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

Question

I am trying get the default database name from the connection for oracle

The following code gives me this abstract method error. Can anyone suggest me how I can get default database name using jdbc?

environmental information 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)

Answer 1

getSchema() method is only available in Java 7 and above but ojdbc6.jar is compiled with Java 6 where as ojdbc8.jar is compiled with Java 8 . Either use ojdbc8.jar or alternatively you can try the code below with ojdbc6.jar

   // For ojdbc6.jar
   String schema= connection.getMetaData().getUserName();
   System.out.println("Schema Name is : " + schema);

   or 
 
    DatabaseMetaData dbmd = connection.getMetaData();
   String schema=dbmd.getUserName();
   System.out.println("Schema Name is : " + schema);
 

Answer 2

The official supported Oracle JDBC versions from 11.2.0.4, 12.2.0.2, 18.3.0.0, 19.3.0.0,19.6.0.0, and 19.7.0.0 are available on Central Maven Repository. Refer to Maven Central Guide for more details.

It is recommended to use the latest version. Check out FAQ for JDK compatibility.