@ Executing the following code in the BeanShell running on the JVM: 
@ . 
@ bsh% import java.nio.charset.Charset; 
@ bsh% final String CS_JIS0212 = "JIS0212"; 
@ bsh% System.out.println(Charset.isSupported(CS_JIS0212) ? "Issupported" 
@                                                        : "Not
supported"); 
@ bsh% Charset cs = Charset.forName(CS_JIS0212); 
@ bsh% System.out.println(cs.canEncode() ? "Can encode" : "Cannot encode");

@ . 
@ Gives the following output: 
@ . 
@ bsh % Is supported 
@ bsh % Can encode 
@ . 
@ However, 
@ . 
@ bsh% String.valueOf('a').getBytes("JIS0212"); 
@ . 
@ gives: 
@ . 
@ java.lang.IllegalArgumentException: Illegal replacement 
@        at 
@ java.nio.charset.CharsetEncoder.replaceWith(CharsetEncoder.java:262) 
@        at java.nio.charset.CharsetEncoder.<init>(CharsetEncoder.java:180)

@        at java.nio.charset.CharsetEncoder.<init>(CharsetEncoder.java:203)

@        at
sun.nio.cs.ext.DoubleByteEncoder.<init>(DoubleByteEncoder.java:31) 
@        at sun.nio.cs.ext.JIS_X_0212$Encoder.<init>(JIS_X_0212.java:63) 
@        at sun.nio.cs.ext.JIS_X_0212.newEncoder(JIS_X_0212.java:34) 
@        at java.lang.StringCoding$CharsetSE.<init>(StringCoding.java:317) 
@        at java.lang.StringCoding$CharsetSE.<init>(StringCoding.java:308) 
@        at java.lang.StringCoding.encode(StringCoding.java:365) 
@        at java.lang.String.getBytes(String.java:573) 
@ .



Or a simpler test case:

@Using the JDK1.4.2_04 JVM running on Windows 2000 (SP4), executing the 
@ following line of code: 
@ . 
@  "a".getBytes("JIS0212"); 
@ . 
@ results in the following exception: 
@ . 
@  java.lang.IllegalArgumentException: Illegal replacement 
@        at 
@ java.nio.charset.CharsetEncoder.replaceWith(CharsetEncoder.java:262) 
@        at java.nio.charset.CharsetEncoder.<init>(CharsetEncoder.java:180)

@        at java.nio.charset.CharsetEncoder.<init>(CharsetEncoder.java:203)

@        at
sun.nio.cs.ext.DoubleByteEncoder.<init>(DoubleByteEncoder.java:31) 
@        at sun.nio.cs.ext.JIS_X_0212$Encoder.<init>(JIS_X_0212.java:63) 
@        at sun.nio.cs.ext.JIS_X_0212.newEncoder(JIS_X_0212.java:34) 
@        at java.lang.StringCoding$CharsetSE.<init>(StringCoding.java:317) 
@        at java.lang.StringCoding$CharsetSE.<init>(StringCoding.java:308) 
@        at java.lang.StringCoding.encode(StringCoding.java:365) 
@        at java.lang.String.getBytes(String.java:573) 
@ . 
@ Using JIS0208 also fails in a similar way.