JDK 8 sa-jdi.jar is the JAR file for JDK 8 SA (Serviceability Agent) HSDB (Hotspot Debugger) tools. It contains Java classes to support different SA HSDB tool:

sun.jvm.hotspot.CLHSDB - Supports the CL (Command Line) version of SA HSDB. 
sun.jvm.hotspot.HSDB - Supports the GUI (Graphical User Interface) version of SA HSDB. 
sun.jvm.hotspot.tools.soql.JSDB - Supports the JSDB (JavaScript Debugger).
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JAR File Information:

Directory of C:\fyicenter\jdk-1.8.0_191\lib
       2,415,568 sa-jdi.jar

Package Content:

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sun/jvm/hotspot/runtime/vmSymbols.class
sun/jvm/hotspot/runtime/VMVersionMismatchException.class
sun/jvm/hotspot/runtime/WatcherThread.class
sun/jvm/hotspot/runtime/win32_amd64/Win32AMD64JavaThreadPDAccess.class
sun/jvm/hotspot/runtime/win32_x86/Win32X86JavaThreadPDAccess.class
sun/jvm/hotspot/runtime/x86/X86CurrentFrameGuess.class
sun/jvm/hotspot/runtime/x86/X86Frame.class
sun/jvm/hotspot/runtime/x86/X86JavaCallWrapper.class
sun/jvm/hotspot/runtime/x86/X86RegisterMap.class
sun/jvm/hotspot/SALauncherLoader.class
sun/jvm/hotspot/StackTrace.class
sun/jvm/hotspot/tools/ClassLoaderStats.class
sun/jvm/hotspot/tools/DumpJFR.class
sun/jvm/hotspot/tools/FinalizerInfo.class
sun/jvm/hotspot/tools/FlagDumper.class
sun/jvm/hotspot/tools/HeapDumper.class
sun/jvm/hotspot/tools/HeapSummary.class
sun/jvm/hotspot/tools/jcore/ByteCodeRewriter.class
sun/jvm/hotspot/tools/jcore/ClassDump.class
sun/jvm/hotspot/tools/jcore/ClassFilter.class
sun/jvm/hotspot/tools/jcore/ClassWriter.class
sun/jvm/hotspot/tools/jcore/NameFilter.class
sun/jvm/hotspot/tools/jcore/PackageNameFilter.class
sun/jvm/hotspot/tools/JInfo.class
sun/jvm/hotspot/tools/JMap.class
sun/jvm/hotspot/tools/JSnap.class
sun/jvm/hotspot/tools/JStack.class
sun/jvm/hotspot/tools/ObjectHistogram.class
sun/jvm/hotspot/tools/PMap.class
sun/jvm/hotspot/tools/PStack.class
sun/jvm/hotspot/tools/soql/JSDB.class
sun/jvm/hotspot/tools/soql/SOQL.class
sun/jvm/hotspot/tools/StackTrace.class
sun/jvm/hotspot/tools/SysPropsDumper.class
sun/jvm/hotspot/tools/Tool.class
sun/jvm/hotspot/types/AddressField.class
sun/jvm/hotspot/types/basic/BasicAddressFieldWrapper.class
sun/jvm/hotspot/types/basic/BasicCIntegerField.class
sun/jvm/hotspot/types/basic/BasicCIntegerType.class
sun/jvm/hotspot/types/basic/BasicField.class
sun/jvm/hotspot/types/basic/BasicFieldWrapper.class
sun/jvm/hotspot/types/basic/BasicJBooleanField.class
sun/jvm/hotspot/types/basic/BasicJByteField.class
sun/jvm/hotspot/types/basic/BasicJCharField.class
sun/jvm/hotspot/types/basic/BasicJDoubleField.class
sun/jvm/hotspot/types/basic/BasicJFloatField.class
sun/jvm/hotspot/types/basic/BasicJIntField.class
sun/jvm/hotspot/types/basic/BasicJLongField.class
sun/jvm/hotspot/types/basic/BasicJShortField.class
sun/jvm/hotspot/types/basic/BasicNarrowOopField.class
sun/jvm/hotspot/types/basic/BasicOopField.class
sun/jvm/hotspot/types/basic/BasicPointerType.class
sun/jvm/hotspot/types/basic/BasicType.class
sun/jvm/hotspot/types/basic/BasicTypeDataBase.class
sun/jvm/hotspot/types/basic/BasicVtblAccess.class
sun/jvm/hotspot/types/basic/VtblAccess.class
sun/jvm/hotspot/types/CIntegerField.class
sun/jvm/hotspot/types/CIntegerType.class
sun/jvm/hotspot/types/Field.class
sun/jvm/hotspot/types/JBooleanField.class
sun/jvm/hotspot/types/JByteField.class
sun/jvm/hotspot/types/JCharField.class
sun/jvm/hotspot/types/JDoubleField.class
sun/jvm/hotspot/types/JFloatField.class
sun/jvm/hotspot/types/JIntField.class
sun/jvm/hotspot/types/JLongField.class
sun/jvm/hotspot/types/JShortField.class
sun/jvm/hotspot/types/NarrowOopField.class
sun/jvm/hotspot/types/OopField.class
sun/jvm/hotspot/types/PointerType.class
sun/jvm/hotspot/types/Type.class
sun/jvm/hotspot/types/TypeDataBase.class
sun/jvm/hotspot/types/WrongTypeException.class
sun/jvm/hotspot/ui/action/FindAction.class
sun/jvm/hotspot/ui/action/FindClassesAction.class
sun/jvm/hotspot/ui/action/FindCrashesAction.class
sun/jvm/hotspot/ui/action/HSDBActionManager.class
sun/jvm/hotspot/ui/action/InspectAction.class
sun/jvm/hotspot/ui/action/JavaStackTraceAction.class
sun/jvm/hotspot/ui/action/MemoryAction.class
sun/jvm/hotspot/ui/action/ShowAction.class
sun/jvm/hotspot/ui/action/ThreadInfoAction.class
sun/jvm/hotspot/ui/AnnotatedMemoryPanel.class
sun/jvm/hotspot/ui/Annotation.class
sun/jvm/hotspot/ui/classbrowser/ClassBrowserPanel.class
sun/jvm/hotspot/ui/classbrowser/CodeViewerPanel.class
sun/jvm/hotspot/ui/classbrowser/HTMLGenerator.class
sun/jvm/hotspot/ui/CommandProcessorPanel.class
sun/jvm/hotspot/ui/DeadlockDetectionPanel.class
sun/jvm/hotspot/ui/DebuggerConsolePanel.class
sun/jvm/hotspot/ui/EditableAtEndDocument.class
sun/jvm/hotspot/ui/Editor.class
sun/jvm/hotspot/ui/EditorCommands.class
sun/jvm/hotspot/ui/EditorFactory.class
sun/jvm/hotspot/ui/FindByQueryPanel.class
sun/jvm/hotspot/ui/FindInCodeCachePanel.class
sun/jvm/hotspot/ui/FindInHeapPanel.class
sun/jvm/hotspot/ui/FindPanel.class
sun/jvm/hotspot/ui/FrameWrapper.class
sun/jvm/hotspot/ui/GraphicsUtilities.class
sun/jvm/hotspot/ui/HeapParametersPanel.class
sun/jvm/hotspot/ui/HighPrecisionJScrollBar.class
sun/jvm/hotspot/ui/HistoryComboBox.class
sun/jvm/hotspot/ui/Inspector.class
sun/jvm/hotspot/ui/JavaStackTracePanel.class
sun/jvm/hotspot/ui/JavaThreadsPanel.class
sun/jvm/hotspot/ui/JFrameWrapper.class
sun/jvm/hotspot/ui/JInternalFrameWrapper.class
sun/jvm/hotspot/ui/MemoryPanel.class
sun/jvm/hotspot/ui/MemoryViewer.class
sun/jvm/hotspot/ui/MonitorCacheDumpPanel.class
sun/jvm/hotspot/ui/ObjectHistogramPanel.class
sun/jvm/hotspot/ui/ObjectListPanel.class
sun/jvm/hotspot/ui/ProcessListPanel.class
sun/jvm/hotspot/ui/ProgressBarPanel.class
sun/jvm/hotspot/ui/SAEditorPane.class
sun/jvm/hotspot/ui/SAListener.class
sun/jvm/hotspot/ui/SAPanel.class
sun/jvm/hotspot/ui/SourceCodePanel.class
sun/jvm/hotspot/ui/StringTransferable.class
sun/jvm/hotspot/ui/SysPropsPanel.class
sun/jvm/hotspot/ui/table/LongCellRenderer.class
sun/jvm/hotspot/ui/table/SortableTableModel.class
sun/jvm/hotspot/ui/table/SortHeaderCellRenderer.class
sun/jvm/hotspot/ui/table/SortHeaderMouseAdapter.class
sun/jvm/hotspot/ui/table/TableModelComparator.class
sun/jvm/hotspot/ui/ThreadInfoPanel.class
sun/jvm/hotspot/ui/tree/BadAddressTreeNodeAdapter.class
sun/jvm/hotspot/ui/tree/BooleanTreeNodeAdapter.class
sun/jvm/hotspot/ui/tree/CharTreeNodeAdapter.class
sun/jvm/hotspot/ui/tree/CStringTreeNodeAdapter.class
sun/jvm/hotspot/ui/tree/CTypeTreeNodeAdapter.class
sun/jvm/hotspot/ui/tree/DoubleTreeNodeAdapter.class
sun/jvm/hotspot/ui/tree/FieldTreeNodeAdapter.class
sun/jvm/hotspot/ui/tree/FloatTreeNodeAdapter.class
sun/jvm/hotspot/ui/tree/LongTreeNodeAdapter.class
sun/jvm/hotspot/ui/tree/MetadataTreeNodeAdapter.class
sun/jvm/hotspot/ui/tree/OopTreeNodeAdapter.class
sun/jvm/hotspot/ui/tree/RevPtrsTreeNodeAdapter.class
sun/jvm/hotspot/ui/tree/RootTreeNodeAdapter.class
sun/jvm/hotspot/ui/tree/SimpleTreeGroupNode.class
sun/jvm/hotspot/ui/tree/SimpleTreeModel.class
sun/jvm/hotspot/ui/tree/SimpleTreeNode.class
sun/jvm/hotspot/ui/treetable/AbstractTreeTableModel.class
sun/jvm/hotspot/ui/treetable/JTreeTable.class
sun/jvm/hotspot/ui/treetable/SimpleTreeTableModel.class
sun/jvm/hotspot/ui/treetable/TreeTableModel.class
sun/jvm/hotspot/ui/treetable/TreeTableModelAdapter.class
sun/jvm/hotspot/ui/VMFlagsPanel.class
sun/jvm/hotspot/ui/VMVersionInfoPanel.class
sun/jvm/hotspot/utilities/AbstractHeapGraphWriter.class
sun/jvm/hotspot/utilities/AddressOps.class
sun/jvm/hotspot/utilities/AltPlatformInfo.class
sun/jvm/hotspot/utilities/Assert.class
sun/jvm/hotspot/utilities/AssertionFailure.class
sun/jvm/hotspot/utilities/BasicHashtable.class
sun/jvm/hotspot/utilities/BasicHashtableEntry.class
sun/jvm/hotspot/utilities/BitMap.class
sun/jvm/hotspot/utilities/BitMapClosure.class
sun/jvm/hotspot/utilities/Bits.class
sun/jvm/hotspot/utilities/ConstantTag.class
sun/jvm/hotspot/utilities/ConstIterator.class
sun/jvm/hotspot/utilities/CPPExpressions.class
sun/jvm/hotspot/utilities/CStringUtilities.class
sun/jvm/hotspot/utilities/FindObjectByType.class
sun/jvm/hotspot/utilities/GenericArray.class
sun/jvm/hotspot/utilities/GenericGrowableArray.class
sun/jvm/hotspot/utilities/GrowableArray.class
sun/jvm/hotspot/utilities/Hashtable.class
sun/jvm/hotspot/utilities/HashtableBucket.class
sun/jvm/hotspot/utilities/HashtableEntry.class
sun/jvm/hotspot/utilities/HeapGraphWriter.class
sun/jvm/hotspot/utilities/HeapGXLWriter.class
sun/jvm/hotspot/utilities/HeapHprofBinWriter.class
sun/jvm/hotspot/utilities/HeapProgressThunk.class
sun/jvm/hotspot/utilities/IntArray.class
sun/jvm/hotspot/utilities/IntegerEnum.class
sun/jvm/hotspot/utilities/Interval.class
sun/jvm/hotspot/utilities/IntervalNode.class
sun/jvm/hotspot/utilities/IntervalTree.class
sun/jvm/hotspot/utilities/KlassArray.class
sun/jvm/hotspot/utilities/LivenessAnalysis.class
sun/jvm/hotspot/utilities/LivenessPath.class
sun/jvm/hotspot/utilities/LivenessPathElement.class
sun/jvm/hotspot/utilities/LivenessPathList.class
sun/jvm/hotspot/utilities/MarkBits.class
sun/jvm/hotspot/utilities/memo/MemoizedBoolean.class
sun/jvm/hotspot/utilities/memo/MemoizedByte.class
sun/jvm/hotspot/utilities/memo/MemoizedChar.class
sun/jvm/hotspot/utilities/memo/MemoizedDouble.class
sun/jvm/hotspot/utilities/memo/MemoizedFloat.class
sun/jvm/hotspot/utilities/memo/MemoizedInt.class
sun/jvm/hotspot/utilities/memo/MemoizedLong.class
sun/jvm/hotspot/utilities/memo/MemoizedObject.class
sun/jvm/hotspot/utilities/memo/MemoizedShort.class
sun/jvm/hotspot/utilities/MessageQueue.class
sun/jvm/hotspot/utilities/MessageQueueBackend.class
sun/jvm/hotspot/utilities/MethodArray.class
sun/jvm/hotspot/utilities/ObjectReader.class
sun/jvm/hotspot/utilities/PlatformInfo.class
sun/jvm/hotspot/utilities/PlatformInfoClosed.class
sun/jvm/hotspot/utilities/PointerFinder.class
sun/jvm/hotspot/utilities/PointerLocation.class
sun/jvm/hotspot/utilities/ProcImageClassLoader.class
sun/jvm/hotspot/utilities/ProgressiveHeapVisitor.class
sun/jvm/hotspot/utilities/RBColor.class
sun/jvm/hotspot/utilities/RBNode.class
sun/jvm/hotspot/utilities/RBTree.class
sun/jvm/hotspot/utilities/ReversePtrs.class
sun/jvm/hotspot/utilities/ReversePtrsAnalysis.class
sun/jvm/hotspot/utilities/RobustOopDeterminator.class
sun/jvm/hotspot/utilities/soql/Callable.class
sun/jvm/hotspot/utilities/soql/DefaultScriptObject.class
sun/jvm/hotspot/utilities/soql/InvocableCallable.class
sun/jvm/hotspot/utilities/soql/JSJavaArray.class
sun/jvm/hotspot/utilities/soql/JSJavaArrayKlass.class
sun/jvm/hotspot/utilities/soql/JSJavaClass.class
sun/jvm/hotspot/utilities/soql/JSJavaFactory.class
sun/jvm/hotspot/utilities/soql/JSJavaFactoryImpl.class
sun/jvm/hotspot/utilities/soql/JSJavaField.class
sun/jvm/hotspot/utilities/soql/JSJavaFrame.class
sun/jvm/hotspot/utilities/soql/JSJavaHeap.class
sun/jvm/hotspot/utilities/soql/JSJavaInstance.class
sun/jvm/hotspot/utilities/soql/JSJavaInstanceKlass.class
sun/jvm/hotspot/utilities/soql/JSJavaKlass.class
sun/jvm/hotspot/utilities/soql/JSJavaMethod.class
sun/jvm/hotspot/utilities/soql/JSJavaObjArray.class
sun/jvm/hotspot/utilities/soql/JSJavaObjArrayKlass.class
sun/jvm/hotspot/utilities/soql/JSJavaObject.class
sun/jvm/hotspot/utilities/soql/JSJavaScriptEngine.class
sun/jvm/hotspot/utilities/soql/JSJavaString.class
sun/jvm/hotspot/utilities/soql/JSJavaThread.class
sun/jvm/hotspot/utilities/soql/JSJavaTypeArray.class
sun/jvm/hotspot/utilities/soql/JSJavaTypeArrayKlass.class
sun/jvm/hotspot/utilities/soql/JSJavaVM.class
sun/jvm/hotspot/utilities/soql/JSList.class
sun/jvm/hotspot/utilities/soql/JSMap.class
sun/jvm/hotspot/utilities/soql/JSMetadata.class
sun/jvm/hotspot/utilities/soql/MapScriptObject.class
sun/jvm/hotspot/utilities/soql/MethodCallable.class
sun/jvm/hotspot/utilities/soql/ObjectVisitor.class
sun/jvm/hotspot/utilities/soql/ScriptObject.class
sun/jvm/hotspot/utilities/soql/SOQLEngine.class
sun/jvm/hotspot/utilities/soql/SOQLException.class
sun/jvm/hotspot/utilities/soql/SOQLQuery.class
sun/jvm/hotspot/utilities/StreamMonitor.class
sun/jvm/hotspot/utilities/SystemDictionaryHelper.class
sun/jvm/hotspot/utilities/TwoOopHashtable.class
sun/jvm/hotspot/utilities/U1Array.class
sun/jvm/hotspot/utilities/U2Array.class
sun/jvm/hotspot/utilities/UnsupportedPlatformException.class
sun/jvm/hotspot/utilities/WorkerThread.class
sun/jvm/hotspot/Win32VtblAccess.class
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