8321183: Incorrect warning from cds about the modules file

Backport-of: fd31f6a1663de0e06accdf015a71086346aa0d98

Author: cost0much

src/hotspot/share/cds/filemap.cpp

@@ -412,23 +412,25 @@ bool SharedClassPathEntry::validate(bool is_class_path) const {
       log_warning(cds)("directory is not empty: %s", name);
       ok = false;
     }
-  } else if ((has_timestamp() && _timestamp != st.st_mtime) ||
-             _filesize != st.st_size) {
-    ok = false;
-    if (PrintSharedArchiveAndExit) {
-      log_warning(cds)(_timestamp != st.st_mtime ?
-                                 "Timestamp mismatch" :
-                                 "File size mismatch");
-    } else {
-      const char* bad_jar_msg = "A jar file is not the one used while building the shared archive file:";
-      log_warning(cds)("%s %s", bad_jar_msg, name);
-      if (!log_is_enabled(Info, cds)) {
-        log_warning(cds)("%s %s", bad_jar_msg, name);
-      }
-      if (_timestamp != st.st_mtime) {
-        log_warning(cds)("%s timestamp has changed.", name);
+  } else {
+    bool size_differs = _filesize != st.st_size;
+    bool time_differs = has_timestamp() && _timestamp != st.st_mtime;
+    if (time_differs || size_differs) {
+      ok = false;
+      if (PrintSharedArchiveAndExit) {
+        log_warning(cds)(time_differs ? "Timestamp mismatch" : "File size mismatch");
       } else {
-        log_warning(cds)("%s size has changed.", name);
+        const char* bad_file_msg = "This file is not the one used while building the shared archive file:";
+        log_warning(cds)("%s %s", bad_file_msg, name);
+        if (!log_is_enabled(Info, cds)) {
+          log_warning(cds)("%s %s", bad_file_msg, name);
+        }
+        if (time_differs) {
+          log_warning(cds)("%s timestamp has changed.", name);
+        }
+        if (size_differs) {
+          log_warning(cds)("%s size has changed.", name);
+        }
       }
     }
   }

test/hotspot/jtreg/runtime/cds/appcds/WrongClasspath.java

@@ -108,7 +108,7 @@ public static void main(String[] args) throws Exception {
     // message should be there.
     output = TestCommon.execAuto(
         "-cp", jars, "Hello");
-    output.shouldMatch("A jar file is not the one used while building the shared archive file:.*jar2.jar")
+    output.shouldMatch("This file is not the one used while building the shared archive file:.*jar2.jar")
           .shouldMatch(".warning..cds.*jar2.jar timestamp has changed.");
   }
 }

test/hotspot/jtreg/runtime/cds/appcds/dynamicArchive/MainModuleOnly.java

@@ -204,7 +204,7 @@ public static void doTest(String topArchiveName) throws Exception {
             "--module-path", moduleDir.toString(),
             "-m", TEST_MODULE1)
             .assertAbnormalExit(
-                "A jar file is not the one used while building the shared archive file:");
+                "This file is not the one used while building the shared archive file:");
         // create an archive with a non-empty directory in the --module-path.
         // The dumping process will exit with an error due to non-empty directory
         // in the --module-path.

test/hotspot/jtreg/runtime/cds/appcds/dynamicArchive/WrongTopClasspath.java

@@ -111,7 +111,7 @@ static void test(String args[]) throws Exception {
                 "assertNotShared:GenericTestApp") // but top archive is not useable
           .assertNormalExit(output -> {
               output.shouldContain(topArchiveMsg);
-              output.shouldMatch("A jar file is not the one used while building the shared archive file:.*GenericTestApp.jar");
+              output.shouldMatch("This file is not the one used while building the shared archive file:.*GenericTestApp.jar");
               output.shouldMatch(".warning..cds.*GenericTestApp.jar timestamp has changed.");});
     }
 }

test/hotspot/jtreg/runtime/cds/appcds/jigsaw/modulepath/MainModuleOnly.java

@@ -65,7 +65,7 @@ public class MainModuleOnly {
     private static Path moduleDir2 = null;
     private static Path destJar = null;
 
-    private static final String jarFileError = "A jar file is not the one used while building the shared archive file:";
+    private static final String jarFileError = "This file is not the one used while building the shared archive file:";
 
     public static void buildTestModule() throws Exception {