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## javax.jms
Interface BytesMessage

All Superinterfaces:
  Message

    public interface BytesMessage

extends Message

A `BytesMessage` object is used to send a message containing a stream of uninterpreted bytes. It inherits from the `Message` interface and adds a bytes message body. The receiver of the message supplies the interpretation of the bytes.

The `BytesMessage` methods are based largely on those found in `java.io.DataInputStream` and `java.io.DataOutputStream`.

This message type is for client encoding of existing message formats. If possible, one of the other self-defining message types should be used instead.

Although the JMS API allows the use of message properties with byte messages, they are typically not used, since the inclusion of properties may affect the format.

The primitive types can be written explicitly using methods for each type. They may also be written generically as objects. For instance, a call to `BytesMessage.writeInt(6)` is equivalent to `BytesMessage.writeObject(new Integer(6))`. Both forms are provided, because the explicit form is convenient for static programming, and the object form is needed when types are not known at compile time.

When the message is first created, and when `clearBody` is called, the body of the message is in write-only mode. After the first call to `reset` has been made, the message body is in read-only mode. After a message has been sent, the client that sent it can retain and modify it without affecting the message that has been sent. The same message object can be sent multiple times. When a message has been received, the provider has called `reset` so that the message body is in read-only mode for the client.

If `clearBody` is called on a message in read-only mode, the message body is cleared and the message is in write-only mode.

If a client attempts to read a message in write-only mode, a `MessageNotReadableException` is thrown.

If a client attempts to write a message in read-only mode, a `MessageNotWriteableException` is thrown.

See Also:
  `Session.createBytesMessage()`, `MapMessage`, `Message`, `ObjectMessage`, `StreamMessage`, `TextMessage`

Field Summary

Fields inherited from interface javax.jms.Message
`DEFAULT_DELIVERY_MODE, DEFAULT_PRIORITY, DEFAULT_TIME_TO_LIVE`

Method Summary
`long` | `getBodyLength()` Gets the number of bytes of the message body when the message is in read-only mode.
`boolean` | `readBoolean()` Reads a `boolean` from the bytes message stream.
`byte` | `readByte()` Reads a signed 8-bit value from the bytes message stream.
`int` | `readBytes(byte[] value)` Reads a byte array from the bytes message stream.
`int` | `readBytes(byte[] value, int length)` Reads a portion of the bytes message stream.
`char` | `readChar()` Reads a Unicode character value from the bytes message stream.
`double` | `readDouble()` Reads a `double` from the bytes message stream.
`float` | `readFloat()` Reads a `float` from the bytes message stream.
`int` | `readInt()` Reads a signed 32-bit integer from the bytes message stream.
`long` | `readLong()` Reads a signed 64-bit integer from the bytes message stream.
`short` | `readShort()` Reads a signed 16-bit number from the bytes message stream.
`int` | `readUnsignedByte()` Reads an unsigned 8-bit number from the bytes message stream.
`int` | `readUnsignedShort()` Reads an unsigned 16-bit number from the bytes message stream.
`java.lang.String` | `readUTF()` Reads a string that has been encoded using a modified UTF-8 format from the bytes message stream.
`void` | `reset()` Puts the message body in read-only mode and repositions the stream of bytes to the beginning.
`void` | `writeBoolean(boolean value)` Writes a `boolean` to the bytes message stream as a 1-byte value.
`void` | `writeByte(byte value)` Writes a `byte` to the bytes message stream as a 1-byte value.
`void` | `writeBytes(byte[] value)` Writes a byte array to the bytes message stream.
`void` | `writeBytes(byte[] value, int offset, int length)` Writes a portion of a byte array to the bytes message stream.
`void` | `writeChar(char value)` Writes a `char` to the bytes message stream as a 2-byte value, high byte first.
`void` | `writeDouble(double value)` Converts the `double` argument to a `long` using the `doubleToLongBits` method in class `Double`, and then writes that `long` value to the bytes message stream as an 8-byte quantity, high byte first.
`void` | `writeFloat(float value)` Converts the `float` argument to an `int` using the `floatToIntBits` method in class `Float`, and then writes that `int` value to the bytes message stream as a 4-byte quantity, high byte first.
`void` | `writeInt(int value)` Writes an `int` to the bytes message stream as four bytes, high byte first.
`void` | `writeLong(long value)` Writes a `long` to the bytes message stream as eight bytes, high byte first.
`void` | `writeObject(java.lang.Object value)` Writes an object to the bytes message stream.
`void` | `writeShort(short value)` Writes a `short` to the bytes message stream as two bytes, high byte first.
`void` | `writeUTF(java.lang.String value)` Writes a string to the bytes message stream using UTF-8 encoding in a machine-independent manner.

Methods inherited from interface javax.jms.Message
`acknowledge, clearBody, clearProperties, getBooleanProperty, getByteProperty, getDoubleProperty, getFloatProperty, getIntProperty, getJMSCorrelationID, getJMSCorrelationIDAsBytes, getJMSDeliveryMode, getJMSDestination, getJMSExpiration, getJMSMessageID, getJMSPriority, getJMSRedelivered, getJMSReplyTo, getJMSTimestamp, getJMSType, getLongProperty, getObjectProperty, getPropertyNames, getShortProperty, getStringProperty, propertyExists, setBooleanProperty, setByteProperty, setDoubleProperty, setFloatProperty, setIntProperty, setJMSCorrelationID, setJMSCorrelationIDAsBytes, setJMSDeliveryMode, setJMSDestination, setJMSExpiration, setJMSMessageID, setJMSPriority, setJMSRedelivered, setJMSReplyTo, setJMSTimestamp, setJMSType, setLongProperty, setObjectProperty, setShortProperty, setStringProperty`

Method Detail

### getBodyLength

    long getBodyLength()
                       throws JMSException

  Gets the number of bytes of the message body when the message is in read-only mode. The value returned can be used to allocate a byte array. The value returned is the entire length of the message body, regardless of where the pointer for reading the message is currently located.

  Returns:
    number of bytes in the message
  Throws:
    `JMSException` - if the JMS provider fails to read the message due to some internal error.
    `MessageNotReadableException` - if the message is in write-only mode.
  Since:
    1.1

### readBoolean

    boolean readBoolean()
                        throws JMSException

  Reads a `boolean` from the bytes message stream.

  Returns:
    the `boolean` value read
  Throws:
    `JMSException` - if the JMS provider fails to read the message due to some internal error.
    `MessageEOFException` - if unexpected end of bytes stream has been reached.
    `MessageNotReadableException` - if the message is in write-only mode.

### readByte

    byte readByte()
                  throws JMSException

  Reads a signed 8-bit value from the bytes message stream.

  Returns:
    the next byte from the bytes message stream as a signed 8-bit `byte`
  Throws:
    `JMSException` - if the JMS provider fails to read the message due to some internal error.
    `MessageEOFException` - if unexpected end of bytes stream has been reached.
    `MessageNotReadableException` - if the message is in write-only mode.

### readUnsignedByte

    int readUnsignedByte()
                         throws JMSException

  Reads an unsigned 8-bit number from the bytes message stream.

  Returns:
    the next byte from the bytes message stream, interpreted as an unsigned 8-bit number
  Throws:
    `JMSException` - if the JMS provider fails to read the message due to some internal error.
    `MessageEOFException` - if unexpected end of bytes stream has been reached.
    `MessageNotReadableException` - if the message is in write-only mode.

### readShort

    short readShort()
                    throws JMSException

  Reads a signed 16-bit number from the bytes message stream.

  Returns:
    the next two bytes from the bytes message stream, interpreted as a signed 16-bit number
  Throws:
    `JMSException` - if the JMS provider fails to read the message due to some internal error.
    `MessageEOFException` - if unexpected end of bytes stream has been reached.
    `MessageNotReadableException` - if the message is in write-only mode.

### readUnsignedShort

    int readUnsignedShort()
                          throws JMSException

  Reads an unsigned 16-bit number from the bytes message stream.

  Returns:
    the next two bytes from the bytes message stream, interpreted as an unsigned 16-bit integer
  Throws:
    `JMSException` - if the JMS provider fails to read the message due to some internal error.
    `MessageEOFException` - if unexpected end of bytes stream has been reached.
    `MessageNotReadableException` - if the message is in write-only mode.

### readChar

    char readChar()
                  throws JMSException

  Reads a Unicode character value from the bytes message stream.

  Returns:
    the next two bytes from the bytes message stream as a Unicode character
  Throws:
    `JMSException` - if the JMS provider fails to read the message due to some internal error.
    `MessageEOFException` - if unexpected end of bytes stream has been reached.
    `MessageNotReadableException` - if the message is in write-only mode.

### readInt

    int readInt()
                throws JMSException

  Reads a signed 32-bit integer from the bytes message stream.

  Returns:
    the next four bytes from the bytes message stream, interpreted as an `int`
  Throws:
    `JMSException` - if the JMS provider fails to read the message due to some internal error.
    `MessageEOFException` - if unexpected end of bytes stream has been reached.
    `MessageNotReadableException` - if the message is in write-only mode.

### readLong

    long readLong()
                  throws JMSException

  Reads a signed 64-bit integer from the bytes message stream.

  Returns:
    the next eight bytes from the bytes message stream, interpreted as a `long`
  Throws:
    `JMSException` - if the JMS provider fails to read the message due to some internal error.
    `MessageEOFException` - if unexpected end of bytes stream has been reached.
    `MessageNotReadableException` - if the message is in write-only mode.

### readFloat

    float readFloat()
                    throws JMSException

  Reads a `float` from the bytes message stream.

  Returns:
    the next four bytes from the bytes message stream, interpreted as a `float`
  Throws:
    `JMSException` - if the JMS provider fails to read the message due to some internal error.
    `MessageEOFException` - if unexpected end of bytes stream has been reached.
    `MessageNotReadableException` - if the message is in write-only mode.

### readDouble

    double readDouble()
                      throws JMSException

  Reads a `double` from the bytes message stream.

  Returns:
    the next eight bytes from the bytes message stream, interpreted as a `double`
  Throws:
    `JMSException` - if the JMS provider fails to read the message due to some internal error.
    `MessageEOFException` - if unexpected end of bytes stream has been reached.
    `MessageNotReadableException` - if the message is in write-only mode.

### readUTF

    java.lang.String readUTF()
                             throws JMSException

  Reads a string that has been encoded using a modified UTF-8 format from the bytes message stream.

  For more information on the UTF-8 format, see "File System Safe UCS Transformation Format (FSS_UTF)", X/Open Preliminary Specification, X/Open Company Ltd., Document Number: P316. This information also appears in ISO/IEC 10646, Annex P.

  Returns:
    a Unicode string from the bytes message stream
  Throws:
    `JMSException` - if the JMS provider fails to read the message due to some internal error.
    `MessageEOFException` - if unexpected end of bytes stream has been reached.
    `MessageNotReadableException` - if the message is in write-only mode.

### readBytes

    int readBytes(byte[] value)
                  throws JMSException

  Reads a byte array from the bytes message stream.

  If the length of array `value` is less than the number of bytes remaining to be read from the stream, the array should be filled. A subsequent call reads the next increment, and so on.

  If the number of bytes remaining in the stream is less than the length of array `value`, the bytes should be read into the array. The return value of the total number of bytes read will be less than the length of the array, indicating that there are no more bytes left to be read from the stream. The next read of the stream returns -1.

  Parameters:
    `value` - the buffer into which the data is read
  Returns:
    the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached
  Throws:
    `JMSException` - if the JMS provider fails to read the message due to some internal error.
    `MessageNotReadableException` - if the message is in write-only mode.

### readBytes

    int readBytes(byte[] value,
                  int length)
                  throws JMSException

  Reads a portion of the bytes message stream.

  If the length of array `value` is less than the number of bytes remaining to be read from the stream, the array should be filled. A subsequent call reads the next increment, and so on.

  If the number of bytes remaining in the stream is less than the length of array `value`, the bytes should be read into the array. The return value of the total number of bytes read will be less than the length of the array, indicating that there are no more bytes left to be read from the stream. The next read of the stream returns -1.

  If `length` is negative, or `length` is greater than the length of the array `value`, then an `IndexOutOfBoundsException` is thrown. No bytes will be read from the stream for this exception case.

  Parameters:
    `value` - the buffer into which the data is read
    `length` - the number of bytes to read; must be less than or equal to `value.length`
  Returns:
    the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached
  Throws:
    `JMSException` - if the JMS provider fails to read the message due to some internal error.
    `MessageNotReadableException` - if the message is in write-only mode.

### writeBoolean

    void writeBoolean(boolean value)
                      throws JMSException

  Writes a `boolean` to the bytes message stream as a 1-byte value. The value `true` is written as the value `(byte)1`; the value `false` is written as the value `(byte)0`.

  Parameters:
    `value` - the `boolean` value to be written
  Throws:
    `JMSException` - if the JMS provider fails to write the message due to some internal error.
    `MessageNotWriteableException` - if the message is in read-only mode.

### writeByte

    void writeByte(byte value)
                   throws JMSException

  Writes a `byte` to the bytes message stream as a 1-byte value.

  Parameters:
    `value` - the `byte` value to be written
  Throws:
    `JMSException` - if the JMS provider fails to write the message due to some internal error.
    `MessageNotWriteableException` - if the message is in read-only mode.

### writeShort

    void writeShort(short value)
                    throws JMSException

  Writes a `short` to the bytes message stream as two bytes, high byte first.

  Parameters:
    `value` - the `short` to be written
  Throws:
    `JMSException` - if the JMS provider fails to write the message due to some internal error.
    `MessageNotWriteableException` - if the message is in read-only mode.

### writeChar

    void writeChar(char value)
                   throws JMSException

  Writes a `char` to the bytes message stream as a 2-byte value, high byte first.

  Parameters:
    `value` - the `char` value to be written
  Throws:
    `JMSException` - if the JMS provider fails to write the message due to some internal error.
    `MessageNotWriteableException` - if the message is in read-only mode.

### writeInt

    void writeInt(int value)
                  throws JMSException

  Writes an `int` to the bytes message stream as four bytes, high byte first.

  Parameters:
    `value` - the `int` to be written
  Throws:
    `JMSException` - if the JMS provider fails to write the message due to some internal error.
    `MessageNotWriteableException` - if the message is in read-only mode.

### writeLong

    void writeLong(long value)
                   throws JMSException

  Writes a `long` to the bytes message stream as eight bytes, high byte first.

  Parameters:
    `value` - the `long` to be written
  Throws:
    `JMSException` - if the JMS provider fails to write the message due to some internal error.
    `MessageNotWriteableException` - if the message is in read-only mode.

### writeFloat

    void writeFloat(float value)
                    throws JMSException

  Converts the `float` argument to an `int` using the `floatToIntBits` method in class `Float`, and then writes that `int` value to the bytes message stream as a 4-byte quantity, high byte first.

  Parameters:
    `value` - the `float` value to be written
  Throws:
    `JMSException` - if the JMS provider fails to write the message due to some internal error.
    `MessageNotWriteableException` - if the message is in read-only mode.

### writeDouble

    void writeDouble(double value)
                     throws JMSException

  Converts the `double` argument to a `long` using the `doubleToLongBits` method in class `Double`, and then writes that `long` value to the bytes message stream as an 8-byte quantity, high byte first.

  Parameters:
    `value` - the `double` value to be written
  Throws:
    `JMSException` - if the JMS provider fails to write the message due to some internal error.
    `MessageNotWriteableException` - if the message is in read-only mode.

### writeUTF

    void writeUTF(java.lang.String value)
                  throws JMSException

  Writes a string to the bytes message stream using UTF-8 encoding in a machine-independent manner.

  For more information on the UTF-8 format, see "File System Safe UCS Transformation Format (FSS_UTF)", X/Open Preliminary Specification, X/Open Company Ltd., Document Number: P316. This information also appears in ISO/IEC 10646, Annex P.

  Parameters:
    `value` - the `String` value to be written
  Throws:
    `JMSException` - if the JMS provider fails to write the message due to some internal error.
    `MessageNotWriteableException` - if the message is in read-only mode.

### writeBytes

    void writeBytes(byte[] value)
                    throws JMSException

  Writes a byte array to the bytes message stream.

  Parameters:
    `value` - the byte array to be written
  Throws:
    `JMSException` - if the JMS provider fails to write the message due to some internal error.
    `MessageNotWriteableException` - if the message is in read-only mode.

### writeBytes

    void writeBytes(byte[] value,
                    int offset,
                    int length)
                    throws JMSException

  Writes a portion of a byte array to the bytes message stream.

  Parameters:
    `value` - the byte array value to be written
    `offset` - the initial offset within the byte array
    `length` - the number of bytes to use
  Throws:
    `JMSException` - if the JMS provider fails to write the message due to some internal error.
    `MessageNotWriteableException` - if the message is in read-only mode.

### writeObject

    void writeObject(java.lang.Object value)
                     throws JMSException

  Writes an object to the bytes message stream.

  This method works only for the objectified primitive object types (`Integer`, `Double`, `Long` ...), `String` objects, and byte arrays.

  Parameters:
    `value` - the object in the Java programming language ("Java object") to be written; it must not be null
  Throws:
    `JMSException` - if the JMS provider fails to write the message due to some internal error.
    `MessageFormatException` - if the object is of an invalid type.
    `MessageNotWriteableException` - if the message is in read-only mode.
    `java.lang.NullPointerException` - if the parameter `value` is null.

### reset

    void reset()
               throws JMSException

  Puts the message body in read-only mode and repositions the stream of bytes to the beginning.

  Throws:
    `JMSException` - if the JMS provider fails to reset the message due to some internal error.
    `MessageFormatException` - if the message has an invalid format.

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