JDK 8 tools.jar is the JAR file for JDK 8 tools. It contains Java classes to support different JDK tool commands:

sun.applet.Main - Supports the "appletviewer" command.
sun.rmi.rmic.Main - Supports the "rmic" command.
sun.security.tools.jarsigner.Main - Supports the "jarsigner" command.
sun.tools.jar.Main - Supports the "jar" command.
sun.tools.javac.Main - Supports the "javac" command. 
sun.tools.jcmd.JCmd - Supports the "jcmd" command.
sun.tools.jinfo.JInfo - Supports the "jinfo" command.
sun.tools.jmap.JMap - Supports the "jmap" command.
sun.tools.jps.Jps - Supports the "jps" command.
sun.tools.jstack.JStack - Supports the "jstack" command.
sun.tools.jstat.Jstat - Supports the "jstat" command.
sun.tools.jstatd.Jstatd - Supports the "jstatd" command.
sun.tools.native2ascii.Main - Supports the "native2ascii" command.
sun.tools.serialver.SerialVer - Supports the "serialver" command.
... 

JAR File Information:

Directory of C:\fyicenter\jdk-1.8.0_191\lib
      18,256,125 tools.jar

Package Content:

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com/sun/tools/doclint/HtmlTag.class
com/sun/tools/doclint/Messages.class
com/sun/tools/doclint/resources/doclint.class
com/sun/tools/doclint/resources/doclint_ja.class
com/sun/tools/doclint/resources/doclint_zh_CN.class
com/sun/tools/example/debug/expr/ASCII_UCodeESC_CharStream.class
com/sun/tools/example/debug/expr/ExpressionParser.class
com/sun/tools/example/debug/expr/ExpressionParserConstants.class
com/sun/tools/example/debug/expr/ExpressionParserTokenManager.class
com/sun/tools/example/debug/expr/JJExpressionParserCalls.class
com/sun/tools/example/debug/expr/LValue.class
com/sun/tools/example/debug/expr/ParseException.class
com/sun/tools/example/debug/expr/Token.class
com/sun/tools/example/debug/expr/TokenMgrError.class
com/sun/tools/example/debug/tty/AccessWatchpointSpec.class
com/sun/tools/example/debug/tty/AmbiguousMethodException.class
com/sun/tools/example/debug/tty/BreakpointSpec.class
com/sun/tools/example/debug/tty/Commands.class
com/sun/tools/example/debug/tty/Env.class
com/sun/tools/example/debug/tty/EventHandler.class
com/sun/tools/example/debug/tty/EventNotifier.class
com/sun/tools/example/debug/tty/EventRequestSpec.class
com/sun/tools/example/debug/tty/EventRequestSpecList.class
com/sun/tools/example/debug/tty/ExceptionSpec.class
com/sun/tools/example/debug/tty/LineNotFoundException.class
com/sun/tools/example/debug/tty/MalformedMemberNameException.class
com/sun/tools/example/debug/tty/MessageOutput.class
com/sun/tools/example/debug/tty/ModificationWatchpointSpec.class
com/sun/tools/example/debug/tty/PatternReferenceTypeSpec.class
com/sun/tools/example/debug/tty/ReferenceTypeSpec.class
com/sun/tools/example/debug/tty/SourceMapper.class
com/sun/tools/example/debug/tty/ThreadGroupIterator.class
com/sun/tools/example/debug/tty/ThreadInfo.class
com/sun/tools/example/debug/tty/ThreadIterator.class
com/sun/tools/example/debug/tty/TTY.class
com/sun/tools/example/debug/tty/TTYResources.class
com/sun/tools/example/debug/tty/TTYResources_ja.class
com/sun/tools/example/debug/tty/TTYResources_zh_CN.class
com/sun/tools/example/debug/tty/VMConnection.class
com/sun/tools/example/debug/tty/VMNotConnectedException.class
com/sun/tools/example/debug/tty/WatchpointSpec.class
com/sun/tools/extcheck/ExtCheck.class
com/sun/tools/extcheck/Main.class
com/sun/tools/hat/internal/model/AbstractJavaHeapObjectVisitor.class
com/sun/tools/hat/internal/model/ArrayTypeCodes.class
com/sun/tools/hat/internal/model/HackJavaValue.class
com/sun/tools/hat/internal/model/JavaBoolean.class
com/sun/tools/hat/internal/model/JavaByte.class
com/sun/tools/hat/internal/model/JavaChar.class
com/sun/tools/hat/internal/model/JavaClass.class
com/sun/tools/hat/internal/model/JavaDouble.class
com/sun/tools/hat/internal/model/JavaField.class
com/sun/tools/hat/internal/model/JavaFloat.class
com/sun/tools/hat/internal/model/JavaHeapObject.class
com/sun/tools/hat/internal/model/JavaHeapObjectVisitor.class
com/sun/tools/hat/internal/model/JavaInt.class
com/sun/tools/hat/internal/model/JavaLazyReadObject.class
com/sun/tools/hat/internal/model/JavaLong.class
com/sun/tools/hat/internal/model/JavaObject.class
com/sun/tools/hat/internal/model/JavaObjectArray.class
com/sun/tools/hat/internal/model/JavaObjectRef.class
com/sun/tools/hat/internal/model/JavaShort.class
com/sun/tools/hat/internal/model/JavaStatic.class
com/sun/tools/hat/internal/model/JavaThing.class
com/sun/tools/hat/internal/model/JavaValue.class
com/sun/tools/hat/internal/model/JavaValueArray.class
com/sun/tools/hat/internal/model/ReachableExcludes.class
com/sun/tools/hat/internal/model/ReachableExcludesImpl.class
com/sun/tools/hat/internal/model/ReachableObjects.class
com/sun/tools/hat/internal/model/ReferenceChain.class
com/sun/tools/hat/internal/model/Root.class
com/sun/tools/hat/internal/model/Snapshot.class
com/sun/tools/hat/internal/model/StackFrame.class
com/sun/tools/hat/internal/model/StackTrace.class
com/sun/tools/hat/internal/oql/ObjectVisitor.class
com/sun/tools/hat/internal/oql/OQLEngine.class
com/sun/tools/hat/internal/oql/OQLException.class
com/sun/tools/hat/internal/oql/OQLQuery.class
com/sun/tools/hat/internal/parser/FileReadBuffer.class
com/sun/tools/hat/internal/parser/HprofReader.class
com/sun/tools/hat/internal/parser/MappedReadBuffer.class
com/sun/tools/hat/internal/parser/PositionDataInputStream.class
com/sun/tools/hat/internal/parser/PositionInputStream.class
com/sun/tools/hat/internal/parser/ReadBuffer.class
com/sun/tools/hat/internal/parser/Reader.class
com/sun/tools/hat/internal/server/AllClassesQuery.class
com/sun/tools/hat/internal/server/AllRootsQuery.class
com/sun/tools/hat/internal/server/ClassQuery.class
com/sun/tools/hat/internal/server/FinalizerObjectsQuery.class
com/sun/tools/hat/internal/server/FinalizerSummaryQuery.class
com/sun/tools/hat/internal/server/HistogramQuery.class
com/sun/tools/hat/internal/server/HttpReader.class
com/sun/tools/hat/internal/server/InstancesCountQuery.class
com/sun/tools/hat/internal/server/InstancesQuery.class
com/sun/tools/hat/internal/server/ObjectQuery.class
com/sun/tools/hat/internal/server/OQLHelp.class
com/sun/tools/hat/internal/server/OQLQuery.class
com/sun/tools/hat/internal/server/PlatformClasses.class
com/sun/tools/hat/internal/server/QueryHandler.class
com/sun/tools/hat/internal/server/QueryListener.class
com/sun/tools/hat/internal/server/ReachableQuery.class
com/sun/tools/hat/internal/server/RefsByTypeQuery.class
com/sun/tools/hat/internal/server/RootsQuery.class
com/sun/tools/hat/internal/server/RootStackQuery.class
com/sun/tools/hat/internal/util/ArraySorter.class
com/sun/tools/hat/internal/util/Comparer.class
com/sun/tools/hat/internal/util/CompositeEnumeration.class
com/sun/tools/hat/internal/util/Misc.class
com/sun/tools/hat/internal/util/VectorSorter.class
com/sun/tools/hat/Main.class
com/sun/tools/internal/jxc/ap/AnnotationParser.class
com/sun/tools/internal/jxc/ap/Const.class
com/sun/tools/internal/jxc/ap/ErrorReceiverImpl.class
com/sun/tools/internal/jxc/ap/InlineAnnotationReaderImpl.class
com/sun/tools/internal/jxc/ap/Messages.class
com/sun/tools/internal/jxc/ap/Options.class
com/sun/tools/internal/jxc/ap/SchemaGenerator.class
com/sun/tools/internal/jxc/ap/SecureLoader.class
com/sun/tools/internal/jxc/api/impl/j2s/JavaCompilerImpl.class
com/sun/tools/internal/jxc/api/impl/j2s/JAXBModelImpl.class
com/sun/tools/internal/jxc/api/JXC.class
com/sun/tools/internal/jxc/ConfigReader.class
com/sun/tools/internal/jxc/gen/config/AttributesImpl.class
com/sun/tools/internal/jxc/gen/config/Classes.class
com/sun/tools/internal/jxc/gen/config/Config.class
com/sun/tools/internal/jxc/gen/config/NGCCEventReceiver.class
com/sun/tools/internal/jxc/gen/config/NGCCEventSource.class
com/sun/tools/internal/jxc/gen/config/NGCCHandler.class
com/sun/tools/internal/jxc/gen/config/NGCCInterleaveFilter.class
com/sun/tools/internal/jxc/gen/config/NGCCRuntime.class
com/sun/tools/internal/jxc/gen/config/Schema.class
com/sun/tools/internal/jxc/Messages.class
com/sun/tools/internal/jxc/model/nav/ApNavigator.class
com/sun/tools/internal/jxc/NGCCRuntimeEx.class
com/sun/tools/internal/jxc/SchemaGenerator.class
com/sun/tools/internal/jxc/SchemaGeneratorFacade.class
com/sun/tools/internal/jxc/SecureLoader.class
com/sun/tools/internal/ws/api/TJavaGeneratorExtension.class
com/sun/tools/internal/ws/api/wsdl/TWSDLExtensible.class
com/sun/tools/internal/ws/api/wsdl/TWSDLExtension.class
com/sun/tools/internal/ws/api/wsdl/TWSDLExtensionHandler.class
com/sun/tools/internal/ws/api/wsdl/TWSDLOperation.class
com/sun/tools/internal/ws/api/wsdl/TWSDLParserContext.class
com/sun/tools/internal/ws/api/WsgenExtension.class
com/sun/tools/internal/ws/api/WsgenProtocol.class
com/sun/tools/internal/ws/Invoker.class
com/sun/tools/internal/ws/processor/generator/CustomExceptionGenerator.class
com/sun/tools/internal/ws/processor/generator/GeneratorBase.class
com/sun/tools/internal/ws/processor/generator/GeneratorConstants.class
com/sun/tools/internal/ws/processor/generator/GeneratorException.class
com/sun/tools/internal/ws/processor/generator/GeneratorExtension.class
com/sun/tools/internal/ws/processor/generator/GeneratorUtil.class
com/sun/tools/internal/ws/processor/generator/JavaGeneratorExtensionFacade.class
com/sun/tools/internal/ws/processor/generator/JwsImplGenerator.class
com/sun/tools/internal/ws/processor/generator/Names.class
com/sun/tools/internal/ws/processor/generator/SeiGenerator.class
com/sun/tools/internal/ws/processor/generator/ServiceGenerator.class
com/sun/tools/internal/ws/processor/generator/W3CAddressingJavaGeneratorExtension.class
com/sun/tools/internal/ws/processor/model/AbstractType.class
com/sun/tools/internal/ws/processor/model/AsyncOperation.class
com/sun/tools/internal/ws/processor/model/AsyncOperationType.class
com/sun/tools/internal/ws/processor/model/Block.class
com/sun/tools/internal/ws/processor/model/exporter/ExternalObject.class
com/sun/tools/internal/ws/processor/model/ExtendedModelVisitor.class
com/sun/tools/internal/ws/processor/model/Fault.class
com/sun/tools/internal/ws/processor/model/HeaderFault.class
com/sun/tools/internal/ws/processor/model/java/JavaArrayType.class
com/sun/tools/internal/ws/processor/model/java/JavaException.class
com/sun/tools/internal/ws/processor/model/java/JavaInterface.class
com/sun/tools/internal/ws/processor/model/java/JavaMethod.class
com/sun/tools/internal/ws/processor/model/java/JavaParameter.class
com/sun/tools/internal/ws/processor/model/java/JavaSimpleType.class
com/sun/tools/internal/ws/processor/model/java/JavaStructureMember.class
com/sun/tools/internal/ws/processor/model/java/JavaStructureType.class
com/sun/tools/internal/ws/processor/model/java/JavaType.class
com/sun/tools/internal/ws/processor/model/jaxb/JAXBElementMember.class
com/sun/tools/internal/ws/processor/model/jaxb/JAXBMapping.class
com/sun/tools/internal/ws/processor/model/jaxb/JAXBModel.class
com/sun/tools/internal/ws/processor/model/jaxb/JAXBProperty.class
com/sun/tools/internal/ws/processor/model/jaxb/JAXBStructuredType.class
com/sun/tools/internal/ws/processor/model/jaxb/JAXBType.class
com/sun/tools/internal/ws/processor/model/jaxb/JAXBTypeAndAnnotation.class
com/sun/tools/internal/ws/processor/model/jaxb/JAXBTypeVisitor.class
com/sun/tools/internal/ws/processor/model/jaxb/RpcLitMember.class
com/sun/tools/internal/ws/processor/model/jaxb/RpcLitStructure.class
com/sun/tools/internal/ws/processor/model/jaxb/Util.class
com/sun/tools/internal/ws/processor/model/Message.class
com/sun/tools/internal/ws/processor/model/Model.class
com/sun/tools/internal/ws/processor/model/ModelException.class
com/sun/tools/internal/ws/processor/model/ModelObject.class
com/sun/tools/internal/ws/processor/model/ModelProperties.class
com/sun/tools/internal/ws/processor/model/ModelVisitor.class
com/sun/tools/internal/ws/processor/model/Operation.class
com/sun/tools/internal/ws/processor/model/Parameter.class
com/sun/tools/internal/ws/processor/model/Port.class
com/sun/tools/internal/ws/processor/model/Request.class
com/sun/tools/internal/ws/processor/model/Response.class
com/sun/tools/internal/ws/processor/model/Service.class
com/sun/tools/internal/ws/processor/modeler/annotation/AnnotationProcessorContext.class
com/sun/tools/internal/ws/processor/modeler/annotation/FaultInfo.class
com/sun/tools/internal/ws/processor/modeler/annotation/MakeSafeTypeVisitor.class
com/sun/tools/internal/ws/processor/modeler/annotation/MemberInfo.class
com/sun/tools/internal/ws/processor/modeler/annotation/ModelBuilder.class
com/sun/tools/internal/ws/processor/modeler/annotation/TypeModeler.class
com/sun/tools/internal/ws/processor/modeler/annotation/TypeMoniker.class
com/sun/tools/internal/ws/processor/modeler/annotation/TypeMonikerFactory.class
com/sun/tools/internal/ws/processor/modeler/annotation/WebServiceAp.class
com/sun/tools/internal/ws/processor/modeler/annotation/WebServiceConstants.class
com/sun/tools/internal/ws/processor/modeler/annotation/WebServiceVisitor.class
com/sun/tools/internal/ws/processor/modeler/annotation/WebServiceWrapperGenerator.class
com/sun/tools/internal/ws/processor/modeler/annotation/WrapperInfo.class
com/sun/tools/internal/ws/processor/modeler/JavaSimpleTypeCreator.class
com/sun/tools/internal/ws/processor/modeler/Modeler.class
com/sun/tools/internal/ws/processor/modeler/ModelerConstants.class
com/sun/tools/internal/ws/processor/modeler/ModelerException.class
com/sun/tools/internal/ws/processor/modeler/wsdl/AccessorElement.class
com/sun/tools/internal/ws/processor/modeler/wsdl/ClassNameAllocatorImpl.class
com/sun/tools/internal/ws/processor/modeler/wsdl/ConsoleErrorReporter.class
com/sun/tools/internal/ws/processor/modeler/wsdl/JAXBModelBuilder.class
com/sun/tools/internal/ws/processor/modeler/wsdl/ModelerUtils.class
com/sun/tools/internal/ws/processor/modeler/wsdl/PseudoSchemaBuilder.class
com/sun/tools/internal/ws/processor/modeler/wsdl/WSDLModeler.class
com/sun/tools/internal/ws/processor/modeler/wsdl/WSDLModelerBase.class
com/sun/tools/internal/ws/processor/ProcessorException.class
com/sun/tools/internal/ws/processor/util/ClassNameCollector.class
com/sun/tools/internal/ws/processor/util/DirectoryUtil.class
com/sun/tools/internal/ws/processor/util/IndentingWriter.class
com/sun/tools/internal/ws/resources/ConfigurationMessages.class
com/sun/tools/internal/ws/resources/GeneratorMessages.class
com/sun/tools/internal/ws/resources/JavacompilerMessages.class
com/sun/tools/internal/ws/resources/ModelerMessages.class
com/sun/tools/internal/ws/resources/ModelMessages.class
com/sun/tools/internal/ws/resources/ProcessorMessages.class
com/sun/tools/internal/ws/resources/UtilMessages.class
com/sun/tools/internal/ws/resources/WebserviceapMessages.class
com/sun/tools/internal/ws/resources/WscompileMessages.class
com/sun/tools/internal/ws/resources/WsdlMessages.class
com/sun/tools/internal/ws/spi/WSToolsObjectFactory.class
com/sun/tools/internal/ws/ToolVersion.class
com/sun/tools/internal/ws/util/ClassNameInfo.class
com/sun/tools/internal/ws/util/ForkEntityResolver.class
com/sun/tools/internal/ws/util/WSDLFetcher.class
com/sun/tools/internal/ws/util/WSDLParseException.class
com/sun/tools/internal/ws/util/WSToolsObjectFactoryImpl.class
com/sun/tools/internal/ws/util/xml/XmlUtil.class
com/sun/tools/internal/ws/wscompile/AbortException.class
com/sun/tools/internal/ws/wscompile/AuthInfo.class
com/sun/tools/internal/ws/wscompile/BadCommandLineException.class
com/sun/tools/internal/ws/wscompile/ErrorReceiver.class
com/sun/tools/internal/ws/wscompile/ErrorReceiverFilter.class
com/sun/tools/internal/ws/wscompile/FilerCodeWriter.class
com/sun/tools/internal/ws/wscompile/JavaCompilerHelper.class
com/sun/tools/internal/ws/wscompile/Options.class
com/sun/tools/internal/ws/wscompile/plugin/at_generated/PluginImpl.class
com/sun/tools/internal/ws/wscompile/Plugin.class
com/sun/tools/internal/ws/wscompile/WSCodeWriter.class
com/sun/tools/internal/ws/wscompile/WsgenOptions.class
com/sun/tools/internal/ws/wscompile/WsgenTool.class
com/sun/tools/internal/ws/wscompile/WsimportListener.class
com/sun/tools/internal/ws/wscompile/WsimportOptions.class
com/sun/tools/internal/ws/wscompile/WsimportTool.class
com/sun/tools/internal/ws/wsdl/document/Binding.class
com/sun/tools/internal/ws/wsdl/document/BindingFault.class
com/sun/tools/internal/ws/wsdl/document/BindingInput.class
com/sun/tools/internal/ws/wsdl/document/BindingOperation.class
com/sun/tools/internal/ws/wsdl/document/BindingOutput.class
com/sun/tools/internal/ws/wsdl/document/Definitions.class
com/sun/tools/internal/ws/wsdl/document/Documentation.class
com/sun/tools/internal/ws/wsdl/document/Fault.class
com/sun/tools/internal/ws/wsdl/document/http/HTTPAddress.class
com/sun/tools/internal/ws/wsdl/document/http/HTTPBinding.class
com/sun/tools/internal/ws/wsdl/document/http/HTTPConstants.class
com/sun/tools/internal/ws/wsdl/document/http/HTTPOperation.class
com/sun/tools/internal/ws/wsdl/document/http/HTTPUrlEncoded.class
com/sun/tools/internal/ws/wsdl/document/http/HTTPUrlReplacement.class
com/sun/tools/internal/ws/wsdl/document/Import.class
com/sun/tools/internal/ws/wsdl/document/Input.class
com/sun/tools/internal/ws/wsdl/document/jaxws/CustomName.class
com/sun/tools/internal/ws/wsdl/document/jaxws/Exception.class
com/sun/tools/internal/ws/wsdl/document/jaxws/JAXWSBinding.class
com/sun/tools/internal/ws/wsdl/document/jaxws/JAXWSBindingsConstants.class
Next part >>

⇒ JRE 8 charsets.jar - Character Set Encoding

⇐ JDK 8 sa-jdi.jar - HSDB (Hotspot Debugger)

⇑ Download and Use JDK 8

⇑⇑ FAQ for JDK (Java Development Kit)