定時器中實現數據庫表數據移動的功能，Exception in thread "Timer-0" isExist java.lang.NullPointerException定時器中線程報錯。

package com.shawnway.trade.marketdata.constants;
import java.sql.SQLException;
import java.util.Calendar;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import com.shawnway.trade.marketdata.services.ChartService;

@Component
public class TimerConfig {
        @Autowired
        private ChartService chartService;
        @PersistenceContext
        private  EntityManager em;
        public TimerConfig(ChartService ct){//關鍵點解決 null指針錯誤，
            chartService=ct;
        }
      // Timer.scheduleAtFixedRate(TimerTask task,Date firstTime,long period)
      //每天的24：00：00執行遷移操作
    public void init() {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, 15); // 控制時
        calendar.set(Calendar.MINUTE, 3);    // 控制分
        calendar.set(Calendar.SECOND, 0);    // 控制秒
     
        Date time = calendar.getTime();   
     
        Timer timer = new Timer();
        timer.scheduleAtFixedRate(new TimerTask() {
       
          public void run() {
              System.out.println("處理器開始運行");
              
            try {
                moveStableMes();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
          }
        }, time, 1000 * 60 * 60 * 24);// 這里設定將延時每天固定執行
    }
      @RequestMapping(value ="/move/moveStableMes", method = RequestMethod.GET)
      @ResponseBody
    public  void moveStableMes() throws SQLException{
        //首先判定存儲表是否存在，如果存在則轉移數據
        //如果不存在，先創建該存儲數據表，在轉移數據
        //情況臨時存儲表。（臨時表是用來保存當天的數據。）
        Calendar c = Calendar.getInstance();
        int year=c.get(c.YEAR);
        int month=c.get(c.MONTH)+1;
        int today = c.get(c.DAY_OF_MONTH);
        String tbname="";
        if(month<=9) 
            tbname="market_data_candlechart_"+Integer.toString(year)+"0"+Integer.toString(month);//數據庫的名字
        else 
            tbname="market_data_candlechart_"+Integer.toString(year)+Integer.toString(month);//數據庫的名字
        String temperTB="market_data_candlechart";//存儲臨時信息的表名
        System.out.println("執行到了isExist");
        boolean flag=chartService.isExist(tbname);//判定對應的數據庫是否存在
        System.out.println("isExist結束");
        if(flag){//如果已經存在了，就可以直接把臨時表中的數據插入到對應的表中
            chartService.moveMesToOldTB(tbname,temperTB);//將臨時表中的數據移動到tbname名稱的表中。    
        }else{
            chartService.createTemperTB(tbname);//如果不存在，需要先創建一個對應名稱的表
            chartService.moveMesToOldTB(tbname,temperTB);//將臨時表中的數據移動到tbname名稱的表中。
        }
        //轉移完數據后，清洗臨時表的數據
        chartService.deletTemperTB(temperTB);
    }
    
}

 

package com.shawnway.trade.marketdata;



import java.io.FileNotFoundException;

import org.apache.catalina.Server;
import org.apache.catalina.Service;
import org.apache.catalina.connector.Connector;
import org.apache.catalina.valves.RemoteIpValve;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.embedded.ConfigurableEmbeddedServletContainer;
import org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer;
import org.springframework.boot.context.embedded.tomcat.TomcatConnectorCustomizer;
import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;

import com.shawnway.trade.marketdata.constants.SystemConfig;
import com.shawnway.trade.marketdata.constants.TimerConfig;
import com.shawnway.trade.marketdata.core.collect.MarketDataCollectHandler;
import com.shawnway.trade.marketdata.core.ctp.CTPApiHandler;
import com.shawnway.trade.marketdata.core.ctp.CTPGatewayProxy;
import com.shawnway.trade.marketdata.core.ctp.CTPMarketDataHandler;
import com.shawnway.trade.marketdata.core.ctp.CTPZeroMQHandler;
import com.shawnway.trade.marketdata.core.es.EsMarketDataHandler;
import com.shawnway.trade.marketdata.core.es.EsunnyApiHandler;
import com.shawnway.trade.marketdata.core.es.EsunnyGatewayProxy;
import com.shawnway.trade.marketdata.core.sp.SharppointApiHandler;
import com.shawnway.trade.marketdata.core.sp.SharppointGatewayProxy;
import com.shawnway.trade.marketdata.core.sp.SpMarketDataHandler;
import com.shawnway.trade.marketdata.services.ChartService;
import com.shawnway.trade.marketdata.services.MapContainer;

@PropertySource({ "file:${config.dir}/config/web.properties" })
@SpringBootApplication
public class ApplicationLauncher {
    @Autowired
    private Environment env;
    @Autowired
    private ChartService chartService;
    
    @Bean(name = { "timerConfig" }, initMethod = "init")
    public TimerConfig timerConfig() {
        System.out.println("timerConfig已經開始運行了~");
        return new TimerConfig(chartService);//

chartService傳入進去，解決空指針的錯誤

 } 51 public static void main(String[] args) throws Exception { 52 System.setProperty("config.dir", System.getProperty("user.dir")); 53 final String dir = System.getProperty("config.dir"); 54 System.setProperty("logging.config", dir + "/config/logging.xml"); 55 SpringApplication.run(ApplicationLauncher.class, args); 56  } 57 }