Why am I getting a \"java.lang.ClassNotFoundException: com.mysql.jdbc.Driver\" error when connecting to MySQL?

Runtime Exception: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

Issue:

When attempting to execute a Java program that interacts with MySQL, users may encounter the runtime error "java.lang.ClassNotFoundException: com.mysql.jdbc.Driver." This exception indicates an inability to locate the necessary JDBC driver class, "com.mysql.jdbc.Driver," during runtime.

Cause:

The runtime exception occurs when the Java Virtual Machine (JVM) fails to load the MySQL JDBC driver class because it is either not present in the current classpath or the class has not been registered with the JVM.

Solution:

To resolve this issue, the JDBC driver library (in JAR format) must be added to the runtime classpath of the Java application.

Step 1: Acquire JDBC Driver Library

Download the appropriate JDBC driver library from the official MySQL website or a trusted repository. In this case, the MySQL Connector/J library is required.

Step 2: Add Library to Classpath

Modify the command used to run the Java program to include the path to the JDBC driver library as follows:

Windows:

java -cp .;C:\path\to\mysql-connector-java-5.1.25-bin.jar ClientBase

Linux/Unix:

java -cp .:/path/to/mysql-connector-java-5.1.25-bin.jar ClientBase

Note: Replace "ClientBase" with the actual name of the Java class containing the JDBC code.

Step 3: Verify Classpath

Ensure that the modified command includes the correct path to the JDBC driver library and that there are no typos or errors in the classpath.

Step 4: Restart Application

Re-run the Java program with the updated classpath. If the JDBC driver is successfully located, the application should execute without encountering the "java.lang.ClassNotFoundException: com.mysql.jdbc.Driver" error.

The above is the detailed content of Why am I getting a \"java.lang.ClassNotFoundException: com.mysql.jdbc.Driver\" error when connecting to MySQL?. For more information, please follow other related articles on the PHP Chinese website!