Added serialVersionUID field in Serializable objects of module io.

Author: IdamkinI

io/src/main/java/com/itextpdf/io/source/ArrayRandomAccessSource.java

@@ -6,6 +6,9 @@
  * A RandomAccessSource that is based on an underlying byte array
  */
 class ArrayRandomAccessSource implements RandomAccessSource, Serializable {
+
+    private static final long serialVersionUID = 8497059230517630513L;
+
     private byte[] array;
 
     public ArrayRandomAccessSource(byte[] array) {

io/src/main/java/com/itextpdf/io/source/ByteBuffer.java

@@ -6,6 +6,8 @@ public class ByteBuffer implements Serializable{
 
     private static final byte[] bytes = new byte[]{48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 97, 98, 99, 100, 101, 102};
 
+    private static final long serialVersionUID = -4380712536267312975L;
+
     protected int count;
     private byte[] buffer;
 

io/src/main/java/com/itextpdf/io/source/PdfTokenizer.java

@@ -8,6 +8,8 @@
 
 public class PdfTokenizer implements Closeable, Serializable {
 
+    private static final long serialVersionUID = -2949864233416670521L;
+
     public enum TokenType {
         Number,
         String,

io/src/main/java/com/itextpdf/io/source/RandomAccessFileOrArray.java

@@ -7,6 +7,9 @@
 
 public class RandomAccessFileOrArray implements DataInput, Serializable {
 
+    private static final long serialVersionUID = -169314546265954851L;
+
+
     /**
      * When true the file access is not done through a memory mapped file. Use it if the file
      * is too big to be mapped in your address space.