JRE 8 rt.jar is the JAR file for JRE 8 RT (Runtime) libraries. JRE (Java Runtime) 8 is the runtime environment included in JDK 8. JRE 8 rt.jar libraries are divided into 6 packages:

com.* - Internal Oracle and Sun Microsystems libraries
java.* - Standard Java API libraries.
javax.* - Extended Java API libraries.
jdk.* -  JDK supporting libraries.
org.* - Third party libraries.
sun.* - Old libraries developed by Sun Microsystems.

JAR File Information:

Directory of C:\fyicenter\jdk-1.8.0_191\jre\lib
      63,596,151 rt.jar

Here is the list of Java classes of the com.* package in JRE 1.8.0_191 rt.jar. Java source codes are also provided.

⏎ com/sun/corba/se/impl/io/IIOPOutputStream.java

/*
 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */
/*
 * Licensed Materials - Property of IBM
 * RMI-IIOP v1.0
 * Copyright IBM Corp. 1998 1999  All Rights Reserved
 *
 */

package com.sun.corba.se.impl.io;

import org.omg.CORBA.INTERNAL;
import org.omg.CORBA.portable.OutputStream;

import java.security.AccessController ;
import java.security.PrivilegedAction ;

import java.io.IOException;
import java.io.DataOutputStream;
import java.io.Serializable;
import java.io.InvalidClassException;
import java.io.StreamCorruptedException;
import java.io.Externalizable;
import java.io.ObjectStreamException;
import java.io.NotSerializableException;
import java.io.NotActiveException;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Field;

import java.util.Stack;

import javax.rmi.CORBA.Util;
import javax.rmi.CORBA.ValueHandlerMultiFormat;

import sun.corba.Bridge ;

import com.sun.corba.se.impl.io.ObjectStreamClass;
import com.sun.corba.se.impl.util.Utility;
import com.sun.corba.se.impl.util.RepositoryId;

import com.sun.corba.se.spi.logging.CORBALogDomains ;
import com.sun.corba.se.impl.logging.UtilSystemException ;

/**
 * IIOPOutputStream is ...
 *
 * @author  Stephen Lewallen
 * @since   JDK1.1.6
 */

public class IIOPOutputStream
    extends com.sun.corba.se.impl.io.OutputStreamHook
{
    private UtilSystemException wrapper = UtilSystemException.get(
        CORBALogDomains.RPC_ENCODING ) ;

    private static Bridge bridge =
        (Bridge)AccessController.doPrivileged(
            new PrivilegedAction() {
                public Object run() {
                    return Bridge.get() ;
                }
            }
        ) ;

    private org.omg.CORBA_2_3.portable.OutputStream orbStream;

    private Object currentObject = null;

    private ObjectStreamClass currentClassDesc = null;

    private int recursionDepth = 0;

    private int simpleWriteDepth = 0;

    private IOException abortIOException = null;

    private java.util.Stack classDescStack = new java.util.Stack();

    // Used when calling an object's writeObject method
    private Object[] writeObjectArgList = {this};

    public IIOPOutputStream()
        throws java.io.IOException
   {
        super();
    }

    // If using RMI-IIOP stream format version 2, this tells
    // the ORB stream (which must be a ValueOutputStream) to
    // begin a new valuetype to contain the optional data
    // of the writeObject method.
    protected void beginOptionalCustomData() {

        if (streamFormatVersion == 2) {

            org.omg.CORBA.portable.ValueOutputStream vout
                = (org.omg.CORBA.portable.ValueOutputStream)orbStream;

            vout.start_value(currentClassDesc.getRMIIIOPOptionalDataRepId());
        }
    }

    final void setOrbStream(org.omg.CORBA_2_3.portable.OutputStream os) {
        orbStream = os;
    }

    final org.omg.CORBA_2_3.portable.OutputStream getOrbStream() {
        return orbStream;
    }

    final void increaseRecursionDepth(){
        recursionDepth++;
    }

    final int decreaseRecursionDepth(){
        return --recursionDepth;
    }

    /**
     * Override the actions of the final method "writeObject()"
     * in ObjectOutputStream.
     * @since     JDK1.1.6
     */
    public final void writeObjectOverride(Object obj)
        throws IOException
    {
        writeObjectState.writeData(this);

        Util.writeAbstractObject((OutputStream)orbStream, obj);
    }

    /**
     * Override the actions of the final method "writeObject()"
     * in ObjectOutputStream.
     * @since     JDK1.1.6
     */
    public final void simpleWriteObject(Object obj, byte formatVersion)
    /* throws IOException */
    {
        byte oldStreamFormatVersion = streamFormatVersion;

        streamFormatVersion = formatVersion;

        Object prevObject = currentObject;
        ObjectStreamClass prevClassDesc = currentClassDesc;
        simpleWriteDepth++;

        try {
            // if (!checkSpecialClasses(obj) && !checkSubstitutableSpecialClasses(obj))
            outputObject(obj);

        } catch (IOException ee) {
            if (abortIOException == null)
                abortIOException = ee;
        } finally {
            /* Restore state of previous call incase this is a nested call */
            streamFormatVersion = oldStreamFormatVersion;
            simpleWriteDepth--;
            currentObject = prevObject;
            currentClassDesc = prevClassDesc;
        }

        /* If the recursion depth is 0, test for and clear the pending exception.
         * If there is a pending exception throw it.
         */
        IOException pending = abortIOException;
        if (simpleWriteDepth == 0)
            abortIOException = null;
        if (pending != null) {
            bridge.throwException( pending ) ;
        }
    }

    // Required by the superclass.
    ObjectStreamField[] getFieldsNoCopy() {
        return currentClassDesc.getFieldsNoCopy();
    }

    /**
     * Override the actions of the final method "defaultWriteObject()"
     * in ObjectOutputStream.
     * @since     JDK1.1.6
     */
    public final void defaultWriteObjectDelegate()
    /* throws IOException */
    {
        try {
            if (currentObject == null || currentClassDesc == null)
                // XXX I18N, Logging needed.
                throw new NotActiveException("defaultWriteObjectDelegate");

            ObjectStreamField[] fields =
                currentClassDesc.getFieldsNoCopy();
            if (fields.length > 0) {
                outputClassFields(currentObject, currentClassDesc.forClass(),
                                  fields);
            }
        } catch(IOException ioe) {
            bridge.throwException(ioe);
        }
    }

    /**
     * Override the actions of the final method "enableReplaceObject()"
     * in ObjectOutputStream.
     * @since     JDK1.1.6
     */
    public final boolean enableReplaceObjectDelegate(boolean enable)
    /* throws SecurityException */
    {
        return false;

    }


    protected final void annotateClass(Class<?> cl) throws IOException{
        // XXX I18N, Logging needed.
        throw new IOException("Method annotateClass not supported");
    }

    public final void close() throws IOException{
        // no op
    }

    protected final void drain() throws IOException{
        // no op
    }

    public final void flush() throws IOException{
        try{
            orbStream.flush();
        } catch(Error e) {
            IOException ioexc = new IOException(e.getMessage());
            ioexc.initCause(e) ;
            throw ioexc ;
        }
    }

    protected final Object replaceObject(Object obj) throws IOException{
        // XXX I18N, Logging needed.
        throw new IOException("Method replaceObject not supported");
    }

    /**
     * Reset will disregard the state of any objects already written
     * to the stream.  The state is reset to be the same as a new
     * ObjectOutputStream.  The current point in the stream is marked
     * as reset so the corresponding ObjectInputStream will be reset
     * at the same point.  Objects previously written to the stream
     * will not be refered to as already being in the stream.  They
     * will be written to the stream again.
     * @since     JDK1.1
     */
    public final void reset() throws IOException{
        try{
            //orbStream.reset();

            if (currentObject != null || currentClassDesc != null)
                // XXX I18N, Logging needed.
                throw new IOException("Illegal call to reset");

            abortIOException = null;

            if (classDescStack == null)
                classDescStack = new java.util.Stack();
            else
                classDescStack.setSize(0);

        } catch(Error e) {
            IOException ioexc = new IOException(e.getMessage());
            ioexc.initCause(e) ;
            throw ioexc ;
        }
    }

    public final void write(byte b[]) throws IOException{
        try{
            writeObjectState.writeData(this);

            orbStream.write_octet_array(b, 0, b.length);
        } catch(Error e) {
            IOException ioexc = new IOException(e.getMessage());
            ioexc.initCause(e) ;
            throw ioexc ;
        }
    }

    public final void write(byte b[], int off, int len) throws IOException{
        try{
            writeObjectState.writeData(this);

            orbStream.write_octet_array(b, off, len);
        } catch(Error e) {
            IOException ioexc = new IOException(e.getMessage());
            ioexc.initCause(e) ;
            throw ioexc ;
        }
    }

    public final void write(int data) throws IOException{
        try{
            writeObjectState.writeData(this);

            orbStream.write_octet((byte)(data & 0xFF));
        } catch(Error e) {
            IOException ioexc = new IOException(e.getMessage());
            ioexc.initCause(e) ;
            throw ioexc ;
        }
    }

    public final void writeBoolean(boolean data) throws IOException{
        try{
            writeObjectState.writeData(this);

            orbStream.write_boolean(data);
        } catch(Error e) {
            IOException ioexc = new IOException(e.getMessage());
            ioexc.initCause(e) ;
            throw ioexc ;
        }
    }

    public final void writeByte(int data) throws IOException{
        try{
            writeObjectState.writeData(this);

            orbStream.write_octet((byte)data);
        } catch(Error e) {
            IOException ioexc = new IOException(e.getMessage());
            ioexc.initCause(e) ;
            throw ioexc ;
        }
    }

    public final void writeBytes(String data) throws IOException{
        try{
            writeObjectState.writeData(this);

            byte buf[] = data.getBytes();
            orbStream.write_octet_array(buf, 0, buf.length);
        } catch(Error e) {
            IOException ioexc = new IOException(e.getMessage());
            ioexc.initCause(e) ;
            throw ioexc ;
        }
    }

    public final void writeChar(int data) throws IOException{
        try{
            writeObjectState.writeData(this);

            orbStream.write_wchar((char)data);
        } catch(Error e) {
            IOException ioexc = new IOException(e.getMessage());
            ioexc.initCause(e) ;
            throw ioexc ;
        }
    }

    public final void writeChars(String data) throws IOException{
        try{
            writeObjectState.writeData(this);

            char buf[] = data.toCharArray();
            orbStream.write_wchar_array(buf, 0, buf.length);
        } catch(Error e) {
            IOException ioexc = new IOException(e.getMessage());
            ioexc.initCause(e) ;
            throw ioexc ;
        }
    }

    public final void writeDouble(double data) throws IOException{
        try{
            writeObjectState.writeData(this);

            orbStream.write_double(data);
        } catch(Error e) {
            IOException ioexc = new IOException(e.getMessage());
            ioexc.initCause(e) ;
            throw ioexc ;
        }
    }

    public final void writeFloat(float data) throws IOException{
        try{
            writeObjectState.writeData(this);

            orbStream.write_float(data);
        } catch(Error e) {
            IOException ioexc = new IOException(e.getMessage());
            ioexc.initCause(e) ;
            throw ioexc ;
        }
    }

    public final void writeInt(int data) throws IOException{
        try{
            writeObjectState.writeData(this);

            orbStream.write_long(data);
        } catch(Error e) {
            IOException ioexc = new IOException(e.getMessage());
            ioexc.initCause(e) ;
            throw ioexc ;
        }
    }

    public final void writeLong(long data) throws IOException{
        try{
            writeObjectState.writeData(this);

            orbStream.write_longlong(data);
        } catch(Error e) {
            IOException ioexc = new IOException(e.getMessage());
            ioexc.initCause(e) ;
            throw ioexc ;
        }
    }

    public final void writeShort(int data) throws IOException{
        try{
            writeObjectState.writeData(this);

            orbStream.write_short((short)data);
        } catch(Error e) {
            IOException ioexc = new IOException(e.getMessage());
            ioexc.initCause(e) ;
            throw ioexc ;
        }
    }

    protected final void writeStreamHeader() throws IOException{
        // no op
    }

    /**
     * Helper method for correcting the Kestrel bug 4367783 (dealing
     * with larger than 8-bit chars).  The old behavior is preserved
     * in orbutil.IIOPInputStream_1_3 in order to interoperate with
     * our legacy ORBs.
     */
    protected void internalWriteUTF(org.omg.CORBA.portable.OutputStream stream,
                                    String data)
    {
        stream.write_wstring(data);
    }

    public final void writeUTF(String data) throws IOException{
        try{
            writeObjectState.writeData(this);

            internalWriteUTF(orbStream, data);
        } catch(Error e) {
            IOException ioexc = new IOException(e.getMessage());
            ioexc.initCause(e) ;
            throw ioexc ;
        }
    }

    // INTERNAL UTILITY METHODS
    /*
     * Check for special cases of serializing objects.
     * These objects are not subject to replacement.
     */
    private boolean checkSpecialClasses(Object obj) throws IOException {

        /*
         * If this is a class, don't allow substitution
         */
        //if (obj instanceof Class) {
        //    throw new IOException("Serialization of Class not supported");
        //}

        if (obj instanceof ObjectStreamClass) {
            // XXX I18N, Logging needed.
            throw new IOException("Serialization of ObjectStreamClass not supported");
        }

        return false;
    }

    /*
     * Check for special cases of substitutable serializing objects.
     * These classes are replaceable.
     */
    private boolean checkSubstitutableSpecialClasses(Object obj)
        throws IOException
    {
        if (obj instanceof String) {
            orbStream.write_value((java.io.Serializable)obj);
            return true;
        }

        //if (obj.getClass().isArray()) {
        //    outputArray(obj);
        //    return true;
        //}

        return false;
    }

    /*
     * Write out the object
     */
    private void outputObject(final Object obj) throws IOException{

        currentObject = obj;
        Class currclass = obj.getClass();

        /* Get the Class descriptor for this class,
         * Throw a NotSerializableException if there is none.
         */
        currentClassDesc = ObjectStreamClass.lookup(currclass);
        if (currentClassDesc == null) {
            // XXX I18N, Logging needed.
            throw new NotSerializableException(currclass.getName());
        }

        /* If the object is externalizable,
         * call writeExternal.
         * else do Serializable processing.
         */
        if (currentClassDesc.isExternalizable()) {
            // Write format version
            orbStream.write_octet(streamFormatVersion);

            Externalizable ext = (Externalizable)obj;
            ext.writeExternal(this);

        } else {

            /* The object's classes should be processed from supertype to subtype
             * Push all the clases of the current object onto a stack.
             * Remember the stack pointer where this set of classes is being pushed.
             */
            if (currentClassDesc.forClass().getName().equals("java.lang.String")) {
                    this.writeUTF((String)obj);
                    return;
            }
            int stackMark = classDescStack.size();
            try {
                ObjectStreamClass next;
                while ((next = currentClassDesc.getSuperclass()) != null) {
                    classDescStack.push(currentClassDesc);
                    currentClassDesc = next;
                }

                /*
                 * For currentClassDesc and all the pushed class descriptors
                 *    If the class is writing its own data
                 *                set blockData = true; call the class writeObject method
                 *    If not
                 *     invoke either the defaultWriteObject method.
                 */
                do {

                    WriteObjectState oldState = writeObjectState;

                    try {

                        setState(NOT_IN_WRITE_OBJECT);

                        if (currentClassDesc.hasWriteObject()) {
                            invokeObjectWriter(currentClassDesc, obj );
                        } else {
                            defaultWriteObjectDelegate();
                        }
                    } finally {
                        setState(oldState);
                    }

                } while (classDescStack.size() > stackMark &&
                         (currentClassDesc = (ObjectStreamClass)classDescStack.pop()) != null);
            } finally {
                classDescStack.setSize(stackMark);
            }
        }
    }

    /*
     * Invoke writer.
     * _REVISIT_ invokeObjectWriter and invokeObjectReader behave inconsistently with each other since
     * the reader returns a boolean...fix later
     */
    private void invokeObjectWriter(ObjectStreamClass osc, Object obj)
        throws IOException
    {
        Class c = osc.forClass() ;

        try {

            // Write format version
            orbStream.write_octet(streamFormatVersion);

            writeObjectState.enterWriteObject(this);

            // writeObject(obj, c, this);
            osc.writeObjectMethod.invoke( obj, writeObjectArgList ) ;

            writeObjectState.exitWriteObject(this);

        } catch (InvocationTargetException e) {
            Throwable t = e.getTargetException();
            if (t instanceof IOException)
                throw (IOException)t;
            else if (t instanceof RuntimeException)
                throw (RuntimeException) t;
            else if (t instanceof Error)
                throw (Error) t;
            else
                // XXX I18N, Logging needed.
                throw new Error("invokeObjectWriter internal error",e);
        } catch (IllegalAccessException e) {
            // cannot happen
        }
    }

    void writeField(ObjectStreamField field, Object value) throws IOException {
        switch (field.getTypeCode()) {
            case 'B':
                if (value == null)
                    orbStream.write_octet((byte)0);
                else
                    orbStream.write_octet(((Byte)value).byteValue());
                break;
            case 'C':
                if (value == null)
                    orbStream.write_wchar((char)0);
                else
                    orbStream.write_wchar(((Character)value).charValue());
                break;
            case 'F':
                if (value == null)
                    orbStream.write_float((float)0);
                else
                    orbStream.write_float(((Float)value).floatValue());
                break;
            case 'D':
                if (value == null)
                    orbStream.write_double((double)0);
                else
                    orbStream.write_double(((Double)value).doubleValue());
                break;
            case 'I':
                if (value == null)
                    orbStream.write_long((int)0);
                else
                    orbStream.write_long(((Integer)value).intValue());
                break;
            case 'J':
                if (value == null)
                    orbStream.write_longlong((long)0);
                else
                    orbStream.write_longlong(((Long)value).longValue());
                break;
            case 'S':
                if (value == null)
                    orbStream.write_short((short)0);
                else
                    orbStream.write_short(((Short)value).shortValue());
                break;
            case 'Z':
                if (value == null)
                    orbStream.write_boolean(false);
                else
                    orbStream.write_boolean(((Boolean)value).booleanValue());
                break;
            case '[':
            case 'L':
                // What to do if it's null?
                writeObjectField(field, value);
                break;
            default:
                // XXX I18N, Logging needed.
                throw new InvalidClassException(currentClassDesc.getName());
            }
    }

    private void writeObjectField(ObjectStreamField field,
                                  Object objectValue) throws IOException {

        if (ObjectStreamClassCorbaExt.isAny(field.getTypeString())) {
            javax.rmi.CORBA.Util.writeAny(orbStream, objectValue);
        }
        else {
            Class type = field.getType();
            int callType = ValueHandlerImpl.kValueType;

            if (type.isInterface()) {
                String className = type.getName();

                if (java.rmi.Remote.class.isAssignableFrom(type)) {

                    // RMI Object reference...

                    callType = ValueHandlerImpl.kRemoteType;


                } else if (org.omg.CORBA.Object.class.isAssignableFrom(type)){

                    // IDL Object reference...
                    callType = ValueHandlerImpl.kRemoteType;

                } else if (RepositoryId.isAbstractBase(type)) {
                    // IDL Abstract Object reference...
                    callType = ValueHandlerImpl.kAbstractType;
                } else if (ObjectStreamClassCorbaExt.isAbstractInterface(type)) {
                    callType = ValueHandlerImpl.kAbstractType;
                }
            }

            switch (callType) {
            case ValueHandlerImpl.kRemoteType:
                Util.writeRemoteObject(orbStream, objectValue);
                break;
            case ValueHandlerImpl.kAbstractType:
                Util.writeAbstractObject(orbStream, objectValue);
                break;
            case ValueHandlerImpl.kValueType:
                try{
                    orbStream.write_value((java.io.Serializable)objectValue, type);
                }
                catch(ClassCastException cce){
                    if (objectValue instanceof java.io.Serializable)
                        throw cce;
                    else
                        Utility.throwNotSerializableForCorba(objectValue.getClass().getName());
                }
            }
        }
    }

    /* Write the fields of the specified class by invoking the appropriate
     * write* method on this class.
     */
    private void outputClassFields(Object o, Class cl,
                                   ObjectStreamField[] fields)
        throws IOException, InvalidClassException {

        for (int i = 0; i < fields.length; i++) {
            if (fields[i].getField() == null)
                // XXX I18N, Logging needed.
                throw new InvalidClassException(cl.getName(),
                                                "Nonexistent field " + fields[i].getName());

            try {
                switch (fields[i].getTypeCode()) {
                    case 'B':
                        byte byteValue = fields[i].getField().getByte( o ) ;
                        orbStream.write_octet(byteValue);
                        break;
                    case 'C':
                        char charValue = fields[i].getField().getChar( o ) ;
                        orbStream.write_wchar(charValue);
                        break;
                    case 'F':
                        float floatValue = fields[i].getField().getFloat( o ) ;
                        orbStream.write_float(floatValue);
                        break;
                    case 'D' :
                        double doubleValue = fields[i].getField().getDouble( o ) ;
                        orbStream.write_double(doubleValue);
                        break;
                    case 'I':
                        int intValue = fields[i].getField().getInt( o ) ;
                        orbStream.write_long(intValue);
                        break;
                    case 'J':
                        long longValue = fields[i].getField().getLong( o ) ;
                        orbStream.write_longlong(longValue);
                        break;
                    case 'S':
                        short shortValue = fields[i].getField().getShort( o ) ;
                        orbStream.write_short(shortValue);
                        break;
                    case 'Z':
                        boolean booleanValue = fields[i].getField().getBoolean( o ) ;
                        orbStream.write_boolean(booleanValue);
                        break;
                    case '[':
                    case 'L':
                        Object objectValue = fields[i].getField().get( o ) ;
                        writeObjectField(fields[i], objectValue);
                        break;
                    default:
                        // XXX I18N, Logging needed.
                        throw new InvalidClassException(cl.getName());
                }
            } catch (IllegalAccessException exc) {
                throw wrapper.illegalFieldAccess( exc, fields[i].getName() ) ;
            }
        }
    }
}

⏎ com/sun/corba/se/impl/io/IIOPOutputStream.java

Or download all of them as a single archive file:

File name: jre-rt-com-1.8.0_191-src.zip
File size: 8099783 bytes
Release date: 2018-10-28
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