Exception in thread "main" java.io.EOFException while reading with objectInputStream

Question

I'm getting eofexception I tried to solve it but didn't find an answer it is giving exception in ObjectInputStream line please help me out.

public class SearchIndex extends ObjectOutputStream {
  static Map<String, List<String>> map = new HashMap<String, List<String>>();

  public SearchIndex(OutputStream out) throws IOException {
    super(out);
 }

  public static void readIndex() throws FileNotFoundException, IOException, ClassNotFoundException {

     // create an ObjectInputStream for the file we created before
    File file = new File("res/searchIndex.txt");
    FileInputStream fis = new FileInputStream(file);
    ObjectInputStream ois = new ObjectInputStream(fis);

    System.out.println(ois.readObject());
    // read and print an int
    map =  (Map<String, List<String>>) ois.readObject();
    System.out.println(map);
    ois.close();
  }

help me solve this problem

Answer: When the input file is empty the FileInputStream will return -1 as output so, check if (fis != -1 ) then go further... because of FileInputStream returning me -1 the EOF exception is occurring .... hope this will help you. — sreenath sirimala
– sreenath sirimala, Commented Oct 16, 2015 at 16:45

Rahman · Accepted Answer · 2015-10-09 12:33:41Z

3

Its an expected behavior, ois.readObject() reached end of the file and couldnt fine anything further. Handle it inside a try catch block

edited Oct 9, 2015 at 12:33

answered Oct 9, 2015 at 8:48

Rahman

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1 Comment

sreenath sirimala Over a year ago

Thanks for the answer, but I'm getting exception at creating ObjectInputStream object;

Ashish Patil · Accepted Answer · 2015-10-09 12:52:49Z

1

The error is only because your file at location res/searchIndex.txt is empty.

Check if you have any data in your file..

Moreover, since you used ObjectInputStream, your text content won't get converted automatically into bytes. If you are using readObject() for reading; then you have to use writeObject() for writing contents into file.

answered Oct 9, 2015 at 12:52

Ashish Patil

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3 Comments

sreenath sirimala Over a year ago

Thank you for reply, Yes, my file is empty. I got over the effect by checking the readInt() is -1 or not. As you said , I used readObject() and writeObject() but the writeObject is writing some dump into the file. thanks in advance

sreenath sirimala Over a year ago

I am developting simple search index; sample file entries look like this: keyword: url1, url2, url3; keyword1: url2, url4; help me @Ashish

Ashish Patil Over a year ago

requesting you to open new question if you required any other assistance . also if your above exception is resolved ; can you accept it and close this question?

Megh Vidani · Accepted Answer · 2015-10-09 09:05:11Z

-1

You need to explicitly cast the object to String.

Use

 System.out.println((String) ois.readObject());

And it should work.

answered Oct 9, 2015 at 9:05

Megh Vidani

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5 Comments

sreenath sirimala Over a year ago

Thanks for the answer, the exception is not printing the object, but I'm getting exception at creating ObjectInputStream object;

Megh Vidani Over a year ago

@sreenathsirimala okay... where and how are you using the writeObject method in your code? can you please post it here?

sreenath sirimala Over a year ago

I have removed entire logic and written on my own @megh vidani thanks for reply

Megh Vidani Over a year ago

If you have solved the issue, It would be great if you could share your own way of solving it so that it can help someone in the future. :)

sreenath sirimala Over a year ago

I have added the answer in a comment :-) thanks for suggestion .@megh

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