導入maven項目各個註解均報錯的解決方案

導入maven項目各個註解均報錯

所遇問題

導入maven項目各個註解均報錯瞭

思考1:

這個項目使用瞭springboot;spring是個”大容器”,所有對象的創建和管理都交給瞭它, (SpringBoot是一個框架,一種全新的編程規范,他的產生簡化瞭框架的使用,所謂簡化是指簡化瞭Spring眾多框架中所需的大量且繁瑣的配置文件,所以 SpringBoot是一個服務於框架的框架,服務范圍是簡化配置文件。

最明顯的特點是,讓文件配置變的相當簡單、讓應用部署變的簡單(SpringBoot內置服務器,並裝備啟動類代碼),可以快速開啟一個Web容器進行開發。);先去查看springboot是否掃描到這些文件;

結果:查看配置文件XML以及各層的依賴,應該沒出錯。

思考2:

該導入的包是否成功導入?查看maven依賴樹(mvn dependency),並檢查依賴版本等是否有用;結果:應該沒錯,依賴樹上顯示瞭加入的jar包。

思考3:

有事問度娘;百度上的方法各異;我並沒有成功,也許是我操作或者對它們的理解出瞭問題吧;決定問大佬,我問瞭大佬,大佬從事安卓開發多年,所以幫我叫來另一個大佬;在另一個大佬的指點下,

解決方案

我先是去瞭本地倉庫setting.xml下的鏡像改為aliyun的鏡像;(下圖是查找你當前maven項目的本地倉庫已經配置文件setting.xml的方法)

我這個是默認生成的,如果沒有配置文件setting.xml;就自己新建一個;新建方法很多這裡就不介紹瞭;附上我的setting.xml

<?xml version="1.0" encoding="UTF-8"?>
 
<!--
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.
-->
 
<!--
 | This is the configuration file for Maven. It can be specified at two levels:
 |
 |  1. User Level. This settings.xml file provides configuration for a single
 |                 user, and is normally provided in
 |                 ${user.home}/.m2/settings.xml.
 |
 |                 NOTE: This location can be overridden with the CLI option:
 |
 |                 -s /path/to/user/settings.xml
 |
 |  2. Global Level. This settings.xml file provides configuration for all
 |                 Maven users on a machine (assuming they're all using the
 |                 same Maven installation). It's normally provided in
 |                 ${maven.home}/conf/settings.xml.
 |
 |                 NOTE: This location can be overridden with the CLI option:
 |
 |                 -gs /path/to/global/settings.xml
 |
 | The sections in this sample file are intended to give you a running start
 | at getting the most out of your Maven installation. Where appropriate, the
 | default values (values used when the setting is not specified) are provided.
 |
 |-->
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">
 
  <!-- localRepository
   | The path to the local repository maven will use to store artifacts.
   |
   | Default: ~/.m2/repository
  <localRepository>/path/to/local/repo</localRepository>
  -->
  
  <!--<localRepository>C:/Users/Administrator/.m2/repository</localRepository>  -->
  
  <localRepository>F:/eclipse_workspace20170314/repository</localRepository>
 
  <!-- interactiveMode
   | This will determine whether maven prompts you when it needs input. If set
   | to false, maven will use a sensible default value, perhaps based on some
   | other setting, for the parameter in question.
   |
   | Default: true
  <interactiveMode>true</interactiveMode>
  -->
 
  <!-- offline
   | Determines whether maven should attempt to connect to the network when
   | executing a build. This will have an effect on artifact downloads,
   | artifact deployment, and others.
   |
   | Default: false
  <offline>false</offline>
  -->
 
  <!-- pluginGroups
   | This is a list of additional group identifiers that will be searched when
   | resolving plugins by their prefix, i.e. when invoking a command line like
   | "mvn prefix:goal". Maven will automatically add the group identifiers
   | "org.apache.maven.plugins" and "org.codehaus.mojo" if these are not
   | already contained in the list.
   |-->
  <pluginGroups>
    <!-- pluginGroup
     | Specifies a further group identifier to use for plugin lookup.
    <pluginGroup>com.your.plugins</pluginGroup>
    -->
  </pluginGroups>
 
  <!-- proxies
   | This is a list of proxies which can be used on this machine to connect to
   | the network. Unless otherwise specified (by system property or command-
   | line switch), the first proxy specification in this list marked as active
   | will be used.
   |-->
  <proxies>
    <!-- proxy
     | Specification for one proxy, to be used in connecting to the network.
     |
    <proxy>
      <id>optional</id>
      <active>true</active>
      <protocol>http</protocol>
      <username>proxyuser</username>
      <password>proxypass</password>
      <host>proxy.host.net</host>
      <port>80</port>
      <nonProxyHosts>local.net|some.host.com</nonProxyHosts>
    </proxy>
    -->
  </proxies>
 
  <!-- servers
   | This is a list of authentication profiles, keyed by the server-id used
   | within the system. Authentication profiles can be used whenever maven must
   | make a connection to a remote server.
   |-->
  <servers>
    <!-- server
     | Specifies the authentication information to use when connecting to a
     | particular server, identified by a unique name within the system
     | (referred to by the 'id' attribute below).
     |
     | NOTE: You should either specify username/password OR
     |       privateKey/passphrase, since these pairings are used together.
     |
    <server>
      <id>deploymentRepo</id>
      <username>repouser</username>
      <password>repopwd</password>
    </server>
    -->
 
    <!-- Another sample, using keys to authenticate.
    <server>
      <id>siteServer</id>
      <privateKey>/path/to/private/key</privateKey>
      <passphrase>optional; leave empty if not used.</passphrase>
    </server>
    -->
  </servers>
 
  <!-- mirrors
   | This is a list of mirrors to be used in downloading artifacts from remote
   | repositories.
   |
   | It works like this: a POM may declare a repository to use in resolving
   | certain artifacts. However, this repository may have problems with heavy
   | traffic at times, so people have mirrored it to several places.
   |
   | That repository definition will have a unique id, so we can create a
   | mirror reference for that repository, to be used as an alternate download
   | site. The mirror site will be the preferred server for that repository.
   |-->
  <mirrors>
    <!-- mirror
     | Specifies a repository mirror site to use instead of a given repository.
     | The repository that this mirror serves has an ID that matches the
     | mirrorOf element of this mirror. IDs are used for inheritance and direct
     | lookup purposes, and must be unique across the set of mirrors.
     |
    <mirror>
      <id>mirrorId</id>
      <mirrorOf>repositoryId</mirrorOf>
      <name>Human Readable Name for this Mirror.</name>
      <url>http://my.repository.com/repo/path</url>
    </mirror>
     -->
 
    <mirror>
        <id>nexus-aliyun</id>
        <mirrorOf>*</mirrorOf>
        <name>Nexus aliyun</name>
        <url>http://maven.aliyun.com/nexus/content/groups/public</url>
    </mirror>
 
  <!-- profiles
   | This is a list of profiles which can be activated in a variety of ways,
   | and which can modify the build process. Profiles provided in the
   | settings.xml are intended to provide local machine-specific paths and
   | repository locations which allow the build to work in the local
   | environment.
   |
   | For example, if you have an integration testing plugin - like cactus -
   | that needs to know where your Tomcat instance is installed, you can
   | provide a variable here such that the variable is dereferenced during the
   | build process to configure the cactus plugin.
   |
   | As noted above, profiles can be activated in a variety of ways. One
   | way - the activeProfiles section of this document (settings.xml) - will be
   | discussed later. Another way essentially relies on the detection of a
   | system property, either matching a particular value for the property, or
   | merely testing its existence. Profiles can also be activated by JDK
   | version prefix, where a value of '1.4' might activate a profile when the
   | build is executed on a JDK version of '1.4.2_07'. Finally, the list of
   | active profiles can be specified directly from the command line.
   |
   | NOTE: For profiles defined in the settings.xml, you are restricted to
   |       specifying only artifact repositories, plugin repositories, and
   |       free-form properties to be used as configuration variables for
   |       plugins in the POM.
   |
   |-->
 
  <profiles>
    <!-- profile
     | Specifies a set of introductions to the build process, to be activated
     | using one or more of the mechanisms described above. For inheritance
     | purposes, and to activate profiles via <activatedProfiles/> or the
     | command line, profiles have to have an ID that is unique.
     |
     | An encouraged best practice for profile identification is to use a
     | consistent naming convention for profiles, such as 'env-dev',
     | 'env-test', 'env-production', 'user-jdcasey', 'user-brett', etc. This
     | will make it more intuitive to understand what the set of introduced
     | profiles is attempting to accomplish, particularly when you only have a
     | list of profile id's for debug.
     |
     | This profile example uses the JDK version to trigger activation, and
     | provides a JDK-specific repo.
    <profile>
      <id>jdk-1.4</id>
      <activation>
        <jdk>1.4</jdk>
      </activation>
      <repositories>
        <repository>
          <id>jdk14</id>
          <name>Repository for JDK 1.4 builds</name>
          <url>http://www.myhost.com/maven/jdk14</url>
          <layout>default</layout>
          <snapshotPolicy>always</snapshotPolicy>
        </repository>
      </repositories>
    </profile>
    -->
 
    <!--
     | Here is another profile, activated by the system property 'target-env'
     | with a value of 'dev', which provides a specific path to the Tomcat
     | instance. To use this, your plugin configuration might hypothetically
     | look like:
     |
     | ...
     | <plugin>
     |   <groupId>org.myco.myplugins</groupId>
     |   <artifactId>myplugin</artifactId>
     |
     |   <configuration>
     |     <tomcatLocation>${tomcatPath}</tomcatLocation>
     |   </configuration>
     | </plugin>
     | ...
     |
     | NOTE: If you just wanted to inject this configuration whenever someone
     |       set 'target-env' to anything, you could just leave off the
     |       <value/> inside the activation-property.
     |
    <profile>
      <id>env-dev</id>
      <activation>
        <property>
          <name>target-env</name>
          <value>dev</value>
        </property>
      </activation>
      <properties>
        <tomcatPath>/path/to/tomcat/instance</tomcatPath>
      </properties>
    </profile>
    -->
  </profiles>
 
  <!-- activeProfiles
   | List of profiles that are active for all builds.
   |
  <activeProfiles>
    <activeProfile>alwaysActiveProfile</activeProfile>
    <activeProfile>anotherAlwaysActiveProfile</activeProfile>
  </activeProfiles>
  -->
</settings>

如何修改成aliyun鏡像:

然後去本地倉庫把.lastUpdated為後綴的文件刪除瞭;再重新下載依賴;也就那些jar包,解決瞭嗎?並沒有,再試一次?去本地倉庫把.lastUpdated為後綴的文件刪除瞭,重新導入maven項目;不成啊。最後,我把本地倉庫裡的jar全刪除瞭,再重新導入項目,重新下載依賴,就成功瞭。

原因:本地倉庫裡存有上一個項目所留下jar包,jar版本不同起瞭沖突,所以有一些jar無法使用,或者是導入項目後加載依賴時出現瞭jar包破損。(懇請糾正我,我也是百度並自己理解的出來的原因)

如果查看錯誤,出現不能被讀或者它某jar也許是個zip文件這類錯誤,就是jdk版本太低,去更換一下項目的jdk環境,選擇項目屬性進行查看並更改

新導入maven項目註解爆紅,所有依賴包無法導入

剛開始做maven項目時,導入網上的一個開源spring boot項目結果整體崩掉,所有註解全部報錯,進行下載依賴無法下載,idea中點擊無反應,搜瞭一下午的bug也未徹底解決:

在這裡插入圖片描述

經過反復測試終於發現原因所在!!!

是因為本人電腦系統所致,在配置maven環境變量是無法讀取引用路徑符號%,導致maven沒徹底配置成功,即使cmd輸入 mvn -v顯示沒問題

解決步驟如下

在系統變量配置中配置path變量時使用maven安裝的bin目錄絕對路徑即可!!!

在這裡插入圖片描述

在這裡插入圖片描述

此bug可能僅是部分小夥伴的系統會出現,一定記住謹防采坑!!!

以上為個人經驗,希望能給大傢一個參考,也希望大傢多多支持WalkonNet

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