Attempting to execute an Explore/Correlate from IM generates the following error:
java.lang.NumberFormatException: For input string: ""
IM environments upgraded to 14.x from 12.x
A new property "is_filter_enc" was added to the Explore definition which may not have an initial value set if the Explore definition was created in the older product version. The blank value for this new property then causes the java.lang.NumberFormatException error.
Export the IME Role XML and review the ManagedObject type="EXPLORE AND CORRELATE" and if there are any with the Attribute name="is_filter_enc" with a blank value then edit those to set a value of 0. Save the XML and import the updated XML back into the IME.