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Unicode messages in oracle raise_application_error

I am working on enabling globalization support in my DB.
I have done migrating character set to UTF (AL16UTF16).
After migration, I can pass Unicode characters from Java to Oracle and store in table's NVARCHAR2 column. Also I can retrieve from DB and pass to Java.
But, If I do a raise_application_error with the Unicode data. It sends the error message to java like below
; nested exception is java.sql.SQLException: ORA-20001: ¿¿¿ ¿¿¿¿¿¿¿¿¿
Can anyone tell me what's wrong? and how can I get the Unicode error messages in java?
Thanks in advance.

The problem is I have done character set migration using the below steps, but it doesn't work for me.
1.Backup the database.
2.Run CSSCAN command.
3.Restart the DB with RESTRICT mode.
4.Run CSALTER script.
5.Restart the DB.
After that I have tried using the below steps.
1.Take backup of the DB using expdp command.
2.Create a new database with required character set (Unicode AL32UTF8).
3.Import the backup dump file into the newly created DB.
That's all. It works!
Now I don't need to use NVARCHAR2 data type to store unicode data (VARCHAR2 itself stores Unicode). raise_application_error also works fine (sends error messages with Unicode data to Java).
Thanks.

Set Google Cloud SQL character-set-server

I'd like to use Google Cloud SQL for my app, but I require that utf8mb4 be set as the server character set in order to correctly process 4 byte utf8 characters (emoji).
It is not enough to simply set the table or database character set because the driver connection (mysql-connector-java) is negotiated based on the server character set.
Is it possible to set the server character set with Cloud SQL?
If not, is there another workaround that could allow me to force the driver connection to utf8mb4?
Here is a copy of my connection string: jdbc:mysql://<host>/<db_name>?useUnicode=true&characterEncoding=utf-8
Note that setting the characterEncoding variable in the driver connection string to utf-8mb4 or utf8mb4 is illegal. My best information say that it has to be set to utf-8 and then it will upgrade to utf8mb4 if the server is using that character set.

It looks like this feature has been added to the new instance menu on the console as of 5/29/2014. There is now a "character_set_server" flag that can be set to either utf8 or utf8mb4.
This does not allow setting the server character set to any arbitrary character set, but it does solve my problem and should suffice for most people.

UTF-8 Queries with JDBC

i want to ask the MYSQL an UTF-8 Query but it does not work fine . when i try the following query , the result comes up truly :
String query = "select * from Terms where Term = 'lol'";
but with the following query doesn't make a response :
String query = "select * from Terms where Term = 'خدابخش'";
where the
'خدابخش'
part is in Persian and UTF-8 .
note that the connection to the database is fine .

Chances are that you may need to set your character encoding in your JDBC connection. If you are using MySQL JDBC Connector you do it using the property characterEncoding. Somewhat like this:
jdbc:mysql://localhost/some_db?useUnicode=yes&characterEncoding=UTF-8
You may want to read the reference on encoding and character sets in your connector JDBC documentation.
This is the one that mentions the use of characterEncoding for the MySQL JDBC Connector:
Connector JDBC: Using Character Sets and Unicode

One or more of the following is true:
The Java compiler, compiling your code, is set to read the source file with a different encoding in which the source file was actually stored. In other words, there is a discrepancy between the encoding that your editor uses, the encoding in which the file is actually saved, and the encoding with which the Java compiler is reading your source code.
Your database isn't set correctly to accept/store Unicode characters. Ensure that your database is set correctly. Looks like you're using MySQL. You may want to create a dump of the database using mysqldump and witness how the database was created with respect to character sets.

Execute Mysql query contains chinese character using java program

When I execute SQL query contains chines character, the query is executed successfully. When I open the mysql query browser I could see only ???? instead of Chinese texts. If the same query executed from the mysql query browser it works fine.

Try connecting with following switch
String url = "jdbc:mysql://host/database?characterSetResults=UTF-8&characterEncoding=UTF-8&useUnicode=yes";

All encoding must be the same (there are exceptions but let's forget them): the encoding used by the DB, the connection encoding use by the Java process and the one used by the query browser. You need to change the one used by Java, since the other two seem to be OK.

ms sql2000 arabic problem

I hava a table in ms sql2000 with a column defined as nvarchar
when query this table in java i get data for this column like this :
يا هلا بالشباب الحلوين يا شباب ا٠شلونكو؟.
When i try php with adodb i get the data as it should be ,in arabic.
but i need to use java not php ,please can any one help me.
i use a normal sql statement "select * from news"
i use the latest Microsoft jdbc driver(sqljdbc4.jar).
i have no direct access to the sql server.

That looks to me like an encoding issue, make sure you're using the proper encoding in Java to get the text back. Some variant of unicode obviously.

At every character processing step (getting data, modifying data, saving data, displaying data, etcetera) ensure that you're using UTF-8 character encoding.
If it is a client application, you usually only have to worry about it in the database table and if necessary also the JDBC connection string.
If it is a webapplication, then you need to take more into account: request and response encoding. For GET requests this is an appserver setting and for POST requests and all responses you can set it in the appropriate request/response objects.