我正在尝试从源代码构建Maven 3.5.2。(原因：我使用的是安装了 Maven 3.0.5 的机器，但不允许下载二进制文件(Maven 依赖项除外)，并且我需要更高版本的 Maven，所以我计划使用 Maven 3.0.5 来构建 Maven 3.5.2。根据文档，这是可能的。
我用来构建的机器也无法访问互联网。
Maven 构建尝试从apache.org访问 Apache 许可证，如果无法下载许可证文件，则会失败。特别是，这是构建输出的尾端(以 root 身份运行，尽管在 SElinux 下)：
[INFO] --- apache-rat-plugin:0.11:check (rat-check) @ apache-maven ---
[INFO] 51 implicit excludes (use -debug for more details).
[INFO] Exclude: src/test/resources*/**
[INFO] Exclude: src/test/projects/**
[INFO] Exclude: src/test/remote-repo/**
[INFO] Exclude: **/*.odg
[INFO] Exclude: src/bin/m2.conf
[INFO] Exclude: bootstrap/**
[INFO] Exclude: README.bootstrap.txt
[INFO] Exclude: .repository/**
[INFO] Exclude: .maven/spy.log
[INFO] Exclude: .java-version
[INFO] Exclude: README.md
[INFO] Exclude: DEPENDENCIES
[INFO] 19 resources included (use -debug for more details)
[INFO] Rat check: Summary of files. Unapproved: 0 unknown: 0 generated: 0 approved: 16 licence.
[INFO]
[INFO] --- maven-dependency-plugin:2.8:unpack-dependencies (unpack-jansi-native) @ apache-maven ---
[INFO] Unpacking /root/.m2/repository/org/fusesource/jansi/jansi/1.16/jansi-1.16.jar to /tmp/maven-build/apache-maven/target/dependency with includes "META-INF/native/**" and excludes ""
[INFO]
[INFO] --- maven-remote-resources-plugin:1.5:process (default) @ apache-maven ---
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] Apache Maven ...................................... SUCCESS [25.091s]
[INFO] Maven Model ....................................... SUCCESS [18.000s]
[INFO] Maven Artifact .................................... SUCCESS [4.418s]
[INFO] Maven Plugin API .................................. SUCCESS [4.677s]
[INFO] Maven Builder Support ............................. SUCCESS [1.900s]
[INFO] Maven Model Builder ............................... SUCCESS [5.690s]
[INFO] Maven Settings .................................... SUCCESS [1.905s]
[INFO] Maven Settings Builder ............................ SUCCESS [2.010s]
[INFO] Maven Repository Metadata Model ................... SUCCESS [1.511s]
[INFO] Maven Artifact Resolver Provider .................. SUCCESS [5.110s]
[INFO] Maven Core ........................................ SUCCESS [13.168s]
[INFO] Maven SLF4J Simple Provider ....................... SUCCESS [5.013s]
[INFO] Maven Embedder .................................... SUCCESS [3.617s]
[INFO] Maven Compat ...................................... SUCCESS [4.462s]
[INFO] Apache Maven Distribution ......................... FAILURE [4:18.467s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 5:58.134s
[INFO] Finished at: Mon Feb 12 21:03:11 GMT 2018
[INFO] Final Memory: 83M/190M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-remote-resources-plugin:1.5:process (default) on project apache-maven: Error rendering velocity resource. Invocation of method 'getResourceAsFile' in class org.codehaus.plexus.resource.DefaultResourceManager threw exception org.codehaus.plexus.resource.loader.ResourceNotFoundException: Could not find resource 'https://www.apache.org/licenses/LICENSE-2.0.txt'. at remote-resources[line 38, column 26] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR] mvn <goals> -rf :apache-maven
我认为也许远程资源插件是从 Apache 父 POM 中提取的东西，但我不确定，因为我无法完全弄清楚它是如何工作的。该配置似乎正在拉入已经包含LICENSE.txt的依赖apache-jar-resource-bundle，因此无需从Internet获取它。
有没有办法禁用远程资源检索(可能有利于本地资源)，最好是通过将命令行参数传递给 Maven，但如果失败，通过修改 Maven 根 POM 的本地副本？
编辑：添加完整堆栈跟踪。似乎该方法getResourceAsFile是使用 Velocity 的反射调用的，这让我认为必须有一个 Velocity 模板引用其中一个 Apache 工件中的getResourceAsFile，但我在 repo 中找不到任何东西 https://svn.apache.org/repos/asf/maven/resources/
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-remote-resources-plugin:1.5:process (default) on project apache-maven: Error rendering velocity resource. Invocation of method 'getResourceAsFile' in class org.codehaus.plexus.resource.DefaultResourceManager threw exception org.codehaus.plexus.resource.loader.ResourceNotFoundException: Could not find resource 'https://www.apache.org/licenses/LICENSE-2.0.txt'. at remote-resources[line 38, column 26] -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-remote-resources-plugin:1.5:process (default) on project apache-maven: Error rendering velocity resource.
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:217)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:90)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:508)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:414)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:357)
Caused by: org.apache.maven.plugin.MojoExecutionException: Error rendering velocity resource.
at org.apache.maven.plugin.resources.remote.ProcessRemoteResourcesMojo.processResourceBundles(ProcessRemoteResourcesMojo.java:1246)
at org.apache.maven.plugin.resources.remote.ProcessRemoteResourcesMojo.execute(ProcessRemoteResourcesMojo.java:520)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
... 19 more
Caused by: org.apache.velocity.exception.MethodInvocationException: Invocation of method 'getResourceAsFile' in class org.codehaus.plexus.resource.DefaultResourceManager threw exception org.codehaus.plexus.resource.loader.ResourceNotFoundException: Could not find resource 'https://www.apache.org/licenses/LICENSE-2.0.txt'. at remote-resources[line 38, column 26]
at org.apache.velocity.runtime.parser.node.ASTMethod.handleInvocationException(ASTMethod.java:243)
at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:187)
at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:280)
at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:567)
at org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:71)
at org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:142)
at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87)
at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87)
at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
at org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:420)
at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:207)
at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
at org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:420)
at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:207)
at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
at org.apache.velocity.runtime.RuntimeInstance.render(RuntimeInstance.java:1378)
at org.apache.velocity.runtime.RuntimeInstance.evaluate(RuntimeInstance.java:1314)
at org.apache.velocity.app.Velocity.evaluate(Velocity.java:254)
at org.apache.maven.plugin.resources.remote.ProcessRemoteResourcesMojo.processResourceBundles(ProcessRemoteResourcesMojo.java:1218)
... 22 more
Caused by: org.codehaus.plexus.resource.loader.ResourceNotFoundException: Could not find resource 'https://www.apache.org/licenses/LICENSE-2.0.txt'.
at org.codehaus.plexus.resource.DefaultResourceManager.getResource(DefaultResourceManager.java:173)
at org.codehaus.plexus.resource.DefaultResourceManager.getResourceAsFile(DefaultResourceManager.java:91)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:90)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:508)
at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:395)
at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:384)
at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:173)
... 41 more
编辑2：我想我找到了罪魁祸首：https://github.com/apache/maven/blob/maven-3.5.2/apache-maven/src/main/appended-resources/META-INF/LICENSE.vm
它将getResourceAsFile与许可证 URL 一起使用。
但我不知道这是从远程资源插件中提取的。
我不熟悉Apache Velocity。任何人都可以帮助如何覆盖它吗？
注意：不是问题33548395的重复，因为该问题是关于依赖项解析的，但这是关于远程资源的，这是不同的。正在下载的文件不是 Maven 依赖项，它只是一个文本文件。我希望它使用的相应 Maven 依赖项是apache-jar-resource-bundle，但该依赖项已经存在于我有权访问的远程存储库中，所以我不需要强制 Maven 在本地读取它。但是，它似乎确实尝试直接下载文件，而不是通过Maven依赖项。
在意识到 LICENSE.vm(以及 apache-maven 中的那个，而不是另一个)是问题所在(请参阅我的"EDIT 2")，我发现它也包含解决方案。Glassfish 的 URL 被手动重定向到另一个 URL，这位于第 32-35 行的文件中。所以我想我可以为我的场景做类似的事情。
首先，我计算了所有许可证并下载了它们。我给了他们所有扩展名.license这样我就可以告诉 Git 将此扩展名的文件视为二进制(通过.gitattributes)，这样它就不会试图通过转换行尾来弄乱文件，因为我想复制实际构建会做什么。我实际上总共只需要下载 5 个文件。
其次，我创建了一个小片段以插入到 VM 文件中;我称之为license-redirect-snippet.vm：
## redirect all license URLs to local files
#if ($url == "https://www.apache.org/licenses/LICENSE-2.0.txt")
#set ( $url = '/usr/local/share/maven-build-licenses/apache2-txt.license' )
#end
#if ($url == "http://www.apache.org/licenses/LICENSE-2.0.txt")
#set ( $url = '/usr/local/share/maven-build-licenses/apache2-txt.license' )
#end
#if ($url == "http://www.apache.org/licenses/LICENSE-2.0")
#set ( $url = '/usr/local/share/maven-build-licenses/apache2-html.license' )
#end
#if ($url == "https://glassfish.java.net/public/CDDLv1.0.html")
#set ( $url = '/usr/local/share/maven-build-licenses/cddl1-html.license' )
#end
#if ($url == "http://www.eclipse.org/legal/epl-v10.html")
#set ( $url = '/usr/local/share/maven-build-licenses/epl1-html.license' )
#end
#if ($url == "http://www.opensource.org/licenses/mit-license.php")
#set ( $url = '/usr/local/share/maven-build-licenses/mit-html.license' )
#end
注意：文件末尾有一行新行。
然后，只需将我的许可证复制到给定的文件夹(/usr/local/share/maven-build-licenses/)并使用sed在构建之前修改VM文件，在第35行之后添加代码片段：
sed -i '35r /tmp/license-redirect-snippet.vm' /tmp/maven-build/apache-maven/src/main/appended-resources/META-INF/LICENSE.vm
之后，构建通过！！
我本可以想出更好的办法，例如根据目录的内容和一些键值对动态生成代码段文件，甚至重写getResourceAsFile方法，以便不需要重写此变量，但对于只有 5 个许可证需要处理的简单情况来说，这似乎是矫枉过正。