Hi Sanjay, I did all required changes but application is still throwing the same error. I increased the value to 100000000 (default 100) and even removed the setting of upstream operator's streaming window customization
<property> <name>dt.application.<app_name>.operator.fsRolling.prop.maxWindowsWithNoData </name> <value>100000000</value> </property> I also tried setting the property like <property> <name>dt.application.<app_name>.operator.hiveOutput$fsRolling.prop.maxWindowsWithNoData </name> <value>100000000</value> </property> since 'hiveOutput' is the operator name for HiveModule in my application and 'hiveOutput$fsRolling' is how the name appears when i do list-operators but its of no use Is there any working example of HdfsOutputModule that I can refer to? When I have my ownHdfsSinkOperator which extends AbstractFileOutputOperator the file rollup works perfectly fine but not with HdfsOutputModule or FSPojoToHiveOperator Is there an alternative to achieve the same functionality? please let me know Regards Vivek -- View this message in context: http://apache-apex-users-list.78494.x6.nabble.com/NullPointerException-at-AbstractFSRollingOutputOperator-while-using-HiveOutputModule-tp1625p1633.html Sent from the Apache Apex Users list mailing list archive at Nabble.com.