Configure j2ee to support oracle9 database using jndi

Question

how to configure j2ee1.3.1 to support access to oracle9 data base using jndi
i'm using a java bean to access an oracle9 data base,this snippet is written in the bean:
public connexionBD() Throws SQLException{
String dbName "java:com/env/jdbc/connexionBD";
DataSource ds=(DataSource)InitialContext().lookup(dbName);
Connection con =ds.getConnection("system","manager");
when i try to access the .jsp page that uses this javabeans the SQLException is thrown
I think it's a server configuration problem.
Knowing that the classpath and .jar files are configured, Can you help me resolve this problem
Thank you

Answer 1

These sections from the J2EE 1.4 platform sepc should hopefully help you understand java:comp/env.
J2EE.5.2.1.1 Access to Application Component s Environment An application component instance locates the environment naming context using the JNDI interfaces. An instance creates a javax.naming.InitialContext object by using the constructor with no arguments, and looks up the naming environment via the InitialContext under the name java:comp/env. The application component s environment entries are stored directly in the environment naming context, or in its direct or indirect subcontexts. Java Naming and Directory Interface" (JNDI) Naming Context 61 Environment entries have the Java programming language type declared by the Application Component Provider in the deployment descriptor. The following code example illustrates how an application component accesses its environment entries. public void setTaxInfo(int numberOfExemptions,...) throws InvalidNumberOfExemptionsException { ... // Obtain the application component s // environment naming context. Context initCtx = new InitialContext(); Context myEnv = (Context)initCtx.lookup( java:comp/env ); // Obtain the maximum number of tax exemptions // configured by the Deployer. Integer max = (Integer)myEnv.lookup( maxExemptions ); // Obtain the minimum number of tax exemptions // configured by the Deployer. Integer min = (Integer)myEnv.lookup( minExemptions ); // Use the environment entries to // customize business logic. if (numberOfExemptions > max.intValue() || numberOfExemptions < min.intValue()) throw new InvalidNumberOfExemptionsException(); // Get some more environment entries. These environment // entries are stored in subcontexts. String val1 = (String)myEnv.lookup( foo/name1 ); Boolean val2 = (Boolean)myEnv.lookup( foo/bar/name2 ); // The application component can also // lookup using full pathnames. Integer val3 = (Integer)initCtx.lookup( java:comp/env/name3 ); Integer val4 = (Integer)initCtx.lookup( java:comp/env/foo/name4 ); ... }
J2EE.5.2.4 J2EE Product Provider s Responsibilities The J2EE Product Provider has the following responsibilities: NAMING 64 " Provide a deployment tool that allows the Deployer to set and modify the values of the application component s environment entries. " Implement the java:comp/env environment naming context, and provide it to the application component instances at runtime. The naming context must include all the environment entries declared by the Application Component Provider, with their values supplied in the deployment descriptor or set by the Deployer. The environment naming context must allow the Deployer to create subcontexts if they are needed by an application component.