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).
... 

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/jdi/LongValueImpl.class
sun/jvm/hotspot/jdi/MethodImpl.class
sun/jvm/hotspot/jdi/MirrorImpl.class
sun/jvm/hotspot/jdi/MonitorInfoImpl.class
sun/jvm/hotspot/jdi/NonConcreteMethodImpl.class
sun/jvm/hotspot/jdi/ObjectReferenceImpl.class
sun/jvm/hotspot/jdi/PrimitiveTypeImpl.class
sun/jvm/hotspot/jdi/PrimitiveValueImpl.class
sun/jvm/hotspot/jdi/ReferenceTypeImpl.class
sun/jvm/hotspot/jdi/SACoreAttachingConnector.class
sun/jvm/hotspot/jdi/SADebugServer.class
sun/jvm/hotspot/jdi/SADebugServerAttachingConnector.class
sun/jvm/hotspot/jdi/SAJDIClassLoader.class
sun/jvm/hotspot/jdi/SAPIDAttachingConnector.class
sun/jvm/hotspot/jdi/SDE.class
sun/jvm/hotspot/jdi/ShortTypeImpl.class
sun/jvm/hotspot/jdi/ShortValueImpl.class
sun/jvm/hotspot/jdi/StackFrameImpl.class
sun/jvm/hotspot/jdi/StratumLineInfo.class
sun/jvm/hotspot/jdi/StringReferenceImpl.class
sun/jvm/hotspot/jdi/ThreadGroupReferenceImpl.class
sun/jvm/hotspot/jdi/ThreadReferenceImpl.class
sun/jvm/hotspot/jdi/TypeComponentImpl.class
sun/jvm/hotspot/jdi/TypeImpl.class
sun/jvm/hotspot/jdi/ValueContainer.class
sun/jvm/hotspot/jdi/ValueImpl.class
sun/jvm/hotspot/jdi/VirtualMachineImpl.class
sun/jvm/hotspot/jdi/VMModifiers.class
sun/jvm/hotspot/jdi/VoidTypeImpl.class
sun/jvm/hotspot/jdi/VoidValueImpl.class
sun/jvm/hotspot/LinuxVtblAccess.class
sun/jvm/hotspot/memory/AdaptiveFreeList.class
sun/jvm/hotspot/memory/AFLBinaryTreeDictionary.class
sun/jvm/hotspot/memory/CardGeneration.class
sun/jvm/hotspot/memory/CMSBitMap.class
sun/jvm/hotspot/memory/CMSCollector.class
sun/jvm/hotspot/memory/CodeHeap.class
sun/jvm/hotspot/memory/CompactibleFreeListSpace.class
sun/jvm/hotspot/memory/CompactibleSpace.class
sun/jvm/hotspot/memory/ConcurrentMarkSweepGeneration.class
sun/jvm/hotspot/memory/ContiguousSpace.class
sun/jvm/hotspot/memory/DefNewGeneration.class
sun/jvm/hotspot/memory/Dictionary.class
sun/jvm/hotspot/memory/DictionaryEntry.class
sun/jvm/hotspot/memory/EdenSpace.class
sun/jvm/hotspot/memory/FreeChunk.class
sun/jvm/hotspot/memory/GenCollectedHeap.class
sun/jvm/hotspot/memory/Generation.class
sun/jvm/hotspot/memory/GenerationFactory.class
sun/jvm/hotspot/memory/GenerationIsInClosure.class
sun/jvm/hotspot/memory/GenerationSpec.class
sun/jvm/hotspot/memory/HeapBlock.class
sun/jvm/hotspot/memory/LinearAllocBlock.class
sun/jvm/hotspot/memory/LoaderConstraintEntry.class
sun/jvm/hotspot/memory/LoaderConstraintTable.class
sun/jvm/hotspot/memory/MemRegion.class
sun/jvm/hotspot/memory/OffsetTableContigSpace.class
sun/jvm/hotspot/memory/OneContigSpaceCardGeneration.class
sun/jvm/hotspot/memory/ParNewGeneration.class
sun/jvm/hotspot/memory/PlaceholderEntry.class
sun/jvm/hotspot/memory/PlaceholderTable.class
sun/jvm/hotspot/memory/ProtectionDomainCacheEntry.class
sun/jvm/hotspot/memory/ProtectionDomainEntry.class
sun/jvm/hotspot/memory/SharedHeap.class
sun/jvm/hotspot/memory/Space.class
sun/jvm/hotspot/memory/SpaceClosure.class
sun/jvm/hotspot/memory/StringTable.class
sun/jvm/hotspot/memory/SymbolTable.class
sun/jvm/hotspot/memory/SystemDictionary.class
sun/jvm/hotspot/memory/TenuredGeneration.class
sun/jvm/hotspot/memory/TenuredSpace.class
sun/jvm/hotspot/memory/Universe.class
sun/jvm/hotspot/ObjectHistogram.class
sun/jvm/hotspot/oops/AccessFlags.class
sun/jvm/hotspot/oops/Array.class
sun/jvm/hotspot/oops/ArrayData.class
sun/jvm/hotspot/oops/ArrayKlass.class
sun/jvm/hotspot/oops/BitData.class
sun/jvm/hotspot/oops/BooleanField.class
sun/jvm/hotspot/oops/BranchData.class
sun/jvm/hotspot/oops/BreakpointInfo.class
sun/jvm/hotspot/oops/ByteField.class
sun/jvm/hotspot/oops/CellTypeState.class
sun/jvm/hotspot/oops/CellTypeStateList.class
sun/jvm/hotspot/oops/CharField.class
sun/jvm/hotspot/oops/CheckedExceptionElement.class
sun/jvm/hotspot/oops/CIntField.class
sun/jvm/hotspot/oops/CompiledICHolder.class
sun/jvm/hotspot/oops/CompressedLineNumberReadStream.class
sun/jvm/hotspot/oops/ConstantPool.class
sun/jvm/hotspot/oops/ConstantPoolCache.class
sun/jvm/hotspot/oops/ConstantPoolCacheEntry.class
sun/jvm/hotspot/oops/ConstMethod.class
sun/jvm/hotspot/oops/CounterData.class
sun/jvm/hotspot/oops/DataLayout.class
sun/jvm/hotspot/oops/DefaultHeapVisitor.class
sun/jvm/hotspot/oops/DefaultMetadataVisitor.class
sun/jvm/hotspot/oops/DefaultOopVisitor.class
sun/jvm/hotspot/oops/DoubleField.class
sun/jvm/hotspot/oops/ExceptionTableElement.class
sun/jvm/hotspot/oops/Field.class
sun/jvm/hotspot/oops/FieldIdentifier.class
sun/jvm/hotspot/oops/FieldType.class
sun/jvm/hotspot/oops/FieldVisitor.class
sun/jvm/hotspot/oops/FloatField.class
sun/jvm/hotspot/oops/GenerateOopMap.class
sun/jvm/hotspot/oops/HeapPrinter.class
sun/jvm/hotspot/oops/HeapVisitor.class
sun/jvm/hotspot/oops/IndexableFieldIdentifier.class
sun/jvm/hotspot/oops/Instance.class
sun/jvm/hotspot/oops/InstanceClassLoaderKlass.class
sun/jvm/hotspot/oops/InstanceKlass.class
sun/jvm/hotspot/oops/InstanceMirrorKlass.class
sun/jvm/hotspot/oops/InstanceRefKlass.class
sun/jvm/hotspot/oops/IntField.class
sun/jvm/hotspot/oops/java_lang_Class.class
sun/jvm/hotspot/oops/JumpData.class
sun/jvm/hotspot/oops/JVMDIClassStatus.class
sun/jvm/hotspot/oops/Klass.class
sun/jvm/hotspot/oops/LineNumberTableElement.class
sun/jvm/hotspot/oops/LocalVariableTableElement.class
sun/jvm/hotspot/oops/LongField.class
sun/jvm/hotspot/oops/Mark.class
sun/jvm/hotspot/oops/Metadata.class
sun/jvm/hotspot/oops/MetadataField.class
sun/jvm/hotspot/oops/MetadataVisitor.class
sun/jvm/hotspot/oops/Method.class
sun/jvm/hotspot/oops/MethodCounters.class
sun/jvm/hotspot/oops/MethodData.class
sun/jvm/hotspot/oops/MultiBranchData.class
sun/jvm/hotspot/oops/MutationException.class
sun/jvm/hotspot/oops/NamedFieldIdentifier.class
sun/jvm/hotspot/oops/NarrowKlassField.class
sun/jvm/hotspot/oops/NarrowOopField.class
sun/jvm/hotspot/oops/ObjArray.class
sun/jvm/hotspot/oops/ObjArrayKlass.class
sun/jvm/hotspot/oops/ObjectHeap.class
sun/jvm/hotspot/oops/ObjectHistogram.class
sun/jvm/hotspot/oops/ObjectHistogramElement.class
sun/jvm/hotspot/oops/Oop.class
sun/jvm/hotspot/oops/OopField.class
sun/jvm/hotspot/oops/OopPrinter.class
sun/jvm/hotspot/oops/OopUtilities.class
sun/jvm/hotspot/oops/OopVisitor.class
sun/jvm/hotspot/oops/ProfileData.class
sun/jvm/hotspot/oops/RawHeapVisitor.class
sun/jvm/hotspot/oops/ReceiverTypeData.class
sun/jvm/hotspot/oops/RetData.class
sun/jvm/hotspot/oops/ShortField.class
sun/jvm/hotspot/oops/Symbol.class
sun/jvm/hotspot/oops/TypeArray.class
sun/jvm/hotspot/oops/TypeArrayKlass.class
sun/jvm/hotspot/oops/UnknownOopException.class
sun/jvm/hotspot/oops/VirtualCallData.class
sun/jvm/hotspot/opto/Block.class
sun/jvm/hotspot/opto/Block_Array.class
sun/jvm/hotspot/opto/Block_List.class
sun/jvm/hotspot/opto/CallDynamicJavaNode.class
sun/jvm/hotspot/opto/CallJavaNode.class
sun/jvm/hotspot/opto/CallNode.class
sun/jvm/hotspot/opto/CallRuntimeNode.class
sun/jvm/hotspot/opto/CallStaticJavaNode.class
sun/jvm/hotspot/opto/Compile.class
sun/jvm/hotspot/opto/CompilerPhaseType.class
sun/jvm/hotspot/opto/HaltNode.class
sun/jvm/hotspot/opto/InlineTree.class
sun/jvm/hotspot/opto/JVMState.class
sun/jvm/hotspot/opto/LoopNode.class
sun/jvm/hotspot/opto/MachCallJavaNode.class
sun/jvm/hotspot/opto/MachCallNode.class
sun/jvm/hotspot/opto/MachCallRuntimeNode.class
sun/jvm/hotspot/opto/MachCallStaticJavaNode.class
sun/jvm/hotspot/opto/MachIfNode.class
sun/jvm/hotspot/opto/MachNode.class
sun/jvm/hotspot/opto/MachReturnNode.class
sun/jvm/hotspot/opto/MachSafePointNode.class
sun/jvm/hotspot/opto/MultiNode.class
sun/jvm/hotspot/opto/Node.class
sun/jvm/hotspot/opto/Node_Array.class
sun/jvm/hotspot/opto/Node_List.class
sun/jvm/hotspot/opto/Phase.class
sun/jvm/hotspot/opto/PhaseCFG.class
sun/jvm/hotspot/opto/PhaseRegAlloc.class
sun/jvm/hotspot/opto/PhiNode.class
sun/jvm/hotspot/opto/ProjNode.class
sun/jvm/hotspot/opto/RegionNode.class
sun/jvm/hotspot/opto/RootNode.class
sun/jvm/hotspot/opto/SafePointNode.class
sun/jvm/hotspot/opto/TypeNode.class
sun/jvm/hotspot/prims/JvmtiExport.class
sun/jvm/hotspot/RMIHelper.class
sun/jvm/hotspot/runtime/AddressVisitor.class
sun/jvm/hotspot/runtime/amd64/AMD64CurrentFrameGuess.class
sun/jvm/hotspot/runtime/amd64/AMD64JavaCallWrapper.class
sun/jvm/hotspot/runtime/ArgumentOopFinder.class
sun/jvm/hotspot/runtime/Arguments.class
sun/jvm/hotspot/runtime/ArgumentSizeComputer.class
sun/jvm/hotspot/runtime/arm/ARMCurrentFrameGuess.class
sun/jvm/hotspot/runtime/arm/ARMFrame.class
sun/jvm/hotspot/runtime/arm/ARMJavaCallWrapper.class
sun/jvm/hotspot/runtime/arm/ARMRegisterMap.class
sun/jvm/hotspot/runtime/BasicLock.class
sun/jvm/hotspot/runtime/BasicObjectLock.class
sun/jvm/hotspot/runtime/BasicType.class
sun/jvm/hotspot/runtime/BasicTypeSize.class
sun/jvm/hotspot/runtime/bsd/BsdSignals.class
sun/jvm/hotspot/runtime/bsd_amd64/BsdAMD64JavaThreadPDAccess.class
sun/jvm/hotspot/runtime/bsd_x86/BsdSignals.class
sun/jvm/hotspot/runtime/bsd_x86/BsdX86JavaThreadPDAccess.class
sun/jvm/hotspot/runtime/Bytes.class
sun/jvm/hotspot/runtime/ClassConstants.class
sun/jvm/hotspot/runtime/CompiledVFrame.class
sun/jvm/hotspot/runtime/CompilerThread.class
sun/jvm/hotspot/runtime/ConcurrentLocksPrinter.class
sun/jvm/hotspot/runtime/ConstructionException.class
sun/jvm/hotspot/runtime/DeadlockDetector.class
sun/jvm/hotspot/runtime/ExternalVFrame.class
sun/jvm/hotspot/runtime/Flags.class
sun/jvm/hotspot/runtime/Frame.class
sun/jvm/hotspot/runtime/InstanceConstructor.class
sun/jvm/hotspot/runtime/InterpretedVFrame.class
sun/jvm/hotspot/runtime/InterpreterFrameClosure.class
sun/jvm/hotspot/runtime/JavaCallWrapper.class
sun/jvm/hotspot/runtime/JavaThread.class
sun/jvm/hotspot/runtime/JavaThreadFactory.class
sun/jvm/hotspot/runtime/JavaThreadPDAccess.class
sun/jvm/hotspot/runtime/JavaThreadState.class
sun/jvm/hotspot/runtime/JavaVFrame.class
sun/jvm/hotspot/runtime/JNIHandleBlock.class
sun/jvm/hotspot/runtime/JNIHandles.class
sun/jvm/hotspot/runtime/JNIid.class
sun/jvm/hotspot/runtime/JvmtiAgentThread.class
sun/jvm/hotspot/runtime/linux/LinuxSignals.class
sun/jvm/hotspot/runtime/linux_aarch64/LinuxAARCH64JavaThreadPDAccess.class
sun/jvm/hotspot/runtime/linux_amd64/LinuxAMD64JavaThreadPDAccess.class
sun/jvm/hotspot/runtime/linux_arm/LinuxARMJavaThreadPDAccess.class
sun/jvm/hotspot/runtime/linux_ppc/LinuxPPCJavaThreadPDAccess.class
sun/jvm/hotspot/runtime/linux_sparc/LinuxSPARCJavaThreadPDAccess.class
sun/jvm/hotspot/runtime/linux_x86/LinuxSignals.class
sun/jvm/hotspot/runtime/linux_x86/LinuxX86JavaThreadPDAccess.class
sun/jvm/hotspot/runtime/MonitorInfo.class
sun/jvm/hotspot/runtime/NativeSignatureIterator.class
sun/jvm/hotspot/runtime/ObjectMonitor.class
sun/jvm/hotspot/runtime/ObjectSynchronizer.class
sun/jvm/hotspot/runtime/OSThread.class
sun/jvm/hotspot/runtime/PerfDataEntry.class
sun/jvm/hotspot/runtime/PerfDataPrologue.class
sun/jvm/hotspot/runtime/PerfMemory.class
sun/jvm/hotspot/runtime/posix/POSIXSignals.class
sun/jvm/hotspot/runtime/ppc/PPCCurrentFrameGuess.class
sun/jvm/hotspot/runtime/ppc/PPCFrame.class
sun/jvm/hotspot/runtime/ppc/PPCJavaCallWrapper.class
sun/jvm/hotspot/runtime/ppc/PPCRegisterMap.class
sun/jvm/hotspot/runtime/RegisterMap.class
sun/jvm/hotspot/runtime/ResultTypeFinder.class
sun/jvm/hotspot/runtime/ServiceThread.class
sun/jvm/hotspot/runtime/SignatureConverter.class
sun/jvm/hotspot/runtime/SignatureInfo.class
sun/jvm/hotspot/runtime/SignatureIterator.class
sun/jvm/hotspot/runtime/solaris_amd64/SolarisAMD64JavaThreadPDAccess.class
sun/jvm/hotspot/runtime/solaris_sparc/SolarisSPARCJavaThreadPDAccess.class
sun/jvm/hotspot/runtime/solaris_x86/SolarisX86JavaThreadPDAccess.class
sun/jvm/hotspot/runtime/sparc/SPARCFrame.class
sun/jvm/hotspot/runtime/sparc/SPARCRegisterMap.class
sun/jvm/hotspot/runtime/StackFrameStream.class
sun/jvm/hotspot/runtime/StackValue.class
sun/jvm/hotspot/runtime/StackValueCollection.class
sun/jvm/hotspot/runtime/StaticBaseConstructor.class
sun/jvm/hotspot/runtime/StubRoutines.class
sun/jvm/hotspot/runtime/Thread.class
sun/jvm/hotspot/runtime/ThreadLocalAllocBuffer.class
sun/jvm/hotspot/runtime/Threads.class
sun/jvm/hotspot/runtime/VFrame.class
sun/jvm/hotspot/runtime/VirtualBaseConstructor.class
sun/jvm/hotspot/runtime/VirtualConstructor.class
sun/jvm/hotspot/runtime/VirtualSpace.class
sun/jvm/hotspot/runtime/VM.class
sun/jvm/hotspot/runtime/VMObject.class
sun/jvm/hotspot/runtime/VMObjectFactory.class
sun/jvm/hotspot/runtime/VMOps.class
sun/jvm/hotspot/runtime/VMReg.class
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⇒ JDK 8 tools.jar - JDK Tools

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⇑ Download and Use JDK 8

⇑⇑ FAQ for JDK (Java Development Kit)