Sybex 816 - Adding service provider

[Vasiliy Spodin]

In "Adding a Service Provider" section last paragraph states: "Java allows only one service provider for a service provider interface in a module. If you wanted to offer another tour, you would need to create a separate module".

Why?

Per JLS (https://docs.oracle.com/javase/specs/jls/se11/html/jls-7.html#jls-7.7):

ModuleDirective:
requires {RequiresModifier} ModuleName ;
exports PackageName [to ModuleName {, ModuleName}] ;
opens PackageName [to ModuleName {, ModuleName}] ;
uses TypeName ;
provides TypeName with TypeName {, TypeName} ;

So provides can contain multiple comma-separated service providers after with.

[Jeanne Boyarsky]

Because I didn't know you could do that . I added it to the errata.

Luckily, you won't have to deal with multiple service providers in the same module on the exam.