This question already has answers here:
Connect Java to a MySQL database
(14 answers)
Closed 6 years ago.
I am a newbie to J2EE.I have checked similar questions but nothing helped.
I am creating a simple login application but i am facing the above error.
I have mysqlconnector in build path and a lib folder as shown in the image :SQL connector
The source code of the application is as follows:
LoginDao.java
This file connects the application to mysql database.
String userName = "root";
String password = "mysql";
I have provided the username and password of mysql here.Is this correct?
For this I have created a database in mysql:
create database form;
use form;
create table login(username varchar(20),pass varchar(20));
show tables;
insert into login values("nehal",12345);
Now the project runs properly but when i enter username as nehal and password:12345, it gives the above error:
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
1 way =>Paste the mysqlconnector.jar file in jre/lib/ext folder.
2 way => set classpath
open comman prompt and write:- C:>set classpath=c:\folder\mysql-connector-java-5.0.8-bin.jar;.;
in IDE :
Right Click the
project -- > build path -- > configure build path
In Libraries Tab press Add External Jar and Select your jar.
Don't know eclipse that much but i would guess that your library is mussing at runtime. As i see you use apache tomcat and it seems that it doesn't has that mysql jar.
You have to add that jar to your apache tomcat. See Where do I have to place the JDBC driver for Tomcat's connection pool?
Related
Unable to start server for Derby in IDE 15.
Tried to use Derby version 14, didn't work. Tried to change the location of the folder, didn't work.
When I press start server, it just hangs there, does no further processing.
Unresolved NetBeans Bug NETBEANS-3424 Unable to use Derby DB version 10.15.1.3 in Netbeans 11.2 looks relevant to your problem, though you are using different software releases of Derby, Java and NetBeans and your issue is with starting the server rather than establishing a connection.
I can reproduce the connection failure issue on NetBeans 15 using JDK 19 and Derby 10.16.1.1. After selecting the sample database connection jdbc:derby://localhost:1527/sample [app on APP] and selecting Connect... from the context menu this error is displayed:
Although that linked bug report is open and unresolved, a helpful user posted a workaround in the comments so that a suitable driver can be found:
In the Services panel in NetBeans select the entry Databases > Drivers > Java DB (Embedded), right click and select Customize... from the context menu.
The Customize JDBC Driver window will be displayed.
Click the Add... button three times to add the jars derbytools.jar, derbyshared.jar and derbyoptionaltools.jar from the lib directory of your Derby installation (which is named C:\Apache\db-derby-10.16.1.1-bin in my case, but yours is almost certainly something else).
After doing that your Customize JDBC Driver window for your Java DB (Embedded) driver should look similar to this:
Similarly, for the Databases > Drivers > Java DB (Network) entry add the jars derbytools.jar and derbyshared.jar so that your Customize JDBC Driver window looks like this:
After adding those jars to the two drivers you should immediately be able to connect to the APP database using the connection jdbc:derby://localhost:1527/sample [app on APP], and view its tables:
Notes:
You are using Java 8 which is unsupported in NetBeans 15. Update your IDE to use JDK 11 or greater.
You don't need to explicitly start the server by selecting Databases > Java DB > Start Server. Instead, just select Connect... for jdbc:derby://localhost:1527/sample [app on APP]
I am trying to migrate from MySQL to PostgreSQL and I have a Java-related problem that I am not able to fix. Full disclosure: I know little or nothing about Java, but the migration uses a Java-based script, so for me it becomes a configuration problem.
Short version of the problem:
The migration tool throws this exception:
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
mysql-connector-java-5.0.8-bin.jar is already in the "JAVA_HOME\jre\lib\ext" directory, and I don't know how to solve this depencency problem.
Long version of the problem:
I was trying to migrate from MySQL to PostgreSQL. I checked the official postgresql documentation and I chose the free tool from entreprisedb (that can be downloaded here) to start the migration.
From the installation readme, they tell you that the mysql connector is not installed by default, but they also tell you the steps to solve this problem:
To enable MySQL connectivity, download MySQL's freely available JDBC driver from:
http://www.enterprisedb.com/downloads/third-party-jdbc-drivers
Place the mysql-connector-java-5.0.8-bin.jar file in the "JAVA_HOME\jre\lib\ext" directory (in my case: "C:\Program Files\Java\jre1.8.0_60\lib\ext\mysql-connector-java-5.0.8-bin.jar").
After configuring the tool properly and executing the .bat, this is the error I get:
Connecting with source MySQL database server...
MTK-11009: Error Connecting Database "MySQL Server"
DB-null: java.sql.SQLException: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
Stack Trace:
com.edb.MTKException: MTK-11009: Error Connecting Database "MySQL Server"
at com.edb.dbhandler.mysql.MySQLConnection.<init>(MySQLConnection.java:48)
at com.edb.common.MTKFactory.createMTKConnection(MTKFactory.java:250)
at com.edb.MigrationToolkit.createNewSourceConnection(MigrationToolkit.java:5982)
at com.edb.MigrationToolkit.initToolkit(MigrationToolkit.java:3346)
at com.edb.MigrationToolkit.main(MigrationToolkit.java:1700)
Caused by: java.sql.SQLException: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at com.edb.Utility.processException(Utility.java:327)
at com.edb.dbhandler.mysql.MySQLConnection.<init>(MySQLConnection.java:47)
... 4 more
...which, to my understanding, probably means that mysql-connector-java-5.0.8-bin.jar is not found.
All the links I've found online regarding the error are specific for Eclipse or other IDEs, so I have not yet been able to solve this dependency problem.
SOLUTION
With the help of a friend that masters Java, this is the solution he achieved:
To start looking for the problem, we opened the runMTK.bat. The execution line reads:
cscript //nologo "..\etc\sysconfig\runJavaApplication.vbs" "..\etc\sysconfig\edbmtk-49.config" "-Dprop=..\etc\toolkit.properties -classpath -jar edb-migrationtoolkit.jar %*"
So then we opened this runJavaApplication.vbs, and in order to know the JAVA_EXECUTABLE_PATH that the program was using, we add this line to the script:
Wscript.Echo "JAVA_EXECUTABLE_PATH = " & JAVA_EXECUTABLE_PATH
With that info, we discover that the script is using the Java folder under C:\Program Files (x86), instead of the one under C:\Program Files (where I dropped the mysql jar). So we copy the mysql-connector-java-5.0.8-bin.jar in the \ext folder of the x86, and now the script works.
Word of advice: the script is throwing errors in half of the exported tables, so all the hassle may not be worth it. BUT if anyone is interested in making this migration script work from A to Z (which has been quite a challenge), here are the details:
HOW TO
Free tool (from entreprisedb):
http://www.enterprisedb.com/downloads/postgres-postgresql-downloads
Extract the files from the zip and fun the installer (ppasmeta-9.5.0.5-windows-x64.exe) as administrator.
To enable MySQL connectivity, download MySQL's freely available JDBC driver from:
http://www.enterprisedb.com/downloads/third-party-jdbc-drivers
Place the mysql-connector-java-5.0.8-bin.jar file in the "JAVA_HOME\jre\lib\ext" directory (in my case: "C:\Program Files\Java\jre1.8.0_60\lib\ext\mysql-connector-java-5.0.8-bin.jar").
The Migration Toolkit documentation can be found:
here (online doc): https://www.enterprisedb.com/docs/en/9.4/migrate/toc.html
or here (pdf doc): http://get.enterprisedb.com/docs/Postgres_Plus_Migration_Guide_v9.5.pdf
First: modify C:\Program Files\PostgresPlus\edbmtk\etc\toolkit.properties (Info here):
SRC_DB_URL=jdbc:mysql://SOURCE-HOST-NAME/SOURCE-DB-NAME
SRC_DB_USER=********
SRC_DB_PASSWORD=********
TARGET_DB_URL=jdbc:edb://localhost:5444/DESTINATION-DB-NAME
TARGET_DB_USER=enterprisedb
TARGET_DB_PASSWORD=********
Then: execute C:\Program Files\PostgresPlus\edbmtk\bin\runMTK.bat (Info here).
runMTK.bat -sourcedbtype mysql -targetdbtype enterprisedb -allTables YOUR_DB_SCHEMA
// ...or with a limited subset of tables:
runMTK.bat -sourcedbtype mysql -targetdbtype enterprisedb -tables TABLE1,TABLE2,TABLE3 YOUR_DB_SCHEMA
In order to get this subset of tables from MySQL:
SELECT
GROUP_CONCAT(TABLE_NAME)
FROM
information_schema.tables
WHERE
TABLE_SCHEMA = 'your_db_name'
This question already has an answer here:
Class [org.apache.derby.jdbc.ClientDriver] not found. When trying to connect to db
(1 answer)
Closed 7 years ago.
![JAVADB_DRIVER_LABEL library missing][1]
I am trying to connect to a JavaDB through netbeans 8 IDE on Windows 7. i can connect it using the DB manager provided with netbeans in Services panel. But when trying to connect it through my code I get ClassNotFoundException for the org.apache.derby.jdbc.ClientDriver class.
I could not run the Apache tomcat server on my machine, so I am Using the Glassfish server 4 that comes with netbeans.
my code to connect to the DB is as follows:
String url = "jdbc:derby://localhost:1527/sample;UID=app;PWD=app";
Class.forName("org.apache.derby.jdbc.ClientDriver");
conn = DriverManager.getConnection(url);
This similar code worked with SQL server, MS Access.
Please add your jdbc driver to the classpath of your project. It should work.
Currently, the class loader is unable to load your driver class as it does it does not find it in the classpath
Download the version of Apache Derby you need from here. Extract the zip and you should get derbyclient.jar which has the class org.apache.derby.jdbc.ClientDriver.
FYI : If your application runs on JDK 1.6 or higher, then you do not need to explicitly load the EmbeddedDriver. In that environment, the driver loads automatically.
You need to add derbyclient.jar to your classpath. You can find this jar in the download package of derby from here. This jar contains your org.apache.derby.jdbc.ClientDriver.
For more information, see this answer : where is org.apache.derby.jdbc.ClientDriver?
This question already has answers here:
No suitable driver found for 'jdbc:mysql://localhost:3306/mysql [duplicate]
(8 answers)
Closed 8 years ago.
I'm trying to connect my Java program to a database, but for some reason I'm getting an exception telling me there's No suitable driver found.
This is the code I use to connect:
Class.forName("com.mysql.jdbc.Driver");
java.sql.Connection connect = DriverManager.getConnection("jdbc:mysql//localhost:3307/miku");
PreparedStatement statement = connect.prepareStatement("SELECT * FROM users");
ResultSet result = statement.executeQuery();
Does anyone see what the problem is?
You need to add MySQL connector driver jar. Download it from here and add it to your classpath.
PS : If you are using Java 7 you don't even have to write Class.forName("com.mysql.jdbc.Driver");. it will automatically be loaded from the classpath. So just add your driver jar file to the classpath.
Just add mysql connector jar. If you using Netbeans right click on the Libraries folder on project and then add library. There is library called MySql JDBC Driver and add it.
This question already has answers here:
How to install JDBC driver in Eclipse web project without facing java.lang.ClassNotFoundexception
(13 answers)
Closed 7 years ago.
I am using Java/Eclipse to connect to MySQL database but encountering the following error.
Error Message:
Unable to connect to databasejava.lang.ClassNotFoundException: com.mysql.jdbc.Driver
Code:
<%
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection myCon = DriverManager.getConnection("jdbc:mysql://localhost/myDB", "root", "password");
if(! myCon.isClosed())
out.println("Successfully connected to " + "MySQL server!");
myCon.close();
}catch(Exception ex){
out.println("Unable to connect to database" + ex);
}
%>
I know that this question has already been asked here but still I am unable to sort this thing out.
Environmental variables:
JAVA_HOME: C:\Program Files\Java\jdk1.7.0_51
CLASSPATH: .%JAVA_HOME%\lib;C:\Program Files\MySQL\Connector J 5.1.29;
How can I can solve this issue?
The Eclipse project doesn't know where you have the drivers for the database. You need to include them under the WEB-INF/lib directory so that they become part of the classpath.
Inside tomcat the external definitions do not apply.
Either deploy the driver jar with your application or add it to the extension library inside Tomcat. I would use the first if Tomcat is not expected to help you with e.g. connection pools or similar
if you are using eclipse then add MySQL jars in projects lib folder.
Yes it worked for me also for the error as
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver.
Copied the sql connector jar file to lib folder of web-inf .
After copying this, the value from html to mysql database is sucessfully inserted
Thanks for the Help