I’m trying to use form validation on a dropdownDescriptorSelector, however here the validation method parameters (annotated with @QueryParameter) are not found and set to null (or 0). (If used standalone the validation works).

Is there anything different with a dropdownDescriptorSelector? Or is this caused since the jelly views are in different plugins that use different class loaders?

The relevant main jelly part:

<f:entry description="${description.tool}">
	<f:dropdownDescriptorSelector field="tool" title="${%title.tool}"
		descriptors="${descriptor.availableTools}"/>
</f:entry>

(whole file: ScanForIssuesStep/config.jelly)

The relevant jelly part of the referenced Describable:

<f:entry title="${%High priority threshold}"
        description="${%Minimum number of duplicated lines for high priority warnings.}"
        field="highThreshold">
 <f:textbox default="50"/>
</f:entry>

(whole file: DuplicateCodeScanner/config.jelly)

My validation method:

public FormValidation doCheckHighThreshold(@QueryParameter final int highThreshold,
       @QueryParameter final int normalThreshold) {
   return VALIDATION.validateHigh(highThreshold, normalThreshold);
}

(whole file: DuplicateCodeScanner.java)

Both parameters are always set to zero when setting a breakpoint here.