Oracle jdbc bug?

在Java 中执行下面SQL语句没有响应，DEBUG 无法跟踪代码，但此语句在SQL DEVELOPER 执行没问题，在Java代码中执行其他 SQL 语句基本也没问题。

更新：问题解决，原来是表被另外一个会话锁住了。

insert into T1 (ID, VALUE) select ID, VALUE from T2

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

import oracle.jdbc.driver.OracleDriver;

public class TestOracleUtil {

	public static void main(String[] args) throws SQLException {
		String sql = "insert into T1 (ID, VALUE) select ID, VALUE from T2";
		update(getConnection(), sql);
	}

	public static Connection getConnection() {
		new OracleDriver();
		String serverName = "192.168.1.3";
		String portNumber = "1521";
		String sid = "ORCL";
		String url = "jdbc:oracle:thin:@" + serverName + ":" + portNumber + ":"
				+ sid;
		String username = "test";
		String password = "test";
		try {
			Connection conn = DriverManager.getConnection(url, username,
					password);
			return conn;
		} catch (SQLException e) {
			e.printStackTrace();
			return null;
		}
	}
	
	static void update(Connection conn, String sql) throws SQLException{
		Statement smt = conn.createStatement();
		smt.executeUpdate(sql);
	}
}