Web Service exception: Closed Connection

Question

I build a J2EE 1.3 Web Service using JDeveloper 10.1.3 by generating it from a PL/SQL procedure. It works fine on the embedded server and even on the standalone OC4J. When I deploy it on an OAS 10.1.3 it works fine initially but the day after I start to receive the following SOAP message:
<?xml version="1.0" encoding="UTF-8" ?>
- <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
- <SOAP-ENV:Body>
- <SOAP-ENV:Fault>
<faultcode>SOAP-ENV:Server.Exception:</faultcode>
<faultstring>java.sql.SQLException: java.sql.SQLException: Closed Connection</faultstring>
<faultactor>/login/LoginTesthire</faultactor>
</SOAP-ENV:Fault>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>

Answer 1

When I program a non-web application I use the following code to connect to and query a SQL Server database (I have omitted the try -catch sections):
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
String url = "jdbc:sqlserver://localhost:2766;databaseName=Cosmotim;IntegratedSecurity=true";
Connection conn = DriverManager.getConnection(url);
Statement s1=conn.createStatement();
String select="SELECT * FROM [Table name]";
ResultSet DBSet=s1.executeQuery(select1);But when I use the same code in a Web Service method with return type String and I try to deploy the Web service (to Java System Application Server PE 9 with NetBeans) I get many error messages and I can't deploy the service.
I cannot understand why I can't deploy this WS but I can deploy other Web Services which do not use database connectivity.