MySQL/JDeveloper JDBC - Losing Connection

I am working on a Java Web Application project using JDeveloper (9.0.5.1 Build 1605) while connecting to a mySQL database (4.0.18-max-nt). My application works fine up a certain number of connection. After that, I receive the following error message:
-<snip>-
java.sql.SQLException: Unable to connect to any hosts due to exception: java.lang.NullPointerException
at com.mysql.jdbc.Connection.createNewIO(Connection.java:1719)
at com.mysql.jdbc.Connection.<init>(Connection.java:432)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:400)
at java.sql.DriverManager.getConnection(DriverManager.java:512)
at java.sql.DriverManager.getConnection(DriverManager.java:193)
at model.NodeSummary.makeConnection(NodeSummary.java:229)
at model.NodeSummary.getIDs(NodeSummary.java:391)
-<snip>-
Based on some testing I've done, I can make up to a certain number of connections, than the next one fails. I've searched the web and it appears others have had this same problem. One person fixed the problem by switching to Tomcat.
Is there a solution to this? Do I also have to switch to Tomcat?
Thanks,
Mark

I'd check the bug reports for the mysql jdbc driver to see if this is a known issue, if not send them a bug report, it sounds like one.
Rob
Team JDev

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here i'm trying to connect to Users mysql database (i use Tomcat 4.1 and mysql servers and clients 4.0.1-alpha)
where is the problem ? when i run this servlet (http://localhost:8080/example/servlet/LoginServletJDBC ) it works ;
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i try other think : i changed the database with unexisting database and the result was that i was expected (Unknow database 'unexistingdatabase' )
what i miss ?
please... can anyone help me...
thank`s in advance

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(c) 2012 Microsoft Corporation. All rights reserved.
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