Exception in thread "main" java.lang.IllegalStateException: No operators defined in streaming topology. Cannot execute.

This error occurs when a Storm topology is defined but no operators (spouts or bolts) are defined in it. In order for Storm to execute a topology, it must contain at least one spout or bolt.

To fix this error, you need to define at least one spout or bolt in your topology. This can be done by creating a new class that extends either the BaseRichSpout or BaseRichBolt classes and implementing the appropriate methods, such as nextTuple() for spouts or execute() for bolts.

Once you have defined your spouts and bolts, you can add them to your topology using the methods provided by the Storm API, such as setSpout() or setBolt().

Make sure to also specify the connections between your spouts and bolts using the declareOutputFields() and declareInputFields() methods.

Once you have defined your topology with at least one spout or bolt, you should be able to execute it without encountering this error.