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Oracle and java.sql.SQLException: No suitable driver

Strange problem, just one part of simple code, works on my XP system, but not on Windows2003.

  1. Connection connection=null;
  2. try{
  3. connection = DriverManager.getConnection ("jdbc:odbc:thin@", "username", "password");
  4. PreparedStatement pstmt = con.prepareStatement ("Select * from sometable");
  5. ResultSet rset = pstmt.executeQuery();
  6. ....................

Very simple SQL code for one servlet, but when i run it in Tomcat, i got this exception:

  1. java.sql.SQLException: No suitable driver found for
  2. jdbc:oracle:thin:@ at java.sql.DriverManager.getConnection(Unknown Source)at java.sql.DriverManager.getConnection(Unknown Source) at
  3. org.xmlBlaster.util.queue.jdbc.JdbcConnectionPool.addConnectionToPool(
  4. at
  5. ............

In my XP system, i copied classes12.jar under my project's lib folder in
and the servlet works fine.

But under other Window2003 system, same Tomcat version, same Java version, I also copied the classes12.jar in the same lib folder. But the servlet has always this exception. Strange, no idea. I have tried to copied classes12.jar under ${java_home}/lib/ext, did not work.

And later i found official solution from Oracle website for this:

"then you probably have not added the Oracle JDBC driver ZIP file to your CLASSPATH environment variable. Either use:

[Oracle Home]/jdbc/lib/ JDK 1.1)
[Oracle Home]/jdbc/lib/ JDK 1.2)

Furthermore, you need to ensure that your JDBC driver is registered with the java.sql.DriverManger.
If you are using the server-side (kprb) JDBC driver, or if you used one of the methods connect() or getConnection() on oracle.sqlj.runtime.Oracle to obtain a SQLJ connection context, then this will happen automatically.
Otherwise you need to register the Oracle JDBC driver, for example as follows:

java.sql.DriverManager.registerDriver (new oracle.jdbc.driver.OracleDriver());

Under windows2003 i can not add to the environment variable, i only used the code in servlet, this really sovled this problem, but i dont understand why under my XP system, servlet can still work without this registerDriver code. I have also not set the into CLASSPATH environment under XP. Where is the difference.......




"But under other Window2003 system, same Tomcat version, same Java version, I also copied the classes12.jar in the same lib folder. But the servlet has always this exception. Strange, no idea. I have tried to copied classes12.jar under ${java_home}/lib/ext, did not work. "
Thanks for the information

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Thanks for this , works great if you use the default XP Start menu. I could'nt get it to work with the Classic Start menu
though. Any chance of a fix ?

I am using JDBC connection pooling to read a large data set and after about an hour or so into the result set processing I get the exception stated blow on all the connections in the pool and the process dies.. What is causing this?


Thanks for the help. I got rid of this issue by adding classes12.jar in my classpath env. variable and project folder. I also have to add the java.sql.DriverManager.registerDriver (new oracle.jdbc.driver.OracleDriver()); line in my code.

Thanks once again.


That's a strange problem indeed {:jawdrop:} . I'd never figured out that solution, thanks for the article for future references I'll check your blog.

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I am using following code to Connect with my oracle database...

static final String connect_string = "jdbc:rdbThin://";
static final String userName = "uername";
static final String password = "password";
public void openConnection() throws SQLException {
Connection con = null;

DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
con = DriverManager.getConnection (connect_string, userName, password);

This results in following error while running it...

java.sql.SQLException: No suitable driver
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)

I copied "classes12_g.jar" file under lib directory in WEB-INF directory.

So please kindly help me for the same... {:(}

I have got the same problem that Window2003 system, same Tomcat version, the same version of Java, I also copied classes12.jar in the same lib. But still this servile can solve it?
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