[bugfix] Normalise Log4j2 config path to file: URI for cross-platform compatibility

Log4j2 cannot resolve a bare Windows path set via the log4j2.configurationFile system property. Converting to a file: URI ensures correct resolution on all platforms.

Author: Laurettta

exist-start/src/main/java/org/exist/start/Main.java

@@ -284,10 +284,11 @@ public void runEx(String[] args) throws StartException {
             if (existHomeDir.isPresent() && Files.exists(existHomeDir.get().resolve(CONFIG_DIR_NAME))) {
                 log4jConfigurationFile = existHomeDir.map(f -> f.resolve(CONFIG_DIR_NAME).resolve("log4j2.xml"));
             }
+        }
 
-            if (log4jConfigurationFile.isPresent() && Files.isReadable(log4jConfigurationFile.get())) {
-                System.setProperty(PROP_LOG4J_CONFIGURATION_FILE, log4jConfigurationFile.get().toAbsolutePath().toString());
-            }
+        // Always normalise to a file:/ URI so log4j can resolve it on all platforms (especially Windows)
+        if (log4jConfigurationFile.isPresent() && Files.isReadable(log4jConfigurationFile.get())) {
+            System.setProperty(PROP_LOG4J_CONFIGURATION_FILE, log4jConfigurationFile.get().toAbsolutePath().toUri().toString());
         }
 
         if (log4jConfigurationFile.isPresent()) {