Read file

I try to read the content of file text.txt. The size of this file is
26 Mb. And always I have the error:

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
    at java.util.Arrays.copyOf(Arrays.java:2882)
    at java.lang.AbstractStringBuilder.expandCapacity
(AbstractStringBuilder.java:100)
    at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:
390)
    at java.lang.StringBuffer.append(StringBuffer.java:224)

at lines contents.append(text).append(System.getProperty
("line.separator"));

How can I read and save the content of file. The content of file I
need then in the program to show it in some dialog.

public static void main(String[] args) {
        File file = new File("D:\\work\\text.txt");
        StringBuffer contents = new StringBuffer();
        BufferedReader reader = null;

        try {
            reader = new BufferedReader(new FileReader(file));
            String text = null;

            // repeat until all lines is read
            while ((text = reader.readLine()) != null)
            {
                contents.append(text).append(System.getProperty
("line.separator"));
            }
        } catch (FileNotFoundException e)
        {
            e.printStackTrace();
        } catch (IOException e)
        {
            e.printStackTrace();
        } finally
        {
            try
            {
                if (reader != null)
                {
                    reader.close();
                }
            } catch (IOException e)
            {
                e.printStackTrace();
            }
        }

        // show file contents here
        System.out.println(contents.toString());
    }