小编con*_*ter的帖子

这是我用来启动芹菜的代码：

from celery import Celery
from foo.lib.config import app
from foo.mods.bar.tract import Tesser
from foo.mods.baz.commons import clean_data, quotify


celery_app = Celery(app.name, broker=app.config["CELERY_BROKER_URL"])
celery_app.conf.update(app.config)
celery_app.autodiscover_tasks()


@celery_app.task
def tract_task(content):
    return Tesser.tesseract(content)


@celery_app.task
def clean_data_task(content):
    return clean_data(content)


@celery_app.task
def quotify_task(content):
    return quotify(content)

我使用以下命令启动工作程序：

celery worker -A celery_tasks.celery_app -l=info

这以前可以完美运行，但是当我将 celery 升级到 4.2.0 时，出现以下错误：

Traceback (most recent call last):
  File "/home/minister/.local/bin/celery", line 11, in <module>
    sys.exit(main())
  File "/home/minister/.local/lib/python3.5/site-packages/celery/__main__.py", line 16, in main
    _main()
  File "/home/minister/.local/lib/python3.5/site-packages/celery/bin/celery.py", line 322, in main
    cmd.execute_from_commandline(argv)
  File "/home/minister/.local/lib/python3.5/site-packages/celery/bin/celery.py", line 496, …

我有一个Spring Boot应用程序，尝试使用Postgres，但是每次都无法启动应用程序。这是堆栈跟踪：

"C:\Program Files\Java\jdk1.8.0_141\bin\java.exe" "-javaagent:D:\Programs\IntelliJ IDEA Community Edition 2018.2.1\lib\idea_rt.jar=55780:D:\Programs\IntelliJ IDEA Community Edition 2018.2.1\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_141\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_141\jre\lib\rt.jar;D:\main\gdrive\core\fooapp\api-module\target\classes;D:\main\gdrive\core\fooapp\commons-module\target\classes;C:\Users\andromeda\.m2\repository\javax\validation\validation-api\2.0.1.Final\validation-api-2.0.1.Final.jar;C:\Users\andromeda\.m2\repository\org\postgresql\postgresql\42.2.1\postgresql-42.2.1.jar;C:\Users\andromeda\.m2\repository\org\springframework\boot\spring-boot-starter-data-jpa\2.0.0.RELEASE\spring-boot-starter-data-jpa-2.0.0.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\boot\spring-boot-starter-aop\2.0.0.RELEASE\spring-boot-starter-aop-2.0.0.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\aspectj\aspectjweaver\1.8.13\aspectjweaver-1.8.13.jar;C:\Users\andromeda\.m2\repository\org\springframework\boot\spring-boot-starter-jdbc\2.0.0.RELEASE\spring-boot-starter-jdbc-2.0.0.RELEASE.jar;C:\Users\andromeda\.m2\repository\com\zaxxer\HikariCP\2.7.8\HikariCP-2.7.8.jar;C:\Users\andromeda\.m2\repository\org\springframework\spring-jdbc\5.0.4.RELEASE\spring-jdbc-5.0.4.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\hibernate\hibernate-core\5.2.14.Final\hibernate-core-5.2.14.Final.jar;C:\Users\andromeda\.m2\repository\org\hibernate\javax\persistence\hibernate-jpa-2.1-api\1.0.0.Final\hibernate-jpa-2.1-api-1.0.0.Final.jar;C:\Users\andromeda\.m2\repository\org\javassist\javassist\3.22.0-GA\javassist-3.22.0-GA.jar;C:\Users\andromeda\.m2\repository\antlr\antlr\2.7.7\antlr-2.7.7.jar;C:\Users\andromeda\.m2\repository\org\jboss\jandex\2.0.3.Final\jandex-2.0.3.Final.jar;C:\Users\andromeda\.m2\repository\dom4j\dom4j\1.6.1\dom4j-1.6.1.jar;C:\Users\andromeda\.m2\repository\org\hibernate\common\hibernate-commons-annotations\5.0.1.Final\hibernate-commons-annotations-5.0.1.Final.jar;C:\Users\andromeda\.m2\repository\javax\transaction\javax.transaction-api\1.2\javax.transaction-api-1.2.jar;C:\Users\andromeda\.m2\repository\org\springframework\data\spring-data-jpa\2.0.5.RELEASE\spring-data-jpa-2.0.5.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\data\spring-data-commons\2.0.5.RELEASE\spring-data-commons-2.0.5.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\spring-orm\5.0.4.RELEASE\spring-orm-5.0.4.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\spring-tx\5.0.4.RELEASE\spring-tx-5.0.4.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\spring-aspects\5.0.4.RELEASE\spring-aspects-5.0.4.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\boot\spring-boot-starter-mail\2.0.0.RELEASE\spring-boot-starter-mail-2.0.0.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\spring-context\5.0.4.RELEASE\spring-context-5.0.4.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\spring-context-support\5.0.4.RELEASE\spring-context-support-5.0.4.RELEASE.jar;C:\Users\andromeda\.m2\repository\com\sun\mail\javax.mail\1.6.1\javax.mail-1.6.1.jar;C:\Users\andromeda\.m2\repository\javax\activation\activation\1.1\activation-1.1.jar;C:\Users\andromeda\.m2\repository\org\springframework\boot\spring-boot-starter-freemarker\2.0.0.RELEASE\spring-boot-starter-freemarker-2.0.0.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\freemarker\freemarker\2.3.27-incubating\freemarker-2.3.27-incubating.jar;C:\Users\andromeda\.m2\repository\commons-validator\commons-validator\1.6\commons-validator-1.6.jar;C:\Users\andromeda\.m2\repository\commons-beanutils\commons-beanutils\1.9.2\commons-beanutils-1.9.2.jar;C:\Users\andromeda\.m2\repository\commons-digester\commons-digester\1.8.1\commons-digester-1.8.1.jar;C:\Users\andromeda\.m2\repository\commons-logging\commons-logging\1.2\commons-logging-1.2.jar;C:\Users\andromeda\.m2\repository\commons-collections\commons-collections\3.2.2\commons-collections-3.2.2.jar;C:\Users\andromeda\.m2\repository\org\springframework\boot\spring-boot-starter-amqp\2.0.0.RELEASE\spring-boot-starter-amqp-2.0.0.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\spring-messaging\5.0.4.RELEASE\spring-messaging-5.0.4.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\amqp\spring-rabbit\2.0.2.RELEASE\spring-rabbit-2.0.2.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\amqp\spring-amqp\2.0.2.RELEASE\spring-amqp-2.0.2.RELEASE.jar;C:\Users\andromeda\.m2\repository\com\rabbitmq\amqp-client\5.1.2\amqp-client-5.1.2.jar;C:\Users\andromeda\.m2\repository\com\rabbitmq\http-client\1.3.1.RELEASE\http-client-1.3.1.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\apache\httpcomponents\httpclient\4.5.5\httpclient-4.5.5.jar;C:\Users\andromeda\.m2\repository\org\apache\httpcomponents\httpcore\4.4.9\httpcore-4.4.9.jar;C:\Users\andromeda\.m2\repository\org\springframework\retry\spring-retry\1.2.2.RELEASE\spring-retry-1.2.2.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\boot\spring-boot-starter-data-redis\2.0.0.RELEASE\spring-boot-starter-data-redis-2.0.0.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\data\spring-data-redis\2.0.5.RELEASE\spring-data-redis-2.0.5.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\data\spring-data-keyvalue\2.0.5.RELEASE\spring-data-keyvalue-2.0.5.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\spring-oxm\5.0.4.RELEASE\spring-oxm-5.0.4.RELEASE.jar;C:\Users\andromeda\.m2\repository\redis\clients\jedis\2.9.0\jedis-2.9.0.jar;C:\Users\andromeda\.m2\repository\org\apache\commons\commons-pool2\2.5.0\commons-pool2-2.5.0.jar;C:\Users\andromeda\.m2\repository\org\springframework\boot\spring-boot-starter-web\2.0.0.RELEASE\spring-boot-starter-web-2.0.0.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\boot\spring-boot-starter-json\2.0.0.RELEASE\spring-boot-starter-json-2.0.0.RELEASE.jar;C:\Users\andromeda\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.9.4\jackson-datatype-jdk8-2.9.4.jar;C:\Users\andromeda\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.9.4\jackson-datatype-jsr310-2.9.4.jar;C:\Users\andromeda\.m2\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.9.4\jackson-module-parameter-names-2.9.4.jar;C:\Users\andromeda\.m2\repository\org\springframework\boot\spring-boot-starter-tomcat\2.0.0.RELEASE\spring-boot-starter-tomcat-2.0.0.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\apache\tomcat\embed\tomcat-embed-core\8.5.28\tomcat-embed-core-8.5.28.jar;C:\Users\andromeda\.m2\repository\org\apache\tomcat\embed\tomcat-embed-el\8.5.28\tomcat-embed-el-8.5.28.jar;C:\Users\andromeda\.m2\repository\org\apache\tomcat\embed\tomcat-embed-websocket\8.5.28\tomcat-embed-websocket-8.5.28.jar;C:\Users\andromeda\.m2\repository\org\hibernate\validator\hibernate-validator\6.0.7.Final\hibernate-validator-6.0.7.Final.jar;C:\Users\andromeda\.m2\repository\org\jboss\logging\jboss-logging\3.3.2.Final\jboss-logging-3.3.2.Final.jar;C:\Users\andromeda\.m2\repository\org\springframework\spring-web\5.0.4.RELEASE\spring-web-5.0.4.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\spring-beans\5.0.4.RELEASE\spring-beans-5.0.4.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\spring-webmvc\5.0.4.RELEASE\spring-webmvc-5.0.4.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\spring-expression\5.0.4.RELEASE\spring-expression-5.0.4.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\boot\spring-boot-starter-security\2.0.0.RELEASE\spring-boot-starter-security-2.0.0.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\spring-aop\5.0.4.RELEASE\spring-aop-5.0.4.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\security\spring-security-config\5.0.3.RELEASE\spring-security-config-5.0.3.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\security\spring-security-web\5.0.3.RELEASE\spring-security-web-5.0.3.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\security\spring-security-core\5.0.3.RELEASE\spring-security-core-5.0.3.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\spring-core\5.0.4.RELEASE\spring-core-5.0.4.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\spring-jcl\5.0.4.RELEASE\spring-jcl-5.0.4.RELEASE.jar;C:\Users\andromeda\.m2\repository\net\bytebuddy\byte-buddy\1.7.10\byte-buddy-1.7.10.jar;C:\Users\andromeda\.m2\repository\com\fasterxml\jackson\dataformat\jackson-dataformat-yaml\2.9.4\jackson-dataformat-yaml-2.9.4.jar;C:\Users\andromeda\.m2\repository\org\yaml\snakeyaml\1.19\snakeyaml-1.19.jar;C:\Users\andromeda\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.9.4\jackson-core-2.9.4.jar;C:\Users\andromeda\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.9.4\jackson-databind-2.9.4.jar;C:\Users\andromeda\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.9.0\jackson-annotations-2.9.0.jar;C:\Users\andromeda\.m2\repository\io\jsonwebtoken\jjwt\0.9.0\jjwt-0.9.0.jar;C:\Users\andromeda\.m2\repository\io\springfox\springfox-swagger2\2.7.0\springfox-swagger2-2.7.0.jar;C:\Users\andromeda\.m2\repository\io\swagger\swagger-annotations\1.5.13\swagger-annotations-1.5.13.jar;C:\Users\andromeda\.m2\repository\io\swagger\swagger-models\1.5.13\swagger-models-1.5.13.jar;C:\Users\andromeda\.m2\repository\io\springfox\springfox-spi\2.7.0\springfox-spi-2.7.0.jar;C:\Users\andromeda\.m2\repository\io\springfox\springfox-core\2.7.0\springfox-core-2.7.0.jar;C:\Users\andromeda\.m2\repository\io\springfox\springfox-schema\2.7.0\springfox-schema-2.7.0.jar;C:\Users\andromeda\.m2\repository\io\springfox\springfox-swagger-common\2.7.0\springfox-swagger-common-2.7.0.jar;C:\Users\andromeda\.m2\repository\io\springfox\springfox-spring-web\2.7.0\springfox-spring-web-2.7.0.jar;C:\Users\andromeda\.m2\repository\org\reflections\reflections\0.9.11\reflections-0.9.11.jar;C:\Users\andromeda\.m2\repository\com\google\guava\guava\18.0\guava-18.0.jar;C:\Users\andromeda\.m2\repository\com\fasterxml\classmate\1.3.4\classmate-1.3.4.jar;C:\Users\andromeda\.m2\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;C:\Users\andromeda\.m2\repository\org\springframework\plugin\spring-plugin-core\1.2.0.RELEASE\spring-plugin-core-1.2.0.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\plugin\spring-plugin-metadata\1.2.0.RELEASE\spring-plugin-metadata-1.2.0.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\mapstruct\mapstruct\1.1.0.Final\mapstruct-1.1.0.Final.jar;C:\Users\andromeda\.m2\repository\io\springfox\springfox-swagger-ui\2.7.0\springfox-swagger-ui-2.7.0.jar;C:\Users\andromeda\.m2\repository\com\chargebee\chargebee-java\2.6.0\chargebee-java-2.6.0.jar;C:\Users\andromeda\.m2\repository\org\json\json\20090211\json-20090211.jar;C:\Users\andromeda\.m2\repository\commons-codec\commons-codec\1.11\commons-codec-1.11.jar;C:\Users\andromeda\.m2\repository\org\springframework\boot\spring-boot-starter\2.0.0.RELEASE\spring-boot-starter-2.0.0.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\boot\spring-boot\2.0.0.RELEASE\spring-boot-2.0.0.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\2.0.0.RELEASE\spring-boot-autoconfigure-2.0.0.RELEASE.jar;C:\Users\andromeda\.m2\repository\org\springframework\boot\spring-boot-starter-logging\2.0.0.RELEASE\spring-boot-starter-logging-2.0.0.RELEASE.jar;C:\Users\andromeda\.m2\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;C:\Users\andromeda\.m2\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;C:\Users\andromeda\.m2\repository\org\apache\logging\log4j\log4j-to-slf4j\2.10.0\log4j-to-slf4j-2.10.0.jar;C:\Users\andromeda\.m2\repository\org\apache\logging\log4j\log4j-api\2.10.0\log4j-api-2.10.0.jar;C:\Users\andromeda\.m2\repository\org\slf4j\jul-to-slf4j\1.7.25\jul-to-slf4j-1.7.25.jar;C:\Users\andromeda\.m2\repository\javax\annotation\javax.annotation-api\1.3.2\javax.annotation-api-1.3.2.jar;C:\Users\andromeda\.m2\repository\commons-lang\commons-lang\2.6\commons-lang-2.6.jar" com.fooapp.api.ApiMain

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | …

我有一个位于类路径资源中的内部application.yml文件，其中包含以下字段：

redis:
  hostname: localhost
  port: 6379
  database: 0
  password:

有一个外部配置文件：config.properties。它定义了一些要在我的服务器上下文中覆盖的字段。文件config.properties：

redis.hostname = db.example.com
redis.password = my_password

应用程序无法启动，因为它无法读取配置文件中的 redis.port 属性。我的疑问是，如果 spring 已经找到了外部文件中定义的某些字段（在本例中为主机名、密码），则spring 不会完全保留属性源（redis ）的字段。

我正在使用以下命令运行该应用程序：

java -jar -Dspring.config.location=file:///home/username/config.properties application.jar

如何让spring正确覆盖内部配置文件，以便它只覆盖额外的属性（redis.hostname，redis.password），但仍然保留内部文件中定义的其他字段（如redis.port，redis.database）但是没有在外部文件中定义？

PS：我知道正在发生这种情况，因为当我在外部配置文件中添加redis.port=6379属性时，应用程序可以正常工作。

I am working on an application which needs to test 1000's of proxy servers continuously. The application is based around Spring Boot.

The current approach I am using is @Async decorated method which takes a proxy server and returns the result.

I am often getting OutOfMemory error and the processing is very slow. I assume that is because each async method is executed in a separate thread which blocks on I/O?

Everywhere I read about async in Java, people mix …

这是实体：

@Document
@Data
public class ApplicationUser {
    private String name;
    @Indexed(unique = true)
    private String email;
    private String organization = null;
    // other fields
}

我使用他们的电子邮件获取该用户，然后更改他们的姓名。我使用ApplicationUserRepository的自动装配实例。

ApplicationUser applicationUser = applicationUserRepository.findByEmail("abc@gmail.com");
applicationUser.setName("John Doe 2");

然后我尝试在数据库中再次更新这个实体：

applicationUserRepository.save(applicationUser);

我在现场电子邮件中收到重复的密钥错误。为什么会这样？据我从文档中获得，如果 ObjectId 相同，save方法会更新同一个文档。既然我没有更改 objectId 那么为什么它在保存期间尝试创建一个新的 ApplicationUser ？

这是我的application.yml文件：

spring:
  freemarker:
    template-loader-path: classpath:/templates

  datasource:
    url: jdbc:postgresql://localhost:5432/myapp
    username: postgres
    password: password
    driver-class-name: org.postgresql.Driver

  jpa:
    show-sql: true
    properties:
      hibernate:
        enable_lazy_load_no_trans: false
        jdbc:
          lob:
            non_contextual_creation: true
        dialect: org.hibernate.dialect.PostgreSQLDialect
    hibernate:
      ddl-auto: create-drop


---

spring:
  profiles:
    active: development


---

spring:
  profiles: staging

  jpa:
    show-sql: true
    hibernate:
      ddl-auto: update

logging:
  level:
    root: DEBUG

---

spring:
  profiles: production

  jpa:
    show-sql: false
    hibernate:
      ddl-auto: update

我使用以下命令运行该应用程序：

java -jar application.jar -Dspring.profiles.active=staging

在日志中，我可以看到spring boot打印出来： 下列配置文件处于活动状态：开发

那么，即使我在命令行args中显式设置了活动配置文件，为什么也不将其配置为暂存？

我正在尝试呈现完整高度的页面。但是它添加了滚动条，这是不希望的。高度为100％时，我的意思是屏幕的大小。

这是示范。黄色突出显示的部分是添加的多余高度。还有一个水平滚动条（未突出显示）：

这是页面的渲染方法：

return (
    <>
        <Box display='flex' flex='1' justifyContent='space-around'>
            <IndexSelector
                id='index'
                value={symbol}
                onChange={this.onSymbolChange}/>
            <SeriesSelector
                id='series'
                seriesList={Form.seriesList}
                onChange={this.onSeriesChange}/>
            <DateRange fromDate={fromDate} toDate={toDate} onChange={this.onDateChange}/>
        </Box>

        <Box height='100%' border='1px solid red' marginTop='50px'>
            <Graph instructions={this.getInstructions()} apiData={this.apiData} />
        </Box>
    </>
)

这是index.css：

html {
  box-sizing: border-box;
}

html, body, #root {
  padding: 0px !important;;
  margin: 0px !important;;
  height: 100vh;
  width: 100vw;
}

*, *:before, *:after {
  box-sizing: inherit;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen",
    "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica …

这是我的基类:

@Service
public class BasicUserManagerService implements UserManager {
    @Autowired
    private UserRepository UserRepository;

    private Logger logger = LoggerFactory.getLogger(UserManagerPasswordController.class);

    @Override
    public void createUser(User User) {
        if (UserRepository.findByEmail(User.getEmail()) != null)
            throw new InvalidDataException("User already registered with this email address");
        UserRepository.save(User);
        logger.info("Created user: {}", User.getEmail());
    }
}

我试图扩展这个类如下:

@Service
public class UserManagerService extends BasicUserManagerService implements UserManager {
    @Override
    public void createUser(User User) {
        super().createUser(User);
    }
}

但我一直得到的错误是对super()的调用必须是构造函数体中的第一个语句.正如你所看到的,我没有构造函数,即使我添加它,我也会得到同样的错误.为什么会发生这种情况,我该如何避免呢？

我正在尝试绘制时间序列，但我没有获得此图表左侧所示的股票工具。来自 highstocks 网站的示例：在此处输入链接描述

带选项的代码：

import React from 'react';
import Highcharts from 'highcharts/highstock'
import HighchartsReact from 'highcharts-react-official'


class Graph extends React.Component {
    getOptions = (dataSets) => {
        return {
            yAxis: [{
                labels: {
                    align: 'left'
                },
                height: '80%',
                resize: {
                    enabled: true
                }
            }, {
                labels: {
                    align: 'left'
                },
                top: '80%',
                height: '20%',
                offset: 0
            }],

            title: {
                text: 'Summary'
            },

            series: [{
                name: 'INFY',
                data: dataSets.data
            }]
        };
    };

    render() {
        const {dataSets} = this.props;
        const options = …