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JNDI problem when run at java server-side

chinsw asked
Last Modified: 2013-11-24
In my project,I'm using Tomcat 5.0 to configure the JNDI connection.When I run at webpage,it works fine.But,when I run at java server-side (through Main() object), I can;t connect to DB,it will hit error when come to this logic :

Context envContext = (Context) initContext.lookup("java:/comp/env");

And it returns error like this :

javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file:  java.naming.factory.initial
        at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:645)
        at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:288)
        at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:325)
        at javax.naming.InitialContext.lookup(InitialContext.java:392)
        at my.com.eprotea.common.db.DBConnManager.<init>(DBConnManager.java:45)
        at my.com.eprotea.common.db.DBConnManager.main(DBConnManager.java:65)

Anyone can help me to solve this problem?I need to run in backend process.thx anyway.
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