Updating a .jar file

I have a Java .jar file (Saxon-HE-9.8.0-7.jar). I want to modify this .jar file.

My first attempt was to add a new class to it. All seemed to go well, until I tested it, and the calling program insisted it could not find the new class.

This was my new class:

package net.sf.saxon;

public class TransformerFactoryImpl2 extends TransformerFactoryImpl
{
	public TransformerFactoryImpl2()
	{
	    this.setAttribute("http://saxon.sf.net/feature/ignoreSAXSourceParser", true);
	}
}

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I compiled it at a Windows Command Line using javac.exe

 java.exe -cp Saxon-HE-9.8.0-7.jar TransformerFactoryImpl2.java

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This created file TransformerFactoryImpl2.class

Then I added this new class to the .jar file:

jar uf Saxon-HE-9.8.0-7.jar TransformerFactoryImpl2.class

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Did I miss a step? Is there a manifest somewhere I need to add this new class to?


Since this approach did not work, my next idea was to modify the original class. I disassembled the original class, modified it, recompiled it using the same technique as above, then updated the jar file using the same technique as above. I then unzipped the resulting jar file, and found I had two copies of file TransformerFactoryImpl.class in two different places: the original class where it belonged in the net\sf\saxon directory, and my new class in the top level directory.


What step am I missing?