Maven构建过程中 [ERROR] Malformed uxxxx encoding 的解决过程

Maven构建过程中 [ERROR] Malformed uxxxx encoding 的解决过程 背景

在使用CICD进行构建时，第一次构建成功，第二次之后就一直失败，异常信息如下：

[ERROR] Malformed uxxxx encoding.

java.lang.IllegalArgumentException: Malformed uxxxx encoding.

at java.util.Properties.loadConvert (Properties.java:574)

at java.util.Properties.load0 (Properties.java:390)

at java.util.Properties.load (Properties.java:341)

at org.eclipse.aether.internal.impl.TrackingFileManager.read (TrackingFileManager.java:64)

at org.eclipse.aether.internal.impl.DefaultUpdateCheckManager.read (DefaultUpdateCheckManager.java:511)

at org.eclipse.aether.internal.impl.DefaultUpdateCheckManager.checkmetadata (DefaultUpdateCheckManager.java:252)

at org.eclipse.aether.internal.impl.DefaultmetadataResolver.resolve (DefaultmetadataResolver.java:302)

at org.eclipse.aether.internal.impl.DefaultmetadataResolver.resolvemetadata (DefaultmetadataResolver.java:181)

at org.apache.maven.repository.internal.DefaultVersionRangeResolver.getVersions (DefaultVersionRangeResolver.java:198)

at org.apache.maven.repository.internal.DefaultVersionRangeResolver.resolveVersionRange (DefaultVersionRangeResolver.java:148)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.cachedResolveRangeResult (DefaultDependencyCollector.java:622)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.processDependency (DefaultDependencyCollector.java:395)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.processDependency (DefaultDependencyCollector.java:365)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.process (DefaultDependencyCollector.java:352)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.doRecurse (DefaultDependencyCollector.java:509)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.processDependency (DefaultDependencyCollector.java:461)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.processDependency (DefaultDependencyCollector.java:365)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.process (DefaultDependencyCollector.java:352)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.doRecurse (DefaultDependencyCollector.java:509)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.processDependency (DefaultDependencyCollector.java:461)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.processDependency (DefaultDependencyCollector.java:365)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.process (DefaultDependencyCollector.java:352)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.doRecurse (DefaultDependencyCollector.java:509)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.processDependency (DefaultDependencyCollector.java:461)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.processDependency (DefaultDependencyCollector.java:365)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.process (DefaultDependencyCollector.java:352)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.doRecurse (DefaultDependencyCollector.java:509)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.processDependency (DefaultDependencyCollector.java:461)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.processDependency (DefaultDependencyCollector.java:365)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.process (DefaultDependencyCollector.java:352)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.doRecurse (DefaultDependencyCollector.java:509)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.processDependency (DefaultDependencyCollector.java:461)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.processDependency (DefaultDependencyCollector.java:365)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.process (DefaultDependencyCollector.java:352)

at org.eclipse.aether.internal.impl.collect.DefaultDependencyCollector.collectDependencies (DefaultDependencyCollector.java:254)

at org.eclipse.aether.internal.impl.DefaultRepositorySystem.collectDependencies (DefaultRepositorySystem.java:284)

at org.apache.maven.project.DefaultProjectDependenciesResolver.resolve (DefaultProjectDependenciesResolver.java:169)

at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDependencies (LifecycleDependencyResolver.java:243)

at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.resolveProjectDependencies (LifecycleDependencyResolver.java:147)

at org.apache.maven.lifecycle.internal.MojoExecutor.ensureDependenciesAreResolved (MojoExecutor.java:248)

at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:202)

at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)

at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)

at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)

at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)

at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)

at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)

at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)

at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)

at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)

at org.apache.maven.cli.MavenCli.execute (MavenCli.java:957)

at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:289)

at org.apache.maven.cli.MavenCli.main (MavenCli.java:193)

at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke (Method.java:498)

at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)

at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)

at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)

at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)

思路一

先看看别人有没有遇到过，简单的说，先面向搜索引擎解决问题

搜索得到的结果如下：

清空本地maven仓库重新编译，因CICD的仓库不能动，PASS检查代码、配置文件中是否有带着 "" 字符的问题路径，修改成 "/"，查无这样的现象，PASS

思路二

别人的方法不管用，就只能自己上了，从上述搜索结果看，别人能通过这种问题解决，无非是maven仓库有问题，或者代码有问题

1、首先想到，本地打包没问题，那基本可以排除是代码的问题

2、maven仓库有问题，得看看maven的jar包更新策略，然后我找到了

3、受文章启发，我想到乱码可能出在 resolver-status.properties 文件，因为只有这个文件是maven写入本地仓库的

4、于是我本着试一试的态度去maven的issue搜了一下 resolver-status.properties ，然后，很巧的是我就看到了

5、大致上，是说 resolver-status.properties 会因为并发写入而损坏

6、于是我回到 CICD 的构建日志中，找到了出错位置上方DEBUG信息，信息如下：

  [DEBUG] Could not find metadata org.glassfish:javax.el/maven-metadata.xml in local (/data/repo)

7、结合2步骤的文章，推测是 org.glassfish:javax.el 的 resolver-status.properties 因为并发写入而损坏导致的问题

8、于是我联系CICD的运维人员，让他帮我看一下 org.glassfish:javax.el 下的 resolver-status.properties 是否存在乱码

9、最终确定是该文件乱码，删除后重新构建成功

思考 1、什么情况下会产生 resolver-status.properties

从远程仓库拉取jar包的时候，maven会更新该元文件，并且每次拉取都会更新。该文件主要作用是记录maven-metadata--nexus.xml 文件的上次更新时间戳，并结合标签完成更新策略的一部分。

2、什么情况下 resolver-status.properties 会有并发写入

从思路二的第4步，可以看到，maven 最初对该文件的写入是有加同步锁的，只是在 https://github.com/apache/maven-resolver/pull/67 之后，同步已在TrackingFileManager上被删除，而 DefaultmetadataResolver线程尝试并发写入该文件

3、怎么彻底解决 resolver-status.properties 的并发写入问题

构建命令中加入 -Daether.metadataResolver.threads=1， 该参数的含义是保证对 resolver-status.properties 的 *** 作是单线程的

 

Mave-resolver 1.6.x 中提供了解决办法，可以在构建命令中加入

-Dspot_file_with_malformed_encoding=true 来解决该问题

Update TrackingFileManager.java to help with MRESOLVER-153 by nvijayap · Pull Request #114 · apache/maven-resolver · GitHub