小编Ede*_*Sil的帖子

我有使用Spring Boot和thymeleaf的以下问题,我无法解决它.在错误发生后立即运行Application类时发生错误.

我与百里香的布局在于

主\资源\模板

HomeController的

@Controller
public class HomeController {

    @GetMapping("/")
    public String root() {
        return "page/home";
    }
}

应用

@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

POM

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <dependency>
            <groupId>nz.net.ultraq.thymeleaf</groupId>
            <artifactId>thymeleaf-layout-dialect</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>

LOG ERROR

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'viewResolver' defined in class path resource …

SELECT Count(1) AS total,
          'hello' AS filter,
          field1 AS field1,
          Count(DISTINCT field2) AS total_field2
   FROM table
   WHERE field = true
     AND status = 'ok'
      GROUP  BY field1

怀疑如何使用java8制作地图来存储以下结果。映射键必须是字段field1，映射值必须是total_field2字段。

也就是说，我需要使用字段 field1 和计数字段 field2 对列表进行分组

对于我的总字段

myList.stream().collect(Collectors.groupingBy(MyObject::getField1, Collectors.counting())) 
// this is just counting the records grouped by field1

我的结果是正确的total_field1：{4=55, 6=31}

对于 field2，我需要这样的东西，但它只是给我一个记录

myList.stream().filter(distinctByKey(MyObject::getField2))
.collect(Collectors.groupingBy(MyObject::getField1, Collectors.counting()));

public static <T> Predicate<T> distinctByKey(Function<? super T, ?> keyExtractor) {
        Set<Object> seen = ConcurrentHashMap.newKeySet();
        return t -> seen.add(keyExtractor.apply(t));
    }

结果total_Field2：{4=31}

应该返回 …