Add trace log when resource isn't an archive

When detect(...) fails to resolve an archive file (archiveFile == null), the method now emits a trace-level log containing the resource URL before returning null. The log is guarded by logger.isTraceEnabled() to avoid unnecessary formatting overhead. No other behavior changes.

Author: mercyblitz

microsphere-java-core/src/main/java/io/microsphere/classloading/ArtifactDetector.java

@@ -138,6 +138,9 @@ public Artifact detect(@Nonnull Class<?> classInResource) {
     public Artifact detect(@Nonnull URL resourceURL) {
         File archiveFile = resolveArchiveFile(resourceURL);
         if (archiveFile == null) {
+            if (logger.isTraceEnabled()) {
+                logger.trace("The URL[{}] is not an archive file, no artifact was found!", resourceURL);
+            }
             return null;
         }
         URL classPathURL = execute(archiveFile.toURI()::toURL);