Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\webkit\network\FormDataElement.java

/*
 * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
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 */

package com.sun.webkit.network;

import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * A form data element, such as a byte array or a local file.
 */
abstract class FormDataElement {

/**
     * The input stream from which the content of this element
     * can be read.
     */
    private InputStream inputStream;

/**
     * Opens this element and makes its size and content available
     * for retrieval.
     */
    void open() throws IOException {
        inputStream = createInputStream();
    }

/**
     * Returns the size of this element's content in bytes.
     */
    long getSize() {
        if (inputStream == null) {
            throw new IllegalStateException();
        }
        return doGetSize();
    }

/**
     * Returns the input stream from which the content of this element
     * can be read.
     */
    InputStream getInputStream() {
        if (inputStream == null) {
            throw new IllegalStateException();
        }
        return inputStream;
    }

/**
     * Closes this element and releases all resources associated with it.
     * This method makes the element's size and content unavailable
     * for retrieval.
     * This method is a no op if the element is already closed.
     */
    void close() throws IOException {
        if (inputStream != null) {
            inputStream.close();
            inputStream = null;
        }
    }

/**
     * Creates the input stream from which the content of this element
     * can be read.
     */
    protected abstract InputStream createInputStream() throws IOException;

/**
     * Returns the size of this element's content in bytes.
     */
    protected abstract long doGetSize();

/**
     * Creates a new FormDataElement from a byte array.
     */
    private static FormDataElement fwkCreateFromByteArray(byte[] byteArray) {
        return new ByteArrayElement(byteArray);
    }

/**
     * Creates a new FormDataElement from a file.
     */
    private static FormDataElement fwkCreateFromFile(String fileName) {
        return new FileElement(fileName);
    }

/**
     * A form data element based on a byte array.
     */
    private static final class ByteArrayElement extends FormDataElement {

private final byte[] byteArray;

private ByteArrayElement(byte[] byteArray) {
            this.byteArray = byteArray;
        }

@Override
        protected InputStream createInputStream() {
            return new ByteArrayInputStream(byteArray);
        }

@Override
        protected long doGetSize() {
            return byteArray.length;
        }
    }

/**
     * A form data element based on a file.
     */
    private static final class FileElement extends FormDataElement {

private final File file;

private FileElement(String filename) {
            file = new File(filename);
        }

@Override
        protected InputStream createInputStream() throws IOException {
            return new BufferedInputStream(new FileInputStream(file));
        }

@Override
        protected long doGetSize() {
            return file.length();
        }
    }
}

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