Hello, I have an xsl - let's name it MAIN.XSL - that import another, located in a jar file : <xsl:import href="jar:file:/Users/cmarchand/devel/foe.jar!/path/to/file.xsl" /> This works perfectly, in Oxygen, with Saxon, everywhere. Now, if I change my <foe>/src/main/xsl/path/to/file.xsl file (inside or outside Oxygen), and rebuild the jar, when I come back to my MAIN.XSL, Oxygen displays an Error : I/O error reported by XML parser processing jar:file:/Users/cmarchand/devel/foe.jar!/path/to/file.xsl: JAR entry path/to/file.xsl not found in /Users/cmarchand/devel/foe.jar Of course, jar exists, is well formed, can be loaded by JVM, and file.xsl also exists, is also well formed, and is also correctly run by Saxon outside Oxygen. If I restart Oxygen, without changing foe.jar, everything works correctly. Problem exists from Oxygen 15 to 20.1 I think Matthieu Ricaud had previously reported this problem, but maybe verbally, at XMLPrague ... Thanks in advance, Christophe