Spring开发踩坑记录

#1　　@EnableEurekaServer无法正常import原因是spring-cloud-dependencies版本太低，改成高版本的Edgware.SR4即可。参考：https://www.cnblogs.com/zhuwenjoyce/p/9655940.html

<!-- 使用dependencyManagement进行版本管理 -->
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Edgware.SR4</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

#2　　报错！ java.lang.NoSuchMethodError: org.springframework.boot.builder.SpringApplicationBuilder.<init>([Ljava/lang/Object;)　　参考：https://www.cnblogs.com/syp172654682/p/9015057.html

是由于spring boot版本兼容性导致的，在pom.xml中修改配置文件，修改前：

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.0.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

修改后：

<parent>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-parent</artifactId>
       <version>1.5.3.RELEASE</version>
       <relativePath/> <!-- lookup parent from repository -->
</parent>

#3　　报错！ Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.　　参考：https://blog.csdn.net/lance521/article/details/77847278　　和　　https://blog.csdn.net/xyjcfucdi128/article/details/86595936　　解决：需要在启动类的@SpringBootApplication中添加exclude = {DataSourceAutoConfiguration.class}

@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})

#4　　报错！ Parameter 3 of method eurekaRegistration in org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration required a　　参考：https://blog.csdn.net/u013276512/article/details/81088966

少了一个配置“'eureka.client.healthcheck.enabled'”，于是在项目的 application.yml文件中添加了eureka.client.healthcheck.enabled=true，如下：

eureka:
  client:
    healthcheck:
      enabled: true

#5　　报错！ Dependency 'org.csource:fastdfs-client-java:1.27-SNAPSHOT' not found　　参考：https://www.jianshu.com/p/c39ca1ee222b

从 https://github.com/happyfish100/fastdfs-client-java 下载

git clone https://github.com/happyfish100/fastdfs-client-java.git
# 进入下载好的fastdfs-client-java 解压
$ cd /fastdfs-client-java
# 使用maven打包jar
$ mvn clean install

构建完成后会自动把fastdfs-client-java-1.27-SNAPSHOT.jar安装到本地的Maven仓库

[INFO] Installing E:\cf\git\fastdfs-client-java-master\target\fastdfs-client-jav
a-1.27-SNAPSHOT.jar to D:\Development\MavenRepository\org\csource\fastdfs-client
-java\1.27-SNAPSHOT\fastdfs-client-java-1.27-SNAPSHOT.jar
[INFO] Installing E:\cf\git\fastdfs-client-java-master\pom.xml to D:\Development
\MavenRepository\org\csource\fastdfs-client-java\1.27-SNAPSHOT\fastdfs-client-ja
va-1.27-SNAPSHOT.pom
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  25.148 s
[INFO] Finished at: --15T10::+:
[INFO] ------------------------------------------------------------------------

#6　　报错！@SpringBootApplication used in default package　　参考：https://blog.csdn.net/weixin_42323802/article/details/84561492 和 https://blog.csdn.net/qq544649790/article/details/83032497　　在@springbootApplication 注解失效的情况下，推荐使用@CompentScan 和@EnableAutoConfiguration进行代替

修改前：

@EnableAutoConfiguration(exclude = {DataSourceAutoConfiguration.class})
@SpringBootApplication

修改后：

@EnableAutoConfiguration(exclude = {DataSourceAutoConfiguration.class})
@ComponentScan("com.dataplatform")
//@SpringBootApplication

#7　　java: 程序包org.csource.fastdfs不存在，事实上已经在本地编译安装了fastdfs-client-java　　参考：http://www.mamicode.com/info-detail-2329592.html 和 https://stackoverflow.com/questions/8150535/intellij-idea-indexed-maven-repositories-list-how-to-add-remote-maven-repos　　先自己编译源码成jar本地安装到maven的本地仓库，选中项目的主pom.xml文件，右键Maven -> Open 'settings.xml'，更新其中的信息为本地的库

#8　　IllegalArgumentException: java.net.UnknownHostException: quickstart.cloudera　　参考：https://blog.csdn.net/ganeshys2017/article/details/81360921 和 https://www.cnblogs.com/chenligeng/p/9347149.html　　在hosts文件中配置主机名quickstart.cloudera对应的IP地址

#9　　报错！repackage failed: Unable to find a single main class from the following candidates　　报错！idea maven 只编译 不运行

　　未能针对性解决，但是重启后问题消失了！

#10　　报错！NoSuchMethodError: org.springframework.core.annotation.AnnotationUtils.clearCache()V　　参考：https://blog.csdn.net/ghhgc/article/details/81213566 和 https://blog.csdn.net/qq_42664961/article/details/83860119　　解决方法：将spring-cloud-starter-openfeign的版本修改为和spring-cloud一致，如下所示

修改前：

            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</artifactId>
                <version>2.0.0.RC1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

修改后：

            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>