Fix single Log4j2Plugins.dat isn't included into fat jar (#1039)

Co-authored-by: Przemysław Książek <[email protected]>
Co-authored-by: Zongle Wang <[email protected]>

src/docs/changes/README.md

@@ -11,6 +11,10 @@
 
 - **BREAKING CHANGE:** Remove Develocity integration. ([#1013](https://github.com/GradleUp/shadow/pull/1013))
 
+**Fixed**
+
+- Fix single Log4j2Plugins.dat isn't included into fat jar. ([#1039](https://github.com/GradleUp/shadow/issues/1039)).  
+
 
 ## [v8.3.5] (2024-11-03)
 

src/main/kotlin/com/github/jengelman/gradle/plugins/shadow/transformers/Log4j2PluginsCacheFileTransformer.kt

@@ -53,9 +53,7 @@ public open class Log4j2PluginsCacheFileTransformer : Transformer {
     // This functionality matches the original plugin, however, I'm not clear what
     // the exact logic is. From what I can tell temporaryFiles should be never be empty
     // if anything has been performed.
-    val hasTransformedMultipleFiles = temporaryFiles.size > 1
-    val hasAtLeastOneFileAndRelocator = temporaryFiles.isNotEmpty() && relocators.isNotEmpty()
-    return hasTransformedMultipleFiles || hasAtLeastOneFileAndRelocator
+    return temporaryFiles.isNotEmpty() || relocators.isNotEmpty()
   }
 
   override fun modifyOutputStream(os: ZipOutputStream, preserveFileTimestamps: Boolean) {

src/test/groovy/com/github/jengelman/gradle/plugins/shadow/transformers/Log4j2PluginsCacheFileTransformerSpec.groovy

@@ -25,12 +25,12 @@ class Log4j2PluginsCacheFileTransformerSpec extends Specification {
         transformer = new Log4j2PluginsCacheFileTransformer()
     }
 
-    void "should not transformer"() {
+    void "should transform for a single file"() {
         when:
         transformer.transform(new TransformerContext(PLUGIN_CACHE_FILE, getResourceStream(PLUGIN_CACHE_FILE)))
 
         then:
-        !transformer.hasTransformedResource()
+        transformer.hasTransformedResource()
     }
 
     void "should transform"() {