.extension.job.internal.InstallJob.runInternal(InstallJob.java:140)
    at org.xwiki.job.AbstractJob.runInContext(AbstractJob.java:246)
    at org.xwiki.job.AbstractJob.run(AbstractJob.java:223)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.base/java.lang.Thread.run(Unknown Source)
Done installing document [Home » Confluence » Macros » ViewFile]

Similar errors were repeated for several documents. I think this might be caused by https://jira.xwiki.org/browse/XWIKI-18965.

[raphj]

@michitux do you know any workaround? Does a XWiki restart fix the issue?