Please, please - i need help urgent.

Question

hi,
i have a problem over 3 days and i cant find what is wrong.
i'm using jbuilder and with him evruthing is ok, but when i want to work with tomcat something going not good and i dont know what.
all the time i'm getting this exception:
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified
     org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:848)
     org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:781)
     org.apache.jsp.main_jsp._jspService(org.apache.jsp.main_jsp:300)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
java.sql.SQLException: [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified
     sun.jdbc.odbc.JdbcOdbc.createSQLException(Unknown Source)
     sun.jdbc.odbc.JdbcOdbc.standardError(Unknown Source)
     sun.jdbc.odbc.JdbcOdbc.SQLDriverConnect(Unknown Source)
     sun.jdbc.odbc.JdbcOdbcConnection.initialize(Unknown Source)
     sun.jdbc.odbc.JdbcOdbcDriver.connect(Unknown Source)
     java.sql.DriverManager.getConnection(Unknown Source)
     java.sql.DriverManager.getConnection(Unknown Source)
     cellcom_1.DBConnection.DBConnection.<init>(DBConnection.java:29)
     org.apache.jsp.main_jsp._jspService(org.apache.jsp.main_jsp:63)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.9 logs.
i checked my database configuration and its seems that it ok(and its run with jbuilder ok).
i need help, please!!!

Answer 1

Pray tell me where in teh server.xml/context.xml will you need to >configure a datasource for a simple bridge-driver program as is >obvious from teh stack trace? gcrashed,
When a datasource is used, the connections are retrieved from the datasource. The datasource maintains a pool of connections which can be configured. Programs can retrieve the connections from the datasource and after usage, they are returned to the datasource. Since it is the server that maintains the datasource, properties like connection info, max number of connections etc have to be configured in the server.xml or context.xml
And here is the relevant documentation in tomcat on how to set up a datasource - http://jakarta.apache.org/tomcat/tomcat-5.5-doc/jndi-datasource-examples-howto.html
Setting up a datasource in tomcat requires configuring them in server.xml (for global resources) or in context.xml (for a datasource resource local to your web application).
Here is a thread which describes in detail the process of setting it up - http://forum.java.sun.com/thread.jspa?threadID=643344
Now there are several issues setting up a tomcat datasource, especially for first time users. See the forum thread above for one such discussion.
What configuration is required in tomcat when the stack trace so >clearly shows that he is using the sun.jdbc.odbc.JdbcOdbcDriver and >so obviously using a dsn name for his connection??????As I said earlier, you are missing the point. The OP is not trying to create a connection directly from his program. Or by datasource, he does not mean the microsoft user-dsn datasource that I think you are reffering to. Once again, please read the tomcat link above on what a jndi-jdbc datasource means
Please give me the all 10 different issues that would produce the same stack trace.I was infact hoping somebody would ask. Just type the error stack trace in google, this forum or javaranch or theserverside.com and you would find tons of posts on setting up a jndi datasource and the issues people faced therein.
that's the first and easiest suggestion to give. you don't need to give that suggestion here. Its an open forum. Nobody can tell anybody else on what he/she ought to post. If you dont like it, ignore it. But wait, that's an easy answer. And Iam not going to take that stand. I stick to my opinion that asking the OP to read the docs is still the best suggestion in the post. The OP's problems combined with his comments that the db is working fine suggest a serious lack of understanding of the way datasource and connection pooling works with tomcat.
yes, if the problem is absolutely trivial like: how do i set up a connection using DriverManager - yes u can say - go read the docs. i can swear one can find the answers for half (or many more than that) problems posted in any forum in the documentation. but the fact is that many people do a fair amnount of hunting thru the docs and turn to a forum as a last resort. but they always miss something coz it's very natural. If you would search this forum and analyse duffy's or anybody else( who is a regular in this forum) previous posts, you would find that they have a pretty impeccable record of helping people with genuine problems when they know that the poster has taken some pains or effort to get it going by him/her self. They even hand hold people if the concept is a difficult one or if its one they find stiumlating/challenging.
But this 'unable to set up a datsource' thinggy has been asked and answered a thousand times in this forum and many more in several other forums and all the OP had to do was just search. To be fair, the OP may not have been aware of this fact as he is coming up against this the first time, which's why I maintain, read the docs or search the forum is a suggestion that ought to be taken seriously (rather than being thought of as rude or condescending).
If my comments seemed harsh, i apologize.Make that two. Its not my intention either to brow-beat or be harsh. I am just explaining why I took duffy's side, case in point. No offence intended.
cheers,
ram.