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Lambda-unfriendly method overload

Reports overloaded methods that take functional interfaces with conflicting abstract method signatures.

Such overloads introduce ambiguity and require callers to cast lambdas to a specific type or specify lambda parameter types explicitly. It is preferable to give the overloaded methods different names to eliminate ambiguity.


interface MyExecutor { void execute(Supplier<?> supplier); void execute(Callable<?> callable); }

Here, Supplier and Callable are functional interfaces whose single abstract methods do not take any parameters and return a non-void value. As a result, the type of the lambda cannot be inferred at the call site unless an explicit cast is used.

Locating this inspection


Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Java | Naming conventions | Method


By default bundled with

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin

Java, 241.18072

Last modified: 18 June 2024