REPORT_PARAMETERS_MAP.get() Returns NULL for Ad Hoc View Pre-defined Locked Filter

Issue Description

User created an Ad Hoc Report based on Ad Hoc View with Locked Pre-filter.

In order to display the pre-filter value in the report, he added a TextField with expression like

$P{REPORT_PARAMETERS_MAP}.get("shipcountry_1")[/code]

where shipcountry is a filed used in the pre-filter.

But the expression always returns NULL instead of value specified in the pre-filter.

Explanation

In case of creating Locked Pre-Filter, as end-user can't modify the filter value, JasperReports engine does not create a parameter for the filter.

If you check Ad Hoc View's state.xml file, the filter defined with static value, like

<subFilter id="filter_1" letter="A" objectType="String" sourceString="DATA_CHOOSER_NO_PROMPT"><expressionString>shipcountry in ('USA')</expressionString><parameterizedExpressionString>shipcountry in ('USA')</parameterizedExpressionString></subFilter>[/code]

while in case of using non-locked per-filter, a parameter is created and used in the expression like

<subFilter id="filter_1" letter="A" objectType="String" sourceString="DATA_CHOOSER_NO_PROMPT"><expressionString>shipcountry in ('USA')</expressionString><parameterizedExpressionString>shipcountry in shipcountry_1</parameterizedExpressionString></subFilter>[/code]

That's why expression like

$P{REPORT_PARAMETERS_MAP}.get("shipcountry_1")[/code]

returns NULL.

A possible workaround is to create a non-locked Pre-Filter in Ad Hoc View and then make associated Input Control invisible to not allow end-users modifying the value.

Solution tested with TIBCO JasperReports^® Server v.7.2.0

AS-20191023, case #01808330