Hi Tomcat Team,
On Tue, Jul 21, 2015 at 4:21 PM, Konstantin Kolinko <knst.koli...@gmail.com>
wrote:
> 2015-07-21 8:35 GMT+03:00 Niranjan Karunanandham <niranjan.k...@gmail.com
> >:
> > [sending to users list]
> >
> > On Thu, Jul 16, 2015 at 10:23 AM, Niranjan Karunanandham <
> > niranjan.k...@gmail.com> wrote:
> >
> >> Hi,
> >>
> >> On debugging Tomcat (7.0.59), I noticed that the SelectorContext is
> >> initialized twice when a lookup is performed for JNDI defined in web
> >> application (META-INF/context.xml).
> >> When the lookup is performed, the Servlet first calls the init method of
> >> InitailContext and this "returns new SelectorContext(env, true)". Then
> it
> >> calls the lookup method of InitialContext which again initializes the
> >> SelectorContext but now it "returns new SelectorContext(env)" [where the
> >> SelectorContextor.initialContext is set to *false*] and then the lookup
> >> is performed.
>
> 1. javax.naming.InitialContext class is not ours. It is part of JDK.
>
> 2. SelectorContext object is immutable. The first one has
> "initialContext == true", the second one has "false". Those are two
> different objects.
>
Why are there two different SelectorContext object being created. I noticed
that when we do a JNDI lookup from webapp, it requires the Context.xml to
be only read-only (please correct me if am wrong) for which the
initialContext is false for the SelectorContext. So when is the first
SelectorContext (where the initialContext is set to true) use?
> 3. It is usually better to lookup the DataSource once (at startup time
> /first access time) and cache the reference locally.
>
> >> Why is tomcat initializing the SelectorContext twice here?
> >>
> >> My Java Webapp Code which does the lookup:
> >> *initCtx = new InitialContext();*
> >> *Context envContext = (Context) initCtx.lookup("java:comp/env");*
> >> *DataSource dataSource = (DataSource) envContext.lookup("*jdbc/contextDB
> >> *");*
> >>
> >> Resource defined in META-INF/context.xml in webapp:
> >>
> >> <Resource name="jdbc/contextDB" auth="Container" type
> >> ="javax.sql.DataSource"
> >> maxActive="100" maxIdle="30" maxWait="10000"
> >> username="user" password="user123"
> driverClassName="com.mysql.jdbc.Driver"
> >>
> >> url="jdbc:mysql://localhost:3306/WebAppTestDB"/>
> >>
>
Regards,
Nira
On Tue, Jul 21, 2015 at 4:21 PM, Konstantin Kolinko <knst.koli...@gmail.com>
wrote:
> 2015-07-21 8:35 GMT+03:00 Niranjan Karunanandham <niranjan.k...@gmail.com
> >:
> > [sending to users list]
> >
> > On Thu, Jul 16, 2015 at 10:23 AM, Niranjan Karunanandham <
> > niranjan.k...@gmail.com> wrote:
> >
> >> Hi,
> >>
> >> On debugging Tomcat (7.0.59), I noticed that the SelectorContext is
> >> initialized twice when a lookup is performed for JNDI defined in web
> >> application (META-INF/context.xml).
> >> When the lookup is performed, the Servlet first calls the init method of
> >> InitailContext and this "returns new SelectorContext(env, true)". Then
> it
> >> calls the lookup method of InitialContext which again initializes the
> >> SelectorContext but now it "returns new SelectorContext(env)" [where the
> >> SelectorContextor.initialContext is set to *false*] and then the lookup
> >> is performed.
>
> 1. javax.naming.InitialContext class is not ours. It is part of JDK.
>
> 2. SelectorContext object is immutable. The first one has
> "initialContext == true", the second one has "false". Those are two
> different objects.
>
> 3. It is usually better to lookup the DataSource once (at startup time
> /first access time) and cache the reference locally.
>
> >> Why is tomcat initializing the SelectorContext twice here?
> >>
> >> My Java Webapp Code which does the lookup:
> >> *initCtx = new InitialContext();*
> >> *Context envContext = (Context) initCtx.lookup("java:comp/env");*
> >> *DataSource dataSource = (DataSource) envContext.lookup("*jdbc/contextDB
> >> *");*
> >>
> >> Resource defined in META-INF/context.xml in webapp:
> >>
> >> <Resource name="jdbc/contextDB" auth="Container" type
> >> ="javax.sql.DataSource"
> >> maxActive="100" maxIdle="30" maxWait="10000"
> >> username="user" password="user123"
> driverClassName="com.mysql.jdbc.Driver"
> >>
> >> url="jdbc:mysql://localhost:3306/WebAppTestDB"/>
> >>
> >
> > --
> > *Niranjan Karunanandham*
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
> For additional commands, e-mail: users-h...@tomcat.apache.org
>
>
--
*Niranjan Karunanandham*
