Error: ID to load are required for loading, reason about model-driven in SSH

First, the reason for this error: When using Hibernate, you can sometimes encounter this exception: Java.lang.IllegalArgumentException:id to load are required for loading, This is because the passed-in ID is null when using a query similar to FindByID (ID)

So what exactly is causing the incoming value to be null?

This is analyzed in this aspect from the model driver in Struts2.

STRUTS2 model drivers When implementing the moderdriven<> () interface, you must ensure that the property name of the foreground interface is consistent with the attribute name of the entity class.

The result is that the null value may be 1, and the model-driven interface is not implemented in the action class;

2. Reception is not consistent with the entity class name.