Question

我在S3中有一个私有存储库，用于发布一个库，然后我在另一个项目中使用。

要发布，我有这个设置：

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.7.0</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
    </plugins>

    <extensions>
        <extension>
            <groupId>com.allogy.maven.wagon</groupId>
            <artifactId>maven-s3-wagon</artifactId>
            <version>1.1.0</version>
        </extension>
    </extensions>
</build>

<distributionManagement>
    <repository>
        <id>projectx-aws-release</id>
        <name>ProjectX AWS Release Repository</name>
        <url>s3://projectx-support/maven2</url>
    </repository>
    <snapshotRepository>
        <id>projectx-aws-snapshots</id>
        <name>Projectx AWS Snapshot Repository</name>
        <url>s3://projectx-support/maven2</url>
    </snapshotRepository>
</distributionManagement>

然后，在使用该库的应用程序上：

<build>
    ...

    <extensions>
        <extension>
            <groupId>com.allogy.maven.wagon</groupId>
            <artifactId>maven-s3-wagon</artifactId>
            <version>1.1.0</version>
        </extension>
    </extensions>
</build>

<repositories>
    <repository>
        <id>projectX-aws</id>
        <url>s3://projectX-support/maven2</url>
        <releases><enabled>true</enabled></releases>
        <snapshots><enabled>true</enabled></snapshots>
    </repository>
</repositories>

.circleci/settings.xml拥有S3 repo的凭据：

<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">
    <servers>
        <server>
            <id>projectx-aws</id>
            <username>....</username>
            <password>....</password>
        </server>
    </servers>
</settings>

运行mvn --batch-mode --settings .circleci/settings.xml dependency:go-offline时会发生奇怪的事情。它会快速下载一些依赖项：

mvn --batch-mode --settings .circleci/settings.xml dependency:go-offline
[INFO] Scanning for projects...
Downloading: http://repo.maven.apache.org/maven2/com/allogy/maven/wagon/maven-s3-wagon/1.1.0/maven-s3-wagon-1.1.0.pom
Downloaded: http://repo.maven.apache.org/maven2/com/allogy/maven/wagon/maven-s3-wagon/1.1.0/maven-s3-wagon-1.1.0.pom (7 KB at 47.0 KB/sec)
Downloading: http://repo.maven.apache.org/maven2/com/allogy/allogy-maven-pom-oss/2.0/allogy-maven-pom-oss-2.0.pom
Downloaded: http://repo.maven.apache.org/maven2/com/allogy/allogy-maven-pom-oss/2.0/allogy-maven-pom-oss-2.0.pom (10 KB at 808.4 KB/sec)
Downloading: http://repo.maven.apache.org/maven2/com/google/guava/guava/15.0/guava-15.0.pom
Downloaded: http://repo.maven.apache.org/maven2/com/google/guava/guava/15.0/guava-15.0.pom (7 KB at 508.8 KB/sec)
.
.
.
Downloading: http://repo.maven.apache.org/maven2/org/apache/apache/16/apache-16.pom
Downloaded: http://repo.maven.apache.org/maven2/org/apache/apache/16/apache-16.pom (16 KB at 1879.5 KB/sec)
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-dependency-plugin/2.10/maven-dependency-plugin-2.10.jar
Downloaded: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-dependency-plugin/2.10/maven-dependency-plugin-2.10.jar (157 KB at 12014.5 KB/sec)

然后它显示了这个：

[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building projectx 1.0.0-beta.2
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] >>> maven-dependency-plugin:2.10:go-offline (default-cli) @ projectx >>>
[INFO] 
[INFO] --- maven-dependency-plugin:2.10:resolve-plugins (resolve-plugins) @ projectx ---

并下载更多deps：

Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/maven-artifact/2.2.1/maven-artifact-2.2.1.pom
Downloaded: http://repo.maven.apache.org/maven2/org/apache/maven/maven-artifact/2.2.1/maven-artifact-2.2.1.pom (2 KB at 171.5 KB/sec)
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/maven/2.2.1/maven-2.2.1.pom
Downloaded: http://repo.maven.apache.org/maven2/org/apache/maven/maven/2.2.1/maven-2.2.1.pom (22 KB at 2431.5 KB/sec)
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/maven-parent/11/maven-parent-11.pom
Downloaded: http://repo.maven.apache.org/maven2/org/apache/maven/maven-parent/11/maven-parent-11.pom (32 KB at 3516.6 KB/sec)
.
.
.
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-resources-plugin/2.6/maven-resources-plugin-2.6.jar
Downloaded: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-resources-plugin/2.6/maven-resources-plugin-2.6.jar (29 KB at 4118.2 KB/sec)
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-jar-plugin/2.2/maven-jar-plugin-2.2.jar
Downloaded: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-jar-plugin/2.2/maven-jar-plugin-2.2.jar (27 KB at 3252.7 KB/sec)
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-install-plugin/2.3/maven-install-plugin-2.3.jar
Downloaded: http://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-install-plugin/2.3/maven-install-plugin-2.3.jar (23 KB at 2775.0 KB/sec)

然后它尝试从S3存储库下载应该是Maven Central的jar：

[INFO] Plugin Resolved: copy-rename-maven-plugin-1.0.1.jar
Downloading: s3://projectx-support/maven2/com/coderplus/maven/plugins/copy-rename-maven-plugin/1.0.1/copy-rename-maven-plugin-1.0.1.pom
[INFO] File permissions: Private
[INFO] Logged in - projectx-support
[INFO] Downloading: s3://projectx-support/maven2/com/coderplus/maven/plugins/copy-rename-maven-plugin/1.0.1/copy-rename-maven-plugin-1.0.1.pom
[INFO] Logged off - projectx-support
[INFO] Transfers: 1 Time: 27ms Amount: 0 bytes Throughput: 0.000 bytes/s
Downloading: http://repo.maven.apache.org/maven2/com/coderplus/maven/plugins/copy-rename-maven-plugin/1.0.1/copy-rename-maven-plugin-1.0.1.pom
Downloaded: http://repo.maven.apache.org/maven2/com/coderplus/maven/plugins/copy-rename-maven-plugin/1.0.1/copy-rename-maven-plugin-1.0.1.pom (5 KB at 418.0 KB/sec)
Downloading: s3://projectx-support/maven2/org/sonatype/oss/oss-parent/9/oss-parent-9.pom
[INFO] File permissions: Private
[INFO] Logged in - projectx-support
[INFO] Downloading: s3://projectx-support/maven2/org/sonatype/oss/oss-parent/9/oss-parent-9.pom
[INFO] Logged off - projectx-support
[INFO] Transfers: 1 Time: 11ms Amount: 0 bytes Throughput: 0.000 bytes/s
Downloading: http://repo.maven.apache.org/maven2/org/sonatype/oss/oss-parent/9/oss-parent-9.pom
Downloaded: http://repo.maven.apache.org/maven2/org/sonatype/oss/oss-parent/9/oss-parent-9.pom (7 KB at 712.8 KB/sec)
Downloading: s3://projectx-support/maven2/org/apache/maven/maven-model/2.0.9/maven-model-2.0.9.jar
[INFO] File permissions: Private
[INFO] Logged in - projectx-support
[INFO] Downloading: s3://projectx-support/maven2/org/apache/maven/maven-model/2.0.9/maven-model-2.0.9.jar
[INFO] Logged off - projectx-support
[INFO] Transfers: 1 Time: 12ms Amount: 0 bytes Throughput: 0.000 bytes/s
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/maven-model/2.0.9/maven-model-2.0.9.jar
Downloaded: http://repo.maven.apache.org/maven2/org/apache/maven/maven-model/2.0.9/maven-model-2.0.9.jar (86 KB at 9475.0 KB/sec)
Downloading: s3://projectx-support/maven2/org/apache/maven/maven-project/2.0.9/maven-project-2.0.9.jar
[INFO] File permissions: Private
[INFO] Logged in - projectx-support
[INFO] Downloading: s3://projectx-support/maven2/org/apache/maven/maven-project/2.0.9/maven-project-2.0.9.jar
[INFO] Logged off - projectx-support
[INFO] Transfers: 1 Time: 12ms Amount: 0 bytes Throughput: 0.000 bytes/s
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/maven-project/2.0.9/maven-project-2.0.9.jar
Downloaded: http://repo.maven.apache.org/maven2/org/apache/maven/maven-project/2.0.9/maven-project-2.0.9.jar (119 KB at 11892.6 KB/sec)
Downloading: s3://projectx-support/maven2/org/apache/maven/maven-core/2.0.9/maven-core-2.0.9.jar

经过一段时间后，AWS开始抛出Connection refused错误（某些保护系统可能？）并且不会下载仅存在于S3 repo中的依赖关系：

Downloading: s3://projectx-support/maven2/tech/projectx/projectxcommon/1.0.0-SNAPSHOT/maven-metadata.xml
[WARN] s3://projectx-support/maven2 - Connection refused
[INFO] Logged off - projectx-support
[WARNING] Could not transfer metadata tech.projectx:projectxcommon:1.0.0-SNAPSHOT/maven-metadata.xml from/to projectx-aws (s3://projectx-support/maven2): Could not connect to repository
[WARNING] Failure to transfer tech.projectx:projectxcommon:1.0.0-SNAPSHOT/maven-metadata.xml from s3://projectx-support/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of projectx-aws has elapsed or updates are forced. Original error: Could not transfer metadata tech.projectx:projectxcommon:1.0.0-SNAPSHOT/maven-metadata.xml from/to projectx-aws (s3://projectx-support/maven2): Could not connect to repository
Downloading: s3://projectx-support/maven2/tech/projectx/projectxcommon/1.0.0-SNAPSHOT/projectxcommon-1.0.0-SNAPSHOT.pom
[WARN] s3://projectx-support/maven2 - Connection refused
[INFO] Logged off - projectx-support

导致编译失败：

[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 17.929s
[INFO] Finished at: Wed Apr 18 16:03:19 UTC 2018
[INFO] Final Memory: 32M/1067M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project projectx: Could not resolve dependencies for project tech.projectx:projectx:jar:1.0.0-beta.2: Failed to collect dependencies for [tech.projectx:projectxcommon:jar:1.0.0-SNAPSHOT (compile), org.projectlombok:lombok:jar:1.16.20 (compile), org.springframework:spring-web:jar:5.0.5.RELEASE (compile), org.springframework.retry:spring-retry:jar:1.2.2.RELEASE (compile), com.fasterxml.jackson.core:jackson-databind:jar:2.9.5 (compile), org.kordamp.ikonli:ikonli-javafx:jar:2.1.1 (compile), org.kordamp.ikonli:ikonli-fontawesome5-pack:jar:2.1.1 (compile), net.harawata:appdirs:jar:1.0.1 (compile), io.sentry:sentry:jar:1.7.3 (compile), org.javassist:javassist:jar:3.22.0-CR2 (compile), junit:junit:jar:4.12 (test)]: Failed to read artifact descriptor for tech.projectx:projectxcommon:jar:1.0.0-SNAPSHOT: Could not transfer artifact tech.projectx:projectxcommon:pom:1.0.0-SNAPSHOT from/to projectx-aws (s3://projectx-support/maven2): Could not connect to repository: Couldn't initialize a SAX driver to create an XMLReader: SAX2 driver class org.apache.xerces.parsers.SAXParser not found -> [Help 1]

任何想法发生了什么？这似乎是不确定的。它来自于不会对其产生任何影响的变化，尽管它似乎非常一致，因为重建似乎并没有改变结果。我确信凭证有效，因为它们用于两个项目，一个正在工作，它们与该项目工作时使用的相同。

自从我从Gradle切换到Maven以来，这种情况一直在发生，但由于这是一个完全不同的系统，我认为这不是一个非常有用的比较。

当我在自己的计算机上运行mvn --batch-mode --settings .circleci/settings.xml dependency:go-offline install -e -X时，在删除〜/ .m2 / repository之后，输出如下所示：https://gist.github.com/pupeno/da4f53a6e9673ff611909021306191a4#file-maven-local-machine-log当我在CircleCI中执行相同操作时，它看起来像这样： https://gist.github.com/pupeno/da4f53a6e9673ff611909021306191a4#file-maven-circleci-log

列出存在的存储库时，按照How can I ask Maven for a list of the default repositories?的答案，我看到了：

<repositories>
    <repository>
        <id>projectx-aws</id>
        <url>s3://projectx-support/maven2</url>
        <layout>default</layout>
        <locations class="linked-hash-map">
            <entry>
                <string></string>
                <inputLocation>
                    <lineNumber>461</lineNumber>
                    <columnNumber>21</columnNumber>
                    <source>
                        <modelId>tech.projectx:projectx:1.0.0-beta.2</modelId>
                        <location>C:\Users\pupeno\Documents\projectx\code\projectx\pom.xml</location>
                    </source>
                </inputLocation>
            </entry>
            <entry>
                <string>id</string>
                <inputLocation>
                    <lineNumber>462</lineNumber>
                    <columnNumber>17</columnNumber>
                    <source reference="../../../entry/inputLocation/source"/>
                </inputLocation>
            </entry>
            <entry>
                <string>url</string>
                <inputLocation>
                    <lineNumber>463</lineNumber>
                    <columnNumber>18</columnNumber>
                    <source reference="../../../entry/inputLocation/source"/>
                </inputLocation>
            </entry>
        </locations>
        <releases>
            <enabled>true</enabled>
            <locations class="linked-hash-map">
                <entry>
                    <string></string>
                    <inputLocation>
                        <lineNumber>464</lineNumber>
                        <columnNumber>23</columnNumber>
                        <source reference="../../../../../locations/entry/inputLocation/source"/>
                    </inputLocation>
                </entry>
                <entry>
                    <string>enabled</string>
                    <inputLocation>
                        <lineNumber>465</lineNumber>
                        <columnNumber>26</columnNumber>
                        <source reference="../../../../../locations/entry/inputLocation/source"/>
                    </inputLocation>
                </entry>
            </locations>
        </releases>
        <snapshots>
            <enabled>true</enabled>
            <locations class="linked-hash-map">
                <entry>
                    <string></string>
                    <inputLocation>
                        <lineNumber>467</lineNumber>
                        <columnNumber>24</columnNumber>
                        <source reference="../../../../../locations/entry/inputLocation/source"/>
                    </inputLocation>
                </entry>
                <entry>
                    <string>enabled</string>
                    <inputLocation>
                        <lineNumber>468</lineNumber>
                        <columnNumber>26</columnNumber>
                        <source reference="../../../../../locations/entry/inputLocation/source"/>
                    </inputLocation>
                </entry>
            </locations>
        </snapshots>
    </repository>
    <repository>
        <id>central</id>
        <name>Central Repository</name>
        <url>https://repo.maven.apache.org/maven2</url>
        <layout>default</layout>
        <snapshots>
            <enabled>false</enabled>
        </snapshots>
    </repository>
</repositories>

s3://projectx-support/maven2/tech/projectx/projectxcommon/1.0.0-SNAPSHOT/maven-metadata.xml存在且包含以下内容：

<?xml version="1.0" encoding="UTF-8"?>
<metadata modelVersion="1.1.0">
  <groupId>tech.projectx</groupId>
  <artifactId>projectxcommon</artifactId>
  <version>1.0.0-SNAPSHOT</version>
  <versioning>
    <snapshot>
      <timestamp>20180418.113836</timestamp>
      <buildNumber>5</buildNumber>
    </snapshot>
    <lastUpdated>20180418113836</lastUpdated>
    <snapshotVersions>
      <snapshotVersion>
        <extension>jar</extension>
        <value>1.0.0-20180418.113836-5</value>
        <updated>20180418113836</updated>
      </snapshotVersion>
      <snapshotVersion>
        <extension>pom</extension>
        <value>1.0.0-20180418.113836-5</value>
        <updated>20180418113836</updated>
      </snapshotVersion>
    </snapshotVersions>
  </versioning>
</metadata>

我的应用程序的依赖关系树看起来像这样：

> mvn dependency:tree
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------< tech.projectx:projectx >------------------------
[INFO] Building projectx 1.0.0-beta.2
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-dependency-plugin:2.10:tree (default-cli) @ projectx ---
[INFO] tech.projectx:projectx:jar:1.0.0-beta.2
[INFO] +- tech.projectx:projectxcommon:jar:1.0.0-SNAPSHOT:compile
[INFO] |  +- org.bouncycastle:bcprov-jdk15on:jar:1.59:compile
[INFO] |  +- javax.validation:validation-api:jar:2.0.1.Final:compile
[INFO] |  +- org.hibernate.validator:hibernate-validator:jar:6.0.9.Final:compile
[INFO] |  |  +- org.jboss.logging:jboss-logging:jar:3.3.2.Final:compile
[INFO] |  |  \- com.fasterxml:classmate:jar:1.3.4:compile
[INFO] |  +- org.glassfish:javax.el:jar:3.0.1-b10:compile
[INFO] |  +- org.springframework:spring-context:jar:5.0.5.RELEASE:compile
[INFO] |  |  +- org.springframework:spring-aop:jar:5.0.5.RELEASE:compile
[INFO] |  |  \- org.springframework:spring-expression:jar:5.0.5.RELEASE:compile
[INFO] |  +- com.pubnub:pubnub-gson:jar:4.19.0:compile
[INFO] |  |  +- com.squareup.retrofit2:retrofit:jar:2.3.0:compile
[INFO] |  |  +- com.squareup.okhttp3:okhttp:jar:3.9.1:compile
[INFO] |  |  |  \- com.squareup.okio:okio:jar:1.13.0:compile
[INFO] |  |  +- com.squareup.okhttp3:logging-interceptor:jar:3.9.1:compile
[INFO] |  |  +- com.google.code.gson:gson:jar:2.8.2:compile
[INFO] |  |  \- com.squareup.retrofit2:converter-gson:jar:2.3.0:compile
[INFO] |  +- com.fasterxml.jackson.module:jackson-module-parameter-names:jar:2.9.5:compile
[INFO] |  +- com.fasterxml.jackson.datatype:jackson-datatype-jdk8:jar:2.9.5:compile
[INFO] |  \- com.fasterxml.jackson.datatype:jackson-datatype-jsr310:jar:2.9.5:compile
[INFO] +- org.projectlombok:lombok:jar:1.16.20:compile
[INFO] +- org.springframework:spring-web:jar:5.0.5.RELEASE:compile
[INFO] |  +- org.springframework:spring-beans:jar:5.0.5.RELEASE:compile
[INFO] |  \- org.springframework:spring-core:jar:5.0.5.RELEASE:compile
[INFO] |     \- org.springframework:spring-jcl:jar:5.0.5.RELEASE:compile
[INFO] +- org.springframework.retry:spring-retry:jar:1.2.2.RELEASE:compile
[INFO] +- com.fasterxml.jackson.core:jackson-databind:jar:2.9.5:compile
[INFO] |  +- com.fasterxml.jackson.core:jackson-annotations:jar:2.9.0:compile
[INFO] |  \- com.fasterxml.jackson.core:jackson-core:jar:2.9.5:compile
[INFO] +- org.kordamp.ikonli:ikonli-javafx:jar:2.1.1:compile
[INFO] |  \- org.kordamp.ikonli:ikonli-core:jar:2.1.1:compile
[INFO] +- org.kordamp.ikonli:ikonli-fontawesome5-pack:jar:2.1.1:compile
[INFO] +- net.harawata:appdirs:jar:1.0.1:compile
[INFO] |  +- org.slf4j:slf4j-api:jar:1.7.25:compile
[INFO] |  \- net.java.dev.jna:jna-platform:jar:4.5.0:compile
[INFO] |     \- net.java.dev.jna:jna:jar:4.5.0:compile
[INFO] +- io.sentry:sentry:jar:1.7.3:compile
[INFO] +- org.javassist:javassist:jar:3.22.0-CR2:compile
[INFO] \- junit:junit:jar:4.12:test
[INFO]    \- org.hamcrest:hamcrest-core:jar:1.3:test
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.188 s
[INFO] Finished at: 2018-04-23T20:38:39+01:00
[INFO] ------------------------------------------------------------------------

我的.cicleci\config.yml文件如下所示：

# Java Gradle CircleCI 2.0 configuration file
#
# Check https://circleci.com/docs/2.0/language-java/ for more details
#
version: 2
jobs:
  build:
    docker:
      # specify the version you desire here
      - image: circleci/jdk8:0.1.1

      # Specify service dependencies here if necessary
      # CircleCI maintains a library of pre-built images
      # documented at https://circleci.com/docs/2.0/circleci-images/
      # - image: circleci/postgres:9.4

    working_directory: ~/repo

    environment:
      # Customize the JVM maximum heap limit
      JVM_OPTS: -Xmx3200m
      TERM: dumb

    steps:
       - checkout

       - run: apt-get update

       - run: apt-get install --assume-yes maven

       - restore_cache:
           key: projectx-{{ checksum "pom.xml" }}

       - run: mvn --batch-mode --settings .circleci/settings.xml dependency:go-offline install -e -X

       - save_cache:
           paths:
             - ~/.m2
           key: projectx-{{ checksum "pom.xml" }}

       - run: mvn --batch-mode --settings .circleci/settings.xml test

我已为此存储桶启用了日志记录，并且一个条目看起来像这样（带有预期的404）：

https://gist.github.com/pupeno/da4f53a6e9673ff611909021306191a4#file-2018-04-23-21-10-39-7467973073c586b9

这是maven-metadata.xml的最后3次访问：

Answer 1

可能主要的问题是对Amazon S3存储库的请求太多。

通过分析日志，我们可以在短时间内看到来自Amazon S3的超过120个文件的请求1-3秒：

Maven正在下载Amazon S3中不存在的人工制品从Maven Central下载，Amazon S3的请求无用
每次下载都需要登录和退出请求，这很奇怪！
最后40个请求被拒绝连接
最后40个请求没有 [INFO]登录 - projectx-support 语句对于他们，所以可能会在短时间内登录一些限制？

要解决这个问题，至少有两个解决方案：

强制maven从Maven Central下载artefact FIRSTLY ，然后从Amazon S3休息，以减少对Amazon S3的请求。这是一个很好的解决方案，但请记住，如果你有更多只从Amazon S3下载的文物你会得到相同的问题！

默认情况下Maven Central来自存储库 LAST ，要设置最高优先级并先从Maven Center下载，我们必须在我们的存储库中的 FIRST 位置手动添加它，因为存储库的顺序也将 DECIDE 存储库访问的顺序。（Source）：

<repositories> <repository> <id>central</id> <name>Central Repository</name> <url>http://repo.maven.apache.org/maven2</url> <layout>default</layout> <snapshots> <enabled>false</enabled> </snapshots> </repository> <repository> <id>projectX-aws</id> <url>s3://projectX-support/maven2</url> <releases><enabled>true</enabled></releases> <snapshots><enabled>true</enabled></snapshots> </repository> </repositories>

通过Amazon S3上的 IP 找到更改请求限制的方法库。此解决方案将始终有效，但您的Amazon S3将获得许多无用的请求。

因此解决问题的最佳方法是混合使用这两种解决方案。：）

Answer 2

问题在于Maven本身在super POM中定义的Maven Central总是在存储库顺序中排在最后，因此，projectx的S3 repo受到许多失败请求的影响，最终AWS S3暂时阻止客户端，可以下载projectxcommon jar。

在S3存储库之前拥有Maven Central的唯一方法是在pom.xml repo之前的projectx-aws中手动定义它：

<repositories>
    <repository>
        <id>central</id>
        <name>Central Repository</name>
        <url>http://repo.maven.apache.org/maven2</url>
        <layout>default</layout>
        <snapshots>
            <enabled>false</enabled>
        </snapshots>
    </repository>
    <repository>
        <id>projectX-aws</id>
        <url>s3://projectX-support/maven2</url>
        <releases><enabled>true</enabled></releases>
        <snapshots><enabled>true</enabled></snapshots>
    </repository>
</repositories>

有关设置多个存储库及其顺序的更多信息，请访问：

Stack Overflow中的一些答案提到了字母顺序。至少在Maven 3中并非如此，只有它们被定义的顺序很重要。

Maven正试图从私有存储库安装每个jar

2 个答案: