private static Connection getDBConnection() {

    Connection dbConnection = null;
    try {

        Class.forName(DB_DRIVER);
    } catch (ClassNotFoundException e) {
        System.out.println(e.getMessage());
    }

    try {
        dbConnection = DriverManager.getConnection(
                DB_CONNECTION, DB_USER, DB_PASSWORD);
        return dbConnection;
    } catch (SQLException e) {
        System.out.println(e.getMessage());
    }
    return dbConnection;

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE Configure PUBLIC "-//Mort Bay Consulting//DTD Configure//EN"    "http://www.eclipse.org/jetty/configure_9_0.dtd">
<Configure id='wac' class="org.eclipse.jetty.webapp.WebAppContext">

<New id="DSTest" class="org.eclipse.jetty.plus.jndi.Resource">
    <Arg><Ref refid="wac"/></Arg>
    <Arg>jdbc/DSTest</Arg>
    <Arg>
        <New class="oracle.jdbc.pool.OracleDataSource">
            <Set name="DriverType">thin</Set>
            <Set name="URL">jdbc:oracle:system:thin:@localhost:1521:xe</Set>
            <Set name="User">mylogin</Set>
            <Set name="Password">mypass</Set>
        </New>
    </Arg>
</New>

</Configure>

<resource-ref>
    <description>My DataSource Reference</description>
    <res-ref-name>jdbc/DSTest</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
</resource-ref>

private static Connection connTest() throws NamingException, SQLException {

    Context initContext = new InitialContext();
    DataSource dataSource = (DataSource) initContext.lookup("java:comp/env/jdbc/DSTest");
    System.out.println(dataSource);
    System.out.println(dataSource.toString());
    Connection connection = dataSource.getConnection();
    return connection;
}


@POST
@Path("/testinsert")
@Consumes(MediaType.APPLICATION_JSON)
public Response testinsert(SimpleJsonModel simpleJsonModel) {

    String result = "JSON saved test: " + simpleJsonModel;

    try {
        insertRecord(simpleJsonModel.getJsonId(), simpleJsonModel.getNumber());
    } catch (SQLException e) {
        System.out.println(e.getMessage());
    }

    return Response.status(201).entity(result).build();
}

private static void insertRecord(String val1, String val2) throws SQLException {

    Connection dbConnection = null;
    Statement statement = null;
    String insertTableSQL = "insert into json.johny_table ( jsonId, numberJ) values ('" + val1 + "', '" + val2 + "')";

    try {
        dbConnection = connTest();
        statement = dbConnection.createStatement();
        System.out.println(insertTableSQL);
        statement.executeUpdate(insertTableSQL);
        System.out.println("inserted");

    } catch (SQLException e) {
        System.out.println(e.getMessage());
    } catch (NamingException e) {
        e.printStackTrace();
    } finally {

        if (statement != null) {
            statement.close();
        }
        if (dbConnection != null) {
            dbConnection.close();
        }
    }
}
}

<Set name="URL">jdbc:oracle:system:thin:@localhost:1521:xe</Set>

<Set name="URL">jdbc:oracle:thin:@localhost:1521:xe</Set>