Most repeated
The following class names are repeated, 19 Handler, 16 Messages, 13 Util, 10 Element, 8 Attribute, 7 SecuritySupport, 7 Node, 6 Provider, 6 Header, 6 FactoryFinder, 6 Document. 5 SOAPBinding, 5 Repository, 5 Ref, 5 ORB, 5 Name, 5 Constants, 5 Connection, 5 Comment, 5 Binding, 5 Attributes,This excludes the Apache XML library which repeats many names. If you include these libraries there are 26 classes called SecuritySupport.
Four times
Window, Version, Utility, Timer, Text, State, Signature, ServiceName, ServiceConfigurationError, Service, ResourceLoader, Queue, Policy, Parser, Operation, NativeLibLoader, Message, Label, JSObject, GetPropertyAction, FactoryFinder$ConfigurationError, Event, ConstantPool, AppletAudioClip, Action,
Three times
XMLWriter, Wrapper, WildcardTypeImpl, Visitor, Validator, Types, TypeMismatch, TypeInfo, Type, Trace, Token, Timestamp, Target, Symbol, StyleSheet, SOAPFault, SOAPConstants, Scope, Schema, ResourceManager, Resource, Resolver, Request, Reference, Properties, ProgressMonitor, PrincipalImpl, Principal, Port, PooledConnection, Pool, Pipe, Patcher, ParseException, OutputStream, ObjectStreamField, Navigator, NamespaceSupport$Context, NamespaceSupport, MimeType, MemoryCache, MarshalException, Manifest, Main, Location, List, JarVerifier, IOR, Invoker, InvalidName, Introspector, InputStream, Import, ImageCache, HTMLDocument, HTMLCollection, Headers, FinalArrayList, Filter, FileSystem, FactoryImpl, Extension, EventListener, ErrorHandler, Entity, EncryptedPrivateKeyInfo, Delegate, DataSource, CurrentOperations, CurrentHelper, Current, Counter, Context, ContentType, Config, Code, CharacterData, Certificate, CacheTable, Cache, Bridge, Base64, Authenticator, AttributeList, ArrayType, Array, AppletAudioClip$1, Annotation,
Appearing twice
Too many to mention.
From http://vanillajava.blogspot.com/2012/01/generic-class-names-to-avoid.html
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