oracle 10g xe Lsnrctl服务和ora-12519错误

Question

在窗口7上安装了10g xe。我是jdbc和10g xe的新手。当使用一个简单的程序测试连接机智jdbc它工作正常，但当我尝试使用应用程序将一些数据存储到数据库时，它显示错误：ORA-12519：TNS：找不到合适的服务处理程序。当我通过互联网挖掘时，我发现lsnrctlr服务可能存在一些问题。我经历了这个网站上与ora-12519错误相关的其他帖子。但是没有帮助解决问题。请帮助。以下代码工作正常。没有任何错误或例外。

   import  java.sql.*;
   public class OracleThinConnection {
   public static void main(String args[]) {
     try {
       Class.forName("oracle.jdbc.driver.OracleDriver");
       Connection con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","SYSTEM","tiger");
       Statement stmt = con.createStatement ();
       ResultSet rset = stmt.executeQuery ("SELECT * FROM emp");
       while (rset.next ())
       System.out.println (rset.getString (1));
       rset.close();
       stmt.close();
       con.close();
       System.out.println("Connected Successfully To Oracle");
      }
     catch(Exception ex) {
    ex.printStackTrace();
    }
   }
  }

但是当我执行以下代码时，它会显示ora-12519错误

   try{
    Class.forName("oracle.jdbc.driver.OracleDriver");
        Connection con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","SYSTEM","tiger");
       Statement s = con.createStatement ();
   String str1=" create table " + s2.charAt(0) + "drive(fname varchar(256), fpath varchar(256), modifiedtime date,accesstime date,creationtime date,fsize numeric(20,0),owner varchar(256))"; //s2 is the drive name
   System.out.println(str1);
   s.execute(str1); 
   s.close();
   con.close();
    funInsertion(f[i],s2.charAt(0)+"drive"); // this function does the job of inserting the files in the drive to the corresponding drive table
     }
 catch(Exception e){ System.out.println("exception " +e);} 
  }

funInsertion（）如下

 public void funInsertion(File f,String s1){
 String skip="";
 try{
 if(f.isDirectory()){
 dir++;
 File [] fi=f.listFiles();
 for(int i=0;i<fi.length;i++){
    if(fi[i].getName().equals("Program Files")){
       skip=fi[i].getParent();
       break;
      }

}
  for(int i=0;i<fi.length;i++){
    if(fi[i].getAbsolutePath().equals(skip)){}
  else
      funInsertion(fi[i],s1); 
   }
  }
  else{
    if(f.getAbsolutePath().equals(skip)){}
 else{
     files++;
  Path file = Paths.get(f.getAbsolutePath());                                 
      BasicFileAttributes attrs = Files.readAttributes(file, BasicFileAttributes.class); 
    try{
     Class.forName("oracle.jdbc.driver.OracleDriver");
         Connection con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","SYSTEM","tiger");
        Statement s = con.createStatement ();
    s.execute("insert into " + s1 + " values('" + f.getName() + "','" + f.getAbsolutePath() + "','"+attrs.lastModifiedTime()+"','"+attrs.lastAccessTime()+"','"+attrs.creationTime()+"','"+attrs.size()+"','"+Files.getOwner(f.toPath())+"')");

    s.close();
    con.close();
     } 
         catch(Exception e){ System.out.println("exception " +e);}
     }
    }
  }
   catch(Exception e){
 }
}

当我检出lsnrctlr服务时显示以下消息