Gosu Programming Course

What is Gosu Programming?

Gosu is a modern, statically typed, object-oriented programming language, which is widely used in the Guidewire InsuranceSuite suite – for instance, PolicyCenter, BillingCenter, and ClaimCenter. Built to be both easy to use for developers and highly expressive, Gosu blends the versatility of scripting languages with the structure and performance of compiled languages. It is essential for tailoring, setting up, and expanding Guidewire applications.
Key Aspects of the Gosu Language

Statically Typed with Type Inference

Provides the security of type checking at compile-time with the ease of dynamic typing when necessary.

Java Compatibility

Fully interoperable with Java – developers can directly call Java libraries and use Java classes within Gosu code.

Rich Expression Language

Incorporates effective syntax for loops, collections, conditionals, and string manipulation, simplifying and making business rule implementation readable.

XML and Web Services Support

Naturally supports handling XML, SOAP, and REST, making it perfect for creating integrations and handling external data formats.

Template Language Support

Gosu also features Gosu Templates (.gst) for generating documents, emails, and other dynamic outputs.

Integrated with Guidewire Studio

Gosu is developed and maintained within Guidewire Studio, the official IDE for InsuranceSuite development, which offers code completion, debugging tools, and real-time error checking.

Advantages of Gosu for Guidewire Development
Business Rule Flexibility

Easily implement underwriting rules, billing logic, and claims workflows straight in Gosu using configurable rule sets.

Developer Productivity

With clear syntax and helpful tooling, Gosu minimizes boilerplate and enhances code readability and maintainability.

Customization

Allows comprehensive customization of entities, typelists, UI behavior, workflows, plugins, and integration logic.

Reusable and Modular

Promotes modular design and reuse of logic across product models, rule engines, and service layers.

Efficient Performance

Compiled to bytecode and optimized to run efficiently within the Guidewire runtime environment.

Typical Uses for Gosu in Guidewire
Implementing underwriting rules in PolicyCenter
Creating billing plans and delinquency logic in BillingCenter
Writing claim adjudication workflows in ClaimCenter
Building custom plugins for integration and business services
Customizing user interface behavior based on user roles or policy data
Developing scheduled batch processes and asynchronous messaging
Why Learn Gosu?

If you’re developing or maintaining applications on the Guidewire InsuranceSuite platform, Gosu is critical. Its deep integration with the Guidewire architecture makes it the go-to language for setting up business logic, implementing custom behavior, and constructing complete insurance solutions.

Whether you’re a developer just starting with Guidewire or an experienced engineer wanting to improve your Gosu code, understanding this powerful language is key to fully utilizing the InsuranceSuite platform.