I hope somebody put this in a faq or the like...
Title: what happens when you implements a MailRepository under OracleDb
Refers to: James 1.2.*, Oracle Server 9i (perhaps 8i and others)
Subtitle: something went wrong, but I can't put my finger on it...
Step to replicate:
- first install james 1.2* and test everything is ok;
- then create the schema (lets say JAMES) and the table Message in the Db,
as sketched with mySql example;
- then change the repository def (I forgot the steps at home, but cutting &
pasting
the mySql defs basically works);
- finally rerun james: even though evrytng is ok, deamon crashed in a weird
way,
with the weirder exception:
2002.01.24 10:13:34 086 Channel default opened loading broker properties
from file:/var/maildatabase com.workingdogs.town.DataSetException: Error
retrieving primary keys from table
jamesusers: Unable to retrieve primary keys on table jamesusers
at com.workingdogs.town.ConnDefinition.getSchema
What happend?:
James uses Town lib to serialize messages from / to db: Town knows there is
a table called
"Messages" to analyze before operating: the analysis looks for:
- the type and name of columns;
- the primary key(s);
Introspection is done via getDatabaseMetaData(), but the Oracle
implementation is faulty:
IF you CREATE TABLE MESSAGE(), then the catalog contains an entry MESSAGE
and getDatabaseMetaData() returns data as expected;
IF you CREATE TABLE Message(), then the catalog contains an entry MESSAGE
and getDatabaseMetaData() doesn't find the table and returns empty data;
IF at this point you're rather confused and thinks there's something rotten,
you should
re-read the above sentences thrice and accept as a fact of life:
according to Oracle Support this is *NOT* a bug, instead that's exactly the
logical behaviour (and I'd known it better and not bugged people that
works...).
Finally the solution (by dany, which is me):
you cannot change James and you cannot touch Town, and you
cannot force Oracle to support logic, but you can:
open sqlplus james/james@sid_your_db:
CREATE TABLE MESSAGES(ETC);
CREATE SYNONYM "Messages" FOR MESSAGES;
SELECT * FROM CAT;
-- you should see 2 entries: the first UPPERCASE, the second MixedCase;
COMMIT; -- it always helps;
exit sqlplus;
rerun all the testbed and james: it should work:
hope it helps,
d.
-----Messaggio originale-----
Da: Raghavender Rao [mailto:[EMAIL PROTECTED]]
Inviato: gioved� 24 gennaio 2002 6.25
A: [EMAIL PROTECTED]
Oggetto: PLease Help Me!!!
hi ther,
I am trying to install JAMES with users repositories stored in
Oracle.Connection eshtablished successfully.But when i try to adduser or
listusers it gives me following Exception..
--------------------------------------------
2002.01.24 10:13:34 086 Channel default opened
loading broker properties from file:/var/maildatabase
com.workingdogs.town.DataSetException: Error retrieving primary keys from
table
jamesusers: Unable to retrieve primary keys on table jamesusers
at
com.workingdogs.town.ConnDefinition.getSchema(ConnDefinition.java:227
)
at com.workingdogs.town.TableDataSet.<init>(TableDataSet.java:299)
at com.workingdogs.town.TableDataSet.<init>(TableDataSet.java:280)
at
org.apache.james.userrepository.UsersTownRepository.countUsers(UsersT
ownRepository.java:171)
at
org.apache.james.remotemanager.RemoteManager.parseCommand(RemoteManag
er.java:195)
at
org.apache.james.remotemanager.RemoteManager.parseRequest(RemoteManag
er.java:117)
at
org.apache.avalon.blocks.serversocket.ServerSocketAcceptor.run(Server
SocketAcceptor.java:77)
at org.apache.avalon.utils.recycle.pool.Worker.run(Worker.java:113)
-----------------------------
table has primary keys but still error.
still to add
in com.workingdogs.town.ConnDefinition class and method getSchema();
------------------------------------------------------
1. KeyDef keydef = new KeyDef();
2. try
3. {
4. Connection connection1 = getConnection();
5. try
6. {
7. DatabaseMetaData databasemetadata =
connection1.getMetaData();
8. ResultSet resultset1;
9. for(resultset1 =
databasemetadata.getPrimaryKeys(connection1.getCatalog(), null, s);
resultset1.next(); keydef.addAttrib(resultset1.getString("COLUMN_NAME")));
10. resultset1.close();
11. if(keydef.size() == 0) // this is the cause of
the error.....
12. throw new DataSetException("Unable to retrieve
primary keys on table " + s);
13. schema.setDefaultKeyDef(keydef);
14. schemas.put(s, schema);
15. }
16. catch(Exception exception2)
17. {
18. throw new DataSetException("Error retrieving primary
keys from table " + s + ": " + exception2.getMessage());
19. }
20. releaseConnection(connection1);
21. }
22. catch(Exception exception1)
23. {
24. if(exception1 instanceof DataSetException)
25. throw (DataSetException)exception1;
26. else
27. throw new DataSetException("Error retrieving schema
info for table " + s + ": " + exception1.getMessage());
28. }
29. }
-----------------------------------------------------
Line 11 is causing ERROR!!! the size of keydef is 0
and i wrote a small program to test this....
-----------------------------------------------------
try {
java.sql.DriverManager.registerDriver(new
oracle.jdbc.driver.OracleDriver());
int i=0;
java.lang.String s = "jamesusers";
java.sql.Connection connection =
java.sql.DriverManager.getConnection("mydatabaseurl","username","password");
java.sql.Statement statement = connection.createStatement();
java.sql.DatabaseMetaData databasemetadata =
connection.getMetaData();
java.sql.ResultSet resultset;
resultset =
databasemetadata.getPrimaryKeys(connection.getCatalog(),null,s);
java.lang.System.out.println("The Value of ResultSet is
"+resultset.next());
/*while(resultset.next()){
java.lang.System.out.println("The coloums are
"+resultset.getString("COLUMN_NAME"));
}*/
}catch(java.lang.Exception exception){
exception.printStackTrace();
}
-----------------------------------------------------
The output of this program is :
The Value of ResultSet is false
I tried with different tables which has primary keys but the output is
same...
Please help me to solve this problem as soon as possible.
Rao
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