Web Panel Breaking Change/Deprecation for Confluence 9.0.0

The way you can add a provider class/script for web panels is different after upgrading to Confluence 9.0. 

We recommend you fix/update the Show a web panel provider class/scripts, as described below. 

Fix/Update the Show a web panel provider class/scripts

The following is an example of an outdated provider class/script: 

groovy
import com.atlassian.plugin.web.model.WebPanel

class MyWebPanel implements WebPanel {
	@Override
	String getHtml(Map<String, Object> context) {
        ""
    }
    
    @Override
    void writeHtml(Writer writer, Map<String, Object> context) throws IOException {
        writer.write("<div>Hello World!</div>")
    }
}

In this script the writeHtml method will be ignored with Confluence 9.0 and the import has been deprecated. You can update these as follows:

• Update the getHtml/writeHtml methods:
  • Problem: The writeHtml method will be ignored, so any content generated using this method alone will not be rendered.
  • Solution: From now on, only use the getHtml method to return the HTML content that you want the panel to render.
• Update the WebPanel interface:
  • Problem: If you're using Atlassian's com.atlassian.plugin.web.api.model.WebPanel interface, this has now been deprecated. Using the deprecated interface will still compile until Atlassian fully removes it in a later release. However, we recommend you update to the new interface now if you were using it in your script to avoid this breaking in the future.
  • Solution: Replace the `com.atlassian.plugin.web.model.WebPanel` Import with `com.atlassian.plugin.web.api.model.WebPanel` instead.

The fixed/updated script would look something like this:

groovy
import com.atlassian.plugin.web.api.model.WebPanel

class MyWebPanel implements WebPanel {
	@Override
	String getHtml(Map<String, Object> context) {
        "<div>Hello World!</div>"
    }
    
    @Override
    void writeHtml(Writer writer, Map<String, Object> context) throws IOException {
        // not used
    }
}