Fix migrations of Functions

src/main/kotlin/fr/postgresjson/utils/searchSqlFiles.kt

@@ -5,6 +5,7 @@ import org.slf4j.Logger
 import org.slf4j.LoggerFactory
 import java.net.URI
 import java.net.URL
+import java.nio.file.FileSystemNotFoundException
 import java.nio.file.FileSystems
 import java.nio.file.FileVisitOption
 import java.nio.file.Files
@@ -16,11 +17,15 @@ fun URL.searchSqlFiles() = this.toURI().searchSqlFiles()
 fun URI.searchSqlFiles() = sequence<Resource> {
     val logger: Logger = LoggerFactory.getLogger("sqlFilesSearch")
     val uri: URI = this@searchSqlFiles
+    logger.debug("""SQL files found in "${uri.toString().substringAfter('!')}" :""")
     if (uri.scheme == "jar") {
-        val relativePath = uri.toString().substringAfter('!')
-        FileSystems
-            .newFileSystem(uri, emptyMap<String, Any>())
-            .getPath(relativePath)
+        try {
+            FileSystems.getFileSystem(uri)
+        } catch (e: FileSystemNotFoundException) {
+            FileSystems.newFileSystem(uri, emptyMap<String, Any>())
+        }
+
+        uri
             .walk(5)
             .asSequence()
             .filter { it.fileName.toString().endsWith(".sql") }