[HARMONY-6649] String.toLowerCase/toUpperCase incorrect for supplementary characters

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 5.0M15
• Fix Version/s: 5.0M15
• Component/s: Classlib
• Assignee: Tim Ellison
• Reporter: Robert Muir
• Created: 14/Sep/10 20:12
• Updated: 24/Sep/10 06:39
• Resolved: 24/Sep/10 06:39

Description

Simple testcase:

    assertEquals("\uD801\uDC44", "\uD801\uDC1C".toLowerCase());

Looking at modules/luni/src/main/java/java/lang/String.java, the problem is these methods iterate code units (char) not codepoints (int),
and use Character.toLowerCase(char) and Character.toUpperCase(char), instead of Character.toLowerCase(int), and Character.toUpperCase(int)