Hibernate - ClassNotFoundException: com.mysql.jdbc.Driver
Solution 1
Thanks to Reimeus for the answer. mysql-connector-java-5.1.26-bin.jar
needs to be in the runtime classpath.
Run -> Run Configurations... -> Classpath -> Add external JAR.
Clean everything, try again, and the Exception is gone.
Solution 2
For those who use Maven: add the following dependency in pom.xml.
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.17</version>
</dependency>
or choose another version from here.
Then you can get the artifact using:
mvn dependency:resolve
(if you don't use the IDE).
Solution 3
Faced the same issue with mysql-connector-java-5.1.48-bin.jar.
To fix this issue I changed the driver class name from
<property name="connection.driver_class">com.mysql.cj.jdbc.Driver</property>
to
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
Solution 4
In some cases it can be not a suitable solution to add jar
to classpath
via Run -> Run Configurations... -> Classpath -> Add external JAR.
First case
When the jar
file cannot be put into classpath
folder, there is alternative way to load class from the another place. You just need to instantiate URLClassLoader and then invoke loadClass()
on it (was mentioned here):
URLClassLoader urlCL = new URLClassLoader(new URL[] {"path_to_jar"});
Class driverClass = urlCL.loadClass("com.mysql.jdbc.Driver");
Second case
If you would like to add your class to classpath
at runtime (I prefer the answer of Ranjit Aneesh here), for this purpose you may create a very simple custom class loader extending URLClassLoader with the only overridden addUrl
method:
public class DynamicURLClassLoader extends URLClassLoader {
public DynamicURLClassLoader(URLClassLoader classLoader) {
super(classLoader.getURLs());
}
@Override
public void addURL(URL url) {
super.addURL(url);
}
}
Then invoke it:
URLClassLoader urlCL = (URLClassLoader) ClassLoader.getSystemClassLoader();
new DynamicURLClassLoader(urlCL).addURL("path_to_jar");
Solution 5
Faced the same issue with mysql-connector-java-5.1.48-bin.jar. To fix this issue I changed the driver class name from
com.mysql.cj.jdbc.Driver to
com.mysql.jdbc.Driver
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Comments
-
Arthur over 3 years
I'm trying to retrieve data from a MySQL database through Hibernate, but I'm stuck with this error:
Failed to create sessionFactory object.org.hibernate.service.classloading.spi.ClassLoadingException: Specified JDBC Driver com.mysql.jdbc.Driver could not be loaded java.lang.ClassNotFoundException: Could not load requested class : com.mysql.jdbc.Driver [...]
I use a class called DAOFactory to get the hibernate session:
public class DAOFactory { private static boolean isInstance = false; private static SessionFactory sessionFactory; private static ServiceRegistry serviceRegistry; private static Session session; private DAOFactory() throws ExceptionInInitializerError{ if( !isInstance ) { try { Configuration cfg = new Configuration().configure(); serviceRegistry = new ServiceRegistryBuilder().applySettings(cfg.getProperties()) .buildServiceRegistry(); sessionFactory = cfg.buildSessionFactory(serviceRegistry); } catch (Throwable ex) { System.err.println("Failed to create sessionFactory object."+ ex); throw new ExceptionInInitializerError(ex); } session = sessionFactory.openSession(); isInstance = true ; } } public static DAOFactory getInstance() { return new DAOFactory() ; } public Session getSession() { return session ; } }
hibernate.cfg.xml:
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory name=""> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="connection.url">jdbc:mysql://localhost:3306/enigma</property> <property name="connection.username">root</property> <property name="connection.password"></property> <property name="dialect">org.hibernate.dialect.MySQLDialect</property> <property name="connection.pool_size">1</property> <property name="current_session_context_class">thread</property> <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property> <property name="show_sql">true</property> <property name="hbm2ddl.auto">update</property> </session-factory> </hibernate-configuration>
And
mysql-connector-java-5.1.26-bin.jar
is already in the classpath:Does anyone see what I'm missing ?
-
Reimeus over 10 yearsAdd the jar to your runtime classpath
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Vaibhav Raj over 10 yearsIf you are working on a web application put the mysql-connector-java-5.1.26-bin.jar under lib folder.
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Eel Lee over 10 yearspossible duplicate of ClassNotFoundException com.mysql.jdbc.Driver
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Mark Rotteveel over 10 yearspossible duplicate of MySQL jdbc driver and Eclipse: ClassNotFoundexception com.mysql.jdbc.Driver
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Arthur over 10 yearsI am working on a JPA project, and the 2 previous questions aren't related. But thanks @Reimeus, it was just that.
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Joshua H about 7 yearsBeware that version 6 does not support JDK 1.7 anymore (dev.mysql.com/doc/connector-j/6.0/en/connector-j-versions.html)