Indicate your preferences for the Errors/Warnings settings on the Java > Compiler > Errors/Warnings preference page.
Option |
Description |
Default |
---|---|---|
Non-static access to a static member |
When enabled, the compiler will issue an error or a warning whenever a static field or method is accessed with an expression receiver. A reference to a static member should be qualified with a type name. |
Warning |
Indirect access to a static member |
When enabled, the compiler will issue an error or a warning whenever a static field or method is indirectly accessed. A static field of an interface should be qualified with the declaring type name. |
Ignore |
Unqualified access to instance field |
When enabled, the compiler will issue an error or a warning whenever it encounters a field access which is not qualified (eg. misses a 'this'). |
Ignore |
Undocumented empty block |
When enabled, the compiler will issue an error or a warning whenever it encounters an empty block statement with no explaining comment. |
Ignore |
Access to a non-accessible member of an enclosing type |
When enabled, the compiler will issue an error or a warning whenever it emulates access to a non-accessible member of an enclosing type. Such accesses can have performance implications. |
Ignore |
Method with a constructor name |
Naming a method with a constructor name is generally considered poor style programming. When enabling this option, the compiler will signal such scenario either as an error or a warning. |
Warning |
Parameter assignment |
Assigning a value to a parameter is generally considered poor style programming. When enabling this option, the compiler will signal such scenario either as an error or a warning. |
Ignore |
Non-externalized strings |
When enabled, the compiler will issue an error or a warning for non externalized String literal (i.e. non tagged with //$NON-NLS-<n>$) or for non externalized String tags which do not belong to a String. |
Ignore |
Serializable class without serialVersionUID |
When enabled, the compiler will issue an error or a warning whenever a type implementing 'java.io.Serializable' does not contain a serialVersionUID field. |
Warning |
Assignment has no effect (eg. 'x = x') |
When enabled, the compiler will issue an error or a warning whenever an assignment has no effect (eg. 'x = x'). |
Warning |
Possible accidential boolean assigment (eg. 'if (a = b)') |
When enabled, the compiler will issue an error or a warning whenever it encounters a possible accidential boolean assignment (eg. 'if (a = b)'). |
Ignore |
'finally' does not complete normally |
When enabled, the compiler will issue an error or a warning whenever a 'finally' statement does not complete normally (eg. contains a return statement). |
Warning |
Empty statement |
When enabled, the compiler will issue an error or a warning whenever it encounters an empty statement (eg. a superfluos semicolon). |
Ignore |
Using a char array in string concatenation |
When enabled, the compiler will issue an error or a warning whenever a char[] expression is used in String concatenations, "hello" + new char[]{'w','o','r','l','d'} |
Warning |
Hidden catch blocks |
Locally to a try statement, some catch blocks may hide others , eg. try { throw new java.io.CharConversionException(); } catch (java.io.CharConversionException e) { } catch (java.io.IOException e) {}. When enabling this option, the compiler will issue an error or a warning for hidden catch blocks corresponding to checked exceptions. |
Warning |
Inexact type match for vararg arguments |
When enabled, the compiler will issue an error or a warning whenever it encounters an inexact type match for vararg arguments. |
Warning |
Boxing and unboxing conversions |
When enabled, the compiler will issue an error or a warning whenever it encounters a boxing or unboxing conversion. Autoboxing may affects performance negatively. |
Ignore |
Enum type constant not covered on 'switch' |
When enabled, the compiler will issue an error or a warning whenever it encounters a switch statement which does not contain case statements for every enum constant of the referenced enum. |
Ignore |
'switch' case fall-through |
When enabled, the compiler will issue an error or a warning whenever it encounters a switch case without a 'break' statement. Empty switch cases are allowed. |
Ignore |
Null reference |
When enabled, the compiler will issue an error or a warning when it encounters that a local variable which may be null is dereferenced. Note that the analysis is fairly conservative, it only considers cases where there is something suspicious. |
Ignore |
Field declaration hides another field or variable |
When enabling this option, the compiler will issue an error or a warning if a field declaration hides another inherited field. |
Ignore |
Local variable declaration hides another field or variable |
When enabling this option, the compiler will issue an error or a warning if a local variable declaration hides another field or variable. |
Ignore |
Include constructor or setter method parameters |
When enabling this option, the compiler additionally will issue an error or a warning if a constructor or setter method parameter hides another field or variable. |
Off |
Type parameter hides another type |
When enabling this option, the compiler will issue an error or a warning if eg. a type parameter of an inner class hides an outer type. |
Warning |
Methods overridden but not package visible |
A package default method is not visible in a different package, and thus cannot be overridden. When enabling this option, the compiler will signal such scenario either as an error or a warning. |
Warning |
Interface method conflicts with protected 'Object' method |
When enabled, the compiler will issue an error or a warning whenever an interface defines a method incompatible with a non-inherited Object method. Until this conflict is resolved, such an interface cannot be implemented, eg. interface I { int clone(); } |
Warning |
Deprecated API |
When enabled, the compiler will signal use of deprecated API either as an error or a warning. |
Warning |
Signal use of deprecated API inside deprecated code |
When enabled, the compiler will signal use of deprecated API inside deprecated code. The severity of the problem is controlled with option "Deprecated API". |
Off |
Signal overriding or implementing deprecated method |
When enabled, the compiler will signal overriding or implementing a deprecated method The severity of the problem is controlled with option "Deprecated API". |
Off |
Forbidden reference (access rules) |
When enabled, the compiler will signal a forbidden reference specified in the access rules. |
Error |
Discouraged reference (access rules) |
When enabled, the compiler will signal a discouraged reference specified in the access rules. |
Warning |
Local variable is never read |
When enabled, the compiler will issue an error or a warning whenever a local variable is declared but never used within its scope. |
Warning |
Parameter is never read |
When enabled, the compiler will issue an error or a warning whenever a parameter is declared but never used within its scope. |
Ignore |
Check overriding and implementing methods |
When enabled, the compiler additionally will issue an error or a warning whenever a parameter is declared but never used within its scope in overriding or implementing methods. |
Off |
Unused import |
When enabled, the compiler will issue an error or a warning for unused import reference. |
Warning |
Unused local or private members |
When enabled, the compiler will issue an error or a warning whenever a local or private member is declared but never used within the same unit. |
Warning |
Unnecessary else statement |
When enabled, the compiler will issue an error or a warning whenever it encounters an unnecessary else statement (eg. if (condition) return; else doSomething();). |
Ignore |
Unnecessary cast or 'instanceof' operation |
When enabled, the compiler will issue an error or a warning whenever it encounters an unnecessary cast or 'instanceof' operation (eg. if (object instanceof Object) return;). |
Ignore |
Unnecessary declaration of thrown checked exception |
When enabled, the compiler will issue an error or a warning whenever it encounters an unnecessary declaration of a thrown exception. |
Ignore |
Check overriding and implementing methods |
When enabled, the compiler additionally will issue an error or a warning whenever it encounters an unnecessary declaration of a thrown exception in an overriding or implementing method. |
Off |
Unused break/continue label |
When enabled, the compiler will issue an error or a warning whenever it encounters an unused 'break' or 'continue' label. |
Warning |
Unchecked generic type operation |
When enabled, the compiler will issue an error or a warning whenever it encounters an unchecked generic type operation. |
Warning |
Usage of a raw type |
When enabled, the compiler will issue an error or a warning whenever it encounters a usage of a raw type (i.e. List instead of List<String>). |
Ignore |
Generic type parameter declared with a final type bound |
When enabled, the compiler will issue an error or a warning whenever it encounters a type bound involving a final type. |
Warning |
Missing '@Override' annotation |
When enabled, the compiler will issue an error or a warning whenever it encounters a method overriding another implemented method, and the '@Override' annotation is missing. |
Ignore |
Missing '@Deprecated' annotation |
When enabled, the compiler will issue an error or a warning whenever it encounters a deprecated type without additional '@Deprecated' annotation. |
Ignore |
Annotation is used as super interface |
When enabled, the compiler will issue an error or a warning whenever it encounters a type implementing an annotation. Although possible, this is considered bad practice. |
Warning |
Unhandled warning tokens in '@SuppressWarnings' |
When enabled, the compiler will issue an error or a warning whenever it encounters an unhandled warning token in a '@SuppressWarnings' annotation. |
Warning |
Enable '@SuppressWarnings' annotations |
When enabled, the compiler will process '@SuppressWarnings' annotations. |
On |