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From "Vladimir Ivanov (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-54) java.io.BufferedReader.read(null,int off,int len) does not throw NPE when len==0
Date Mon, 30 Jan 2006 07:20:33 GMT
java.io.BufferedReader.read(null,int off,int len) does not throw NPE when len==0
--------------------------------------------------------------------------------

         Key: HARMONY-54
         URL: http://issues.apache.org/jira/browse/HARMONY-54
     Project: Harmony
        Type: Bug
  Components: Classlib  
    Reporter: Vladimir Ivanov


In java.io package description j2se 1.4.2 specification says, that unless otherwise noted,
passing a null argument to a constructor or method in any class or interface in this package
will cause a NullPointerException to be thrown. 
But java.io.BufferedReader.read(null,int off,int len) does not throw NPE when len==0

Code to reproduce:
import java.io.*; 
  
public class test29 { 
    public static void main(String[] args)  {
	char []ch = {}; 
	char [] s = null; 
	BufferedReader toRet = new BufferedReader(new CharArrayReader(ch)); 
	try { 
		System.out.println("read(s, 1, 0)=  " + toRet.read(s, 1, 0)); 
	} catch (Exception t) { 
		System.out.println("Exception: " + t); 
	} 
	try { 
		System.out.println("read(s, 1, 1)=  " + toRet.read(s, 1, 1)); 
	} catch (Exception t) { 
		System.out.println("Exception: " + t); 
	} 
   } 
}  

Steps to Reproduce: 
1. Build Harmony (check-out on 2006-01-30) j2se subset as described in README.txt. 
2. Compile test29.java using BEA 1.4 javac 
> javac -d . test29.java 
3. Run java using compatible VM (J9) 
> java -showversion test29


Output:
C:\tmp\tmp17>C:\jrockit-j2sdk1.4.2_04\bin\java.exe -showversion test29
java version "1.4.2_04"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_04-b05)
BEA WebLogic JRockit(TM) 1.4.2_04 JVM  (build ari-31788-20040616-1132-win-ia32, Native Threads,
GC strategy: parallel)

Exception: java.lang.NullPointerException
Exception: java.lang.NullPointerException

C:\tmp\tmp17>C:\harmony\trunk\deploy\jre\bin\java -showversion test29
java version 1.4.2 (subset)

(c) Copyright 1991, 2005 The Apache Software Foundation or its licensors, as applicable.
read(s, 1, 0)=  0
Exception: java.lang.NullPointerException

C:\tmp\tmp17>
junit test:
------------------------ BufferedReaderTest.java -------------------------------------------------
import java.io.*; 
import junit.framework.*; 
  
public class BufferedReaderTest extends TestCase { 
    public static void main(String[] args) { 
        junit.textui.TestRunner.run(BufferedReaderTest.class); 
    } 

    public void testHashCode() { 
	char []ch = {}; 
	BufferedReader toRet = new BufferedReader(new CharArrayReader(ch)); 
	try { 
		toRet.read(null, 1, 0);
		fail("NullPointerException expected");
	} catch (NullPointerException e) {
	} catch (Exception e) { 
		fail("Unexpected exception: " + e); 
	} 
    }
} 



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