OptionalDataException in Java

java.io.OptionalDataException

Exception indicating the failure of an object read operation due to unread primitive data, or the end of data belonging to a serialized object in the stream.

This exception may be thrown in two cases:

1. An attempt was made to read an object when the next element in the stream is primitive data. In this case, the OptionalDataException'slength field is set to the number of bytes of primitive data immediately readable from the stream, and the eof field is set to false.

2. An attempt was made to read past the end of data consumable by a class-defined readObject or readExternal method. In this case, the theOptionalDataException's eof field is set to true, and the length field is set to 0.

Example

Java

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.OptionalDataException;

public class ObjectInputStreamreadObject {
    public static void main(String[] args) throws IOException {

        InputStream in = new FileInputStream("D:\\hello.txt");
        ObjectInputStream objectInputStream = new ObjectInputStream(in);

        try {
            System.out.println(objectInputStream.readObject());
        } catch (ClassNotFoundException e) {
            System.out.println("ClassNotFoundException occurs");
        } catch (OptionalDataException e) {
            System.out.println("OptionalDataException occurs");
        } catch (IOException e) {
            System.out.println("IOException occurs");
        }
        objectInputStream.close();

    }
}

Output:

OptionalDataException occurs

Some other Exceptions of java.io

EOFException: Signals that an end of file or end of the stream has been reached unexpectedly during input.

FileNotFoundException: Signals that an attempt to open the file denoted by a specified path name has failed.

InterruptedIOException: Signals that an I/O operation has been interrupted. 

InvalidClassException: Thrown when the Serialization runtime detects.

InvalidObjectException: Indicates that one or more deserialized objects failed validation tests.

IOError: Thrown when a serious I/O error has occurred.

IOException: Signals that an I/O exception of some sort has occurred.

NotActiveException: Thrown when serialization or deserialization is not active.

NotSerializableException: Thrown when an instance is required to have a Serializable interface.

ObjectStreamException: Superclass of all exceptions specific to Object Stream classes.

StreamCorruptedException: Thrown when control information that was read from an object stream violates internal consistency checks.

SyncFailedException: Signals that a sync operation has failed.

UncheckedIOException: Wraps an IOException with an unchecked exception.

UnsupportedEncodingException: Character Encoding is not supported.

UTFDataFormatException: Signals that a malformed string in modified UTF-8 format has been read in a data input stream or by any class that implements the data input interface.

WriteAbortedException: Signals that one of the ObjectStreamExceptions was thrown during a write operation.