If I have an application which was designed to work the regular way. Now, I take that solution and start making all the classes multitenant using the multi tenant add on. Will I face any issues?
You can connect a multi-tenant add-in to an existing project.
For this you need to replace StandardEntity
on StandardTenantEntity or implement TenantEntity and manually add @TenantId annotation to the column containing the tenant ID.
Setting:
In your database tables, you need to add a TENANT_ID column and tenantId field to the entity.
And also it is necessary to support cases when global access to an object is required.