We all know that the success of any application hinges greatly on the manner of building and integrating the application components. The use of the Spring + Struts + MyBatis (SSM) framework and MongoDB to build web applications can bring a huge amount of advantages with it. This guide will go through the steps required to integrate SSM and MongoDB in order to set up a robust application.

To begin with SSM, the first step is to create the project skeleton. This is a process that often requires a lot of manual configuration. The spring framework provides a command line tool, `Spring Initialzr`, that helps in quickly setting up the project environment. After that, the configuration files and general application structure needs to be setup. This will allow for an easier transition to the Struts and MyBatis frameworks.

Once the application skeleton is set up and the SSM frameworks have been integrated, it’s time to set up MongoDB. Setting up MongoDB involves downloading and installing the specific drivers for Java and setting environment variables. After this, the application can start making use of MongoDB by connecting to it and using its data manipulation functions.

Once the SSM and MongoDB are properly setup, it’s now time to create the final application. This can be done by creating application front end components and integrating the two frameworks together. The spring framework provides a number of tools to facilitate this integration such as `Spring Data Mongo`.

Finally, deploying the application should be done with careful planning. The application should be tested thoroughly with manual, integration, and system/security test processes in all stages of the deployment process. Additionally, performance tuning of the application should also be done in production.

Building a robust application with SSM and MongoDB requires planning and comprehensive testing of the system. Along with the proper integration of the SSM and MongoDB frameworks, this guide provides the steps required for a seamless integration of the two components. With careful attention to detail, the application should be capable of meeting user requirements.