Throws IllegalArgumentException when use BufferedReader.readLine()

Question

hi
when i use BufferedReader.readLine() to read a html file of Internet,it throws IllegalArgumentException like blow:
java.lang.IllegalArgumentException
at java.nio.Buffer.position(Buffer.java:218)
at java.nio.charset.CharsetDecoder.decode(CharsetDecoder.java:575)
at sun.nio.cs.StreamDecoder$CharsetSD.implRead(StreamDecoder.java:442)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:182)
at java.io.InputStreamReader.read(InputStreamReader.java:167)
at java.io.BufferedReader.fill(BufferedReader.java:136)
at java.io.BufferedReader.readLine(BufferedReader.java:299)
at java.io.BufferedReader.readLine(BufferedReader.java:362)
but it occured sometimes or occured never in a long time!
Why?

Answer 1

It does it because of this bit of code in java.nio.Buffer.position
if ((newPosition < 0) || (newPosition > limit))
      throw new IllegalArgumentException ();So for some reason a bit of the java code has tried to set the position to either less than zero or greater than the limit of the buffer. Not a good idea in either case.
Since this is not your code you can't really do much about it. Try catching the exception and handling it.