com.ibm.mq.data

Interface MQDataInput

  • All Known Implementing Classes:
    MQDataInputStream


    public interface MQDataInput
    An MQDataInput implementation allows read access to some underlying store of semi-structured binary data. It provides read methods for character data, integer data, floating-point data, packed decimal data and serialized Java objects. It converts between different representations of this data (e.g. EBCDIC/ASCII character data, big-endian and little-endian integer data) driven by the CCSID and encoding properties. It is intended for reading WebSphere MQ message data, and uses WMQ conventions.
    • Field Summary

      Fields 
      Modifier and Type Field and Description
      static java.lang.String COPYRIGHT 
    • Method Summary

      Methods 
      Modifier and Type Method and Description
      int getCCSID()
      Returns the Coded Character Set Identifier currently used for character read operations
      int getDataOffset()
      Returns the current offset of the cursor, relative to the position where this MQDataOutput object was originally created.
      DecimalEncoding getDecimalEncoding()
      Returns the DecimalEncoding currently used for packed-decimal read operations.
      int getEncoding()
      Return the WMQ encoding identifier representing the three encodings (integer, floating-point and packed-decimal) currently used for numeric read operations.
      FloatEncoding getFloatEncoding()
      Returns the FloatEncoding currently used for floating-point read operations.
      IntegerEncoding getIntegerEncoding()
      Returns the IntegerEncoding currently used for integer read operations.
      byte readByte()
      Reads a single (signed) byte.
      byte[] readBytes(int length)
      Reads a number of (signed) bytes from the stream, returning them as an array.
      java.math.BigInteger readDecimal(int length)
      Reads a number of bytes as a packed-decimal integer.
      short readDecimal2()
      Reads two bytes as a packed-decimal integer.
      int readDecimal4()
      Reads four bytes as a packed-decimal integer.
      long readDecimal8()
      Reads eight bytes as a packed-decimal integer.
      double readDouble()
      Reads eight bytes as a floating-point number, interpreted according to the current floating-point encoding.
      float readFloat()
      Reads four bytes as a floating-point number, interpreted according to the current floating-point encoding.
      void readFully(byte[] b)
      Reads bytes into the parameter byte array.
      void readFully(byte[] b, int off, int len)
      Reads some number of bytes into a bytearray beginning from a given offset into the byte array.
      int readInt()
      Reads four bytes as a signed integer.
      long readLong()
      Reads eight bytes as a signed long integer.
      byte readMQBYTE()
      Reads a single (signed) byte.
      byte[] readMQBYTE(int length)
      Reads a number of (signed) bytes from the stream, returning them as an array.
      byte[] readMQBYTE16()
      Reads 16 bytes from the stream, returning them as an array.
      byte[] readMQBYTE24()
      Reads 24 bytes from the stream, returning them as an array.
      byte[] readMQBYTE32()
      Reads 32 bytes from the stream, returning them as an array.
      byte[] readMQBYTE8()
      Reads 8 bytes from the stream, returning them as an array.
      char readMQCHAR()
      Reads a single byte from the stream and converts it to a character, using the current CCSID.
      java.lang.String readMQCHAR(int length)
      Reads a number of bytes from the stream and converts them into a String, using the current CCSID.
      java.lang.String readMQCHAR12()
      Reads 12 bytes from the stream and converts them into a String, using the current CCSID.
      java.lang.String readMQCHAR128()
      Reads 128 bytes from the stream and converts them into a String, using the current CCSID.
      java.lang.String readMQCHAR16()
      Reads 16 bytes from the stream and converts them into a String, using the current CCSID.
      java.lang.String readMQCHAR20()
      Reads 20 bytes from the stream and converts them into a String, using the current CCSID.
      java.lang.String readMQCHAR24()
      Reads 24 bytes from the stream and converts them into a String, using the current CCSID.
      java.lang.String readMQCHAR256()
      Reads 256 bytes from the stream and converts them into a String, using the current CCSID.
      java.lang.String readMQCHAR28()
      Reads 28 bytes from the stream and converts them into a String, using the current CCSID.
      java.lang.String readMQCHAR32()
      Reads 32 bytes from the stream and converts them into a String, using the current CCSID.
      java.lang.String readMQCHAR4()
      Reads 4 bytes from the stream and converts them into a String, using the current CCSID.
      java.lang.String readMQCHAR48()
      Reads 48 bytes from the stream and converts them into a String, using the current CCSID.
      java.lang.String readMQCHAR64()
      Reads 64 bytes from the stream and converts them into a String, using the current CCSID.
      java.lang.String readMQCHAR8()
      Reads 8 bytes from the stream and converts them into a String, using the current CCSID.
      int readMQINT32()
      Reads four bytes as a signed integer.
      long readMQINT64()
      Reads eight bytes as a signed long integer.
      int readMQLONG()
      Reads four bytes as a signed integer.
      short readMQSHORT()
      Reads two bytes as a signed short.
      long readMQUINT32()
      Reads four bytes as an unsigned integer.
      java.math.BigInteger readMQUINT64()
      Reads eight bytes as an unsigned integer.
      long readMQULONG()
      Reads four bytes as an unsigned integer.
      int readMQUSHORT()
      Reads two bytes as an unsigned integer.
      java.lang.Object readObject()
      Reads a serialized Java Object from the stream
      short readShort()
      Reads two bytes as a signed short.
      char readUCS2Char()
      Reads two bytes from the stream and interprets it as a Unicode character.
      java.lang.String readUTF()
      Reads a UTF-8 encoded string from the stream.
      void setCCSID(int ccsid)
      Sets the Coded Character Set Identifier to be used for subsequent character read operations.
      void setDecimalEncoding(DecimalEncoding de)
      Sets the DecimalEncoding to be used for subsequent packed-decimal read operations.
      void setEncoding(int encoding)
      Sets all three encoding values - integer, floating-point and packed-decimal, using the WMQ encoding identifier.
      void setFloatEncoding(FloatEncoding fe)
      Sets the FloatEncoding to be used for subsequent floating-point read operations.
      void setIntegerEncoding(IntegerEncoding ie)
      Sets the IntegerEncoding to be uesd for subsequence integer read operations.
      int skipBytes(int n)
      Attempts to skip over a number of bytes, returning the number of bytes actually skipped.
    • Method Detail

      • setCCSID

        void setCCSID(int ccsid)
                      throws java.io.IOException
        Sets the Coded Character Set Identifier to be used for subsequent character read operations.
        Parameters:
        ccsid - new CCSID value
        Throws:
        java.nio.charset.UnsupportedCharsetException - if the JDK does not support this character set
        java.io.IOException
      • getCCSID

        int getCCSID()
                     throws java.io.IOException
        Returns the Coded Character Set Identifier currently used for character read operations
        Returns:
        current CCSID value
        Throws:
        java.io.IOException
      • setIntegerEncoding

        void setIntegerEncoding(IntegerEncoding ie)
                                throws java.io.IOException
        Sets the IntegerEncoding to be uesd for subsequence integer read operations. IntegerEncoding.UNDEFINED is treated as IntegerEncoding.NORMAL.
        Parameters:
        ie - new integer encoding value
        Throws:
        java.io.IOException
        See Also:
        IntegerEncoding
      • getIntegerEncoding

        IntegerEncoding getIntegerEncoding()
                                           throws java.io.IOException
        Returns the IntegerEncoding currently used for integer read operations.
        Returns:
        current integer encoding
        Throws:
        java.io.IOException
        See Also:
        IntegerEncoding
      • setFloatEncoding

        void setFloatEncoding(FloatEncoding fe)
                              throws java.io.IOException
        Sets the FloatEncoding to be used for subsequent floating-point read operations. FloatEncoding.UNDEFINED is treated as FloatEncoding.IEEE_NORMAL.
        Parameters:
        fe - new floating-point encoding value
        Throws:
        java.io.IOException
        See Also:
        FloatEncoding
      • getFloatEncoding

        FloatEncoding getFloatEncoding()
                                       throws java.io.IOException
        Returns the FloatEncoding currently used for floating-point read operations.
        Returns:
        current floating-point encoding
        Throws:
        java.io.IOException
        See Also:
        FloatEncoding
      • setDecimalEncoding

        void setDecimalEncoding(DecimalEncoding de)
                                throws java.io.IOException
        Sets the DecimalEncoding to be used for subsequent packed-decimal read operations. DecimalEncoding.UNDEFINED is treated as DecimalEncoding.NORMAL
        Parameters:
        de - new packed-decimal encoding value
        Throws:
        java.io.IOException
        See Also:
        DecimalEncoding
      • getDecimalEncoding

        DecimalEncoding getDecimalEncoding()
                                           throws java.io.IOException
        Returns the DecimalEncoding currently used for packed-decimal read operations.
        Returns:
        current packed-decimal encoding
        Throws:
        java.io.IOException
        See Also:
        DecimalEncoding
      • setEncoding

        void setEncoding(int encoding)
                         throws java.io.IOException
        Sets all three encoding values - integer, floating-point and packed-decimal, using the WMQ encoding identifier. These will be used for subsequent numeric read operations.
        Parameters:
        encoding - integer representation of the new encoding
        Throws:
        java.lang.IllegalArgumentException - if passed an unrecognised encoding identifier
        java.io.IOException
      • getEncoding

        int getEncoding()
                        throws java.io.IOException
        Return the WMQ encoding identifier representing the three encodings (integer, floating-point and packed-decimal) currently used for numeric read operations.
        Returns:
        integer representation of the current encoding
        Throws:
        java.io.IOException
      • getDataOffset

        int getDataOffset()
                          throws java.io.IOException
        Returns the current offset of the cursor, relative to the position where this MQDataOutput object was originally created. Behaviour is undefined if the underlying data source has been manipulated without going through this MQDataOutput object.
        Returns:
        number of bytes read or skipped
        Throws:
        java.io.IOException
      • skipBytes

        int skipBytes(int n)
                      throws java.io.IOException
        Attempts to skip over a number of bytes, returning the number of bytes actually skipped.
        Parameters:
        n - number of bytes to attempt to skip
        Returns:
        number of bytes actually skipped; 0 if at the end of the stream.
        Throws:
        java.io.IOException
        See Also:
        DataInput.skipBytes(int)
      • readByte

        byte readByte()
                      throws java.io.IOException
        Reads a single (signed) byte.
        Returns:
        byte read from stream
        Throws:
        java.io.EOFException - if at the end of the stream
        java.io.IOException
      • readBytes

        byte[] readBytes(int length)
                         throws java.io.IOException
        Reads a number of (signed) bytes from the stream, returning them as an array.
        Parameters:
        length - number of bytes to read
        Returns:
        an array containing the read bytes
        Throws:
        java.io.EOFException - if at the end of the stream
        java.io.IOException
      • readMQBYTE

        byte readMQBYTE()
                        throws java.io.IOException
        Reads a single (signed) byte.
        Returns:
        byte read from stream
        Throws:
        java.io.EOFException - if at the end of the stream
        java.io.IOException
      • readMQBYTE

        byte[] readMQBYTE(int length)
                          throws java.io.IOException
        Reads a number of (signed) bytes from the stream, returning them as an array.
        Parameters:
        length - number of bytes to read
        Returns:
        an array containing the read bytes
        Throws:
        java.io.EOFException - if at the end of the stream
        java.io.IOException
      • readMQBYTE8

        byte[] readMQBYTE8()
                           throws java.io.IOException
        Reads 8 bytes from the stream, returning them as an array.
        Returns:
        an array containing the read bytes
        Throws:
        java.io.EOFException - if at the end of the stream
        java.io.IOException
      • readMQBYTE16

        byte[] readMQBYTE16()
                            throws java.io.IOException
        Reads 16 bytes from the stream, returning them as an array.
        Returns:
        an array containing the read bytes
        Throws:
        java.io.EOFException - if at the end of the stream
        java.io.IOException
      • readMQBYTE24

        byte[] readMQBYTE24()
                            throws java.io.IOException
        Reads 24 bytes from the stream, returning them as an array.
        Returns:
        an array containing the read bytes
        Throws:
        java.io.EOFException - if at the end of the stream
        java.io.IOException
      • readMQBYTE32

        byte[] readMQBYTE32()
                            throws java.io.IOException
        Reads 32 bytes from the stream, returning them as an array.
        Returns:
        an array containing the read bytes
        Throws:
        java.io.EOFException - if at the end of the stream
        java.io.IOException
      • readFully

        void readFully(byte[] b)
                       throws java.io.IOException
        Reads bytes into the parameter byte array.
        Parameters:
        b - byte array to read into
        Throws:
        java.lang.NullPointerException - if b is null
        java.io.EOFException - if the stream does not have enough data left to fill the byte array
        java.io.IOException
        See Also:
        DataInput.readFully(byte[])
      • readFully

        void readFully(byte[] b,
                     int off,
                     int len)
                       throws java.io.IOException
        Reads some number of bytes into a bytearray beginning from a given offset into the byte array.
        Parameters:
        b - byte array to read into
        off - starting index in the byte array
        len - number of bytes to read
        Throws:
        java.lang.NullPointerException - if b is null
        java.lang.IndexOutOfBoundsException - if off is negative, len is negative, or off+len is greater than the length of b
        java.io.EOFException - if the stream ends before len bytes have been read
        java.io.IOException
        See Also:
        DataInput.readFully(byte[], int, int)
      • readMQCHAR

        char readMQCHAR()
                        throws java.io.IOException
        Reads a single byte from the stream and converts it to a character, using the current CCSID. Fails if the next byte in the stream does not completely represent a single character.
        Returns:
        a byte from the stream as a character
        Throws:
        java.io.EOFException - at end of stream
        java.io.IOException - if the next byte does not completely represent a single character, or for unexpected errors.
      • readMQCHAR

        java.lang.String readMQCHAR(int length)
                                    throws java.io.IOException
        Reads a number of bytes from the stream and converts them into a String, using the current CCSID.
        Parameters:
        length - number of bytes to read
        Throws:
        java.nio.charset.CharacterCodingException - if conversion fails
        java.io.EOFException - at end of stream
        java.io.IOException
      • readMQCHAR4

        java.lang.String readMQCHAR4()
                                     throws java.io.IOException
        Reads 4 bytes from the stream and converts them into a String, using the current CCSID.
        Returns:
        String read from the stream
        Throws:
        java.nio.charset.CharacterCodingException - if conversion fails
        java.io.EOFException - at end of stream
        java.io.IOException
      • readMQCHAR8

        java.lang.String readMQCHAR8()
                                     throws java.io.IOException
        Reads 8 bytes from the stream and converts them into a String, using the current CCSID.
        Returns:
        String read from the stream
        Throws:
        java.nio.charset.CharacterCodingException - if conversion fails
        java.io.EOFException - at end of stream
        java.io.IOException
      • readMQCHAR12

        java.lang.String readMQCHAR12()
                                      throws java.io.IOException
        Reads 12 bytes from the stream and converts them into a String, using the current CCSID.
        Returns:
        String read from the stream
        Throws:
        java.nio.charset.CharacterCodingException - if conversion fails
        java.io.EOFException - at end of stream
        java.io.IOException
      • readMQCHAR16

        java.lang.String readMQCHAR16()
                                      throws java.io.IOException
        Reads 16 bytes from the stream and converts them into a String, using the current CCSID.
        Returns:
        String read from the stream
        Throws:
        java.nio.charset.CharacterCodingException - if conversion fails
        java.io.EOFException - at end of stream
        java.io.IOException
      • readMQCHAR20

        java.lang.String readMQCHAR20()
                                      throws java.io.IOException
        Reads 20 bytes from the stream and converts them into a String, using the current CCSID.
        Returns:
        String read from the stream
        Throws:
        java.nio.charset.CharacterCodingException - if conversion fails
        java.io.EOFException - at end of stream
        java.io.IOException
      • readMQCHAR24

        java.lang.String readMQCHAR24()
                                      throws java.io.IOException
        Reads 24 bytes from the stream and converts them into a String, using the current CCSID.
        Returns:
        String read from the stream
        Throws:
        java.nio.charset.CharacterCodingException - if conversion fails
        java.io.EOFException - at end of stream
        java.io.IOException
      • readMQCHAR28

        java.lang.String readMQCHAR28()
                                      throws java.io.IOException
        Reads 28 bytes from the stream and converts them into a String, using the current CCSID.
        Returns:
        String read from the stream
        Throws:
        java.nio.charset.CharacterCodingException - if conversion fails
        java.io.EOFException - at end of stream
        java.io.IOException
      • readMQCHAR32

        java.lang.String readMQCHAR32()
                                      throws java.io.IOException
        Reads 32 bytes from the stream and converts them into a String, using the current CCSID.
        Returns:
        String read from the stream
        Throws:
        java.nio.charset.CharacterCodingException - if conversion fails
        java.io.EOFException - at end of stream
        java.io.IOException
      • readMQCHAR48

        java.lang.String readMQCHAR48()
                                      throws java.io.IOException
        Reads 48 bytes from the stream and converts them into a String, using the current CCSID.
        Returns:
        String read from the stream
        Throws:
        java.nio.charset.CharacterCodingException - if conversion fails
        java.io.EOFException - at end of stream
        java.io.IOException
      • readMQCHAR64

        java.lang.String readMQCHAR64()
                                      throws java.io.IOException
        Reads 64 bytes from the stream and converts them into a String, using the current CCSID.
        Returns:
        String read from the stream
        Throws:
        java.nio.charset.CharacterCodingException - if conversion fails
        java.io.EOFException - at end of stream
        java.io.IOException
      • readMQCHAR128

        java.lang.String readMQCHAR128()
                                       throws java.io.IOException
        Reads 128 bytes from the stream and converts them into a String, using the current CCSID.
        Returns:
        String read from the stream
        Throws:
        java.nio.charset.CharacterCodingException - if conversion fails
        java.io.EOFException - at end of stream
        java.io.IOException
      • readMQCHAR256

        java.lang.String readMQCHAR256()
                                       throws java.io.IOException
        Reads 256 bytes from the stream and converts them into a String, using the current CCSID.
        Returns:
        String read from the stream
        Throws:
        java.nio.charset.CharacterCodingException - if conversion fails
        java.io.EOFException - at end of stream
        java.io.IOException
      • readUCS2Char

        char readUCS2Char()
                          throws java.io.IOException
        Reads two bytes from the stream and interprets it as a Unicode character. The byte-order is determined by the current integer encoding.
        Returns:
        a character read from the stream
        Throws:
        java.io.EOFException - at end of stream
        java.io.IOException
      • readUTF

        java.lang.String readUTF()
                                 throws java.io.IOException
        Reads a UTF-8 encoded string from the stream. The first two bytes of the stream give the length of the string. This is compatible with DataInput.writeUTF().
        Returns:
        a String, read from the stream
        Throws:
        java.io.EOFException - at end of stream
        java.io.UTFDataFormatException - if the stream does not contain a valid UTF-8 string
        java.io.IOException
        See Also:
        DataInput.readUTF()
      • readShort

        short readShort()
                        throws java.io.IOException
        Reads two bytes as a signed short. The byte order is determined by the current integer encoding.
        Returns:
        the read short
        Throws:
        java.io.EOFException - at end of stream
        java.io.IOException
        See Also:
        DataInput.readShort()
      • readMQSHORT

        short readMQSHORT()
                          throws java.io.IOException
        Reads two bytes as a signed short. The byte order is determined by the current integer encoding.
        Returns:
        the read short
        Throws:
        java.io.EOFException - at end of stream
        java.io.IOException
      • readMQUSHORT

        int readMQUSHORT()
                         throws java.io.IOException
        Reads two bytes as an unsigned integer. The byte order is determined by the current integer encoding.
        Returns:
        a two-byte unsigned integer, as an int
        Throws:
        java.io.EOFException - at end of stream
        java.io.IOException
      • readInt

        int readInt()
                    throws java.io.IOException
        Reads four bytes as a signed integer. The byte order is determined by the current integer encoding.
        Returns:
        the read int
        Throws:
        java.io.EOFException - at end of stream
        java.io.IOException
        See Also:
        DataInput.readInt()
      • readMQLONG

        int readMQLONG()
                       throws java.io.IOException
        Reads four bytes as a signed integer. The byte order is determined by the current integer encoding.
        Returns:
        the read int
        Throws:
        java.io.EOFException - at end of stream
        java.io.IOException
      • readMQULONG

        long readMQULONG()
                         throws java.io.IOException
        Reads four bytes as an unsigned integer. The byte order is determined by the current integer encoding.
        Returns:
        a four-byte unsigned integer, as a long
        Throws:
        java.io.EOFException - at end of stream
        java.io.IOException
      • readMQINT32

        int readMQINT32()
                        throws java.io.IOException
        Reads four bytes as a signed integer. The byte order is determined by the current integer encoding.
        Returns:
        the read int
        Throws:
        java.io.EOFException - at end of stream
        java.io.IOException
      • readMQUINT32

        long readMQUINT32()
                          throws java.io.IOException
        Reads four bytes as an unsigned integer. The byte order is determined by the current integer encoding.
        Returns:
        a four-byte unsigned integer, as a long
        Throws:
        java.io.EOFException - at end of stream
        java.io.IOException
      • readLong

        long readLong()
                      throws java.io.IOException
        Reads eight bytes as a signed long integer. The byte order is determined by the current integer encoding.
        Returns:
        the read long
        Throws:
        java.io.EOFException - at end of stream
        java.io.IOException
        See Also:
        DataInput.readLong()
      • readMQINT64

        long readMQINT64()
                         throws java.io.IOException
        Reads eight bytes as a signed long integer. The byte order is determined by the current integer encoding.
        Returns:
        the read long
        Throws:
        java.io.EOFException - at end of stream
        java.io.IOException
      • readMQUINT64

        java.math.BigInteger readMQUINT64()
                                          throws java.io.IOException
        Reads eight bytes as an unsigned integer. The byte order is determined by the current integer encoding.
        Returns:
        an eight-byte unsigned integer, as a BigInteger
        Throws:
        java.io.EOFException - at end of stream
        java.io.IOException
      • readFloat

        float readFloat()
                        throws java.io.IOException
        Reads four bytes as a floating-point number, interpreted according to the current floating-point encoding. If the S390 encoding is used, this is the short HFP format. Note that conversion from this format to a Java float may lose precision.
        Returns:
        a four-byte precision floating point number.
        Throws:
        java.io.EOFException - at end of stream
        java.io.IOException
        See Also:
        DataInput.readFloat()
      • readDouble

        double readDouble()
                          throws java.io.IOException
        Reads eight bytes as a floating-point number, interpreted according to the current floating-point encoding. If the S390 encoding is used, this is the long HFP format. Note that conversion from this format to a Java double may lose precision.
        Returns:
        an eight-byte precision floating point number.
        Throws:
        java.io.EOFException - at end of stream
        java.io.IOException
        See Also:
        DataInput.readFloat()
      • readDecimal

        java.math.BigInteger readDecimal(int length)
                                         throws java.io.IOException
        Reads a number of bytes as a packed-decimal integer. The current packed-decimal encoding determines the byte order.

        Unsigned packed-decimals are treated as positive; this method cannot distinguish between positive and negative zero.

        Parameters:
        length - number of bytes to read
        Returns:
        the read packed-decimal number, as a BigInteger.
        Throws:
        java.io.EOFException - at end of stream
        java.io.IOException - if a malformed packed-decimal is encountered, or for other error.
      • readDecimal2

        short readDecimal2()
                           throws java.io.IOException
        Reads two bytes as a packed-decimal integer. The current packed-decimal encoding determines the byte order.

        Unsigned packed-decimals are treated as positive; this method cannot distinguish between positive and negative zero.

        Returns:
        the read packed-decimal number, as a short, between -999 and 999 inclusive.
        Throws:
        java.io.EOFException - at end of stream
        java.io.IOException - if a malformed packed-decimal is encountered, or for other error.
      • readDecimal4

        int readDecimal4()
                         throws java.io.IOException
        Reads four bytes as a packed-decimal integer. The current packed-decimal encoding determines the byte order.

        Unsigned packed-decimals are treated as positive; this method cannot distinguish between positive and negative zero.

        Returns:
        the read packed-decimal number, as an int, between -9999999 and 9999999 inclusive.
        Throws:
        java.io.EOFException - at end of stream
        java.io.IOException - if a malformed packed-decimal is encountered, or for other error.
      • readDecimal8

        long readDecimal8()
                          throws java.io.IOException
        Reads eight bytes as a packed-decimal integer. The current packed-decimal encoding determines the byte order.

        Unsigned packed-decimals are treated as positive; this method cannot distinguish between positive and negative zero.

        Returns:
        the read packed-decimal number, as a long, between -1015 and 1015 exclusive
        Throws:
        java.io.EOFException - at end of stream
        java.io.IOException - if a malformed packed-decimal is encountered, or for other error.
      • readObject

        java.lang.Object readObject()
                                    throws java.io.IOException,
                                           java.lang.ClassNotFoundException
        Reads a serialized Java Object from the stream
        Returns:
        a deserialized Object.
        Throws:
        java.io.IOException
        java.lang.ClassNotFoundException
        See Also:
        ObjectInput.readObject()
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