??不知道大家在日常的工作中，有没有遇到过有一些maven依赖始终不会自动下载，但是项目中又经常需要用到。面对这样的问题，怎么处理呢？说实在的，这个问题也困扰了我老半天，不过，最后还算是解决了。今天我们就给大家介绍一下。
??针对这种问题，我们就需要手动去下载了。
- eg:
<build><plugins><!-- GPG --><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-gpg-plugin</artifactId><version>1.6</version><executions><execution><phase>verify</phase><goals><goal>sign</goal></goals></execution></executions></plugin></plugins></build>
??针对上面这个例子，要手动下载，就需要执行如下的命令：
lwk@qwfys:~/Downloads$ mvn dependency:get -DremoteRepositories=http://repo1.maven.org/maven2/ -DgroupId=org.apache.maven.plugins -DartifactId=maven-gpg-plugin -Dversion=1.6
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.google.inject.internal.cglib.core.$ReflectUtils$1 (file:/usr/share/maven/lib/guice.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
WARNING: Please consider reporting this to the maintainers of com.google.inject.internal.cglib.core.$ReflectUtils$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[INFO] Scanning for projects...
Downloading from central: http://maven.aliyun.com/nexus/content/groups/public/org/apache/maven/plugins/maven-antrun-plugin/1.3/maven-antrun-plugin-1.3.pom
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Downloading from central: http://maven.aliyun.com/nexus/content/groups/public/org/apache/maven/plugins/maven-plugins/12/maven-plugins-12.pom
Downloaded from central: http://maven.aliyun.com/nexus/content/groups/public/org/apache/maven/plugins/maven-plugins/12/maven-plugins-12.pom (12 kB at 31 kB/s)
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Downloading from central: http://maven.aliyun.com/nexus/content/groups/public/org/apache/maven/plugins/maven-dependency-plugin/2.8/maven-dependency-plugin-2.8.pom
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[INFO]
[INFO] ------------------< org.apache.maven:standalone-pom >-------------------
[INFO] Building Maven Stub Project (No POM) 1
[INFO] --------------------------------[ pom ]---------------------------------
[INFO]
[INFO] --- maven-dependency-plugin:2.8:get (default-cli) @ standalone-pom ---
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[INFO] Resolving org.apache.maven.plugins:maven-gpg-plugin:jar:1.6 with transitive dependencies
Downloading from central: http://maven.aliyun.com/nexus/content/groups/public/org/apache/maven/plugins/maven-gpg-plugin/1.6/maven-gpg-plugin-1.6.pom
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[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 28.156 s
[INFO] Finished at: 2020-04-01T14:57:56+08:00
[INFO] ------------------------------------------------------------------------
lwk@qwfys:~/Downloads$ mvn dependency:get -DremoteRepositories=http://repo1.maven.org/maven2/ -DgroupId=org.apache.maven.plugins -DartifactId=maven-gpg-plugin -Dversion=1.5
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.google.inject.internal.cglib.core.$ReflectUtils$1 (file:/usr/share/maven/lib/guice.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
WARNING: Please consider reporting this to the maintainers of com.google.inject.internal.cglib.core.$ReflectUtils$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------< org.apache.maven:standalone-pom >-------------------
[INFO] Building Maven Stub Project (No POM) 1
[INFO] --------------------------------[ pom ]---------------------------------
[INFO]
[INFO] --- maven-dependency-plugin:2.8:get (default-cli) @ standalone-pom ---
[INFO] Resolving org.apache.maven.plugins:maven-gpg-plugin:jar:1.5 with transitive dependencies
Downloading from central: http://maven.aliyun.com/nexus/content/groups/public/org/apache/maven/plugins/maven-gpg-plugin/1.5/maven-gpg-plugin-1.5.pom
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[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.389 s
[INFO] Finished at: 2020-04-01T14:59:44+08:00
[INFO] ------------------------------------------------------------------------
lwk@qwfys:~/Downloads$