Loading JDBC-Driver from a JSP
Hi,
i want to load a JDBC-Driver fromout my JSP-File, so i used:
Class.forName("org.postgresql.Driver");
but when i start it i get a ClassNotFoundException...
my jsp-file and the org-directory are stored in
<tomcat-dir>\webapps\examples\
so both in the same directory...
any ideas why i cannot load it?
thx anyway
cu Errraddicator
it still does not work...
now i can load the driver, but when i call the DriverManager to establish a connection i get a sqlexception with the message "no suitable driver"...
but why? i�ve loaded the driver and normally it registeres itself at the driver-manager, but it doesn�t...
any ideas?
thx anyway
cu Errraddicator
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<br>
<br>
Scriptlet :
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I am not sure why it is not able to get the Driver since the required jar is there in lib folder? Am I missing something ?
Edited by: sb-onward on Jul 30, 2009 6:01 PMHi,
Make sure you have set the Classpath in CRConfig.xml for the jdbc jar.
Place the CrConfig.xml in the classes directory of your application.
Please let me know the results.
Regards,
Neeraj -
Cannot load JDBC Driver Class in Tomcat5.5 using struts.
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Cardwell -
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In MyApp/WEB-INF/web.xml:
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</resource-ref>
The Oracle jdbc jar file classes12.jar is under common/lib in Tomcat's home. read Permission is there.
In the servlet:
init(ServletConfig config):
Context init = new InitialContext();
Context ctx = (Context) init.lookup("java:comp/env");
dataSource = (DataSource) ctx.lookup("jdbc/acdb");
doPost(..)
the error occured at :
synchronized (dataSource){
con = dataSource.getConnection();}
Thanks in advance!Everything looks correct to me, except for one thing.
In your web.xml you have this:
<res-ref-name>jdbc/ora</res-ref-name> In your server.xml, you have this tag, which matches your web.xml:
<ResourceParams name="jdbc/ora" > But in your Java code, you've got this:
dataSource = (DataSource) ctx.lookup("jdbc/acdb"); When I've successfully set up a Web app data source, all three names had to agree. You either need to change your Java lookup name to "jdbc/ora" or change the web.xml and server.xml to "jdbc/acdb".
See if that does it. Everything else sounds correct to me. - MOD -
hi all :)
i'm using a datasource (tomcat 4.1.18 with jdk 1.4)
i'm the following error :
java.sql.SQLException: Cannot load JDBC driver class 'null'my classes12.jar find in $CATALINA_HOME/common/lib
where is ma error ?
thanks a lot.GlobalNamingResources?
I sent up a data source for each app, like this:
<Context path="/api-prototype"
docBase="api-prototype.war"
debug="1"
reloadable="true"
crossContext="true"
useNaming="true">
<Logger className="org.apache.catalina.logger.FileLogger"
prefix="localhost-api-prototype-log."
suffix=".txt"
timestamp="true"/>
<Resource name="jdbc/APIPrototype"
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type="javax.sql.DataSource"/>
<!-- Oracle 9.2.0.1 data source -->
<ResourceParams name="jdbc/APIPrototype">
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<name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
</parameter>
<parameter>
<name>driverClassName</name>
<value>oracle.jdbc.driver.OracleDriver</value>
</parameter>
<parameter>
<name>url</name>
<value>jdbc:oracle:thin:@elvis:1521:CAPP</value>
</parameter>
<parameter>
<name>username</name>
<value>api</value>
</parameter>
<parameter>
<name>password</name>
<value>mod</value>
</parameter>
<parameter>
<name>maxActive</name>
<value>20</value>
</parameter>
<parameter>
<name>maxIdle</name>
<value>0</value>
</parameter>
<parameter>
<name>maxWait</name>
<value>60000</value>
</parameter>
<parameter>
<name>removeAbandoned</name>
<value>true</value>
</parameter>
<parameter>
<name>removeAbandonedTimeout</name>
<value>300</value>
</parameter>
</ResourceParams>
</Context>This works fine on Tomcat 4.1.24. I don't know where you got that example from, but I'd recommend that you look at the Tomcat JNDI How-to:
http://jakarta.apache.org/tomcat/tomcat-4.1-doc/jndi-datasource-examples-howto.html
Why go anywhere else? - MOD -
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WEBLOGIC_CLASSPATH.
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This is the first few lines from the exception stacktrace.
java.util.zip.ZipException: invalid LOC header (bad signature)
at java.util.zip.ZipFile.read(Native Method)
at java.util.zip.ZipFile.access$5(ZipFile.java(Compiled Code))
at
java.util.zip.ZipFile$ZipFileInputStream.read(ZipFile.java(Compiled Code))
at java.util.zip.ZipFile$1.fill(ZipFile.java(Compiled Code))
at
java.util.zip.InflaterInputStream.read(InflaterInputStream.java(Compiled
Code))
at weblogic.boot.ZipSource.getBytes(ZipSource.java(Compiled Code))
at
weblogic.boot.ServerClassLoader.findLocalClass(ServerClassLoader.java(Compil
ed Code))
at java.lang.ClassLoader.loadClass(ClassLoader.java(Compiled Code))
at java.lang.Class.forName1(Native Method)
at java.lang.Class.forName(Class.java(Compiled Code))
at common.cimsdao.DaoConnection.getConnection(DaoConnection.java:66)Hi.
You might try getting another copy of the driver. It could be corrupted in some
way but still work with the jar utility.
Regards,
Michael
Pavan Dinavahi wrote:
Getting java.util.zip.ZipException trying to Load JDBC Driver Class.
The JDBC driver classes are in a jar file which is in WEBLOGIC_CLASSPATH.The
jar file is perfectly valid, atleast I can see it with "jar".
It works fine If I extract the jar file into my serverclasses which is in
WEBLOGIC_CLASSPATH.
We are running WLS51SP10 on AIX4.3.3. Classic VM (J2RE 1.2.2 IBM build
ca122-20010313 (JIT enabled: jitc))
I appreciate any help on this.
Thanks,
Pavan
This is the first few lines from the exception stacktrace.
java.util.zip.ZipException: invalid LOC header (bad signature)
at java.util.zip.ZipFile.read(Native Method)
at java.util.zip.ZipFile.access$5(ZipFile.java(Compiled Code))
at
java.util.zip.ZipFile$ZipFileInputStream.read(ZipFile.java(Compiled Code))
at java.util.zip.ZipFile$1.fill(ZipFile.java(Compiled Code))
at
java.util.zip.InflaterInputStream.read(InflaterInputStream.java(Compiled
Code))
at weblogic.boot.ZipSource.getBytes(ZipSource.java(Compiled Code))
at
weblogic.boot.ServerClassLoader.findLocalClass(ServerClassLoader.java(Compil
ed Code))
at java.lang.ClassLoader.loadClass(ClassLoader.java(Compiled Code))
at java.lang.Class.forName1(Native Method)
at java.lang.Class.forName(Class.java(Compiled Code))
at common.cimsdao.DaoConnection.getConnection(DaoConnection.java:66)--
Michael Young
Developer Relations Engineer
BEA Support -
Hi,
i am doing a forum application.
i am trying to connect database connection through javax.sql.DataSource.
I am using Eclipse editor for developing this application and i am using sql server 2000 database.
i have create a servlet file.
here is the coding.
DatabaseGetConnection.java
`````````````````````````````````````````
import java.io.IOException;
import java.sql.Connection;
import java.sql.SQLException;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;
public class DatabaseGetConnection extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
private Connection con=null;
private DataSource ds=null;
public DatabaseGetConnection() throws ServletException {
super();
public DatabaseGetConnection(final HttpServletRequest req, final HttpServletResponse res) throws ServletException, IOException {
this.doPost(req, res);
public void init() throws ServletException {
try
final Context initContext = new InitialContext();
final Context envContext = (Context)initContext.lookup("java:/comp/env");
this.ds = (DataSource)initContext.lookup("jdbc/mySQLServer");
}catch(final NamingException ne)
ne.printStackTrace();
}catch(final Exception e)
e.printStackTrace();
public DataSource getDS()
System.out.println("Datasource method calling");
if (this.ds!=null)
System.out.println("Datasource not null");
}else
System.out.println("Datasource null");
return this.ds;
public Connection getCon()
try
this.con=this.getDS().getConnection();
if (this.con!=null)
System.out.println("Connection Successfull");
}catch(final SQLException se)
System.out.print("Connection Establishment Error : ");
se.printStackTrace();
return this.con;
I have configured server.xml. here is the configuration
server.xml
````````````````
<GlobalNamingResources>
<Resource name="jdbc/mySQLServer" global="jdbc/mySQLServer" auth="Container"
type="javax.sql.DataSource" factory="org.apache.tomcat.dbcp.dbcp.BasicDataSourceFactory" driverClassName="com.microsoft.jdbc.sqlserver.SQLServerDriver"
url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=forum;SelectMethod=cursor"
username="sa" password="sa" maxActive="20" maxIdle="10"
maxWait="-1"/>
</GlobalNamingResources>
here is the web.xml file
``````````````````````````````````
<resource-ref>
<res-ref-name>jdbc/mySQLServer</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
is this configuration correct? plz help me about the configuration and coding through Eclipse.
i have run the application and i got the error. here is the error details
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.microsoft.jdbc.sqlserver.SQLServerDriver'
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:766)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540)
at com.forum.database.DatabaseGetConnection.getCon(DatabaseGetConnection.java:85)
at com.forum.database.DatabaseGetConnection.GetAllTopicSearch(DatabaseGetConnection.java:101)
at org.apache.jsp.test_jsp._jspService(test_jsp.java:73)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:328)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.microsoft.jdbc.sqlserver.SQLServerDriver
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:760)
... 24 more
thanks and regards,
k.s.kumarPlease don't multipost, it's rude: http://forum.java.sun.com/thread.jspa?threadID=5219591
Please continue on that thread. -
Cannot load JDBC driver class 'com.mysql.jdbc.Driver'
Hi,
At the moment I'm trying to get an example working. The error message I get is:
Unable to get connection, DataSource invalid: "org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.mysql.jdbc.Driver'"
The example I tried is http://tomcat.apache.org/tomcat-6.0-doc/jndi-datasource-examples-howto.html.
Configuration:
Wampserver 2.0 (Apache, MySQL, PHP for Windows XP), Tomcat 6.0 and jdk1.6.0_03.
The following files are installed in %CATALINA_HOME%/webabbs/
- Dbtest/test.jsp
- Dbtest/WEB-INF/web.xml
- Dbtest/WEB-INF/lib/standard.jar
- Dbtest/WEB-INF/lib/tomcat-dbcp.jar
- Dbtest/WEB-INF/lib/jstl.jar
Tia,
Abel.Hi,
I added the jar file containing the requested class to my lib directory. So the current contents of that directory is:
The following files are installed in %CATALINA_HOME%/webabbs/
- Dbtest/test.jsp
- Dbtest/WEB-INF/web.xml
- Dbtest/WEB-INF/lib/standard.jar
- Dbtest/WEB-INF/lib/tomcat-dbcp.jar
- Dbtest/WEB-INF/lib/jstl.jar
- Dbtest/WEB-INF/lib/mysql-connector-java-5.1.5-bin.jar
More importantly, I started my Wamp server.
The example works as it should have. Thanks for the feedback.
Abel -
I am trying to run a program and keep getting the error Failed to load JDBC driver. java.lang.ClassNotFoundException
How can I correct this?I was just trying to execute this example from Deitel's Java book.
import java.awt.*;
import java.sql.*;
import java.util.*;
import javax.swing.*;
public class DisplayAuthors extends JFrame {
// JDBC driver name and database URL
static final String JDBC_DRIVER = "com.ibm.db2j.jdbc.DB2jDriver";
static final String DATABASE_URL = "jdbc:db2j:books";
// declare Connection and Statement for accessing
// and querying database
private Connection connection;
private Statement statement;
// constructor connects to database, queries database, processes
// results and displays results in window
public DisplayAuthors()
super( "Authors Table of Books Database" );
// connect to database books and query database
try {
// specify location of database on filesystem
System.setProperty( "db2j.system.home", "C:/Cloudscape_5.0" );
// load database driver class
Class.forName( JDBC_DRIVER );
// establish connection to database
connection = DriverManager.getConnection( DATABASE_URL );
// create Statement for querying database
statement = connection.createStatement();
// query database
ResultSet resultSet =
statement.executeQuery( "SELECT * FROM authors" );
// process query results
StringBuffer results = new StringBuffer();
ResultSetMetaData metaData = resultSet.getMetaData();
int numberOfColumns = metaData.getColumnCount();
for ( int i = 1; i <= numberOfColumns; i++ )
results.append( metaData.getColumnName( i ) + "\t" );
results.append( "\n" );
while ( resultSet.next() ) {
for ( int i = 1; i <= numberOfColumns; i++ )
results.append( resultSet.getObject( i ) + "\t" );
results.append( "\n" );
// set up GUI and display window
JTextArea textArea = new JTextArea( results.toString() );
Container container = getContentPane();
container.add( new JScrollPane( textArea ) );
setSize( 300, 100 ); // set window size
setVisible( true ); // display window
} // end try
// detect problems interacting with the database
catch ( SQLException sqlException ) {
JOptionPane.showMessageDialog( null, sqlException.getMessage(),
"Database Error", JOptionPane.ERROR_MESSAGE );
System.exit( 1 );
// detect problems loading database driver
catch ( ClassNotFoundException classNotFound ) {
JOptionPane.showMessageDialog( null, classNotFound.getMessage(),
"Driver Not Found", JOptionPane.ERROR_MESSAGE );
System.exit( 1 );
// ensure statement and connection are closed properly
finally {
try {
statement.close();
connection.close();
// handle exceptions closing statement and connection
catch ( SQLException sqlException ) {
JOptionPane.showMessageDialog( null,
sqlException.getMessage(), "Database Error",
JOptionPane.ERROR_MESSAGE );
System.exit( 1 );
} // end DisplayAuthors constructor
// launch the application
public static void main( String args[] )
DisplayAuthors window = new DisplayAuthors();
window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
} // end class DisplayAuthors -
Problem loading jdbc driver in Tomcat
Hi,
I have got a connection to MySQL5.0 from TomCat 5.5.13, that was test correctly in development (JSC Upd 1) but I encounter the following deployment error :
com.sun.rave.web.ui.appbase.ApplicationException: org.apache.jasper.JasperException: org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.mysql.jdbc.Driver'
When I verify, I found that if I put the mysql Connector JDBC driver in <tomcat>/common/lib, there is no error.
But when the MySql Connector JDBC driver resides in <tomcat>/shared/lib, the error persists.
What's the difference ? shouldn't it work for both ?
Thanks in advance for any pointers and advise.hmm... i guess that it's a must to include the lib at /common/lib instead of shared/lib .
Is there a Tomcat resource that I can read up on ?
rgds -
Urgent... unable to load JDBC driver
i have developed a servlet which will establish connection to mySQL.. but it couldn't load the JDBC driver even i placed
[ mysql-connector-java-2.0.14-bin.zip ] in [ C:\j2sdk1.4.2_05\jre\lib\ext\ ]
in fact.. it work fine b4 i format my notebook.. anyone can help me??
pls note that i using APACHE TOMCAT and mySQL 3.23
pls help.. very urgent one
the following is my servlet code.....
import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class LoginServlet extends HttpServlet {
static final String dbURL = "jdbc:mysql://localhost" ;
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
Connection conn = null;
String nextJSP = null;
try {
Class.forName("org.gjt.mm.mysql.Driver");
catch (ClassNotFoundException e) {
throw new ServletException("Unable to load JDBC driver");
}i already add new variable in environment variables
variable name = CLASSPATH
variable value = C:\j2sdk1.4.2_05\jre\lib\ext\mysql-connector-java-2.0.14-bin.jar;
but the same output is come up.. still unable to load my JDBC driver in TOMCAT... y?
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