Issue Summary

This is reproducible on Data Center: yes

Custom Plugins using the atlassian-renderer functionality fails with below Error:-

java.lang.NoClassDefFoundError: org/cyberneko/html/parsers/DOMFragmentParser
at com.atlassian.renderer.wysiwyg.converter.DefaultWysiwygConverter.convertXHtmlToWikiMarkup(DefaultWysiwygConverter.java:346) 

This Error is seen in Jira Software Version starting from 9.10 or Jira Service Management Version starting from 5.10

• Before JIRA 9.10 there were 2 JAR files for nekohtml located in:

/WEB-INF/lib/nekohtml-1.9.19.jar
/WEB-INF/atlassian-bundled-plugins/nekohtml-1.9.12-1.jar

• From JIRA 9.10 there is only single JAR file in below location. It is because nekohtml library was bumped due to a vulnerability

/WEB-INF/atlassian-bundled-plugins/nekohtml-1.9.22-2.jar 

Due to this, Plugins using the atlassian-renderer functionality fails with above NoClassDefFoundError.

Steps to Reproduce

1. Install Jira version 9.12.x
2. Install Scriptrunner plugin
3. Run a script like below from Scriptrunner Console
   Jira Administration>Scriptrunner>Console

   import com.atlassian.renderer.wysiwyg.converter.DefaultWysiwygConverter
   String txtHtml = """ <ul><li>1</li><li>2</li><li>3</li></ul>  """
   return new  DefaultWysiwygConverter().convertXHtmlToWikiMarkup(txtHtml); 

1. Error like below is observed

Expected Results

The script should run fine without the Error.

Actual Results

The below exception is thrown in the atlassian-jira.log file:

java.lang.NoClassDefFoundError: org/cyberneko/html/parsers/DOMFragmentParser at com.atlassian.renderer.wysiwyg.converter.DefaultWysiwygConverter.convertXHtmlToWikiMarkup(DefaultWysiwygConverter.java:346)  

Workaround

As a workaround,

• Copy the nekohtml-1.9.22-2.jar" from location $JIRA_INSTALL/atlassian-jira/WEB-INF/atlassian-bundled-plugins/  to  $JIRA_INSTALL/atlassian-jira/WEB-INF/lib which resolves the issue.

Note- The issue is already fixed in JIRA 10.X version where newer version of atlassian-renderer (9.0.3) is used and above script executes fine. A similar version of atlassian-renderer is required for Jira 9.x version.