Subject Re: [Firebird-Java] Firebird table field problem
Author David Jencks
1. redesign your application architecture so the object <> table mapping is
more pluggable and determined by metadata

2. See if you can use quoted field names everywhere, e.g. "password".
You'll need dialect 3 for sure. You might be able just to quote reserved
words, depending on how skillful you are at writing program
transformations.

david jencks

On 2002.04.16 21:38:36 -0400 Sanjay Amatya wrote:
> I have a field name 'password' in a table X. During conversion from
> Access table,
> the field name was automatically converted to 'passwordcol'. Looks like
> Firebird
> doesn't allow 'password' as field name. I have an existing Java
> application with
> more than a thousand classes, with complex relationships, and database
> tables mapped
> as java objects. This makes it very difficult to change the field name in
> Java app
> itself. What could be the best solution in such a situation? Any
> thoughts?
>
> Thanks
>
> --- Firebird-Java@yahoogroups.com wrote:
> >
> > To unsubscribe from this group, send an email to:
> > Firebird-Java-unsubscribe@yahoogroups.com
> >
> >
> > ------------------------------------------------------------------------
> >
> > There are 16 messages in this issue.
> >
> > Topics in this digest:
> >
> > 1. problems on linux...
> > From: Marczisovszky Daniel <marczi@...>
> > 2. Re: problems on linux...
> > From: David Jencks <davidjencks@...>
> > 3. Result Set not returning all rows
> > From: <kenr@...>
> > 4. Re: problems on linux...
> > From: "rrokytskyy" <rrokytskyy@...>
> > 5. Re[2]: problems on linux...
> > From: Marczisovszky Daniel <marczi@...>
> > 6. Re: Re: problems on linux...
> > From: Marczisovszky Daniel <marczi@...>
> > 7. Re[2]: Re: problems on linux...
> > From: Marczisovszky Daniel <marczi@...>
> > 8. Re: problems on linux...
> > From: "rrokytskyy" <rrokytskyy@...>
> > 9. other mailing lists
> > From: Marczisovszky Daniel <marczi@...>
> > 10. Re: Re: problems on linux...
> > From: Marczisovszky Daniel <marczi@...>
> > 11. Re: Result Set not returning all rows
> > From: "rrokytskyy" <rrokytskyy@...>
> > 12. Re: Re: problems on linux...
> > From: Marczisovszky Daniel <marczi@...>
> > 13. Re: problems on linux...
> > From: "rrokytskyy" <rrokytskyy@...>
> > 14. Re: Re: problems on linux...
> > From: Marczisovszky Daniel <marczi@...>
> > 15. New experiences with the no-update and deadlock bug!
> > From: Marczisovszky Daniel <marczi@...>
> > 16. Re: New experiences with the no-update and deadlock bug!
> > From: "rrokytskyy" <rrokytskyy@...>
> >
> >
> > ________________________________________________________________________
> > ________________________________________________________________________
> >
> > Message: 1
> > Date: Sat, 13 Apr 2002 01:22:35 +0200
> > From: Marczisovszky Daniel <marczi@...>
> > Subject: problems on linux...
> >
> > Hi,
> >
> > Well, hm... I have serious problem again. The happens only on Linux. I
> > have tested with both Classic and Superserver on a Debian Potato and
> > on a Suse 7.2 with same results. The same is happening with both
> > Interclient and the latest type4 driver.
> >
> > I get a connection and starts reading a record from it, periodically,
> > but always on the same connection. If I change that record from isql,
> > nothing happens, I still get the previous value for that record. I've
> > also tried IBConsole but that did not help either. The interesting
> > thing I tried QuickDesk and If I change the record with that, then I
> > get the new value in the java program. I tried also with FIBPlus in
> > Delphi (QuickDesk also uses FIBPlus) but the java still shows the
> > previous value.
> >
> > I have attached a little example application. It reads the first
> > record from test table in every 3 seconds always with the same
> > connection. (I have tried both autocommit and non-autocommit, but none
> > of them worked).
> >
> > It runs an infinite loop. While it prints it the first record, try to
> > change that in isql or with IBConsole, and check if you see the new
> > value or not. I don't see the change.
> >
> > I know that probably this is not a bug a driver, but I'm not sure,
> > although I can't reproduce it on Windows. Does the driver contains any
> > platform-specific part?
> >
> > If I change the value from java (e.g. I start a separate java program)
> > then it works, it shows the new value.
> >
> > Is there any special isolation level for isql and IBConsole I missed?
> >
> > Please help, if you can! I really don't know how to cope with this.
> >
> > Best wishes,
> > Daniel
> >
> > // same database as last time, so only it has an id, username and
> > // passwd field
> >
> > import java.sql.*;
> > import java.util.*;
> >
> > public class conn {
> > public static void main( String[] args ) {
> > try {
> > Class.forName("org.firebirdsql.jdbc.FBDriver");
> > String url =
> > "jdbc:firebirdsql:localhost/3050://opt/interbase/test.gdb";
> > //String url =
> > "jdbc:firebirdsql:localhost/3050:/programs/develop/firebird/test.gdb";
> >
> > // we a get a connection
> > Connection conn = DriverManager.getConnection(url,
> "sysdba",
> > "masterkey");
> > while (true) {
> > Statement st = conn.createStatement();
> > ResultSet rs = st.executeQuery("select username from
> test");
> > rs.next();
> > System.out.println(rs.getString(1));
> > // wait 3 seconds and try again
> > try {
> > Thread.sleep(3000);
> > }
> > catch (Exception ee) {}
> > }
> > }
> > catch(ClassNotFoundException e) {
> > System.err.println("Couldn't load the driver: " +
> e.getMessage());
> > }
> > catch(SQLException e) {
> > System.err.println("SQLException caught: " +
> e.getMessage());
> > }
> > finally {
> > }
> > }
> > }
> >
> >
> >
> > ________________________________________________________________________
> > ________________________________________________________________________
> >
> > Message: 2
> > Date: Fri, 12 Apr 2002 19:43:58 -0400
> > From: David Jencks <davidjencks@...>
> > Subject: Re: problems on linux...
> >
> > I ran into this a long time ago and never found a solution except not
> to
> > use isql. I have no idea what is causing this. As you say, sticking
> > entirely to the java drivers seems to work ok. I think closing isql
> may
> > also make the changes visible??
> >
> > david jencks
> >
> > On 2002.04.12 19:22:35 -0400 Marczisovszky Daniel wrote:
> > > Hi,
> > >
> > > Well, hm... I have serious problem again. The happens only on Linux.
> I
> > > have tested with both Classic and Superserver on a Debian Potato and
> > > on a Suse 7.2 with same results. The same is happening with both
> > > Interclient and the latest type4 driver.
> > >
> > > I get a connection and starts reading a record from it, periodically,
> > > but always on the same connection. If I change that record from isql,
> > > nothing happens, I still get the previous value for that record. I've
> > > also tried IBConsole but that did not help either. The interesting
> > > thing I tried QuickDesk and If I change the record with that, then I
> > > get the new value in the java program. I tried also with FIBPlus in
> > > Delphi (QuickDesk also uses FIBPlus) but the java still shows the
> > > previous value.
> > >
> > > I have attached a little example application. It reads the first
> > > record from test table in every 3 seconds always with the same
> > > connection. (I have tried both autocommit and non-autocommit, but
> none
> > > of them worked).
> > >
> > > It runs an infinite loop. While it prints it the first record, try to
> > > change that in isql or with IBConsole, and check if you see the new
> > > value or not. I don't see the change.
> > >
> > > I know that probably this is not a bug a driver, but I'm not sure,
> > > although I can't reproduce it on Windows. Does the driver contains
> any
> > > platform-specific part?
> > >
> > > If I change the value from java (e.g. I start a separate java
> program)
> > > then it works, it shows the new value.
> > >
> > > Is there any special isolation level for isql and IBConsole I missed?
> > >
> > > Please help, if you can! I really don't know how to cope with this.
> > >
> > > Best wishes,
> > > Daniel
> > >
> > > // same database as last time, so only it has an id, username and
> > > // passwd field
> > >
> > > import java.sql.*;
> > > import java.util.*;
> > >
> > > public class conn {
> > > public static void main( String[] args ) {
> > > try {
> > > Class.forName("org.firebirdsql.jdbc.FBDriver");
> > > String url =
> > "jdbc:firebirdsql:localhost/3050://opt/interbase/test.gdb";
> > > //String url =
> > "jdbc:firebirdsql:localhost/3050:/programs/develop/firebird/test.gdb";
> > >
> > > // we a get a connection
> > > Connection conn = DriverManager.getConnection(url,
> "sysdba",
> > > "masterkey");
> > > while (true) {
> > > Statement st = conn.createStatement();
> > > ResultSet rs = st.executeQuery("select username from
> > > test");
> > > rs.next();
> > > System.out.println(rs.getString(1));
> > > // wait 3 seconds and try again
> > > try {
> > > Thread.sleep(3000);
> > > }
> > > catch (Exception ee) {}
> > > }
> > > }
> > > catch(ClassNotFoundException e) {
> > > System.err.println("Couldn't load the driver: " +
> > > e.getMessage());
> > > }
> > > catch(SQLException e) {
> > > System.err.println("SQLException caught: " +
> e.getMessage());
> > > }
> > > finally {
> > > }
> > > }
> > > }
> > >
> > >
> > >
> > > To unsubscribe from this group, send an email to:
> > > Firebird-Java-unsubscribe@yahoogroups.com
> > >
> > >
> > >
> > > Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
> > >
> > >
> > >
> > >
> > >
> >
> >
> > ________________________________________________________________________
> > ________________________________________________________________________
> >
> > Message: 3
> > Date: Fri, 12 Apr 2002 23:51:16 EDT
> > From: <kenr@...>
> > Subject: Result Set not returning all rows
> >
> > Here is a test case. Unzip the file to your
> client-java\src\org\firebirdsql\jdbc
> > folder and then run build one-test -Dtest=CopyrightSymbol. I had to
> tweak my
> > build.xml to get the one-test target to work correctly. The test and
> log are
> > attached insize a zip file
> >
> > The test inserts four rows into a table. The third row contains a
> copyright
> > symbol. When I select * only two rows are returned and no exceptions
> are thrown.
> >
> > In my larger program - I get gds synchronzation exceptions when I try
> to close the
> > resultset and statements. I do not get these exceptions in the test
> case - but I
> > am able to recreate the problem where not all rows are returned.
> >
> >
> >
> > [This message contained attachments]
> >
> >
> >
> > ________________________________________________________________________
> > ________________________________________________________________________
> >
> > Message: 4
> > Date: Sat, 13 Apr 2002 07:47:00 -0000
> > From: "rrokytskyy" <rrokytskyy@...>
> > Subject: Re: problems on linux...
> >
> > > I ran into this a long time ago and never found a solution except
> > > not to use isql. I have no idea what is causing this. As you say,
> > > sticking entirely to the java drivers seems to work ok. I think
> > > closing isql may also make the changes visible??
> >
> > I also had such a problem and never solved it either (I was using
> > InterClient). Maybe you can try different transaction isolation level?
> >
> > Unfortunatelly I do not have Linux box to make new tests. Sorry.
> >
> > Best regards,
> > Roman Rokytskyy
> >
> >
> >
> > ________________________________________________________________________
> > ________________________________________________________________________
> >
> > Message: 5
> > Date: Sat, 13 Apr 2002 11:06:48 +0200
> > From: Marczisovszky Daniel <marczi@...>
> > Subject: Re[2]: problems on linux...
> >
> > DJ> I ran into this a long time ago and never found a solution except
> not to
> > DJ> use isql. I have no idea what is causing this.  As you say,
> sticking
> > DJ> entirely to the java drivers seems to work ok.  I think closing
> isql may
> > DJ> also make the changes visible??
> >
> > no. it does not help at all. this is not a problem of isql. I've also
> > tried with FIBPlus, IBX and ZeosLIB for Delphi and I could not update
> > the database with any of them.
> >
> > Well, while I was playing with it, I found a more serious issue:
> >
> > I've added close statements to my code, which is absolutely correct
> > according to the API.
> >
> > The original code was this
> >
> > Statement st = conn.createStatement();
> > ResultSet rs = st.executeQuery("select username from
> test");
> > rs.next();
> > System.out.println(rs.getString(1));
> > try {
> > Thread.sleep(2000);
> > }
> > catch (Exception ee) {}
> >
> > and replaced with this:
> >
> > Statement st = conn.createStatement();
> > ResultSet rs = st.executeQuery("select username from
> test");
> > rs.next();
> > System.out.println(rs.getString(1));
> > rs.close();
> > st.close();
> > try {
> > Thread.sleep(2000);
> > }
> > catch (Exception ee) {}
> >
> > So when I run this new test and I connect to the test.gdb (I only
> > connect, I do not issue any sql command) then the java test hangs up.
> > It stops, but I don't know where. I've attached the log file, the jave
> > test ran three iterations, so it read the first record three times.
> >
> > David, don't you know personally someone from FB developers who has
> > linux and may run this test? This is a joke, we can not have releases
> > of a database system with such issues. This means one can not manage
> > his database remotely, only with java. If it is the bug of Firebird,
> > then this is a quite serious issue and should be fixed as soon as it
> > is possible.
> >
> > It hangs up at a op_response according to the log, but I can not
> > interpret it.
> >
> > Roman, I you tell me what would be required on a linux box for
> > debugging, probably I could give an account. (although that linux box
> is
> > not mine, but I will try everything to solve this)
> >
> > If it is the bug of the driver, I'm sure we can find it out, we're
> > good :)
> >
> > Best wishes,
> > Daniel
> >
> > [This message contained attachments]
> >
> >
> >
> > ________________________________________________________________________
> > ________________________________________________________________________
> >
> > Message: 6
> > Date: Sat, 13 Apr 2002 11:08:10 +0200
> > From: Marczisovszky Daniel <marczi@...>
> > Subject: Re: Re: problems on linux...
> >
> > >> I ran into this a long time ago and never found a solution except
> > >> not to use isql. I have no idea what is causing this.  As you say,
> > >> sticking entirely to the java drivers seems to work ok.  I think
> > >> closing isql may also make the changes visible??
> >
> > r> I also had such a problem and never solved it either (I was using
> > r> InterClient). Maybe you can try different transaction isolation
> level?
> >
> > That was the first thing... :( Maybe this hang-up issue can help to
> > find it out...
> >
> > daniel
> >
> >
> >
> > ________________________________________________________________________
> > ________________________________________________________________________
> >
> > Message: 7
> > Date: Sat, 13 Apr 2002 11:25:29 +0200
> > From: Marczisovszky Daniel <marczi@...>
> > Subject: Re[2]: Re: problems on linux...
> >
> > I've also tried Interbase 6.01 open source edition, exactly the same
> > behaviour. Maybe someone at Borland? ....
> >
> > daniel
> >
> >
> >
> > ________________________________________________________________________
> > ________________________________________________________________________
> >
> > Message: 8
> > Date: Sat, 13 Apr 2002 10:19:06 -0000
> > From: "rrokytskyy" <rrokytskyy@...>
> > Subject: Re: problems on linux...
> >
> > > Well, while I was playing with it, I found a more serious issue:
> > >
> > > I've added close statements to my code, which is absolutely correct
> > > according to the API.
> > >
> > > The original code was this
> > >
> > > Statement st = conn.createStatement();
> > > ResultSet rs = st.executeQuery("select username
> > from test");
> > > rs.next();
> > > System.out.println(rs.getString(1));
> > > try {
> > > Thread.sleep(2000);
> > > }
> > > catch (Exception ee) {}
> > >
> > > and replaced with this:
> > >
> > > Statement st = conn.createStatement();
> > > ResultSet rs = st.executeQuery("select username
> > from test");
> > > rs.next();
> > > System.out.println(rs.getString(1));
> > > rs.close();
> > > st.close();
> > > try {
> > > Thread.sleep(2000);
> > > }
> > > catch (Exception ee) {}
> > >
> > > So when I run this new test and I connect to the test.gdb (I only
> > > connect, I do not issue any sql command) then the java test hangs
> > > up. It stops, but I don't know where. I've attached the log file,
> > > the jave test ran three iterations, so it read the first record
> > > three times.
> >
> > Most likely this is a deadlock. I had similar problems in my code,
> > and the only thing that I needed was to set the transaction isolation
> > to TRANSACTION_READ_COMMITED. Current default transaction isolation
> > is TRANSACTION_REPEATABLE_READ.
> >
> > > It hangs up at a op_response according to the log, but I can not
> > > interpret it.
> >
> > Same was in my case. Look for a deadlock.
> >
> > > Roman, I you tell me what would be required on a linux box for
> > > debugging, probably I could give an account. (although that linux
> > > box is not mine, but I will try everything to solve this)
> >
> > No, I meant that I'm not able to do this on the weekend, since the
> > only computer here I have is my laptop running Win2k. I will try to
> > test it at work next week.
> >
> > I will look into the code.
> >
> > Best regards,
> > Roman
> >
> >
> >
> > ________________________________________________________________________
> > ________________________________________________________________________
> >
> > Message: 9
> > Date: Sat, 13 Apr 2002 12:21:40 +0200
> > From: Marczisovszky Daniel <marczi@...>
> > Subject: other mailing lists
> >
> > Hi,
> >
> > I've tested this new java with close() calls, and it works perfectly
> > on Windows. I guess it is a bug of Interbase/Firebird on linux unless
> > the driver contains some platform-specific thing, I don't know.
> >
> > What other mailing list would you suggest to contact developers of
> > Firebird/Interbase?
> >
> > Best wishes,
> > Daniel
> >
> >
> >
> > ________________________________________________________________________
> > ________________________________________________________________________
> >
> > Message: 10
> > Date: Sat, 13 Apr 2002 12:25:25 +0200
> > From: Marczisovszky Daniel <marczi@...>
> > Subject: Re: Re: problems on linux...
> >
> > >> Well, while I was playing with it, I found a more serious issue:
> > >>
> > >> I've added close statements to my code, which is absolutely correct
> > >> according to the API.
> > >>
> > >> The original code was this
> > >>
> > >>                 Statement st = conn.createStatement();
> > >>                 ResultSet rs = st.executeQuery("select username
> > r> from test");
> > >>                 rs.next();
> > >>                 System.out.println(rs.getString(1));
> > >>                 try {
> > >>                   Thread.sleep(2000);
> > >>                 }
> > >>                 catch (Exception ee) {}
> > >>
> > >> and replaced with this:
> > >>                
> > >>                 Statement st = conn.createStatement();
> > >>                 ResultSet rs = st.executeQuery("select username
> > r> from test");
> > >>                 rs.next();
> > >>                 System.out.println(rs.getString(1));
> > >>                 rs.close();
> > >>                 st.close();
> > >>                 try {
> > >>                   Thread.sleep(2000);
> > >>                 }
> > >>                 catch (Exception ee) {}
> > >>
> > >> So when I run this new test and I connect to the test.gdb (I only
> > >> connect, I do not issue any sql command) then the java test hangs
> > >> up. It stops, but I don't know where. I've attached the log file,
> > >> the jave test ran three iterations, so it read the first record
> > >> three times.
> >
> > r> Most likely this is a deadlock. I had similar problems in my code,
> > r> and the only thing that I needed was to set the transaction
> isolation
> > r> to TRANSACTION_READ_COMMITED. Current default transaction isolation
> > r> is TRANSACTION_REPEATABLE_READ.
> >
> > Actually I don't much about difference between these, but it seems
> > soon I'll read as much as I can about it.
> >
> > >> It hangs up at a op_response according to the log, but I can not
> > >> interpret it.
> >
> > r> Same was in my case. Look for a deadlock.
> >
> > Fine, but why? I understand if I update from isql at java at the same
> > time. But the java is reading only and in isql I do *nothing*, I just
> > typed "connect /opt/interbase/test.gdb;".
> >
> > Moreover it works fine on Windows.
> >
> > Daniel
> >
> >
> >
> > ________________________________________________________________________
> > ________________________________________________________________________
> >
> > Message: 11
> > Date: Sat, 13 Apr 2002 10:29:13 -0000
> > From: "rrokytskyy" <rrokytskyy@...>
> > Subject: Re: Result Set not returning all rows
> >
> > > The test inserts four rows into a table. The third row contains a
> > > copyright symbol. When I select * only two rows are returned and
> > > no exceptions are thrown.
> > >
> > > In my larger program - I get gds synchronzation exceptions when I
> > > try to close the resultset and statements. I do not get these
> > > exceptions in the test case - but I am able to recreate the problem
> > > where not all rows are returned.
> >
> > Confirmed. This happens when you don't specify the lc_ctype and let
> > the driver select one. If you do specify the NONE, it works ok. I
> > will make more testing to find out what charset causes the problem.
> >
> > Also we have to check why request sync. exception happens and
> > not "cannot transliterate...".
> >
> > Best regards,
> > Roman Rokytskyy
> >
> >
> >
> > ________________________________________________________________________
> > ________________________________________________________________________
> >
> > Message: 12
> > Date: Sat, 13 Apr 2002 12:43:05 +0200
> > From: Marczisovszky Daniel <marczi@...>
> > Subject: Re: Re: problems on linux...
> >
> > r> Most likely this is a deadlock. I had similar problems in my code,
> > r> and the only thing that I needed was to set the transaction
> isolation
> > r> to TRANSACTION_READ_COMMITED. Current default transaction isolation
> > r> is TRANSACTION_REPEATABLE_READ.
> >
> > Sorry, same happens with READ_COMMITTED, it hangs again... :(
> >
> > daniel
> >
> >
> >
> > ________________________________________________________________________
> > ________________________________________________________________________
> >
> > Message: 13
> > Date: Sat, 13 Apr 2002 10:49:22 -0000
> > From: "rrokytskyy" <rrokytskyy@...>
> > Subject: Re: problems on linux...
> >
> > > Sorry, same happens with READ_COMMITTED, it hangs again... :(
> >
> > I will try the code. BTW, my deadlock happened on Windows too.
> >
> > Regards,
> > Roman
> >
> >
> >
> > ________________________________________________________________________
> > ________________________________________________________________________
> >
> > Message: 14
> > Date: Sat, 13 Apr 2002 12:56:00 +0200
> > From: Marczisovszky Daniel <marczi@...>
> > Subject: Re: Re: problems on linux...
> >
> > >> Sorry, same happens with READ_COMMITTED, it hangs again... :(
> >
> > r> I will try the code. BTW, my deadlock happened on Windows too.
> >
> > Well, I'm using Firebird 1.0. Should this deadlock occur? Does it have
> > any reason, or we can assume that this is an absolutely abnormal
> > behaviour?
> >
> > Now I go and try IB 6.5 evaluation version...
> >
> > daniel
> >
> >
> >
> > ________________________________________________________________________
> > ________________________________________________________________________
> >
> > Message: 15
> > Date: Sat, 13 Apr 2002 16:04:18 +0200
> > From: Marczisovszky Daniel <marczi@...>
> > Subject: New experiences with the no-update and deadlock bug!
> >
> > Hi,
> >
> > I'm sure this must be a Firebird bug and this is a serious one. I've
> > successfully installed Interbase 6.5 Trial version (the Borland guys
> > released it with a broken install script :( grrr... )
> >
> > With IB6.5 and the new type 4 JDBC driver it works seamless. Are you
> > agree that this is a really serious bug? If so, to whom should we send
> > this? I looked at the bug database, but I'm not sure that anybody is
> > reading that.
> >
> > best wishes,
> > daniel
> >
> >
> >
> > ________________________________________________________________________
> > ________________________________________________________________________
> >
> > Message: 16
> > Date: Sat, 13 Apr 2002 15:04:15 -0000
> > From: "rrokytskyy" <rrokytskyy@...>
> > Subject: Re: New experiences with the no-update and deadlock bug!
> >
> > > I'm sure this must be a Firebird bug and this is a serious one. I've
> > > successfully installed Interbase 6.5 Trial version (the Borland guys
> > > released it with a broken install script :( grrr... )
> > >
> > > With IB6.5 and the new type 4 JDBC driver it works seamless. Are you
> > > agree that this is a really serious bug? If so, to whom should we
> > > send this? I looked at the bug database, but I'm not sure that
> > > anybody is reading that.
> >
> > If you are sure this is a bug, report it to the bug database. They do
> > read the bug submissions. Alternatively, you can post to firebird-
> > devel list directly. Also, it would be great if you can create a test
> > case or put a detailed instructions what to do, since you have to
> > execute some operations in different environments.
> >
> > This might be a bug, might not. I agree that such things should never
> > happen, but if this is because the bug in the code or
> > misconfiguration I cannot tell.
> >
> > I will try to check this behaviour, and if it is present, I will make
> > a report in fb-devel list. However that might take some time.
> >
> > Best regards,
> > Roman Rokytskyy
> >
> >
> >
> > ________________________________________________________________________
> > ________________________________________________________________________
> >
> >
> >
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> >
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