Affects PMD Version: 6.x
Rule: NonThreadSafeSingleton
Description:
The rule reports a violation even for double checked locking, that is implemented correctly.
Code Sample demonstrating the issue:
public class Foo {
private static volatile Object o;
public static Object getO() {
if (o == null) { // violation
synchronized(Foo.class) {
if (o == null) {
o = new Object();
}
}
}
return o;
}
}
Expected outcome: No violation
Note: This has already been fixed for PMD 7.0.0-rc1 via #3474. This issue is just there for documentation.
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