WW-5616 - JakartaStreamMultiPartRequest warns on file delete if the file doesnt exist (#1591)

* Pull aspects into alignment with main/7.x+ AbstractMultiPartRequest.java
* Update JakartaMultiPartRequest and JakartaStreamMultiPartRequest to use isFile()
* Update cleanup text to mirror main/7.x+

Author: brianandle

core/src/main/java/org/apache/struts2/dispatcher/multipart/JakartaMultiPartRequest.java

@@ -373,10 +373,14 @@ public void cleanUp() {
                     if (item instanceof DiskFileItem) {
                         DiskFileItem diskItem = (DiskFileItem) item;
                         File storeLocation = diskItem.getStoreLocation();
-                        if (storeLocation != null && storeLocation.exists()) {
-                            LOG.debug("Deleting temporary file: [{}]", storeLocation.getName());
-                            if (!storeLocation.delete()) {
-                                LOG.warn("Unable to delete temporary file: [{}]", storeLocation.getName());
+                        if (storeLocation != null) {
+                            if(storeLocation.isFile()) {
+                                LOG.debug("Deleting file: {}", storeLocation.getName());
+                                if (!storeLocation.delete()) {
+                                    LOG.warn("There was a problem attempting to delete file: {}", storeLocation.getName());
+                                }
+                            } else {
+                                LOG.debug("File: {} already deleted", storeLocation.getName());
                             }
                         }
                     }

core/src/main/java/org/apache/struts2/dispatcher/multipart/JakartaStreamMultiPartRequest.java

@@ -79,10 +79,16 @@ public void cleanUp() {
                 try {
                     // catch any exceptions during cleanup to ensure all files are deleted.
                     File file = fileInfo.getFile();
-                    LOG.debug("Deleting file '{}'.", file.getName());
-                    if (!file.delete()) {
-                        LOG.warn("There was a problem attempting to delete file [{}].",
-                            file.getName());
+                    if(file != null) {
+                        if(file.isFile()) {
+                            LOG.debug("Deleting file: {}", file.getName());
+                            if (!file.delete()) {
+                                LOG.warn("There was a problem attempting to delete file: {}",
+                                    file.getName());
+                            }
+                        } else {
+                            LOG.debug("File: {} already deleted", file.getName());
+                        }
                     }
                 } catch (Exception e) {
                     LOG.warn("Error during cleanup of file item: [{}]", normalizeSpace(fileInfo.getOriginalName()), e);