AbstractClassWithoutAnyMethod
Design
Critical
No abstract method which means that the keyword is most likely used to prevent instantiation. Use a private or protected constructor instead.
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Java rules
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ClassWithOnlyPrivateConstructorsShouldBeFinal
Design
Critical
A class which only has private constructors should be final
ConstructorCallsOverridableMethod
Error prone
Critical
Overridable method 'getAction' called during object construction
DoubleCheckedLocking
Unknown
Critical
Double checked locking is not thread safe in Java.
EmptyMethodInAbstractClassShouldBeAbstract
Code style
Critical
An empty method in an abstract class should be abstract instead
EqualsNull
Error prone
Critical
Avoid using equals() to compare against null
ReturnEmptyArrayRatherThanNull
Error prone
Critical
Return an empty array rather than null.