src/hotspot/share/memory/filemap.cpp

*** 204,223 ****
--- 204,227 ----
    _verify_remote = BytecodeVerificationRemote;
    _has_platform_or_app_classes = ClassLoaderExt::has_platform_or_app_classes();
  }
  
  void SharedClassPathEntry::init(const char* name, TRAPS) {
+   assert(DumpSharedSpaces, "dump time only");
    _timestamp = 0;
    _filesize  = 0;
  
    struct stat st;
    if (os::stat(name, &st) == 0) {
      if ((st.st_mode & S_IFMT) == S_IFDIR) {
        _is_dir = true;
      } else {
        _is_dir = false;
+       // The timestamp of the modules_image is not checked at runtime.
+       if (!ClassLoader::is_modules_image(name)) {
          _timestamp = st.st_mtime;
+       }
        _filesize = st.st_size;
      }
    } else {
      // The file/dir must exist, or it would not have been added
      // into ClassLoader::classpath_entry().
*** 235,244 ****
--- 239,251 ----
  bool SharedClassPathEntry::validate(bool is_class_path) {
    assert(UseSharedSpaces, "runtime only");
  
    struct stat st;
    const char* name = this->name();
+   if (ClassLoader::is_modules_image(name)) {
+     name = ClassLoader::get_jrt_entry()->name(); // use the runtime modules_image path
+   }
    bool ok = true;
    log_info(class, path)("checking shared classpath entry: %s", name);
    if (os::stat(name, &st) != 0 && is_class_path) {
      // If the archived module path entry does not exist at runtime, it is not fatal
      // (no need to invalid the shared archive) because the shared runtime visibility check
*** 249,272 ****
    } else if (is_dir()) {
      if (!os::dir_is_empty(name)) {
        FileMapInfo::fail_continue("directory is not empty: %s", name);
        ok = false;
      }
!   } else if (is_jar_or_bootimage()) {
!     if (_timestamp != st.st_mtime ||
          _filesize != st.st_size) {
        ok = false;
        if (PrintSharedArchiveAndExit) {
          FileMapInfo::fail_continue(_timestamp != st.st_mtime ?
                                     "Timestamp mismatch" :
                                     "File size mismatch");
        } else {
!         FileMapInfo::fail_continue("A jar/jimage file is not the one used while building"
                                     " the shared archive file: %s", name);
        }
      }
-   }
    return ok;
  }
  
  void SharedClassPathEntry::metaspace_pointers_do(MetaspaceClosure* it) {
    it->push(&_name);
--- 256,277 ----
    } else if (is_dir()) {
      if (!os::dir_is_empty(name)) {
        FileMapInfo::fail_continue("directory is not empty: %s", name);
        ok = false;
      }
!   } else if ((has_timestamp() && _timestamp != st.st_mtime) ||
               _filesize != st.st_size) {
      ok = false;
      if (PrintSharedArchiveAndExit) {
        FileMapInfo::fail_continue(_timestamp != st.st_mtime ?
                                   "Timestamp mismatch" :
                                   "File size mismatch");
      } else {
!       FileMapInfo::fail_continue("A jar file is not the one used while building"
                                   " the shared archive file: %s", name);
      }
    }
    return ok;
  }
  
  void SharedClassPathEntry::metaspace_pointers_do(MetaspaceClosure* it) {
    it->push(&_name);