小编Ele*_*ian的帖子

我正在尝试使用 Java SE 11 和 Gradle 7.0 构建应用程序，并且它使用 IDE 构建，但是当我尝试使用终端构建它时，我收到此错误。我该如何解决它。

java.lang.IllegalAccessError: class org.gradle.internal.compiler.java.ClassNameCollector (in unnamed module @0x1d7a8227) cannot access class com.sun.tools.javac.code.Symbol$TypeSymbol (in module jdk.compiler) because module jdk.compiler does not export com.sun.tools.javac.code to unnamed module @0x1d7a8227

我的 CSV 文件中有 270000 条记录，其中包含 user_id、book_ISBN 和 book_ rating 列，我需要将这些记录插入到多对多表中。我使用 openCSV 库解析数据，结果是一个列表。

public List<UserRatingDto> uploadRatings(MultipartFile file) throws IOException{
        BufferedReader fileReader = new BufferedReader(new
                InputStreamReader(file.getInputStream(), "UTF-8"));

        List<UserRatingDto> ratings = new CsvToBeanBuilder<UserRatingDto>(fileReader)
                .withType(UserRatingDto.class)
                .withSeparator(';')
                .withIgnoreEmptyLine(true)
                .withSkipLines(1)
                .build()
                .parse();
        return ratings;
    }

这不存在性能问题，解析大约需要 1 分钟。但是，为了将它们插入到表中，我需要从数据库中获取书籍和用户以形成关系，我尝试使该方法与 @Async 注释异步，我尝试了并行流，我尝试将对象放入放入堆栈并使用 saveAll() 批量插入，但仍然花费太多时间。

 public void saveRatings(final MultipartFile file) throws IOException{
        List<UserRatingDto> userRatingDtos = uploadRatings(file);

        userRatingDtos.parallelStream().forEach(bookRating->{
            UserEntity user = userRepository.findByUserId(bookRating.getUserId());
            bookRepository.findByISBN(bookRating.getBookISBN()).ifPresent(book -> {
                BookRating bookRating1 = new BookRating();
                bookRating1.setRating(bookRating.getBookRating());
                bookRating1.setUser(user);
                bookRating1.setBook(book);
                book.getRatings().add(bookRating1);
                user.getRatings().add(bookRating1);
                bookRatingRepository.save(bookRating1);
            });

        });
}

这就是我现在所拥有的，有什么我可以改变以使其更快吗？

自从 Spring Security 更新后，我必须对代码进行一些更改。这是我现在的配置类。

public class SecurityConfig {

    private final UserDetailsServiceImpl userDetailsService;
    private final UserRepository userRepository;


    public SecurityConfig(UserDetailsServiceImpl userDetailsService, UserRepository userRepository) {
        this.userDetailsService = userDetailsService;
        this.userRepository = userRepository;
    }

    @Bean
    public AuthenticationManager authenticationManager(AuthenticationConfiguration authenticationConfiguration) throws Exception {
        return authenticationConfiguration.getAuthenticationManager();
    }

    @Bean
    public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
        http.csrf().disable()
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
                .addFilter(new CustomAuthenticationFilter(authenticationManager()))
                .addFilter(new CustomAuthorizationFilter(authenticationManager(), userRepository))
                .authorizeRequests()
                .antMatchers(HttpMethod.POST, "/user/users/save").permitAll()
                .antMatchers(HttpMethod.POST, "/login").permitAll()
                .antMatchers(HttpMethod.POST, "/users//register").permitAll()
                .antMatchers("/**").permitAll() // Only for testing purposes
                .antMatchers("/user/**").hasAuthority("ADMIN")
                .antMatchers("/user/**").authenticated();
        return http.build();
    }


    @Bean
    public PasswordEncoder passwordEncoder() {
        return …