Can't load JDBC Driver

Hi,
I can't load my JDBC driver for SQLserver database to
opening my DB with a servlet ...
platform : Windows 2000 server
servlet container : Jakarta-tomcat 3.2.2
jdk : jdk1.3
After executing the servlet which load the JDBC driver, the following message was appearing:
"ClassNotFoundException, java.lang.NullPointerException"
Thanks for your help.

Looks like the servlet is not able to find the required class in the package...Tomcat rewrites the classpath....So you might want to look at /bin/tomcatEnv.bat and modify it accordingly....Of course, check your classpath env variable to see if all the necessary zip/jar files are included.

Similar Messages

Can't load jdbc driver in servlet

Dear All,
I have tried to connect to MS SQL SERVER 2000 through JDBC DRIVER FOR
SQLSERVER. However I receieved an error: can't load jdbc driver class:
null.
The following steps were what I did:
1.Set up SQL Server and create a few tables and users.
2.Config Server.xml
Add the following codes in /tomcat/conf/Server.xml
<Context path="/persistence" docBase="persistence" debug="0"
reloadable="true">
          <Resource name="jdbc/persistenceDB" auth="Container"
type="javax.sql.DataSource"/>
          <ResourceParams name="jdbc/PersistenceDB">
               <Parameter>
                    <name>user</name>
                    <value>kitty</value>
               </Parameter>
               <Parameter>
                    <name>password</name>
                    <value>abc</value>
               </Parameter>
               <Parameter>
                    <name>driverClassName</name>
                    <value>com.microsoft.jdbc.sqlserver.SQLServerDriver</value>
               </Parameter>
               <Parameter>
                    <name>url</name>
<value>jdbc:microsoft:sqlserver://localhost:1433;databaseName=persistence;selectMethod=cursor;</value>
               </Parameter>
          </ResourceParams>
</Context>
3.Config my web application's web.xml
Added the following piece of code in WEB.XML
<resource-ref>
<res-ref-name>jdbc/persistenceDB</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
4.Use Datasource in my code
package persistence.database;
import java.sql.*;
import javax.naming.InitialContext;
import javax.sql.DataSource;
import javax.servlet.ServletContext;
import persistence.*;
import com.microsoft.jdbcx.sqlserver.*;
import javax.naming.Context;
public class DatabaseAuthenticator implements Authenticator {
private DataSource ds;
public void init(ServletContext sctx) throws Exception {
InitialContext init = new InitialContext();
try{
     Context ctx = (Context) init.lookup("java:/comp/env");
ds = (DataSource) ctx.lookup("jdbc/persistenceDB");
} catch (Exception e) { e.printStackTrace();
public User authenticate(String username, String password)
throws AuthenticationException, UnknownException {
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs;
try {
if (ds != null) {System.out.println("Success to get
datasource");
        } else {System.out.println("Failed");}
System.out.println(ds.toString());
try
conn = ds.getConnection();
catch (Exception e)
e.printStackTrace();
pstmt = conn.prepareStatement("SELECT user_id " + .........
5. put msutil.jar, mssqlserver.jar and msbase.jar under /tomcat/common/lib/.
When I tried to run the program, I receieved an error: can't load jdbc
driver class: null.
I've got no idea what's going on.
Any Suggestion?
Thanks in advance
Kitty

Hi Kitty,
The connection you're trying to set up points to nothing :
Connection conn = null;
So, you receive a complaint that that driver cannot be loaded. Please read
http://java.sun.com/docs/books/tutorial/jdbc/basics/connecting.html
download the right database driver and use that. Good luck!
Wouter van Reeven
public User authenticate(String username, String
g password)
throws AuthenticationException, UnknownException
ption {
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs;

Can't load jdbc driver from localhost

I'm having problems loading the jdbc driver from localhost when using a java com object in ASP.
The simple class compiles fine and runs perfect from dos command line but gives this exception when run from personal webserver:
java.lang.ClassNotFoundException: sun/jdbc/odbc/JdbcOdbcDriver
Obviously, it is not finding the jdbc driver, but what is the problem? It finds the driver when run from dos locally. Do I need a 3rd party driver when using as a COM object?
Here is a code snippet:
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection TestConnection = DriverManager.getConnection("jdbc:odbc:systemDSN", "username", "password");
Any help is appreciated, thanks!

I don't think it's exactly a classpath problem. I think when you run from the DOS command line, you are using the java.exe program that contains Sun's JVM and all the associated classes including sun/jdbc/odbc/JdbcOdbcDriver. But when you use this Java COM object (which I am not familiar with), if it doesn't find that class then it must be using the Microsoft VM, which naturally doesn't include that class you are having a problem with.

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?

Error loading JDBC driver

Hi,
I have an rpt file developed in crystal report 2008. it connects to SQL Server using ODBC(RDO) connection. I have a jsp file that needs to change the datasource to use JDBC (JNDI). The scriptlet for changing datasource is given below. I have my sqljdbc.jar in the web-inf\lib folder of my application as well as in \server\{server_name}\lib folder. when I try to run the jsp it gives me error as follows :
ERROR [com.businessobjects.reports.sdk.JRCCommunicationAdapter] detected an exception: Error loading JDBC driver. The class 'com.microsoft.jdbc.sqlserver.SQLServerDriver' could not be found.
     at com.crystaldecisions.reports.queryengine.Connection.t1(Unknown Source)
     at com.crystaldecisions.reports.dataengine.dfadapter.DFAdapter.a(Unknown Source)
     at com.crystaldecisions.reports.dataengine.dfadapter.DFAdapter.for(Unknown Source)
     at com.crystaldecisions.reports.reportdefinition.ReportHelper.a(Unknown Source)
     at com.businessobjects.reports.sdk.requesthandler.ReportViewingRequestHandler.long(Unknown Source)
     at com.businessobjects.reports.sdk.requesthandler.ReportViewingRequestHandler.a(Unknown Source)
     at com.businessobjects.reports.sdk.requesthandler.ReportViewingRequestHandler.byte(Unknown Source)
     at com.businessobjects.reports.sdk.JRCCommunicationAdapter.do(Unknown Source)
     at com.businessobjects.reports.sdk.JRCCommunicationAdapter.if(Unknown Source)
     at com.businessobjects.reports.sdk.JRCCommunicationAdapter.a(Unknown Source)
     at com.businessobjects.reports.sdk.JRCCommunicationAdapter$2.a(Unknown Source)
     at com.businessobjects.reports.sdk.JRCCommunicationAdapter$2.call(Unknown Source)
     at com.crystaldecisions.reports.common.ThreadGuard.syncExecute(Unknown Source)
     at com.businessobjects.reports.sdk.JRCCommunicationAdapter.for(Unknown Source)
     at com.businessobjects.reports.sdk.JRCCommunicationAdapter.int(Unknown Source)
     at com.businessobjects.reports.sdk.JRCCommunicationAdapter.request(Unknown Source)
     at com.businessobjects.sdk.erom.jrc.a.a(Unknown Source)
     at com.businessobjects.sdk.erom.jrc.a.execute(Unknown Source)
     at com.crystaldecisions.proxy.remoteagent.RemoteAgent$a.execute(Unknown Source)
     at com.crystaldecisions.proxy.remoteagent.CommunicationChannel.a(Unknown Source)
     at com.crystaldecisions.proxy.remoteagent.RemoteAgent.a(Unknown Source)
     at com.crystaldecisions.sdk.occa.report.application.ds.a(Unknown Source)
     at com.crystaldecisions.sdk.occa.report.application.ReportSource.a(Unknown Source)
     at ....
<br>
<br>
Scriptlet :
<%
//Report can be opened from the relative location specified in the CRConfig.xml, or the report location
//tag can be removed to open the reports as Java resources or using an absolute path (absolute path not recommended
//for Web applications).
final String DBUSERNAME = "sa";
final String DBPASSWORD = "password";
final String CONNECTION_STRING = "!com.microsoft.jdbc.sqlserver.SQLServerDriver!jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=;user=;password=";
final String TRUSTEDCON = "false";
final String PREQESERVERNAME = "jdbc:microsoft:sqlserver://localhost:1433";
final String SERVERTYPE = "JDBC (JNDI)";
final String DATABASE_DLL = "crdb_jdbc.dll";
final String DATABASE = "bssc";
final String DBCLASSNAME = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
final String USEJDBC = "true";
final String DATABASE_NAME = "bssc";
final String SERVERNAME = "jdbc:microsoft:sqlserver://localhost:1433";
final String CONNECTIONURL = "jdbc:microsoft:sqlserver://localhost:1433";
final String SERVER = "localhost";
%>
<%
          final Logger logger = Logger.getLogger(ReportAction.class.getName());
          final String REPORT_NAME = "../reports/Krt.rpt";
try {
          ReportClientDocument oReportClientDocument = new ReportClientDocument();
          oReportClientDocument.open(REPORT_NAME, 0);
     // Create the two connectioninfo objects to use
     IConnectionInfo oldConnectionInfo = new ConnectionInfo();
     IConnectionInfo newConnectionInfo = new ConnectionInfo();
     // Assign the old Connection info to the reports current info
     DatabaseController dbController = oReportClientDocument.getDatabaseController();
     oldConnectionInfo = dbController.getConnectionInfos(null).getConnectionInfo(0);
     // If this connection needed parameters, we would use this field.
     Fields pFields = null;
     // Create a new propertybag for the new location
     PropertyBag boPropertyBag1 = new PropertyBag();
     // Set new table logon properties
     boPropertyBag1.put("JDBC Connection String", CONNECTION_STRING);
     boPropertyBag1.put("Trusted_Connection", TRUSTEDCON);
     boPropertyBag1.put("PreQEServerName", PREQESERVERNAME);
     boPropertyBag1.put("Server Type", SERVERTYPE);
     boPropertyBag1.put("Database DLL", DATABASE_DLL);
     boPropertyBag1.put("Database", DATABASE);
     boPropertyBag1.put("Database Class Name", DBCLASSNAME);
     boPropertyBag1.put("Use JDBC", USEJDBC);
     boPropertyBag1.put("Database Name", DATABASE_NAME);
     boPropertyBag1.put("Server Name", SERVERNAME);
     boPropertyBag1.put("Connection URL", CONNECTIONURL);
     boPropertyBag1.put("Server", SERVER);
     // Assign the properties to the connection info
     newConnectionInfo.setAttributes(boPropertyBag1);
     // Set the DB Username and Pwd
     newConnectionInfo.setUserName(DBUSERNAME);
     newConnectionInfo.setPassword(DBPASSWORD);
     // The Kind of connectionInfos is SQL
     newConnectionInfo.setKind(ConnectionInfoKind.SQL);
     // set the parameters to replace.
     // The 4 options are:
     // _doNotVerifyDB
     // _ignoreCurrentTableQualifiers
     // _mapFieldByRowsetPosition
     // _useDefault
     int replaceParams = DBOptions._ignoreCurrentTableQualifiers + DBOptions._doNotVerifyDB;
     // Now replace the connections
     dbController.replaceConnection(oldConnectionInfo, newConnectionInfo, pFields, replaceParams);
%>
<%
//Report can be opened from the relative location specified in the CRConfig.xml, or the report location
//tag can be removed to open the reports as Java resources or using an absolute path (absolute path not recommended
//for Web applications).
final String DBUSERNAME = "sa";
final String DBPASSWORD = "password";
final String CONNECTION_STRING = "!com.microsoft.jdbc.sqlserver.SQLServerDriver!jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=;user=;password=";
final String TRUSTEDCON = "false";
final String PREQESERVERNAME = "jdbc:microsoft:sqlserver://localhost:1433";
final String SERVERTYPE = "JDBC (JNDI)";
final String DATABASE_DLL = "crdb_jdbc.dll";
final String DATABASE = "bssc";
final String DBCLASSNAME = "com.microsoft.jdbc.sqlserver.SQLServerDriver";
final String USEJDBC = "true";
final String DATABASE_NAME = "bssc";
final String SERVERNAME = "jdbc:microsoft:sqlserver://localhost:1433";
final String CONNECTIONURL = "jdbc:microsoft:sqlserver://localhost:1433";
final String SERVER = "localhost";
%>
<%
          final Logger logger = Logger.getLogger(ReportAction.class.getName());
          final String REPORT_NAME = "../reports/Krt.rpt";
try {
          ReportClientDocument oReportClientDocument = new ReportClientDocument();
          oReportClientDocument.open(REPORT_NAME, 0);
     // Create the two connectioninfo objects to use
     IConnectionInfo oldConnectionInfo = new ConnectionInfo();
     IConnectionInfo newConnectionInfo = new ConnectionInfo();
     // Assign the old Connection info to the reports current info
     DatabaseController dbController = oReportClientDocument.getDatabaseController();
     oldConnectionInfo = dbController.getConnectionInfos(null).getConnectionInfo(0);
     // If this connection needed parameters, we would use this field.
     Fields pFields = null;
     // Create a new propertybag for the new location
     PropertyBag boPropertyBag1 = new PropertyBag();
     // Set new table logon properties
     boPropertyBag1.put("JDBC Connection String", CONNECTION_STRING);
     boPropertyBag1.put("Trusted_Connection", TRUSTEDCON);
     boPropertyBag1.put("PreQEServerName", PREQESERVERNAME);
     boPropertyBag1.put("Server Type", SERVERTYPE);
     boPropertyBag1.put("Database DLL", DATABASE_DLL);
     boPropertyBag1.put("Database", DATABASE);
     boPropertyBag1.put("Database Class Name", DBCLASSNAME);
     boPropertyBag1.put("Use JDBC", USEJDBC);
     boPropertyBag1.put("Database Name", DATABASE_NAME);
     boPropertyBag1.put("Server Name", SERVERNAME);
     boPropertyBag1.put("Connection URL", CONNECTIONURL);
     boPropertyBag1.put("Server", SERVER);
     // Assign the properties to the connection info
     newConnectionInfo.setAttributes(boPropertyBag1);
     // Set the DB Username and Pwd
     newConnectionInfo.setUserName(DBUSERNAME);
     newConnectionInfo.setPassword(DBPASSWORD);
     // The Kind of connectionInfos is SQL
     newConnectionInfo.setKind(ConnectionInfoKind.SQL);
     // set the parameters to replace.
     // The 4 options are:
     // _doNotVerifyDB
     // _ignoreCurrentTableQualifiers
     // _mapFieldByRowsetPosition
     // _useDefault
     int replaceParams = DBOptions._ignoreCurrentTableQualifiers + DBOptions._doNotVerifyDB;
     // Now replace the connections
     dbController.replaceConnection(oldConnectionInfo, newConnectionInfo, pFields, replaceParams);
%>
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 PM

Hi,
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

Java.sql.SQLException: Cannot load JDBC driver class 'null'

Hi,
I am a beginner of using jdbc, i use the tomcat4.1.x, mysql3.23.54 and it's jdbc driver 2.0.14. I place the drive <in jar file> in tomcat/commons/lib and configure the server.xml, web.xml and some testing coding. But there are some error like the following:
java.sql.SQLException: Cannot load JDBC driver class 'null'
     at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:529)
     at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:312)
     at foo.DBTest.init(DBTest.java:18)
     at org.apache.jsp.test_jsp._jspService(test_jsp.java:48)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:136)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:204)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:289)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:240)
of course its some of the error code and there are more.
Why I have this problems and how can I fix it? Can someone help me??
Thanks,
Tong
I place my test.jsp at tomcat/webapps/DBTest and DBTest.java at tomcat/webapps/DBTest/WEB-INF/classes/foo
additional of the tomcat/conf/server.xml
<Resource name="TestDB" auth="Container" type="javax.sql.DataSource" description="MySQL TestDB"/>
<ResourceParams name="TestDB">
<parameter><name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
</parameter>
<parameter><name>maxActive</name><value>10</value></parameter>
<parameter><name>maxIdle</name><value>1</value></parameter>
<parameter><name>maxWait</name><value>10000</value></parameter>
<parameter><name>username</name><value>javauser</value></parameter>
<parameter><name>password</name><value>javadude</value></parameter>
<parameter>
<name>driverClassName</name>
<value>org.gjt.mm.mysql.Driver</value>
</parameter>
<parameter>
<name>url</name>
<value>jdbc:mysql://localhost:3306/javatest?autoReconnect=true</value>
</parameter>
</ResourceParams>
tomcat/webapps/DBTest/WEB-INF/web.xml :
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<description>MySQL Test App</description>
</web-app>

Post the part of your code that loads the driver and connects. My guess is you are using a variable for the name of the driver and the variable has not been set to anything(intially set to null).
Thanks
Cardwell

Initialization error: Loading jdbc driver

Hi ,
In a file-XI-JDBC scenario, i am getting this error. "Initialization error: Loading jdbc driver 'com.microsoft.jdbc.sqlserver.SQLServerDriver' failed: java.lang.ClassNotFoundException: com.microsoft.jdbc.sqlserver".
but i have installed/deployed third party SQL driver on J2ee server thru SDM.
Can any one sort out this problem.
Rgds
Sridhar

Hi,
try looking into the log viewer in Vsual Administrator. Usually you can find more information about the problem there.
Also try redeploying the driver again.
cheers,
naveen

Load JDBC driver in runtime

Hi all,
I'm trying to load mysql jdbc driver in runtime i've tried the following links
[http://dev-loki.blogspot.com/2008/01/loading-jdbc-driver-at-runtime.html]
[http://www.kfu.com/~nsayer/Java/dyn-jdbc.html]
[http://www.devdaily.com/java/edu/JDBC-SQLProcessor/Simple_JDBC_Example.shtml]
[http://tech.puredanger.com/2006/11/09/classloader/]
[http://fdt.powerflasher.com/blog/?p=35]
I'm not being able to get this to work it always given the classnotfoundexception
can anyone help please?
Thanks in advance

There is no server. I'm doing a normal java aplication, i wanted to have a folder where would be the jdbc drivers in runtime the user will choose what driver to load to access a some db.
I'm using eclipse and this is what i have now
import java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverPropertyInfo;
import java.sql.SQLException;
import java.util.Properties;
public class DriverShim implements Driver{
     private Driver driver;
     public DriverShim(Driver d) {
          this.driver = d;
     public boolean acceptsURL(String u) throws SQLException {
          return this.driver.acceptsURL(u);
     public Connection connect(String u, Properties p) throws SQLException {
          return this.driver.connect(u, p);
     public int getMajorVersion() {
          return this.driver.getMajorVersion();
     public int getMinorVersion() {
          return this.driver.getMinorVersion();
     public DriverPropertyInfo[] getPropertyInfo(String u, Properties p) throws SQLException {
          return this.driver.getPropertyInfo(u, p);
     public boolean jdbcCompliant() {
          return this.driver.jdbcCompliant();
               String libraryPath = System.getProperty("java.library.path");
          String sep = System.getProperty("path.separator");
          libraryPath = "." + sep + "C:/Users/Luis/Documents/eclipse/workspace/DBDIGGER/lib/connectors" + sep + "native" + sep + libraryPath;
          //libraryPath ="C:/Users/Luis/Documents/eclipse/workspace/DBDIGGER/lib/connectors";
          System.setProperty("java.library.path", libraryPath);
          System.out.println(libraryPath);
URL u;
          try {
               u = new URL("jar:file://C:/Users/Luis/Documents/eclipse/workspace/DB/lib/connectors/mysql-connector-java-5.1.7-bin.jar!/");
               String classname = Settings.MYSQL;
               URLClassLoader ucl = new URLClassLoader(new URL[] { u });
               URL[] ee =ucl.getURLs();
               Driver d = (Driver)Class.forName(classname, true, ucl).newInstance();
               DriverManager.registerDriver(new DriverShim(d));
               DriverManager.getConnection("jdbc:mysql://localhost:3306/mysql", "user", "pw");
          } catch (MalformedURLException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
          } catch (ClassNotFoundException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
          } catch (SQLException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
          } catch (InstantiationException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
          } catch (IllegalAccessException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
          } Project Folder Structure
DB
bin
lib
connectors
mysql-connector-java-5.1.7-bin.jar
src
result of classpath
.;C:/Users/Luis/Documents/eclipse/workspace/DBDIGGER/lib/connectors;native;C:\Program Files\Java\jre6\bin;.;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:/Program Files/Java/jre6/bin/client;C:/Program Files/Java/jre6/bin;C:\Program Files\JavaFX\javafx-sdk1.1\bin;C:\Program Files\JavaFX\javafx-sdk1.1\emulator\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Program Files\Intel\DMIX;C:\Program Files\Softex\OmniPass;C:\Program Files\MySQL\MySQL Server 5.1\bin
Maybe what i'm doing wrong is the classpath, this is not a web app is a standard java aplication...
Could someone explain to me how to set a classpath ?? correctly...

ZipException in Loading JDBC Driver

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)

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

Failed to load JDBC driver

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

How can i install jdbc driver

Hi
i install websphere 5 and try to connect to my sql server but cannot find jdbc driver class path and can not find any jdbc driver
pls tell me how can i install jdbc driver in my websphere
with regards

You may get a better response posting this question in a WebSphere specific forum. Maybe this will help, the following link shows the command you need to execute to install a JDBC driver in websphere 5.0.
http://publib.boulder.ibm.com/infocenter/wasinfo/index.jsp?tab=search&searchWord=mysql+driver&maxHits=50

Sun IDM Repositor Configuration Error: Failed to load JDBC Driver

Hi Gurus,
I am new to Java IDM and predictably failed in my first attempt to install Java IDM in a Windows machine with SQL Server 2000 SP3.
I followed the Installation document step by step and I think I din' t miss any!!.. But still I got caught by an error, here it is:
I successfully installed IDM but failed while configuring Repository. I have downloaded the JDBC driver from Microsoft for SQL Server 2000, SP3. Then after that I copied the Jar from JDBC driver folder to
%WSHOME%/bin/lib folder. After this I launched the Repository configuration setup.
I got the following error while trying to connect the waveset database with Repository type as SQL Server (JDBC Driver)
com.waveset.util.ConfigurationError: Failed to load JDBC Driver 'com.microsoft.sqlserver.jdbc.SQLServerDriver':
==> java.lang.ClassNotFoundException: com.microsoft.sqlserver.jdbc.SQLServerDriver
The Parameters that I have given for connection are:
URL: jdbc:sqlserver://127.0.0.1:1433;DatabaseName=waveset
JDBC Driver: com.microsoft.sqlserver.jdbc.SQLServerDriver
Connect as User: waveset
Connect Password: waveset
I have created the database and granted all access to user waveset.
Please help me come out of this. I tried dropping and recreating the database with a different name. Still it did not work, looks like it is a JDBC driver specific issue. Please guide me if I did anything wrong.
Appreciate any help
Thanks

Open your driver jar using winzip or something and check if the class: com.microsoft.sqlserver.jdbc.SQLServerDriver is present in the jar. I think you need to use a different class name. or your jar file is wrong. I think there are separate jars for SQL server 2000 and for SQL Server 2005.

Beginner Has Problem With Loading JDBC Driver Using MySQL

Hi, I am having problem with loading JDBC driver, and need your diagnotic help.
1. I have installed MySQL (C:\mysql), created a databse (soup), and created a littel table (VIDEOS). I am able to see the table in the console:
sql> select * from videos
2. I have downloaded the latest version of Connector/J (mysql-connector-java-3.1.0-alpha.zip), and unzip the zip file into my C:\ directory.
3. I copied the mysql-connector-java-3.1.0-alpha-bin.jar to the C:\j2sdk1.4.1_02\jre\lib\ext folder and it is in my CLASSPATH
4. MySQL server is running
C:\> C:\mysql\bin\mysqld-nt --standalone
5. open another DOS window and use the database
mysql>USE SOUP
6. succesfully compiled a Java program (javac Test.java):
import java.sql.* ;
public class Test
public static void main( String[] args )
try
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
try
Connection con = DriverManager.getConnection( "jdbc:mysql://localhost:3306/soup" );
try
Statement statement = con.createStatement();
ResultSet rs = statement.executeQuery("SELECT TITLE FROM VIDEOS");
while ( rs.next() )
System.out.println( rs.getString( "TITLE" ) );
rs.close();
statement.close();
catch ( SQLException e )
System.out.println( "JDBC error: " + e );
finally
con.close();
catch( SQLException e )
System.out.println( "could not get JDBC connection: " + e );
catch( Exception e )
System.out.println( "could not load JDBC driver: " + e );
7. when I run the Java program (java Test), I got
the message:
could not load JDBC driver: java.lang.ClassNotFoundException: org.gjt.mm.mysql.Driver
What am I missing?

Hi,
I missed to specify test in my last post.
Try running your program by explicitly setting the classspath when
running your program . java -classpath c:\mysql-connector-java-3.1.0-alpha-bin.jar test
Make sure your jar file contains org.gjt.mm.mysql.Driver class

Java.sql.SQLException: Cannot load JDBC driver

THis topic has been discussed many many times but I still not able to connect to Oracle 8i from my servlet using Tomcat 4.1.12 on hp-ux and java1.3
I always got: java.sql.SQLException: Cannot load JDBC driver class 'null'
In server.xml:
<Context Path="/MyApp" docBase="MyApp" debug="0" reloadable="true" >
<Resource name="jdbc/ora" auth="Container" type="javax.sql.DataSource"/> <ResourceParams name="jdbc/ora" >
<parameter>
<name>username</name>
<value>myname</value>
</parameter>
<parameter> <name>password</name>
<value>mypassword</value>
</parameter>
<parameter> <name>driverClassName</name>
<value>oracle.jdbc.driver.OracleDriver</value>
</parameter>
<parameter>
<name>url</name>
<value>jdbc:oracle:thin:@myhostname:1521:ora</value>
</parameter> </ResourceParams>
</Context>
In MyApp/WEB-INF/web.xml:
<resource-ref>
<res-ref-name>jdbc/ora</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</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

Can't load JDBC Driver

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