oracle.jdbc.driver.T4CConnection.getSchema() exception

version

oracle:Oracle 11g
java:1.8

pom.xml

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <java.version>1.8</java.version>
    <maven.compiler.source>${java.version}</maven.compiler.source>
    <maven.compiler.target>${java.version}</maven.compiler.target>
  </properties>
  <dependencies>
    <dependency>
      <groupId>com.oracle</groupId>
      <artifactId>ojdbc6</artifactId>
      <version>11.2.0.3</version>
    </dependency>
  </dependencies>

code

package snippet;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class ConnectiongetSchemaErrorTest {
  public static void main(String[] args) {
    String driver = "oracle.jdbc.driver.OracleDriver";
    String url = "jdbc:oracle:thin:@xx:8095/orcl";
    String user = "xx";
    String pswd = "xx";

    try {
      Class.forName(driver);
    } catch (ClassNotFoundException e) {
      e.printStackTrace();
    }

    Connection connection = null;
    try {
      connection = DriverManager.getConnection(url, user, pswd);
      System.out.println(connection.getClass().getName());
      String schema = connection.getSchema();
      System.out.println(schema);
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      try {
        connection.close();
      } catch (SQLException e) {
        e.printStackTrace();
      }
    }
  }
}

error

oracle.jdbc.driver.T4CConnection
Exception in thread "main" java.lang.AbstractMethodError: oracle.jdbc.driver.T4CConnection.getSchema()Ljava/lang/String;
    at snippet.ConnectiongetSchemaErrorTest.main(ConnectiongetSchemaErrorTest.java:24)