Cannot delete after editing .properties file

This is my jsp code for saving back the data to .properties file after editing. i used 2 Linked properties as one LinkedProperties pro is to get the data from the path and the other one to get attribute (eg: id, name, age, gender etc.) from default .properties file so that i don't have to hard code everything in every page:

String path = request.getParameter("path");
	System.out.println(path);
	File dir = new File(path);
	FileInputStream in = new FileInputStream(dir);
	LinkedProperties pro = new LinkedProperties();
	pro.load(in);
	Enumeration em = pro.keys();
			
	//default file
	File d_dir = new File("C:/workspace_indigo/Configuration/WebContent/default.properties");
	LinkedProperties d_pro = new LinkedProperties();
	FileInputStream d_in = new FileInputStream(d_dir);
	d_pro.load(d_in);
	Enumeration ems = d_pro.keys();
			
	//save to file.
			if (request.getParameter("id") != null) {
				while (ems.hasMoreElements()){
					String str = (String) ems.nextElement();
					pro.setProperty(str, request.getParameter(str));	
				}
				pro.store(new FileOutputStream(path), null);%>
				
			<script type="text/javascript">
				alert("Change Saved sucessfully.");
				//window.location.href="List_of_Repo.jsp";
			</script>
				
		<% 	}
			d_pro.clear();
			d_in.close();
                        pro.clear();
		        in.close();

I can save the file back into the corresponding .properties file but the problem is i cannot delete the file after editing is save. The error message is the file is still in used.

help me.