I am getting an UnsupportedOperationException when inserting array into Map. The inputs to the map are correct. Is there any proper way I can get insert properly and return the data?
public static Map<String, ProductClassPeriodData[]> getPeriodsByAgreement(String[] productClassIds,String agreementId)
{
Map data = Collections.EMPTY_MAP;
for (int i = 0; i < productClassIds.length; i++)
{
ProductClassPeriodData[] periodData = getInstance().getProductClassPeriodsByAgreement(productClassIds[i], agreementId);
data.put(String.valueOf(i), periodData);
}
return data;
}
Collections.EMPTY_MAP
is immutable, there for this operation is not supported.
/**
* The empty map (immutable). This map is serializable.
*
* @see #emptyMap()
* @since 1.3
*/
@SuppressWarnings("rawtypes")
public static final Map EMPTY_MAP = new EmptyMap<>();
Instead use
Map<String, ProductClassPeriodData[]> data = new HashMap<>();