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From "Tim Ellison (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (HARMONY-54) java.io.BufferedReader.read(null,int off,int len) does not throw NPE when len==0
Date Tue, 07 Feb 2006 12:08:58 GMT
     [ http://issues.apache.org/jira/browse/HARMONY-54?page=all ]

Tim Ellison reassigned HARMONY-54:
----------------------------------

    Assign To: Tim Ellison

> 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
>     Assignee: Tim Ellison
>  Attachments: BufferedReaderTest.java
>
> 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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