Dear Jim,
Thank you very much for your reply.
I have tried to replace the method with the fixed version from Connector/J 5.0
as follows. The casting exception has disappeared. However, now I always
encounter below. This encoding should be the most common, right? But why this
happens. Thanks.
SQL Exception: Unsupported character encoding 'ISO8859_1'.
Best regards,
King Tin
//J2.1-fix start: Partially sync fixed method from Connector/J 5.0
SingleByteCharsetConverter getCharsetConverter(
String javaEncodingName) //throws SQLException {
{
if (javaEncodingName == null) {
return null;
}
/*if (this.usePlatformCharsetConverters) {
return null; // we'll use Java's built-in routines for
this
// they're finally fast enough
}*/
SingleByteCharsetConverter converter = null;
synchronized (this.charsetConverterMap) {
Object asObject = this.charsetConverterMap
.get(javaEncodingName);
if (asObject ==
CHARSET_CONVERTER_NOT_AVAILABLE_MARKER) {
return null;
}
converter = (SingleByteCharsetConverter)asObject;
if (converter == null) {
try {
converter =
SingleByteCharsetConverter.getInstance(
javaEncodingName);
//, this);
if (converter == null) {
this.charsetConverterMap.put
(javaEncodingName,
CHARSET_CONVERTER_NOT_AVAILABLE_MARKER);
} else {
this.charsetConverterMap.put
(javaEncodingName, converter);
}
} catch (UnsupportedEncodingException
unsupEncEx) {
this.charsetConverterMap.put
(javaEncodingName,
CHARSET_CONVERTER_NOT_AVAILABLE_MARKER);
converter = null;
}
}
}
return converter;
}
//J2.1-fix end: Sync fixed method from Connector/J 5.0
Quoting Jim White <[EMAIL PROTECTED]>:
> Lam King Tin wrote:
>
> > ...
> > SingleByteCharsetConverter converter = (SingleByteCharsetConverter)
> > this.charsetConverterMap.get(javaEncodingName);
> >
> > Do you know what's the reason of the casting exception and any manageable
> > solution? Thank you very much.
> >
> > Best regards,
> > King Tin
> >
> > SQL Exception: Unable to connect to any hosts due to exception:
> > java.lang.ClassCastException: can't cast `java/lang/Object' to
> > `com/mysql/jdbc/SingleByteCharsetConverter'
> >
> > ** BEGIN NESTED EXCEPTION **
> >
> > java.lang.ClassCastException
> > MESSAGE: can't cast `java/lang/Object' to
> > `com/mysql/jdbc/SingleByteCharsetConverter'
> >
> > STACKTRACE:
> >
> > java.lang.ClassCastException: can't cast `java/lang/Object' to
> > `com/mysql/jdbc/SingleByteCharsetConverter'
> > at
> com.mysql.jdbc.Connection.getCharsetConverter(Connection.java:2046)
>
> I don't know much about Kaffe, but the message makes clear that
> something odd has happened. Someone has put a plain "java.lang.Object"
> into the converter map under the encoding you're trying to use. It
> would seem to make a lot more sense that the encoding is missing than
> there would be an illegal object.
>
> It would probably be helpful to know which character encoding you're using.
>
> http://dev.mysql.com/downloads/connector/j/3.0.html
>
> mysql-connector-java-3.0.17-ga/com/mysql/jdbc/Connection.java
>
> Okay, I did a little (okay, a lot) more digging. Here's the relevant
> source:
>
> /**
> * Marker for character set converter not being available (not written,
> * multibyte, etc) Used to prevent multiple instantiation requests.
> */
> private final static Object CHARSET_CONVERTER_NOT_AVAILABLE_MARKER
> = new Object();
>
> ....
>
> synchronized SingleByteCharsetConverter getCharsetConverter(
> String javaEncodingName) {
> SingleByteCharsetConverter converter =
> (SingleByteCharsetConverter) this.charsetConverterMap
> .get(javaEncodingName);
>
> if (converter == CHARSET_CONVERTER_NOT_AVAILABLE_MARKER) {
> return null;
> }
>
> if (converter == null) {
> try {
>
> So they intended to detect missing encoding sets, but the logic is
> broken (the cast will always throw an exception before the test can be
> made). You could fix this code so that it returns null as intended on
> missing converters. I looked in the source for that same file in 5.0,
> and the above bug is fixed. Copy-and-pasting just that method might do
> the trick.
>
> http://dev.mysql.com/downloads/connector/j/5.0.html
>
> /**
> * Returns the locally mapped instance of a charset converter (to avoid
> * overhead of static synchronization).
> *
> * @param javaEncodingName
> * the encoding name to retrieve
> * @return a character converter, or null if one couldn't be mapped.
> */
> SingleByteCharsetConverter getCharsetConverter(
> String javaEncodingName) throws SQLException {
> if (javaEncodingName == null) {
> return null;
> }
>
> if (this.usePlatformCharsetConverters) {
> return null; // we'll use Java's built-in routines for
this
> // they're finally fast enough
> }
>
> SingleByteCharsetConverter converter = null;
>
> synchronized (this.charsetConverterMap) {
> Object asObject = this.charsetConverterMap
> .get(javaEncodingName);
>
> if (asObject ==
CHARSET_CONVERTER_NOT_AVAILABLE_MARKER) {
> return null;
> }
>
> converter = (SingleByteCharsetConverter)asObject;
>
> if (converter == null) {
> try {
> converter =
SingleByteCharsetConverter.getInstance(
> javaEncodingName,
this);
>
> if (converter == null) {
> this.charsetConverterMap.put
(javaEncodingName,
>
CHARSET_CONVERTER_NOT_AVAILABLE_MARKER);
> } else {
> this.charsetConverterMap.put
(javaEncodingName, converter);
> }
> } catch (UnsupportedEncodingException
unsupEncEx) {
> this.charsetConverterMap.put
(javaEncodingName,
>
CHARSET_CONVERTER_NOT_AVAILABLE_MARKER);
>
> converter = null;
> }
> }
> }
>
> return converter;
> }
>
>
>
> Also setting the character encoding to be one that is supported could
> help. If you need an unsupported character encoding then it could be
> added to Kaffe (probably the most difficult option).
>
> Jim
>
>
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