Cannot create JDBC driver of class ' for connect URL ' null ' problem resolution

Last Update:2015-07-01 Source: Internet

Author: User

Tags tomcat server

Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

Cannot create JDBC driver of class ' for connect URL ' null ' workaround 1 Technically, it's not a mistake, just a different version. tomcat-5.0.28 is this form<resource name= "Jdbc/conn" type= "Javax.sql.DataSource"/><resourceparams name= "Jdbc/conn" ><parameter><name>maxwait</name><value>5000</ Value></parameter><parameter><name>maxactive</name><value>10</value> </parameter><parameter><name>password</name><value>tiger</value></ Parameter><parameter><name>url</name><value>jdbc:oracle:thin: @localhost: oracle</ Value></parameter><parameter><name>driverclassname</name><value> Oracle.jdbc.driver.oracledriver</value></parameter><parameter><name>maxidle</name ><value>1</value></parameter><parameter><name>username</name><value >scott</value></parameter></ResourceParams> but apache-tomcat-6.0.32 is going to have this form < Resource name= "Jdbc/conn" auth= "Container" type= "Javax.sql.DataSource" maxactive= "Ten" maxidle= "1" maxwait= "5000" Username= "Scott" password= "Tiger" DRiverclassname= "Com.mysql.jdbc.Driver" url= "Jdbc:mysql://localhost:3306/neusys"/> cannot create JDBC driver of class ' for connect URL ' null ' problem solving method 2

1) Start the Tomcat server, open the browser, enter http://localhost:8080/ Admin (where localhost is the name server or host),
Enter the Admin Interface landing page, this time please enter the original installation required the user name and password, login to the management interface,

2) Select Resources-data Sources Enter the configuration data source interface, select
data source Actions, select Create NewData source, enter the configuration details interface
The main contents are as follows:
JNDI Name: ->jdbc/mysql
Data Source url ->jdbc:mysql://localhost:3306/test
JDBC Driver class-> org.gjt.mm.mysql.Driver
3) Modify the \conf\catalina\localhost directory to create an XML file named the name of the Web app you are publishing. XML, such as Testpool.xml, opens adding content as follows:
<?xml version= "1.0" encoding= "UTF-8"?
<context>
< Resource
     name= "Jdbc/mysql"
     type= " Javax.sql.DataSource "
     password=" 123456 "
      Driverclassname= "Org.gjt.mm.mysql.Driver"
     maxidle= "2"
      maxwait= "" "
     username=" root "
     url = "Jdbc:mysql://localhost:3306/test"
     maxactive= "4"/>

</context>
contents are <globalnamingresources> with Conf/server.xml;
<resource
      name= "Jdbc/mysql"
     type= "Javax.sql.DataSource"
    password= "123456"
     driverclassname= " Org.gjt.mm.mysql.Driver "
     maxidle=" 2 "
     maxwait = "" "
     username=" root "
     url=" jdbc:mysql:// Localhost:3306/test "
     maxactive=" 4 "/>
</globalnamingresources

Missing This step will error: Cannot create JDBC driver of class ' for connect URL ' null '
4) modify Web. XML

Open%tomcat_home%\conf\web.xml or Yourwebapp/web-inf/web.xml and add the following:
<resource-ref>
<description>DBConnection</description>
<res-ref-name>jdbc/mysql</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
Note that res-ref-name fills in the same name as the Jndi name mentioned earlier in this section.
Here, the configuration work is basically done!

5) Use "Java:comp/env/jdbc/mysql" when referencing Jndi;
To establish a file test test.jsp:
<% @page contenttype= "Text/html;charset=utf-8"%>
<% @page import= "java.sql.*"%>
<% @page import= "javax.sql.*"%>
<% @page import= "javax.naming.*"%>
<title>tomcat Connection Pool test </ Title>
<body>
<%
Context ctx=new initialcontext ();
Connection Conn=null;
datasourceds= (DataSource) ctx.lookup ("Java:comp/env/jdbc/mysql");
conn=ds.getconnection ();
Statementstmt=conn.createstatement (resultset.concur_read_only,resultset.concur_updatable);
ResultSet rs=stmt.executequery ("SELECT * fromtestexample");
while (Rs.next ()) {
out.println (Rs.getint (1));
Out.println (rs.getstring (2));
Out.println (rs.getstring (3));
}
OUT.PRINTLN ("Database operation succeeded! ");
Rs.close ();
Stmt.close ();
Conn.close ();

%>
</body>

Cannot create JDBC driver of class ' for connect URL ' null ' problem resolution

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

Sales Support

1 on 1 presale consultation

Chat Contact Sales
After-Sales Support

24/7 Technical Support 6 Free Tickets per Quarter Faster Response

Open a Ticket
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

Learn More