你该如何解决 idea中 Unable to reload Maven project 以及 maven安装配置(内附代码/有安装包)

简介: 你该如何解决 idea中 Unable to reload Maven project 以及 maven安装配置(内附代码/有安装包)

一、bug:Unasble to reload Maven project

我在学习Java后端框架ssm时经常会出现导入的依赖包一片片的爆红,就像下面这样,想想就气人,刚刚建个项目,还没开始写代码呢,在pom.xml下面导个包都给我报错,我在连续入坑两次(一次只下载配了maven环境变量,没有在idea中配置,还有一次maven版本不兼容)后,决定写一篇解决方案来帮助大家避坑。

可能大家在学习过程中,很多老师都不会说版本兼容问题,导致我们都是直接从官网下载的3.8.3版本,就会与idea2020版的不兼容,然后爆红之后都会按照老师说的在右上角点击maven刷新,结果就会弹出这个框框,提示你的maven版本不可用,maven版本与idea不兼容。

二、如何解决

版本不兼容的话,那肯定只有两个办法,一个是下载安装idea新版,一个安装老版本的maven


下面是maven与idea的兼容版本

三、maven3.6.3链接

这里给大家提供maven3.6.3的安装包,maven3.8.3在官网首页就有,这里就不给了


链接:https://pan.baidu.com/s/1Leai9n9iDPg3nZN21x5EUw
提取码:17hs

四、配置maven环境变量

  • 下载到指定的目录下面之后,右键此电脑–>属性–>高级系统设置–>环境变量
  • 新建变量MAVEN_HOME = D:\program\maven\apache-maven-3.6.3-bin\apache-maven-3.6.3(以自己的安装路径为准)

变量值是自己maven的下载路径

  • 编辑变量Path,添加变量值%MAVEN_HOME%\bin

  • 最后win+R运行cmd,输入mvn -version,如图所示则配置成功

五、配置本地仓库

  1. 在下载路径下新建maven-repository文件夹,用作maven的本地库
  2. 在路径D:\program\maven\apache-maven-3.6.3-bin\apache-maven-3.6.3\conf下找到settings.xml文件
  3. 打开settings.xml文件,找到节点localRepository,在注释外添加
<localRepository>D:\program\maven\apache-maven-3.6.3-bin\maven-repository</localRepository>

localRepository节点用于配置本地仓库,本地仓库其实起到了一个缓存的作用,它的默认地址是 C:\Users\用户名.m2。


当我们从maven中获取jar包的时候,maven首先会在本地仓库中查找,如果本地仓库有则返回;如果没有则从远程仓库中获取包,并在本地库中保存。


此外,我们在maven项目中运行mvn install,项目将会自动打包并安装到本地仓库中。

六、配置镜像

  1. 在settings.xml配置文件中找到mirrors节点
  2. 添加如下配置(注意要添加在和两个标签之间,其它配置同理)
<!-- 阿里云仓库 -->
<mirror>
  <id>alimaven</id>
  <mirrorOf>central</mirrorOf>
  <name>aliyun maven</name>
  <url>http://maven.aliyun.com/nexus/content/repositories/central/</url>
</mirror>

因为国外的服务器下载jar包很慢所以我们改为阿里云服务器

七、配置JDK

  1. 在settings.xml配置文件中找到profiles节点
  2. 添加如下配置
<!-- java版本 --> 
<profile>
    <id>jdk-1.8</id>
    <activation>
    <activeByDefault>true</activeByDefault>
    <jdk>1.8</jdk>
    </activation>
    <properties>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>
    </properties>
</profile>

配置完成,win+R运行cmd,输入mvn help:system测试,配置成功则本地仓库(D:\program\maven\apache-maven-3.6.3-bin\maven-repository)中会出现很多文件

首次执行 mvn help:system 命令,Maven相关工具自动帮我们到Maven中央仓库下载缺省的或者Maven中央仓库更新的各种配置文件和类库(jar包)到Maven本地仓库中。

下载完各种文件后, mvn help:system 命令会打印出所有的Java系统属性和环境变量

八、完整配置文件

<?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.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: ${user.home}/.m2/repository
  <localRepository>/path/to/local/repo</localRepository>
  -->
<localRepository>D:\program\maven\apache-maven-3.6.3-bin\maven-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>
     -->
   <!-- 阿里云仓库 -->
<mirror>
  <id>alimaven</id>
  <mirrorOf>central</mirrorOf>
  <name>aliyun maven</name>
  <url>http://maven.aliyun.com/nexus/content/repositories/central/</url>
</mirror>
  </mirrors>
  <!-- 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>
  <!-- java版本 --> 
  <profile>
      <id>jdk-1.8</id>
      <activation>
      <activeByDefault>true</activeByDefault>
      <jdk>1.8</jdk>
      </activation>
      <properties>
      <maven.compiler.source>1.8</maven.compiler.source>
      <maven.compiler.target>1.8</maven.compiler.target>
      <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>
      </properties>
  </profile>
    <!-- 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>

大家可以直接复制到自己的settings.xml文件中去,但是注意在把本地仓库那里需要改一下自己的路径

相关文章
|
Java 应用服务中间件 Maven
在IntelliJ IDEA中如何配置使用Maven以创建Tomcat环境
所以,别担心这些工具看起来有些吓人,实际上这些都是为了帮助你更好的完成工作的工具,就像超市里的各种烹饪工具一样,尽管它们看起来可能很复杂,但只要你学会用,它们会为你烹饪出一道道美妙的食物。这就是学习新技能的乐趣,让我们一起享受这个过程,攀登知识的高峰!
810 27
|
Java Maven
解决idea每次新建maven项目都需要重新配置maven的问题
解决idea每次新建maven项目都需要重新配置maven的问题
887 2
|
Java 应用服务中间件 Apache
在IntelliJ IDEA中使用Maven配置Tomcat环境
此配置方法具有较高的实用性,简单易懂。遵循以上步骤,您将能顺利在IntelliJ IDEA中使用Maven配置Tomcat环境,从而进行Web项目的开发和调试。
1677 18
|
Java Maven Kotlin
idea maven创建kotlin项目
本文介绍了在IntelliJ IDEA中使用Maven创建Kotlin项目的步骤,包括在`pom.xml`文件中添加Maven中央仓库、配置`kotlin-maven-plugin`插件、指定源目录、添加测试插件和执行插件,以及添加Kotlin测试依赖和标准库依赖。文中还提到了如何通过更换镜像或使用代理来解决依赖下载速度慢的问题,并展示了运行示例代码的截图。
994 4
idea maven创建kotlin项目
|
XML Java Maven
idea配置maven步骤及常见问题
本文介绍了在IDEA中配置Maven的详细步骤,包括Maven的下载、系统环境变量的配置、Maven本地仓库的设置、镜像加速的配置,以及在IDEA中指定Maven路径和配置文件。同时,还提供了解决每次新建项目需要重新手动配置Maven问题的方法。
idea配置maven步骤及常见问题
|
Java Maven Android开发
【Azure Developer】VS Code打包Java maven Project 遇见 BUILD FAILURE
Unknown lifecycle phase "lean". You must specify a valid lifecycle phase or a goal in the format <plugin-prefix>:<goal> or <plugin-group-id>:<plugin-artifact-id>[:<plugin-version>]:<goal>
704 5
|
Java Maven 容器
Maven使用IDEA自带工具打包,同时将lib下的jar包打入,双击jar包可直接运行
使用IntelliJ IDEA的Artifacts功能,可以将项目依赖的第三方jar包打包进jar文件中,实现双击jar包即可直接运行。
Maven使用IDEA自带工具打包,同时将lib下的jar包打入,双击jar包可直接运行
|
缓存 IDE Java
idea的maven项目打包时没有source下的文件
【10月更文挑战第21天】idea的maven项目打包时没有source下的文件
1277 1
|
前端开发 Java Maven
【前端学java】全网最详细的maven安装与IDEA集成教程!
【8月更文挑战第12天】全网最详细的maven安装与IDEA集成教程!
856 2
【前端学java】全网最详细的maven安装与IDEA集成教程!
|
Java 应用服务中间件 Maven
【终极解决方案】IDEA maven 项目修改代码不生效。
【终极解决方案】IDEA maven 项目修改代码不生效。
2574 1

推荐镜像

更多