Affects PMD Version:
5.4.2
Rule:
SingletonClassReturningNewInstance
Description:
The rule incorrectly indicates that the code sample always returns a new instance:
getInstance method always creates a new object and hence does not comply to Singleton Design Pattern behaviour.
Code Sample demonstrating the issue:
public final class Foo {
private static volatile Foo myFoo;
public static Foo getInstance() {
Foo instance = myFoo;
if (instance == null) {
synchronized (Foo .class) {
instance = myFoo;
if (instance == null) {
myFoo= instance = new Foo();
}
}
}
return instance;
}
}
Running PMD through: Gradle (SonarQube)
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