How to add a single file to an existing jar

Hey all...
Just a small problem.
What is the command for adding a single (updated) class file to an already existing jar. I have tried with
jar u Generator.jar \PATHTOFILE\Generator.class
And the jartool just seems to do nothing.. No cpu or disk activity.
Can anyone see what's wrong. Or just tell me another way of doing it.
Thanks in advance to all posts...

You can use any zip tool to do the same thing, such as Winzip. Open the archive with Winzip and just add the new file. The only key is you need make sure you have the path correct, for packaging reasons.
For example, if you have a class in package com.CompanyX.product, you need to make sure that the path in Winzip shows as com.CompanyX.product

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import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.sql.*;
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super.init(config);
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FileOutputStream fileOut= null;
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if (conn==null){pass=false;}
} catch (Exception e){out.println("<P>" + "There was an error establishing a connection:");}
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try
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statement = conn.createStatement();
ResultSet rset = statement.executeQuery(seq_nextval);
while (rset.next())
next_id = rset.getString(1);
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} catch (Exception e1) { out.println("Error blob1 : "+e1.toString()); };
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try
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",filename "+
",mimetype "+
",kb) "+
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",'"+mimeType+"'"+
","+kb_size+")";
stmt2.executeQuery(insert_empty_blob);
conn.commit();
if (stmt2!= null) {stmt2.close();}else{stmt2.close();pass = false;}
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out.println("Error blob 4: "+e4.toString());
message = "Uploaden mislukt !...Er ging wat fout tijdens de interactie met de database";
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try
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                         int iLength = -1;
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responseRedirect = "/forum/error.jsp?message="+message;
out.println("Request not multipart/form-data.");
catch(Exception e)
try
//print error message to standard out
out.println("Error in doPost: " + e);
//send error message to client
out.println("An unexpected error has occurred.");
out.println("Error description: " + e);
}catch (Exception f) {}
response.sendRedirect(responseRedirect);
public void doGet(HttpServletRequest request,
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