導(dǎo)入maven項目各個注解均報錯的解決方案
導(dǎo)入maven項目各個注解均報錯
所遇問題
導(dǎo)入maven項目各個注解均報錯了
思考1:
這個項目使用了springboot;spring是個”大容器”,所有對象的創(chuàng)建和管理都交給了它, (SpringBoot是一個框架,一種全新的編程規(guī)范,他的產(chǎn)生簡化了框架的使用,所謂簡化是指簡化了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(wù)于框架的框架,服務(wù)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(dāng)簡單、讓應(yīng)用部署變的簡單(SpringBoot內(nèi)置服務(wù)器,并裝備啟動類代碼),可以快速開啟一個Web容器進(jìn)行開發(fā)。);先去查看springboot是否掃描到這些文件;
結(jié)果:查看配置文件XML以及各層的依賴,應(yīng)該沒出錯。
思考2:
該導(dǎo)入的包是否成功導(dǎo)入?查看maven依賴樹(mvn dependency),并檢查依賴版本等是否有用;結(jié)果:應(yīng)該沒錯,依賴樹上顯示了加入的jar包。
思考3:
有事問度娘;百度上的方法各異;我并沒有成功,也許是我操作或者對它們的理解出了問題吧;決定問大佬,我問了大佬,大佬從事安卓開發(fā)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
我先是去了本地倉庫setting.xml下的鏡像改為aliyun的鏡像;(下圖是查找你當(dāng)前maven項目的本地倉庫已經(jīng)配置文件setting.xml的方法)
我這個是默認(rèn)生成的,如果沒有配置文件setting.xml;就自己新建一個;新建方法很多這里就不介紹了;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:
然后去本地倉庫把.lastUpdated為后綴的文件刪除了;再重新下載依賴;也就那些jar包,解決了嗎?并沒有,再試一次?去本地倉庫把.lastUpdated為后綴的文件刪除了,重新導(dǎo)入maven項目;不成啊。最后,我把本地倉庫里的jar全刪除了,再重新導(dǎo)入項目,重新下載依賴,就成功了。
原因:本地倉庫里存有上一個項目所留下jar包,jar版本不同起了沖突,所以有一些jar無法使用,或者是導(dǎo)入項目后加載依賴時出現(xiàn)了jar包破損。(懇請糾正我,我也是百度并自己理解的出來的原因)
如果查看錯誤,出現(xiàn)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(huán)境,選擇項目屬性進(jìn)行查看并更改
新導(dǎo)入maven項目注解爆紅,所有依賴包無法導(dǎo)入
剛開始做maven項目時,導(dǎo)入網(wǎng)上的一個開源spring boot項目結(jié)果整體崩掉,所有注解全部報錯,進(jìn)行下載依賴無法下載,idea中點擊無反應(yīng),搜了一下午的bug也未徹底解決:
經(jīng)過反復(fù)測試終于發(fā)現(xiàn)原因所在?。。?/h3>
是因為本人電腦系統(tǒng)所致,在配置maven環(huán)境變量是無法讀取引用路徑符號%,導(dǎo)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(tǒng)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?。?!
此bug可能僅是部分小伙伴的系統(tǒng)會出現(xiàn),一定記住謹(jǐn)防采坑!?。?/p>
以上為個人經(jīng)驗,希望能給大家一個參考,也希望大家多多支持腳本之家
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