Re: UTF8 is a better option than US-ASCII for the default encoding of PGStream

Hi,all

The problem I encountered is that,when lc_messages = 'ja_JP.UTF-8' is set in postgresql.conf,and initial connection to database server failed(for example:user name,password or dbname is misspelled),I see garbled error message text in the client .The reason is that,in PGStream constrcutor,default encoding of ASCII is set(Encoding.getJVMEncoding("US-ASCII")).For the following reasons,maybe UTF8 is a better option for default encoding.

1.When initializing connection ,jdbcclient send client_encoding parameter as UTF-8

 see org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(HostSpec[], String, String, Properties, Logger)

2. When initial connection to server completes,jdbc client only receive the value for client_encoding as UTF-8 

 see org.postgresql.core.v3.ConnectionFactoryImpl.readStartupMessages(PGStream, ProtocolConnectionImpl, Logger)

if (name.equals("client_encoding"))

                {

                    if (!value.equals("UTF8"))

                        throw new PSQLException(GT.tr("Protocol error.  Session setup failed."), PSQLState.PROTOCOL_VIOLATION);

                    pgStream.setEncoding(Encoding.getDatabaseEncoding("UTF8"));

                }

So there seems no reason to initiate the encoding as US-ASCII.

Best regards.

Chao.