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Classes descending from StandardError in an unaltered Rails 3.2.13 application.
StandardError
SQLite3::Exception
SQLite3::MemoryException
SQLite3::LockedException
SQLite3::BusyException
SQLite3::AbortException
SQLite3::PermissionException
SQLite3::InternalException
SQLite3::SQLException
SQLite3::NotADatabaseException
SQLite3::RangeException
SQLite3::FormatException
SQLite3::AuthorizationException
SQLite3::UnsupportedException
SQLite3::MisuseException
SQLite3::MismatchException
SQLite3::ConstraintException
SQLite3::TooBigException
SQLite3::SchemaChangedException
SQLite3::EmptyException
SQLite3::ProtocolException
SQLite3::CantOpenException
SQLite3::FullException
SQLite3::NotFoundException
SQLite3::CorruptException
SQLite3::IOException
SQLite3::InterruptException
SQLite3::ReadOnlyException
FiberError
ThreadError
IndexError
StopIteration
KeyError
Math::DomainError
LocalJumpError
IOError
EOFError
EncodingError
Encoding::ConverterNotFoundError
Encoding::InvalidByteSequenceError
Encoding::UndefinedConversionError
Encoding::CompatibilityError
RegexpError
SystemCallError
Errno::ERPCMISMATCH
Errno::EPROGUNAVAIL
Errno::EPROGMISMATCH
Errno::EPROCUNAVAIL
Errno::EPROCLIM
Errno::ENOTSUP
Errno::ENOATTR
Errno::ENEEDAUTH
Errno::EFTYPE
Errno::EBADRPC
Errno::EAUTH
Errno::EOWNERDEAD
Errno::ENOTRECOVERABLE
Errno::ECANCELED
Errno::EDQUOT
Errno::ESTALE
Errno::EINPROGRESS
Errno::EALREADY
Errno::EHOSTUNREACH
Errno::EHOSTDOWN
Errno::ECONNREFUSED
Errno::ETIMEDOUT
Errno::ETOOMANYREFS
Errno::ESHUTDOWN
Errno::ENOTCONN
Errno::EISCONN
Errno::ENOBUFS
Errno::ECONNRESET
Errno::ECONNABORTED
Errno::ENETRESET
Errno::ENETUNREACH
Errno::ENETDOWN
Errno::EADDRNOTAVAIL
Errno::EADDRINUSE
Errno::EAFNOSUPPORT
Errno::EPFNOSUPPORT
Errno::EOPNOTSUPP
Errno::ESOCKTNOSUPPORT
Errno::EPROTONOSUPPORT
Errno::ENOPROTOOPT
Errno::EPROTOTYPE
Errno::EMSGSIZE
Errno::EDESTADDRREQ
Errno::ENOTSOCK
Errno::EUSERS
Errno::EILSEQ
Errno::EOVERFLOW
Errno::EBADMSG
Errno::EMULTIHOP
Errno::EPROTO
Errno::ENOLINK
Errno::EREMOTE
Errno::ENOSR
Errno::ETIME
Errno::ENODATA
Errno::ENOSTR
Errno::EIDRM
Errno::ENOMSG
Errno::ELOOP
Errno::ENOTEMPTY
Errno::ENOSYS
Errno::ENOLCK
Errno::ENAMETOOLONG
Errno::EDEADLK
Errno::ERANGE
Errno::EDOM
Errno::EPIPE
Errno::EMLINK
Errno::EROFS
Errno::ESPIPE
Errno::ENOSPC
Errno::EFBIG
Errno::ETXTBSY
Errno::ENOTTY
Errno::EMFILE
Errno::ENFILE
Errno::EINVAL
Errno::EISDIR
Errno::ENOTDIR
Errno::ENODEV
Errno::EXDEV
Errno::EEXIST
Errno::EBUSY
Errno::ENOTBLK
Errno::EFAULT
Errno::EACCES
Errno::ENOMEM
Errno::EAGAIN
Errno::ECHILD
Errno::EBADF
Errno::ENOEXEC
Errno::E2BIG
Errno::ENXIO
Errno::EIO
Errno::EINTR
Errno::ESRCH
Errno::ENOENT
Errno::EPERM
Errno::NOERROR
RangeError
FloatDomainError
ZeroDivisionError
RuntimeError
Psych::Error
Psych::SyntaxError
Gem::Exception
Gem::VerificationError
Gem::RemoteSourceException
Gem::RemoteInstallationSkipped
Gem::RemoteInstallationCancelled
Gem::RemoteError
Gem::OperationNotSupportedError
Gem::InvalidSpecificationException
Gem::InstallError
Gem::GemNotFoundException
Gem::SpecificGemNotFoundException
Gem::FormatException
Gem::FilePermissionError
Gem::EndOfYAMLException
Gem::DocumentError
Gem::GemNotInHomeException
Gem::DependencyRemovalException
Gem::DependencyError
Gem::CommandLineError
Gem::RemoteFetcher::FetchError
Gem::RemoteFetcher::UnknownHostError
Timeout::Error
Resolv::ResolvTimeout
Psych::Exception
Psych::BadAlias
Logger::Error
Logger::ShiftingError
OptionParser::ParseError
OptionParser::InvalidArgument
OptionParser::AmbiguousArgument
OptionParser::InvalidOption
OptionParser::MissingArgument
OptionParser::NeedlessArgument
OptionParser::AmbiguousOption
NameError
NoMethodError
ActiveModel::MissingAttributeError
ActiveRecord::UnknownAttributeError
ArgumentError
Gem::Requirement::BadRequirementError
I18n::ArgumentError
I18n::UnknownFileType
I18n::ReservedInterpolationKey
I18n::MissingInterpolationArgument
I18n::InvalidPluralizationData
I18n::MissingTranslationData
I18n::InvalidLocaleData
I18n::InvalidLocale
ActiveResource::MissingPrefixParam
TypeError
Hash::DisallowedType
Bundler::MarshalError
Bundler::InvalidSpecSet
Bundler::BundlerError
Bundler::VersionConflict
Bundler::LockfileError
Bundler::SecurityError
Bundler::RubyVersionMismatch
Bundler::HTTPError
Bundler::ProductionError
Bundler::InvalidOption
Bundler::GemspecError
Bundler::DeprecatedError
Bundler::GitError
Bundler::PathError
Bundler::InstallHookError
Bundler::InstallError
Bundler::GemfileError
Bundler::GemNotFound
Bundler::GemfileNotFound
TSort::Cyclic
SocketError
Racc::ParseError
OpenSSL::OpenSSLError
OpenSSL::SSL::Session::SessionError
OpenSSL::SSL::SSLError
OpenSSL::Random::RandomError
OpenSSL::PKey::EC::Point::Error
OpenSSL::PKey::EC::Group::Error
OpenSSL::PKey::PKeyError
OpenSSL::PKey::ECError
OpenSSL::PKey::DHError
OpenSSL::PKey::DSAError
OpenSSL::PKey::RSAError
OpenSSL::PKCS5::PKCS5Error
OpenSSL::PKCS7::PKCS7Error
OpenSSL::PKCS12::PKCS12Error
OpenSSL::Netscape::SPKIError
OpenSSL::HMACError
OpenSSL::Digest::DigestError
OpenSSL::ConfigError
OpenSSL::Cipher::CipherError
OpenSSL::BNError
OpenSSL::OCSP::OCSPError
OpenSSL::X509::StoreError
OpenSSL::X509::RevokedError
OpenSSL::X509::RequestError
OpenSSL::X509::NameError
OpenSSL::X509::ExtensionError
OpenSSL::X509::CRLError
OpenSSL::X509::CertificateError
OpenSSL::X509::AttributeError
OpenSSL::ASN1::ASN1Error
OpenSSL::Engine::EngineError
ExecJS::Error
ExecJS::RuntimeError
ExecJS::RuntimeUnavailable
ExecJS::ProgramError
StringScanner::Error
URI::Error
URI::BadURIError
URI::InvalidComponentError
URI::InvalidURIError
JSON::JSONError
JSON::MissingUnicodeSupport
JSON::GeneratorError
JSON::ParserError
JSON::NestingError
JSON::CircularDatastructure
Resolv::DNS::EncodeError
Resolv::DNS::DecodeError
Resolv::ResolvError
Resolv::DNS::Config::OtherResolvError
Resolv::DNS::Config::NXDomain
Resolv::DNS::Requester::RequestError
Journey::Router::RoutingError
MultiJson::LoadError
ActionController::ActionControllerError
ActionController::UnknownHttpMethod
ActionController::SessionOverflowError
ActionController::MissingFile
ActionController::UnknownController
ActionController::MethodNotAllowed
ActionController::NotImplemented
ActionController::RoutingError
ActionController::RenderError
Zlib::Error
Zlib::VersionError
Zlib::BufError
Zlib::MemError
Zlib::StreamError
Zlib::DataError
Zlib::NeedDict
Zlib::StreamEnd
Zlib::GzipFile::Error
Zlib::GzipFile::LengthError
Zlib::GzipFile::CRCError
Zlib::GzipFile::NoFooter
ActiveSupport::SafeBuffer::SafeConcatError
ActiveResource::ConnectionError
ActiveResource::ClientError
ActiveResource::ResourceGone
ActiveResource::ResourceConflict
ActiveResource::ResourceNotFound
ActiveResource::ForbiddenAccess
ActiveResource::UnauthorizedAccess
ActiveResource::BadRequest
ActiveResource::MethodNotAllowed
ActiveResource::Redirection
ActiveResource::SSLError
ActiveResource::TimeoutError
ActiveResource::ServerError
Sass::SyntaxError
Sass::UnitConversionError
TZInfo::NoOffsetsDefined
TZInfo::UnknownTimezone
TZInfo::InvalidTimezoneIdentifier
TZInfo::PeriodNotFound
TZInfo::AmbiguousTime
TZInfo::InvalidCountryCode
ActionDispatch::Cookies::CookieOverflow
ActiveRecord::ActiveRecordError
ActiveRecord::UnknownPrimaryKey
ActiveRecord::MultiparameterAssignmentErrors
ActiveRecord::AttributeAssignmentError
ActiveRecord::DangerousAttributeError
ActiveRecord::Rollback
ActiveRecord::ReadOnlyRecord
ActiveRecord::ConfigurationError
ActiveRecord::StaleObjectError
ActiveRecord::PreparedStatementInvalid
ActiveRecord::StatementInvalid
ActiveRecord::WrappedDatabaseException
ActiveRecord::InvalidForeignKey
ActiveRecord::RecordNotUnique
ActiveRecord::ThrowResult
ActiveRecord::RecordNotSaved
ActiveRecord::RecordNotFound
ActiveRecord::ConnectionNotEstablished
ActiveRecord::ConnectionTimeoutError
ActiveRecord::AdapterNotFound
ActiveRecord::AdapterNotSpecified
ActiveRecord::SerializationTypeMismatch
ActiveRecord::AssociationTypeMismatch
ActiveRecord::SubclassNotFound
ActiveRecord::RecordInvalid
ActiveRecord::DeleteRestrictionError
ActiveRecord::ReadOnlyAssociation
ActiveRecord::EagerLoadPolymorphicError
ActiveRecord::HasAndBelongsToManyAssociationForeignKeyNeeded
ActiveRecord::HasManyThroughNestedAssociationsAreReadonly
ActiveRecord::HasManyThroughCantDissociateNewRecords
ActiveRecord::HasManyThroughCantAssociateNewRecords
ActiveRecord::HasManyThroughCantAssociateThroughHasOneOrManyReflection
ActiveRecord::HasManyThroughSourceAssociationNotFoundError
ActiveRecord::HasOneThroughCantAssociateThroughCollection
ActiveRecord::HasManyThroughAssociationPointlessSourceTypeError
ActiveRecord::HasManyThroughAssociationPolymorphicThroughError
ActiveRecord::HasManyThroughAssociationPolymorphicSourceError
ActiveRecord::HasManyThroughAssociationNotFoundError
ActiveRecord::InverseOfAssociationNotFoundError
ActiveRecord::NestedAttributes::TooManyRecords
ActiveRecord::Transactions::TransactionError
ActiveModel::MassAssignmentSecurity::Error
ActiveModel::StrictValidationFailed
ActiveSupport::JSON::Encoding::CircularReferenceError
Sprockets::Error
Sprockets::UnserializeError
Sprockets::FileOutsidePaths
Sprockets::FileNotFound
Sprockets::EncodingError
Sprockets::ContentTypeMismatch
Sprockets::CircularDependencyError
Sprockets::ArgumentError
ActionDispatch::RemoteIp::IpSpoofAttackError
ActionDispatch::Session::SessionRestoreError
@cisolarix

Holy shit, such a long list.

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