No ocijdbc21 in java.library.path

Explanation:

The “no ocijdbc21 in java.library.path” error is encountered when the Oracle JDBC driver is not properly configured or cannot be found in the java.library.path. This error usually occurs when using Java to connect to an Oracle database.

To resolve this issue, you need to ensure that the Oracle JDBC driver is set up correctly in your Java environment. Here are the steps you can follow:

1. Check the Oracle JDBC driver version: Make sure you have the appropriate version of the Oracle JDBC driver. The version number should match the version of your Oracle database. You can download the Oracle JDBC driver from the Oracle website.
2. Add the Oracle JDBC driver JAR file to your project: Once you have the Oracle JDBC driver JAR file, you need to add it to your Java project’s classpath. This can be done by either placing the JAR file in your project’s lib directory or adding it as a dependency in your build tool (e.g., Maven, Gradle).

   
   <dependencies>
      <dependency>
         <groupId>com.oracle.database.jdbc</groupId>
         <artifactId>ojdbc8</artifactId>
         <version>21.1.0.0</version>
      </dependency>
   </dependencies>
            

3. Set the java.library.path system property: The “java.library.path” system property should be set to the directory containing the Oracle Instant Client shared libraries. This can be done using the “-Djava.library.path” command-line option when running your Java application or by programmatically setting the system property in your code.

   
   System.setProperty("java.library.path", "/path/to/oracle/instantclient");
            

4. Load the Oracle JDBC driver: Before making a database connection, you need to load the Oracle JDBC driver class using the Class.forName() method. This ensures that the driver class is registered with the DriverManager.

   
   Class.forName("oracle.jdbc.OracleDriver");
            

5. Establish the database connection: Finally, you can establish a connection to your Oracle database using the appropriate JDBC URL, username, and password.

   
   String url = "jdbc:oracle:thin:@//hostname:port/service";
   String username = "your_username";
   String password = "your_password";
   
   Connection connection = DriverManager.getConnection(url, username, password);
            

By following the above steps, you should be able to resolve the “no ocijdbc21 in java.library.path” error and successfully connect to your Oracle database using Java.