Error while uploading files in database through plugin

I am getting error after navigating to servlet url is that 

java.lang.IllegalStateException: Unable to process parts as no multi-part configuration has been provided

I correctly written servlet url in .xml file 

CourseSchedule.java

@WebServlet("/CourseSchedule")

@MultipartConfig()
@@Named("CourseSchedule"
public class CourseSchedule extends HttpServlet
{
@ComponentImport
private TemplateRenderer tr;
@ComponentImport
private PageBuilderService pbs;
@ComponentImport
private ActiveObjects ao;

@Inject
public CourseSchedule(TemplateRenderer tr, PageBuilderService pbs,ActiveObjects ao)
{
this.tr=tr;
this.pbs=pbs;
this.ao=ao;
}

@Override
protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException
{

tr.render("/templates/adminOperations/courseSchedule.vm", response.getWriter());

Connection con=null;
Statement st=null;
String msg=null;
String url="jdbc:mysql://localhost:3306/LU_Data?useSSL=false";
String user="root";
String password="123456";

Random rand = new Random();
int n = rand.nextInt(9999) + 1;
String idTemp=(String.valueOf(n));

String semesterName=request.getParameter("semesterName");
Part part=request.getPart("scheduleFile");

PrintWriter pw=response.getWriter();
pw.print(semesterName);

InputStream is=null;

if(part != null)
{
long fileSize=part.getSize();
String fileContent=part.getContentType();
is=part.getInputStream();
}

try
{
Class.forName("com.mysql.cj.jdbc.Driver");

con=DriverManager.getConnection(url, user, password);

PreparedStatement pst=con.prepareStatement("INSERT INTO Course_schedule VALUES(?,?,?)");
pst.setString(1, semesterName);
pst.setString(2, idTemp);

pst.executeUpdate();

if(is!=null)
{
pst.setBinaryStream(3, is, (int) part.getSize());
}

int row=pst.executeUpdate();

if(row==0)
{
pw.print("Error in Uploading a file");
}
else
{
pw.print("File Uploaded Successfully");

}

}
catch(SQLException e)
{
e.printStackTrace();
} catch (ClassNotFoundException e)
{
e.printStackTrace();
}
finally
{
if(con!= null)
try {
con.close();
}catch(SQLException e) {e.printStackTrace();}
}
}

courseSchedule.vm

<html>
<head>
<title>Course Schedule</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<center>
<h1>Upload Course Schedule</h1>
<form action="CourseSchedule" method="post" enctype="multipart/form-data">
<table border="0">
<tr>
<td>Semester Name</td>
<td><input type="text" name="semesterName" size="50"/></td>
</tr>
<tr>
<td>Course Schedule File </td>
<td><input type="file" name="scheduleFile" size="50"/></td>
</tr>
<tr>
<td colspan="2">
<input type="submit" value="Upload">
</td>
</tr>
</table>
</form>
</center>
<center>
</center>
</body>
</html>

 

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