For test purposes, i have wrote the following code as a java program and it
worked fine, but when I tried it in a jsp page i got the following error:

Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://localhost:3306/exam";
Connection con = DriverManager.getConnection(url,"root", "exam");
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("Select type from questions");

while( rs.next() ) {
  System.out.println( rs.getString("type") );
}


org.apache.jasper.JasperException: Unable to compile class for JSP:



Stacktrace:
 org.apache.jasper.compiler.DefaultErrorHandler.javacError (DefaultErrorHandler.java:85)
 org.apache.jasper.compiler.ErrorDispatcher.javacError (ErrorDispatcher.java:330)
 org.apache.jasper.compiler.JDTCompiler.generateClass (JDTCompiler.java:415)
 org.apache.jasper.compiler.Compiler.compile (Compiler.java:308)
 org.apache.jasper.compiler.Compiler.compile (Compiler.java:286)
 org.apache.jasper.compiler.Compiler.compile (Compiler.java:273)
 org.apache.jasper.JspCompilationContext.compile (JspCompilationContext.java:566)
 org.apache.jasper.servlet.JspServletWrapper.service (JspServletWrapper.java:308)
 org.apache.jasper.servlet.JspServlet.serviceJspFile (JspServlet.java:320)
 org.apache.jasper.servlet.JspServlet.service (JspServlet.java:266)
 javax.servlet.http.HttpServlet.service (HttpServlet.java:803)



On 7/25/07, Mohammed Zabin <jotnarta@(protected):
>
> In cotrast, i have installed Oracle and worked very well, but MySql didn't
> work with me. I am using Connecter/J from MySql website, the beta version, I
> put the jar file in the CATALINA_HOME/lib, and i add it to the CLASSPATH.
> and I followed the instructions provided in Tomcat documentation, exactly,
> Didn't work :(
>
> On 7/24/07, David Smith <dns4@(protected):
> >
> > I've never dealt with Oracle but have done a lot of MySQL installs
> > without a single failure. Your config outside of the web.xml doesn't
> > look wrong in any way.
> >
> > You might want to put the <resource-ref> block in your web.xml as
> > described in the how-to's. It doesn't hurt and is part of the servlet
> > spec.
> >
> > --David
> >
> >
> > Mohammed Zabin wrote:
> >
> > > No, the same error, You know what David?? I put nothing in web.xml, I
> > am
> > > confused about this issue, when to use web.xml, and it might be the
> > > reason
> > > behind the unsuccessfull MySql Connection, I follow the same procedure
> > I
> > > followed to configure Oracle DBCP, I think it must work for MySql,
> > right?
> > >
> > > On 7/24/07, David Smith <dns4@(protected):
> > >
> > >>
> > >> Try this variant of your code:
> > >>
> > >> Context initContext = new InitialContext();
> > >> DataSource ds =
> > >> (DataSource)initContext.lookup("java:comp/env/jdbc/TestMySql");
> > >> Connection conn = ds.getConnection ();
> > >>
> > >> out.println("Connection Established");
> > >>
> > >> Essentially when you lookup java:comp/env/jdbc/TestMySql, that's the
> > >> full JNDI path to the DataSource and returns a DataSource type
> > object,
> > >> not a Context type object.
> > >>
> > >> --David
> > >>
> > >> Mohammed Zabin wrote:
> > >>
> > >> > Ok thank you, I did the following as you have stated:
> > >> >
> > >> > 1. in server.xml:
> > >> > <Resource name="jdbc/TestMySql" auth="Container"
> > >> > type="javax.sql.DataSource"
> > >> >             maxActive="100" maxIdle="30" maxWait="10000"
> > >> >             username="root" password="exam" driverClassName="
> > >> > com.mysql.jdbc.Driver"
> > >> >             url="jdbc:mysql://localhost:3306/exam"/>
> > >> > 2. in context.xml
> > >> > <ResourceLink global="jdbc/TestMySql" name="jdbc/TestMySql" type="
> > >> > javax.sql.DataSource"/>
> > >> >
> > >> > 3. in my test page:
> > >> > Context initContext = new InitialContext();
> > >> > Context envContext =
> > >> > (Context)initContext.lookup("java:comp/env/jdbc/TestMySql");
> > >> > DataSource ds = (DataSource)envContext.lookup("jdbc/TestMySql");
> > >> > Connection conn = ds.getConnection();
> > >> >
> > >> > out.println("Connection Established");
> > >> > And i put nothing in web.xml, I have the following error:
> > >> >
> > >> > org.apache.jasper.JasperException: Unable to compile class for JSP:
> > >> >
> > >> >
> > >> >
> > >> > Stacktrace:
> > >> >   org.apache.jasper.compiler.DefaultErrorHandler.javacError (
> > >> DefaultErrorHandler.java:85)
> > >> >
> > >> >   org.apache.jasper.compiler.ErrorDispatcher.javacError(
> > >> ErrorDispatcher.java:330)
> > >> >
> > >> >   org.apache.jasper.compiler.JDTCompiler.generateClass (
> > >> JDTCompiler.java:415)
> > >> >
> > >> >   org.apache.jasper.compiler.Compiler.compile (Compiler.java:308)
> > >> >   org.apache.jasper.compiler.Compiler.compile (Compiler.java:286)
> > >> >   org.apache.jasper.compiler.Compiler.compile (Compiler.java:273)
> > >> >   org.apache.jasper.JspCompilationContext.compile(
> > >> JspCompilationContext.java:566)
> > >> >
> > >> >   org.apache.jasper.servlet.JspServletWrapper.service(
> > >> JspServletWrapper.java:308)
> > >> >
> > >> >
> > >> org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java
> > >> :320)
> > >> >
> > >> >   org.apache.jasper.servlet.JspServlet.service(JspServlet.java
> > :266)
> > >> >   javax.servlet.http.HttpServlet.service (HttpServlet.java:803)
> > >> >
> > >> >
> > >> >
> > >> > On 7/23/07, David Smith <dns4@(protected):
> > >> >
> > >> >>
> > >> >> A few things to consider:
> > >> >>
> > >> >> 1. Either place your Resource definition in server.xml as a
> > >> >> GlobalResource *OR* in your webapp's context.xml file.
> > >> >>
> > >> >> 2. If you have the Resource defined in the GlobalResources, that's
> >
> > >> the
> > >> >> only time you need to use a ResourceLink element in context.xml.
> > >> >>
> > >> >> 3. Drop the autoReconnect parameter in your mysql URL. It has
> > it's
> > >> >> uses, but not in a pooled environment.
> > >> >>
> > >> >> 4. You should probably be attempting to use the path
> > >> >> java:comp/env/jdbc/TestMySQL (note the lack of a '/' before comp)
> > as
> > >> >> described in the JNDI howto on tomcat's website. I think I saw
> > you
> > >> >> using java:/comp/env/jdbc/TestMySQL in one of your posts.
> > >> >>
> > >> >> 5. Please post relevant messages from your logs if this isn't
> > >> working.
> > >> >>
> > >> >> --David
> > >> >>
> > >> >> Mohammed Zabin wrote:
> > >> >>
> > >> >> > Would you please be more specific? which file you mean? I have
> > >> created
> > >> >> > Oracel connection Pool as the stated way above, and it's worked
> > >> fine,
> > >> >> > shall
> > >> >> > i put resource defeninitoin in context.xml only?
> > >> >> >
> > >> >> > On 7/22/07, Pid <p@(protected):
> > >> >> >
> > >> >> >>
> > >> >> >> You only need one resource definition.
> > >> >> >> You only need a resource link definition if your resource is a
> > >> global
> > >> >> >> one.
> > >> >> >>
> > >> >> >> Simplify your configuration and then post the error message
> > >> from the
> > >> >> >> logs so we can see Tomcat says is wrong.
> > >> >> >>
> > >> >> >> p
> > >> >> >>
> > >> >> >>
> > >> >> >> Mohammed Zabin wrote:
> > >> >> >> > Hi All
> > >> >> >> >
> > >> >> >> > I have confiured oracle connection pool on my tomacat 6, and
> > it
> > >> >> worked
> > >> >> >> > fine.
> > >> >> >> > When i came to configure MySql, I repeated the same steps for
> > >> >> Oracle
> > >> >> >> > databse, with considering the specfication of MySql database.
> >
> > >> But
> > >> >> it's
> > >> >> >> > didn't work. Any Help please about configuring MySql,
> > >> >> >> > I downloaded MySql connector from mysql website and place it
> > in
> > >> >> >> > CATALINA_HOME/lib directory, and i put the following:
> > >> >> >> >
> > >> >> >> > 1. in server.xml file:
> > >> >> >> > <Resource name="jdbc/TestMySql" auth="Container"
> > >> >> >> > type="javax.sql.DataSource"
> > >> >> >> >             maxActive="100" maxIdle="30"
> > maxWait="10000"
> > >> >> >> >             username="*" password="*" driverClassName="
> >
> > >> >> >> > com.mysql.jdbc.Driver"
> > >> >> >> >
> > >> >> >> > url="jdbc:mysql://localhost:3306/exam?autoReconnect=true"/>
> > >> >> >> >
> > >> >> >> > 2. in web.xml file
> > >> >> >> > <resource-ref>
> > >> >> >> >    <description>Oracle Datasource example</description>
> > >> >> >> >    <res-ref-name>jdbc/TestMySql</res-ref-name>
> > >> >> >> >    <res-type>javax.sql.DataSource</res-type>
> > >> >> >> >    <res-auth>Container</res-auth>
> > >> >> >> > </resource-ref>
> > >> >> >> >
> > >> >> >> > 3. in context.xml file (on server's context.xml file):
> > >> >> >> > <Resource name="jdbc/TestMySql" auth="Container"
> > >> >> >> > type="javax.sql.DataSource"
> > >> >> >> >             maxActive="100" maxIdle="30"
> > maxWait="10000"
> > >> >> >> >             username="*" password="*"
> > driverClassName="
> > >> >> >> > com.mysql.jdbc.Driver"
> > >> >> >> >             url="jdbc:mysql://localhost:3306/exam"/>
> > >> >> >> >
> > >> >> >> > 4. in cotext.xml file ( In my web application's context.xml
> > >> file):
> > >> >> >> > <ResourceLink global="jdbc/TestMySql" name="jdbc/TestMySql"
> > >> type="
> > >> >> >> > javax.sql.DataSource"/>
> > >> >> >> >
> > >> >> >> > Any Help please?
> > >> >> >> >
> > >> >> >>
> > >> >> >>
> > >> >> >>
> > >> >> >
> > >> >>
> > >> >>
> > >> >>
> > ---------------------------------------------------------------------
> > >> >> To start a new topic, e-mail: users@(protected)
> > >> >> To unsubscribe, e-mail: users-unsubscribe@(protected)
> > >> >> For additional commands, e-mail: users-help@(protected)
> > >> >>
> > >> >>
> > >> >
> > >>
> > >>
> > >> ---------------------------------------------------------------------
> >
> > >> To start a new topic, e-mail: users@(protected)
> > >> To unsubscribe, e-mail: users-unsubscribe@(protected)
> > >> For additional commands, e-mail: users-help@(protected)
> > >>
> > >>
> > >
> >
> >
> > ---------------------------------------------------------------------
> > To start a new topic, e-mail: users@(protected)
> > To unsubscribe, e-mail: users-unsubscribe@(protected)
> > For additional commands, e-mail: users-help@(protected)
> >
> >
>