java - Connection Manage File Throw Exception. please provide solution .thanks -

code-1 : (working fine)

package com.connection; import java.sql.*;  public class sqlserverjdbc {  public static void main(string[] args) {      try     {         string server,user,password,database;         int port;         string jdbcurl;          server="admin-pc";         port =1433;         user="sa";         password="admin@123";         database="ordd_login_db";          class.forname("com.microsoft.sqlserver.jdbc.sqlserverdriver");         system.out.println("#- driver load");         jdbcurl="jdbc:sqlserver://"+server+":"+port+";user="+user+";password="+password+";databasename="+database+";";         system.out.println("constring="+jdbcurl);           connection con=drivermanager.getconnection(jdbcurl);         system.out.println("# - connection obtained");           statement stmt=con.createstatement();         system.out.println("# - statment obtained");          resultset rs=stmt.executequery("select * userinfo;");         system.out.println("# - query executed");          if (rs.next())         {             system.out.println("output colume = "+rs.getstring(1));         }          rs.close();stmt.close();con.close(); system.out.println("resource relised......done");        }catch(exception e)     {         system.out.print(e);     } }  } 

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code-2 (not working)

package com.connection; import java.sql.*;  public class sqlserverjdbc {  public static connection getconnection() {     connection con = null;      try     {         string server,user,password,database,jdbcurl;         int port;         server="admin-pc";port =1433;user="sa";password="admin@123";database="ordd_login_db";          class.forname("com.microsoft.sqlserver.jdbc.sqlserverdriver");         system.out.println("#- driver load");          jdbcurl="jdbc:sqlserver://"+server+":"+port+";user="+user+";password="+password+";databasename="+database+";";         system.out.println("constring="+jdbcurl);            con=drivermanager.getconnection(jdbcurl);         system.out.println("# - connection obtained");        }catch(exception e)     {         system.out.print(e);     }     system.out.println(con);     return con; } }  

error massage:

java.lang.classnotfoundexception: com.microsoft.sqlserver.jdbc.sqlserverdriver null java.lang.nullpointerexception