FindBugs Bug Descriptions

2023-10-29

FindBugs Bug Descriptions

This document lists the standard bug patterns reported byFindBugs version 1.3.9.

Summary

Description Category
AM: Creates an empty jar file entry Bad practice
AM: Creates an empty zip file entry Bad practice
BC: Equals method should not assume anything about the type of its argument Bad practice
BC: Random object created and used only once Bad practice
BIT: Check for sign of bitwise operation Bad practice
CN: Class implements Cloneable but does not define or use clone method Bad practice
CN: clone method does not call super.clone() Bad practice
CN: Class defines clone() but doesn't implement Cloneable Bad practice
Co: Abstract class defines covariant compareTo() method Bad practice
Co: Covariant compareTo() method defined Bad practice
DE: Method might drop exception Bad practice
DE: Method might ignore exception Bad practice
DMI: Don't use removeAll to clear a collection Bad practice
DP: Classloaders should only be created inside doPrivileged block Bad practice
DP: Method invoked that should be only be invoked inside a doPrivileged block Bad practice
Dm: Method invokes System.exit(...) Bad practice
Dm: Method invokes dangerous method runFinalizersOnExit Bad practice
ES: Comparison of String parameter using == or != Bad practice
ES: Comparison of String objects using == or != Bad practice
Eq: Abstract class defines covariant equals() method Bad practice
Eq: Equals checks for noncompatible operand Bad practice
Eq: Class defines compareTo(...) and uses Object.equals() Bad practice
Eq: equals method fails for subtypes Bad practice
Eq: Covariant equals() method defined Bad practice
FI: Empty finalizer should be deleted Bad practice
FI: Explicit invocation of finalizer Bad practice
FI: Finalizer nulls fields Bad practice
FI: Finalizer only nulls fields Bad practice
FI: Finalizer does not call superclass finalizer Bad practice
FI: Finalizer nullifies superclass finalizer Bad practice
FI: Finalizer does nothing but call superclass finalizer Bad practice
GC: Unchecked type in generic call Bad practice
HE: Class defines equals() but not hashCode() Bad practice
HE: Class defines equals() and uses Object.hashCode() Bad practice
HE: Class defines hashCode() but not equals() Bad practice
HE: Class defines hashCode() and uses Object.equals() Bad practice
HE: Class inherits equals() and uses Object.hashCode() Bad practice
IC: Superclass uses subclass during initialization Bad practice
IMSE: Dubious catching of IllegalMonitorStateException Bad practice
ISC: Needless instantiation of class that only supplies static methods Bad practice
It: Iterator next() method can't throw NoSuchElementException Bad practice
J2EE: Store of non serializable object into HttpSession Bad practice
JCIP: Fields of immutable classes should be final Bad practice
NP: Method with Boolean return type returns explicit null Bad practice
NP: Clone method may return null Bad practice
NP: equals() method does not check for null argument Bad practice
NP: toString method may return null Bad practice
Nm: Class names should start with an upper case letter Bad practice
Nm: Class is not derived from an Exception, even though it is named as such Bad practice
Nm: Confusing method names Bad practice
Nm: Field names should start with a lower case letter Bad practice
Nm: Use of identifier that is a keyword in later versions of Java Bad practice
Nm: Use of identifier that is a keyword in later versions of Java Bad practice
Nm: Method names should start with a lower case letter Bad practice
Nm: Class names shouldn't shadow simple name of implemented interface Bad practice
Nm: Class names shouldn't shadow simple name of superclass Bad practice
Nm: Very confusing method names (but perhaps intentional) Bad practice
Nm: Method doesn't override method in superclass due to wrong package for parameter Bad practice
ODR: Method may fail to close database resource Bad practice
ODR: Method may fail to close database resource on exception Bad practice
OS: Method may fail to close stream Bad practice
OS: Method may fail to close stream on exception Bad practice
RC: Suspicious reference comparison to constant Bad practice
RC: Suspicious reference comparison of Boolean values Bad practice
RR: Method ignores results of InputStream.read() Bad practice
RR: Method ignores results of InputStream.skip() Bad practice
RV: Method ignores exceptional return value Bad practice
SI: Static initializer creates instance before all static final fields assigned Bad practice
SW: Certain swing methods needs to be invoked in Swing thread Bad practice
Se: Non-transient non-serializable instance field in serializable class Bad practice
Se: Non-serializable class has a serializable inner class Bad practice
Se: Non-serializable value stored into instance field of a serializable class Bad practice
Se: Comparator doesn't implement Serializable Bad practice
Se: Serializable inner class Bad practice
Se: serialVersionUID isn't final Bad practice
Se: serialVersionUID isn't long Bad practice
Se: serialVersionUID isn't static Bad practice
Se: Class is Serializable but its superclass doesn't define a void constructor Bad practice
Se: Class is Externalizable but doesn't define a void constructor Bad practice
Se: The readResolve method must be declared with a return type of Object. Bad practice
Se: Transient field that isn't set by deserialization. Bad practice
SnVI: Class is Serializable, but doesn't define serialVersionUID Bad practice
UI: Usage of GetResource may be unsafe if class is extended Bad practice
BC: Impossible cast Correctness
BC: Impossible downcast Correctness
BC: Impossible downcast of toArray() result Correctness
BC: instanceof will always return false Correctness
BIT: Bitwise add of signed byte value Correctness
BIT: Incompatible bit masks Correctness
BIT: Check to see if ((...) & 0) == 0 Correctness
BIT: Incompatible bit masks Correctness
BIT: Bitwise OR of signed byte value Correctness
BIT: Check for sign of bitwise operation Correctness
BOA: Class overrides a method implemented in super class Adapter wrongly Correctness
BSHIFT: 32 bit int shifted by an amount not in the range 0..31 Correctness
Bx: Primitive value is unboxed and coerced for ternary operator Correctness
DLS: Dead store of class literal Correctness
DLS: Overwritten increment Correctness
DMI: Bad constant value for month Correctness
DMI: hasNext method invokes next Correctness
DMI: Collections should not contain themselves Correctness
DMI: Invocation of hashCode on an array Correctness
DMI: Double.longBitsToDouble invoked on an int Correctness
DMI: Vacuous call to collections Correctness
Dm: Can't use reflection to check for presence of annotation without runtime retention Correctness
Dm: Futile attempt to change max pool size of ScheduledThreadPoolExecutor Correctness
Dm: Creation of ScheduledThreadPoolExecutor with zero core threads Correctness
Dm: Useless/vacuous call to EasyMock method Correctness
EC: equals() used to compare array and nonarray Correctness
EC: Invocation of equals() on an array, which is equivalent to == Correctness
EC: equals(...) used to compare incompatible arrays Correctness
EC: Call to equals() with null argument Correctness
EC: Call to equals() comparing unrelated class and interface Correctness
EC: Call to equals() comparing different interface types Correctness
EC: Call to equals() comparing different types Correctness
EC: Using pointer equality to compare different types Correctness
Eq: equals method always returns false Correctness
Eq: equals method always returns true Correctness
Eq: equals method compares class names rather than class objects Correctness
Eq: Covariant equals() method defined for enum Correctness
Eq: equals() method defined that doesn't override equals(Object) Correctness
Eq: equals() method defined that doesn't override Object.equals(Object) Correctness
Eq: equals method overrides equals in superclass and may not be symmetric Correctness
Eq: Covariant equals() method defined, Object.equals(Object) inherited Correctness
FE: Doomed test for equality to NaN Correctness
FS: Format string placeholder incompatible with passed argument Correctness
FS: The type of a supplied argument doesn't match format specifier Correctness
FS: MessageFormat supplied where printf style format expected Correctness
FS: More arguments are passed than are actually used in the format string Correctness
FS: Illegal format string Correctness
FS: Format string references missing argument Correctness
FS: No previous argument for format string Correctness
GC: No relationship between generic parameter and method argument Correctness
HE: Signature declares use of unhashable class in hashed construct Correctness
HE: Use of class without a hashCode() method in a hashed data structure Correctness
ICAST: integral value cast to double and then passed to Math.ceil Correctness
ICAST: int value cast to float and then passed to Math.round Correctness
IJU: JUnit assertion in run method will not be noticed by JUnit Correctness
IJU: TestCase declares a bad suite method Correctness
IJU: TestCase has no tests Correctness
IJU: TestCase defines setUp that doesn't call super.setUp() Correctness
IJU: TestCase implements a non-static suite method Correctness
IJU: TestCase defines tearDown that doesn't call super.tearDown() Correctness
IL: A collection is added to itself Correctness
IL: An apparent infinite loop Correctness
IL: An apparent infinite recursive loop Correctness
IM: Integer multiply of result of integer remainder Correctness
INT: Bad comparison of nonnegative value with negative constant Correctness
INT: Bad comparison of signed byte Correctness
IO: Doomed attempt to append to an object output stream Correctness
IP: A parameter is dead upon entry to a method but overwritten Correctness
MF: Class defines field that masks a superclass field Correctness
MF: Method defines a variable that obscures a field Correctness
NP: Null pointer dereference Correctness
NP: Null pointer dereference in method on exception path Correctness
NP: Method does not check for null argument Correctness
NP: close() invoked on a value that is always null Correctness
NP: Null value is guaranteed to be dereferenced Correctness
NP: Value is null and guaranteed to be dereferenced on exception path Correctness
NP: Method call passes null to a nonnull parameter Correctness
NP: Method may return null, but is declared @NonNull Correctness
NP: A known null value is checked to see if it is an instance of a type Correctness
NP: Possible null pointer dereference Correctness
NP: Possible null pointer dereference in method on exception path Correctness
NP: Method call passes null for nonnull parameter Correctness
NP: Method call passes null for nonnull parameter Correctness
NP: Non-virtual method call passes null for nonnull parameter Correctness
NP: Store of null value into field annotated NonNull Correctness
NP: Read of unwritten field Correctness
Nm: Class defines equal(Object); should it be equals(Object)? Correctness
Nm: Class defines hashcode(); should it be hashCode()? Correctness
Nm: Class defines tostring(); should it be toString()? Correctness
Nm: Apparent method/constructor confusion Correctness
Nm: Very confusing method names Correctness
Nm: Method doesn't override method in superclass due to wrong package for parameter Correctness
QBA: Method assigns boolean literal in boolean expression Correctness
RC: Suspicious reference comparison Correctness
RCN: Nullcheck of value previously dereferenced Correctness
RE: Invalid syntax for regular expression Correctness
RE: File.separator used for regular expression Correctness
RE: "." used for regular expression Correctness
RV: Random value from 0 to 1 is coerced to the integer 0 Correctness
RV: Bad attempt to compute absolute value of signed 32-bit hashcode Correctness
RV: Bad attempt to compute absolute value of signed 32-bit random integer Correctness
RV: Exception created and dropped rather than thrown Correctness
RV: Method ignores return value Correctness
RpC: Repeated conditional tests Correctness
SA: Double assignment of field Correctness
SA: Self assignment of field Correctness
SA: Self comparison of field with itself Correctness
SA: Nonsensical self computation involving a field (e.g., x & x) Correctness
SA: Self comparison of value with itself Correctness
SA: Nonsensical self computation involving a variable (e.g., x & x) Correctness
SF: Dead store due to switch statement fall through Correctness
SF: Dead store due to switch statement fall through to throw Correctness
SIC: Deadly embrace of non-static inner class and thread local Correctness
SIO: Unnecessary type check done using instanceof operator Correctness
SQL: Method attempts to access a prepared statement parameter with index 0 Correctness
SQL: Method attempts to access a result set field with index 0 Correctness
STI: Unneeded use of currentThread() call, to call interrupted() Correctness
STI: Static Thread.interrupted() method invoked on thread instance Correctness
Se: Method must be private in order for serialization to work Correctness
Se: The readResolve method must not be declared as a static method. Correctness
TQ: Value annotated as carrying a type qualifier used where a value that must not carry that qualifier is required Correctness
TQ: Value that might not carry a type qualifier is always used in a way requires that type qualifier Correctness
TQ: Value that might carry a type qualifier is always used in a way prohibits it from having that type qualifier Correctness
TQ: Value annotated as never carrying a type qualifier used where value carrying that qualifier is required Correctness
UMAC: Uncallable method defined in anonymous class Correctness
UR: Uninitialized read of field in constructor Correctness
UR: Uninitialized read of field method called from constructor of superclass Correctness
USELESS_STRING: Invocation of toString on an array Correctness
USELESS_STRING: Invocation of toString on an array Correctness
USELESS_STRING: Array formatted in useless way using format string Correctness
UwF: Field only ever set to null Correctness
UwF: Unwritten field Correctness
VA: Primitive array passed to function expecting a variable number of object arguments Correctness
LG: Potential lost logger changes due to weak reference in OpenJDK Experimental
OBL: Method may fail to clean up stream or resource Experimental
Dm: Consider using Locale parameterized version of invoked method Internationalization
EI: May expose internal representation by returning reference to mutable object Malicious code vulnerability
EI2: May expose internal representation by incorporating reference to mutable object Malicious code vulnerability
FI: Finalizer should be protected, not public Malicious code vulnerability
MS: May expose internal static state by storing a mutable object into a static field Malicious code vulnerability
MS: Field isn't final and can't be protected from malicious code Malicious code vulnerability
MS: Public static method may expose internal representation by returning array Malicious code vulnerability
MS: Field should be both final and package protected Malicious code vulnerability
MS: Field is a mutable array Malicious code vulnerability
MS: Field is a mutable Hashtable Malicious code vulnerability
MS: Field should be moved out of an interface and made package protected Malicious code vulnerability
MS: Field should be package protected Malicious code vulnerability
MS: Field isn't final but should be Malicious code vulnerability
DC: Possible double check of field Multithreaded correctness
DL: Synchronization on Boolean could lead to deadlock Multithreaded correctness
DL: Synchronization on boxed primitive could lead to deadlock Multithreaded correctness
DL: Synchronization on interned String could lead to deadlock Multithreaded correctness
DL: Synchronization on boxed primitive values Multithreaded correctness
Dm: Monitor wait() called on Condition Multithreaded correctness
Dm: A thread was created using the default empty run method Multithreaded correctness
ESync: Empty synchronized block Multithreaded correctness
IS: Inconsistent synchronization Multithreaded correctness
IS: Field not guarded against concurrent access Multithreaded correctness
JLM: Synchronization performed on Lock Multithreaded correctness
LI: Incorrect lazy initialization of static field Multithreaded correctness
LI: Incorrect lazy initialization and update of static field Multithreaded correctness
ML: Synchronization on field in futile attempt to guard that field Multithreaded correctness
ML: Method synchronizes on an updated field Multithreaded correctness
MSF: Mutable servlet field Multithreaded correctness
MWN: Mismatched notify() Multithreaded correctness
MWN: Mismatched wait() Multithreaded correctness
NN: Naked notify Multithreaded correctness
NP: Synchronize and null check on the same field. Multithreaded correctness
No: Using notify() rather than notifyAll() Multithreaded correctness
RS: Class's readObject() method is synchronized Multithreaded correctness
RV: Return value of putIfAbsent ignored, value passed to putIfAbsent reused Multithreaded correctness
Ru: Invokes run on a thread (did you mean to start it instead?) Multithreaded correctness
SC: Constructor invokes Thread.start() Multithreaded correctness
SP: Method spins on field Multithreaded correctness
STCAL: Call to static Calendar Multithreaded correctness
STCAL: Call to static DateFormat Multithreaded correctness
STCAL: Static Calendar Multithreaded correctness
STCAL: Static DateFormat Multithreaded correctness
SWL: Method calls Thread.sleep() with a lock held Multithreaded correctness
TLW: Wait with two locks held Multithreaded correctness
UG: Unsynchronized get method, synchronized set method Multithreaded correctness
UL: Method does not release lock on all paths Multithreaded correctness
UL: Method does not release lock on all exception paths Multithreaded correctness
UW: Unconditional wait Multithreaded correctness
VO: A volatile reference to an array doesn't treat the array elements as volatile Multithreaded correctness
WL: Sychronization on getClass rather than class literal Multithreaded correctness
WS: Class's writeObject() method is synchronized but nothing else is Multithreaded correctness
Wa: Condition.await() not in loop Multithreaded correctness
Wa: Wait not in loop Multithreaded correctness
Bx: Primitive value is boxed and then immediately unboxed Performance
Bx: Primitive value is boxed then unboxed to perform primitive coercion Performance
Bx: Method allocates a boxed primitive just to call toString Performance
Bx: Method invokes inefficient floating-point Number constructor; use static valueOf instead Performance
Bx: Method invokes inefficient Number constructor; use static valueOf instead Performance
Dm: The equals and hashCode methods of URL are blocking Performance
Dm: Maps and sets of URLs can be performance hogs Performance
Dm: Method invokes inefficient Boolean constructor; use Boolean.valueOf(...) instead Performance
Dm: Explicit garbage collection; extremely dubious except in benchmarking code Performance
Dm: Method allocates an object, only to get the class object Performance
Dm: Use the nextInt method of Random rather than nextDouble to generate a random integer Performance
Dm: Method invokes inefficient new String(String) constructor Performance
Dm: Method invokes toString() method on a String Performance
Dm: Method invokes inefficient new String() constructor Performance
HSC: Huge string constants is duplicated across multiple class files Performance
ITA: Method uses toArray() with zero-length array argument Performance
SBSC: Method concatenates strings using + in a loop Performance
SIC: Should be a static inner class Performance
SIC: Could be refactored into a named static inner class Performance
SIC: Could be refactored into a static inner class Performance
SS: Unread field: should this field be static? Performance
UM: Method calls static Math class method on a constant value Performance
UPM: Private method is never called Performance
UrF: Unread field Performance
UuF: Unused field Performance
WMI: Inefficient use of keySet iterator instead of entrySet iterator Performance
Dm: Hardcoded constant database password Security
Dm: Empty database password Security
HRS: HTTP cookie formed from untrusted input Security
HRS: HTTP Response splitting vulnerability Security
SQL: Nonconstant string passed to execute method on an SQL statement Security
SQL: A prepared statement is generated from a nonconstant String Security
XSS: JSP reflected cross site scripting vulnerability Security
XSS: Servlet reflected cross site scripting vulnerability Security
XSS: Servlet reflected cross site scripting vulnerability Security
BC: Questionable cast to abstract collection Dodgy
BC: Questionable cast to concrete collection Dodgy
BC: Unchecked/unconfirmed cast Dodgy
BC: instanceof will always return true Dodgy
BSHIFT: Unsigned right shift cast to short/byte Dodgy
CI: Class is final but declares protected field Dodgy
DB: Method uses the same code for two branches Dodgy
DB: Method uses the same code for two switch clauses Dodgy
DLS: Dead store to local variable Dodgy
DLS: Useless assignment in return statement Dodgy
DLS: Dead store of null to local variable Dodgy
DMI: Code contains a hard coded reference to an absolute pathname Dodgy
DMI: Non serializable object written to ObjectOutput Dodgy
DMI: Invocation of substring(0), which returns the original value Dodgy
Dm: Thread passed where Runnable expected Dodgy
Eq: Class doesn't override equals in superclass Dodgy
Eq: Unusual equals method Dodgy
FE: Test for floating point equality Dodgy
FS: Non-Boolean argument formatted using %b format specifier Dodgy
IA: Ambiguous invocation of either an inherited or outer method Dodgy
IC: Initialization circularity Dodgy
ICAST: integral division result cast to double or float Dodgy
ICAST: Result of integer multiplication cast to long Dodgy
IM: Computation of average could overflow Dodgy
IM: Check for oddness that won't work for negative numbers Dodgy
INT: Integer remainder modulo 1 Dodgy
INT: Vacuous comparison of integer value Dodgy
MTIA: Class extends Servlet class and uses instance variables Dodgy
MTIA: Class extends Struts Action class and uses instance variables Dodgy
NP: Dereference of the result of readLine() without nullcheck Dodgy
NP: Immediate dereference of the result of readLine() Dodgy
NP: Load of known null value Dodgy
NP: Possible null pointer dereference due to return value of called method Dodgy
NP: Possible null pointer dereference on path that might be infeasible Dodgy
NP: Parameter must be nonnull but is marked as nullable Dodgy
NS: Potentially dangerous use of non-short-circuit logic Dodgy
NS: Questionable use of non-short-circuit logic Dodgy
PZLA: Consider returning a zero length array rather than null Dodgy
QF: Complicated, subtle or wrong increment in for-loop Dodgy
RCN: Redundant comparison of non-null value to null Dodgy
RCN: Redundant comparison of two null values Dodgy
RCN: Redundant nullcheck of value known to be non-null Dodgy
RCN: Redundant nullcheck of value known to be null Dodgy
REC: Exception is caught when Exception is not thrown Dodgy
RI: Class implements same interface as superclass Dodgy
RV: Method checks to see if result of String.indexOf is positive Dodgy
RV: Method discards result of readLine after checking if it is nonnull Dodgy
RV: Remainder of hashCode could be negative Dodgy
RV: Remainder of 32-bit signed random integer Dodgy
SA: Double assignment of local variable Dodgy
SA: Self assignment of local variable Dodgy
SF: Switch statement found where one case falls through to the next case Dodgy
SF: Switch statement found where default case is missing Dodgy
ST: Write to static field from instance method Dodgy
Se: private readResolve method not inherited by subclasses Dodgy
Se: Transient field of class that isn't Serializable. Dodgy
TQ: Explicit annotation inconsistent with use Dodgy
TQ: Explicit annotation inconsistent with use Dodgy
UCF: Useless control flow Dodgy
UCF: Useless control flow to next line Dodgy
UwF: Field not initialized in constructor Dodgy
XFB: Method directly allocates a specific implementation of xml interfaces Dodgy



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