下面是我的代码，运行一段时间总是报这个错误

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import java.io.*;
import java.net.InetAddress;
import java.net.Socket;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.text.SimpleDateFormat;

public class ServerThread extends Thread {
Socket socket = null;
private final static String URL = "jdbc:sqlserver://XXXXXXXXX;DatabaseName=XXX_DB";
private static final String USER = "XXXX";//sa
private static final String PASSWORD = "XXXXXXXX";//123,qwe
InetAddress inetAddress=null;//接收客户端的连接
// ServerThread d = new ServerThread(socket, inetAddress);
private static Connection conn=null;

//静态代码块（将加载驱动、连接数据库放入静态块中）
static{
try {

//1.加载驱动程序
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
//2.获得数据库的连接
conn=(Connection)DriverManager.getConnection(URL,USER,PASSWORD);
}
catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
}


//对外提供一个方法来获取数据库连接
public static Connection getConnection(){
return conn;
}

//插入
public void insert(Statement stmt,String sql) throws SQLException {
//成功-返回false
// boolean execute = stmt.execute("insert into 李运辰.选课 values(1,2,100)");

boolean execute = stmt.execute(sql);
System.out.println(execute);
}
/////////////////////////////////////////////
public ServerThread(Socket socket,InetAddress inetAddress) {
this.socket = socket;
this.inetAddress=inetAddress;
}

@Override
public void run() {
InputStream inputStream = null;//字节输入流
InputStreamReader inputStreamReader = null;//将一个字节流中的字节解码成字符
BufferedReader bufferedReader = null;//为输入流添加缓冲
OutputStream outputStream = null;//字节输出流
OutputStreamWriter writer = null;//将写入的字符编码成字节后写入一个字节流
DataInputStream in = null;
try {
inputStream = socket.getInputStream();
inputStreamReader = new InputStreamReader(inputStream, "UTF-8");
bufferedReader = new BufferedReader(inputStreamReader);
String info = null;//临时

//循环读取客户端信息
while ((info = bufferedReader.readLine()) != null) {
//获取客户端的ip地址及发送数据
System.out.println("服务器端接收："+"{'from_client':'"+socket.getInetAddress().getHostAddress()+"','data':'"+info+"'}");


in = new DataInputStream(socket.getInputStream());
byte[] recvBytes = new byte[2048];
String TagID;
String Status;
String temp;
String rep_TagID = null;
// GAO217001Sample d = new GAO217001Sample();
// Statement stmt = conn.createStatement();
// SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
do
{

in.read(recvBytes);

//Judge data head
if ((recvBytes[0]==66)
&&(recvBytes[1]==73)
&&(recvBytes[2]==83)
&&(recvBytes[3]==65)
&&(recvBytes[4]==95)
&&(recvBytes[5]==82)
&&(recvBytes[6]==70)
&&(recvBytes[7]==73)
&&(recvBytes[8]==68)
&&(recvBytes[9]==0))
{
//Judge data package type
if ((recvBytes[14]==1) || (recvBytes[14]==21) && (recvBytes[15]==0))
{
//starting from byte[48], every 13 byte is a reading record
for (int i=0;i<(recvBytes[13]*256+recvBytes[12]-48)/13;i++)
{
TagID = "";
Status = "";

//Find Tag ID;
for (int j=0;j<8;j++)
{
temp = Integer.toHexString(recvBytes[i*13+j+48]);
if (temp.length() == 1)
temp = "0"+temp;
TagID = TagID + temp;
}

//Find Status
Status = Integer.toHexString(recvBytes[i*13+8+48]);
if(TagID.contains("fff")) {
//System.out.println("含ff的TagID:"+TagID);
// System.out.println("去掉ff的TagID:"+TagID.replace("ffffff", ""));
rep_TagID = TagID.replace("ffffff", "");
}
else {
System.out.println("不含ff的TagID:"+TagID);
rep_TagID=TagID;
}

System.out.println("Status:"+Status+"\r\n");
ServerThread d = new ServerThread(socket, inetAddress);
Statement stmt = conn.createStatement();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String ss = "insert into R_data(tagid,state,Riftime,ReaderIP) values('"+rep_TagID+"','"+Status+"',getdate(),'"+socket.getInetAddress().getHostName()+"')";
System.out.println(df.format(System.currentTimeMillis())+": "+ss);
d.insert(stmt, "insert into R_data(RCode,tagid,state,Riftime,ReaderIP) values('001002','"+rep_TagID+"','"+Status+"',getdate(),'"+socket.getInetAddress().getHostName()+"')");
stmt.close();
}
}
}
}
while(true);



}

socket.shutdownInput();//关闭输入流

//响应客户端请求
// outputStream = socket.getOutputStream();
// writer = new OutputStreamWriter(outputStream, "UTF-8");
// writer.write("{'to_client':'"+inetAddress.getHostAddress()+"','data':'我是服务器数据'}");
// writer.flush();//清空缓冲区数据
} catch (IOException e) {
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
//关闭资源
try {
if (writer != null) {
writer.close();
}
if (outputStream != null) {
outputStream.close();
}
if (bufferedReader != null) {
bufferedReader.close();
}
if (inputStreamReader != null) {
inputStreamReader.close();
}
if (inputStream != null) {
inputStream.close();
}
if (socket != null) {
socket.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}

}
}