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Java Compiler Errors/Warnings Preferences
Code style
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Option
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Description
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Default
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Non-static access to a static member
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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.
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Warning
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Indirect access to a static member
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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.
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Ignore
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Unqualified access to instance field
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When enabled, the compiler will issue an error or a warning whenever it encounters a field access which is not qualified (e.g. misses a 'this').
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Ignore
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Undocumented empty block
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When enabled, the compiler will issue an error or a warning whenever it encounters an empty block statement with no explaining comment.
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Ignore
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Access to a non-accessible member of an enclosing type
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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.
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Ignore
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Method with a constructor name
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Naming a method with a constructor name is generally considered poor style programming. When this option is enabled, the compiler will signal such scenario either as an error or a warning.
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Warning
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Parameter assignment
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Assigning a value to a parameter is generally considered poor style programming. When this option is enabled, the compiler will signal such scenario either as an error or a warning.
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Ignore
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Non-externalized strings
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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.
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Ignore
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Potential programming problems
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Serializable class without serialVersionUID
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When enabled, the compiler will issue an error or a warning whenever a type implementing 'java.io.Serializable' does not contain a serialVersionUID field.
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Warning
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Assignment has no effect (e.g. 'x = x')
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When enabled, the compiler will issue an error or a warning whenever an assignment has no effect (e.g. 'x = x').
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Warning
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Possible accidental boolean assignment (e.g. 'if (a = b)')
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When enabled, the compiler will issue an error or a warning whenever it encounters a possible accidental boolean assignment (e.g. 'if (a = b)').
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Ignore
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'finally' does not complete normally
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When enabled, the compiler will issue an error or a warning whenever a 'finally' statement does not complete normally (e.g. contains a return statement).
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Warning
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Empty statement
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When enabled, the compiler will issue an error or a warning whenever it encounters an empty statement (e.g. a superfluous semicolon).
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Ignore
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Using a char array in string concatenation
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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'}
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Warning
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Hidden catch blocks
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Locally to a try statement, some catch blocks may hide others , e.g.
try { throw new java.io.CharConversionException();
} catch (java.io.CharConversionException e) {
} catch (java.io.IOException e) {}.
When enabled, the compiler will issue an error or a warning for hidden catch blocks corresponding to checked exceptions.
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Warning
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Inexact type match for vararg arguments
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When enabled, the compiler will issue an error or a warning whenever it encounters an inexact type match for vararg arguments.
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Warning
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Boxing and unboxing conversions
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When enabled, the compiler will issue an error or a warning whenever it encounters a boxing or unboxing conversion. Autoboxing may affects performance negatively.
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Ignore
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Enum type constant not covered on 'switch'
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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.
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Ignore
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'switch' case fall-through
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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.
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Ignore
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Null pointer access
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When enabled, the compiler will issue an error or a warning when it encounters that a local variable which is certainly null is dereferenced. Note that the analysis can not find all null pointer accesses, see Potential null pointer access.
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Warning
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Potential null pointer access
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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.
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Ignore
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Comparing identical
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When enabled, the compiler will issue an error or a warning if a comparisonis involving identical operands (e.g 'x == x')..
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Warning
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Name shadowing and conflicts
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Field declaration hides another field or variable
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When enabled, the compiler will issue an error or a warning if a field declaration hides another inherited field.
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Ignore
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Local variable declaration hides another field or variable
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When enabled, the compiler will issue an error or a warning if a local variable declaration hides another field or variable.
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Ignore
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Include constructor or setter method parameters
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When enabled, the compiler additionally will issue an error or a warning if a constructor or setter method parameter hides another field or variable.
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Off
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Type parameter hides another type
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When enabled, the compiler will issue an error or a warning if i.e. a type parameter of an inner class hides an outer type.
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Warning
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Method does not override package visible method
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A package default method is not visible in a different package, and thus cannot be overridden. When this option is enabled, the compiler will signal such scenario either as an error or a warning.
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Warning
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Interface method conflicts with protected 'Object' method
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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, e.g.
interface I {
int clone();
}
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Warning
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Deprecated and restricted API
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Deprecated API
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When enabled, the compiler will signal use of deprecated API either as an error or a warning.
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Warning
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Signal use of deprecated API inside deprecated code
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When enabled, the compiler will signal use of deprecated API inside deprecated code. The severity of the problem is controlled with option "Deprecated API".
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Off
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Signal overriding or implementing deprecated method
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When enabled, the compiler will signal overriding or implementing a deprecated method The severity of the problem is controlled with option "Deprecated API".
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Off
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Forbidden reference (access rules)
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When enabled, the compiler will signal a forbidden reference specified in the access rules.
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Error
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Discouraged reference (access rules)
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When enabled, the compiler will signal a discouraged reference specified in the access rules.
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Warning
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Unnecessary code
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Local variable is never read
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When enabled, the compiler will issue an error or a warning whenever a local variable is declared but never used within its scope.
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Warning
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Parameter is never read
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When enabled, the compiler will issue an error or a warning whenever a parameter is declared but never used within its scope.
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Ignore
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Ignore in overriding and implementing methods
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When enabled, the compiler will not issue an error or a warning whenever a parameter is declared but never used within its scope in a method that overrides or implements another method.
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On
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Ignore parameters documented with '@param' tag
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When enabled, the compiler will not issue an error or a warning whenever an unread parameter is documented with an '@param' tag.
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On
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Unused import
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When enabled, the compiler will issue an error or a warning for unused import reference.
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Warning
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Unused local or private members
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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.
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Warning
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Redundant null check
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When enabled, the compiler will issue an error or a warning whenever a local variable which can not be null is tested for null.
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Ignore
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Unnecessary 'else' statement
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When enabled, the compiler will issue an error or a warning whenever it encounters an unnecessary else statement (e.g. if (condition) return; else doSomething();).
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Ignore
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Unnecessary cast or 'instanceof' operation
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When enabled, the compiler will issue an error or a warning whenever it encounters an unnecessary cast or 'instanceof' operation (e.g. if (object instanceof Object) return;).
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Ignore
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Unnecessary declaration of thrown exception
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When enabled, the compiler will issue an error or a warning whenever it encounters an unnecessary declaration of a thrown exception.
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Ignore
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Ignore in overriding and implementing methods
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When enabled, the compiler will not issue an error or a warning whenever it encounters an unnecessary declaration of a thrown exception in a method that overrides or implements another method.
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On
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Ignore exceptions documented with '@throws' or '@exception' tags
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When enabled, the compiler will not issue an error or a warning whenever an an unnecessary declaration of a thrown exception is documented with an '@throws' or '@exception' tag.
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On
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Ignore 'Exception' and 'Throwable'
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When enabled, the compiler will not issue an error or a warning whenever it encounters an unnecessary declaration of 'Exception' and 'Throwable' exception
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On
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Unused 'break' or 'continue' label
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When enabled, the compiler will issue an error or a warning whenever it encounters an unused 'break' or 'continue' label.
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Warning
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Redundant super interface
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When enabled, the compiler will issue an error or a warning whenever it encounters a type which
explicitly implements an interface that is already implemented by any of its supertypes.
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Ignore
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Generic types
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Unchecked generic type operation
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When enabled, the compiler will issue an error or a warning whenever it encounters an unchecked generic type operation.
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Warning
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Usage of a raw type
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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>).
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Warning
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Generic type parameter declared with a final type bound
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When enabled, the compiler will issue an error or a warning whenever it encounters a type bound involving a final type.
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Warning
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Annotations
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Missing '@Override' annotation
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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.
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Ignore
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Missing '@Deprecated' annotation
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When enabled, the compiler will issue an error or a warning whenever it encounters a deprecated type without additional '@Deprecated' annotation.
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Ignore
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Annotation is used as super interface
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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.
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Warning
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Unhandled token in '@SuppressWarnings'
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When enabled, the compiler will issue an error or a warning whenever it encounters an unhandled token in a '@SuppressWarnings' annotation.
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Warning
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Unused '@SuppressWarnings' token
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When enabled, the compiler will issue an error or a warning whenever it encounters an unused token in a '@SuppressWarnings' annotation.
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Warning
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Enable '@SuppressWarnings' annotations
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When enabled, the compiler will process '@SuppressWarnings' annotations.
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On
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When Treat errors like fatal compile errors is enabled, all generated errors, fatal or configurable, lead to non-executable code.
If disabled, then your code can be executed as long as it has no fatal error (i.e. syntax error).
Problems View
Quick Fix
Java builder
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