Error: com.microsoft.sqlserver.jdbc.SQLServerException: The connection is closed

Question

每当我重新启动 Tomcat 服务器时，我的 Web 服务代码第一次运行正常并生成结果但是从第二次开始它抛出以下错误

com.microsoft.sqlserver.jdbc.SQLServerException: The connection is closed.

只有在finally 块中添加try catch finally 语句并关闭连接后才会出现此错误。下面是我的代码。我不知道问题出在哪里。如果你能帮助我，我将不胜感激。

package com.CIBIL;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import com.CIBIL.dao.InitialiseCIBILDatabaseConnection;
import com.CIBIL.xmldom.AddressType;
import com.CIBIL.xmldom.ApplicantInfo;
import com.CIBIL.xmldom.BanktypeType;
import com.CIBIL.xmldom.CredithistoryType;
import com.CIBIL.xmldom.IdentityType;
import com.CIBIL.xmldom.PersonalType;

public class RetrieveData {
 
 String sqlquery = null;
 Connection repositoryDatabaseConnection = null; 
 ResultSet queryResult = null;
 PreparedStatement sqlToFetch = null;
 
 public ApplicantInfo retrievalApplicantData(String AadhaarNumber) throws Exception{
   
  repositoryDatabaseConnection = InitialiseCIBILDatabaseConnection.getFrameworkRepositoryDatabaseConnection();
  
  try {
   
   sqlquery = "Select a.[aadharid], p1.[pan], p2.[firstname], p2.[lastname], p2.[addressline1], p2.[addressline2], p2.[addressline3], " +
          "p2.[addressline4], p2.[addressline5], p2.[addressline6], p2.[city], p2.[state], p2.[pincode], p2.[country], p2.[mobile], p2.[DOB], " +
          "b.[bank_name] ,b.[bank_account] ,b.[ifsc_code],chs.[ccj] , chs.[defaults], chs.[bankrupt], chs.[cheque_fail], chs.[credit_score] " +
          "from [CIBIL].[dbo].[cibil_customer_aadharid] a " +
          "join [CIBIL].[dbo].[cibil_customer_pan] p1 on a.aadharid = p1.aadharid " +
          "join [CIBIL].[dbo].[cibil_customer_personal] p2 on p1.pan = p2.pan " +
          "join [CIBIL].[dbo].[cibil_customer_bank] b on p1.pan = b.pan " +
          "join [CIBIL].[dbo].[cibil_credit_hostory_and_score] chs on p1.pan = chs.pan " +
          "Where p1.aadharid = '"+ AadhaarNumber + "';";
   
   sqlToFetch = repositoryDatabaseConnection.prepareStatement(sqlquery);
   ResultSet queryResult = sqlToFetch.executeQuery();

   ApplicantInfo ApplicantObject = new ApplicantInfo();
   IdentityType IdentityObject = new IdentityType();
   PersonalType PersonalObject = new PersonalType();
   AddressType AddressObject = new AddressType();
   BanktypeType BankObject = new BanktypeType();
   CredithistoryType CreditObject = new CredithistoryType();
   
   while(queryResult.next())
   {
     
    IdentityObject.setAadhaarNumber(queryResult.getString("aadharid"));
    IdentityObject.setPanNumber(queryResult.getString("pan"));
    PersonalObject.setFirstName(queryResult.getString("firstname"));
    PersonalObject.setLastName(queryResult.getString("lastname"));
    AddressObject.setAddressline1(queryResult.getString("addressline1"));
    AddressObject.setAddressline2(queryResult.getString("addressline2"));
    AddressObject.setAddressline3(queryResult.getString("addressline3"));
    AddressObject.setAddressline4(queryResult.getString("addressline4"));
    AddressObject.setAddressline5(queryResult.getString("addressline5"));
    AddressObject.setAddressline6(queryResult.getString("addressline6"));
    AddressObject.setCity(queryResult.getString("city"));
    AddressObject.setState(queryResult.getString("state"));
    AddressObject.setPincode(queryResult.getString("pincode"));
    AddressObject.setCountry(queryResult.getString("country"));
    PersonalObject.setMobile(queryResult.getString("mobile"));
    PersonalObject.setDob(queryResult.getString("DOB"));
    BankObject.setBankName(queryResult.getString("bank_name"));
    BankObject.setBankAccountNumber(queryResult.getString("bank_account"));
    BankObject.setBankIFSCCode(queryResult.getString("ifsc_code"));
    CreditObject.setCcj(queryResult.getString("ccj"));
    CreditObject.setBankdefault(queryResult.getString("defaults"));
    CreditObject.setBankruptcy(queryResult.getString("bankrupt"));
    CreditObject.setChequeBounce(queryResult.getString("cheque_fail"));
    CreditObject.setFinalCreditScore(queryResult.getString("credit_score"));
    
    ApplicantObject.setApplicantIdentityInfo(IdentityObject);
    ApplicantObject.setApplicantPersonalInfo(PersonalObject);
    ApplicantObject.setApplicantAddressInfo(AddressObject);
    ApplicantObject.setApplicantBankInfo(BankObject);
    ApplicantObject.setApplicantCreditHistoryInfo(CreditObject);
   }
   
   return ApplicantObject;

  } catch (Exception e) {
   e.printStackTrace();
  } 
  finally{
   if (queryResult != null) {
          try {
           queryResult.close();
          } catch (SQLException e) { /* ignored */}
      }
      if (sqlToFetch != null) {
          try {
           sqlToFetch.close();
          } catch (SQLException e) { /* ignored */}
      }
      if (repositoryDatabaseConnection != null) {
          try {
           repositoryDatabaseConnection.close();
          } catch (SQLException e) { /* ignored */}
      }
  }
  return null;
  
 }
}

Answer 1

您应该使用 PreparedStatement 和绑定变量。

学习如何使用 JNDI 数据源的最佳选择是 Tomcat documentation。

Error: com.microsoft.sqlserver.jdbc.SQLServerException: The connection is closed

Error: com.microsoft.sqlserver.jdbc.SQLServerException: The connection is closed

java

web-services

sql-server-2014

tomcat9