Allow errors as event stream output members

[davidh44]

Motivation and Context

Smithy spec states:

Event streams MAY target shapes marked with the error trait

https://smithy.io/2.0/spec/streaming.html#modeled-errors-in-event-streams

Codegen currently throws a NPE if a exception shape is a member of an event stream output. This is because the Java SDK codegen stores exception shape names by appending a suffix Exception.

• https://github.com/aws/aws-sdk-java-v2/blob/master/codegen/src/main/java/software/amazon/awssdk/codegen/naming/DefaultNamingStrategy.java#L252

Modifications

Update RemoveUnusedShapes.resolveMemberShapes(), so that if the shape type is Exception, and the MemberModel C2J shape name equals the ShapeModel C2J name, to resolve the shape name (original name) instead of returning the simple type (with Exception suffix)

Testing

Added exception shape to event stream output in codegen test model

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud