Missing Parameter Values error with Optional Parameter

I am getting "Missing Parameter Values" error when i try to launch a report from a java program.

This report has some optional parameters, but i don't know how to set that parameter to null.

I try this:

clientDoc.getDataDefController().getParameterFieldController().setCurrentValue(reportName, parameterName , "");:

It's works, but the HasValue() function don't work with empty String.

clientDoc.getDataDefController().getParameterFieldController().setCurrentValue(reportName, parameterName , null);:

The method fails with a NullPointerException

Avoid to call setCurrentValue method when the parameter has no value. Then i getting the "Missing Parameter Values" error

Searching for a solution, i find this (in ..NET SDK)

[Missing Parameter Values CR2008 Optional Parameter;

 

This issue has been resolved in Service Pack 2 for Crystal Reports 2008. There are special notes to be aware of from the release notes.

 

ADAPT01130451

Description:

The error message "missing parameter values error" appears when Crystal reports that use optional parameters are exported using the .NET SDK.

 

New Behavior:

This problem is resolved.

To solve the problem, before exporting the report, users must set the value of optional parameters to true as follows:

 

boReportDocument.ParameterFields["Customer ID"].CurrentValues.IsNoValue = true;

 

Is this bug present in the Java SDK too? How i need to prepare the parameter value when it's options?

Thanks a lot