DuplicatedBeanException class

Exception thrown when trying to register a bean that already exists in the DDI container.

This exception is thrown in the following scenarios:

• When calling ddi.registerSingleton<Type>() for a type that's already registered
• When calling ddi.registerApplication<Type>() for a type that's already registered
• When calling ddi.registerDependent<Type>() for a type that's already registered
• When registering with the same qualifier that's already in use
• When trying to register a factory for a type that already has a factory

Common causes:

• Registering the same service multiple times in different parts of the code
• Using the same qualifier for different services
• Registering services in multiple modules without proper coordination
• Forgetting to check if a service is already registered before registering it

To resolve this issue:

• Use ddi.isRegistered<Type>() to check if a bean exists before registering it
• Use different qualifiers for different instances of the same type
• Ensure that registration happens only once per application lifecycle
• Use conditional registration with canRegister parameter

Example:

// This will throw DuplicatedBeanException
ddi.registerSingleton<MyService>(MyService.new);
ddi.registerSingleton<MyService>(MyService.new); // Duplicate!

// Use conditional registration to avoid duplicates
if (!ddi.isRegistered<MyService>()) {
  ddi.registerSingleton<MyService>(MyService.new);
}

// Or use different qualifiers
ddi.registerSingleton<MyService>(MyService.new, qualifier: 'service1');
ddi.registerSingleton<MyService>(MyService.new, qualifier: 'service2');

Implemented types

• Exception

Constructors

DuplicatedBeanException(String type)

const

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

type → String

final

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited