NullPointerException appears in PersistentPropertyPathExtension#equals

[olexandrkucher]

NullPointerException appears in PersistentPropertyPathExtension#equals, because field PersistentPropertyPathExtension#path is nullable and equals ignores that path can be null:

public boolean equals(Object o) {
    //...
    return entity.equals(that.entity) && path.equals(that.path);
}

[schauder]

Do you have an actual scenario where this happens?

[olexandrkucher]

We have a custom DataAccessStrategy that speeds up the read operation for a list of data. As one of the steps, we are grouping all PersistentPropertyPathExtension by the parent path.
This logic worked properly in spring-data-relational v2.0.1.RELEASE and failed after upgrade to the latest version