java – 在`WEB-INF / lib`文件夹中找不到jar文件的解决方案,也

发布时间：2020-12-15 01:45:07 所属栏目：大数据来源：网络整理

导读：我有一个在Jetty / App Engine / Spring上运行的Java应用程序. 从pom中删除一些jar文件并将它们放入WEB-INF / lib文件夹后,它们不再可见我收到了大量的“无法找到符号”构建错误. 我也尝试将jar放在src / main / resources文件夹中但结果相同. 如何在不引

我有一个在Jetty / App Engine / Spring上运行的Java应用程序.

从pom中删除一些jar文件并将它们放入WEB-INF / lib文件夹后,它们不再可见 – 我收到了大量的“无法找到符号”构建错误.

我也尝试将jar放在src / main / resources文件夹中 – 但结果相同.

如何在不引用它们的情况下使这些罐子找到它们？

帕萨卡问题的最新消息：

以下是我收到的“无法查找资源”消息：

Downloading: http://maven-gae-plugin.googlecode.com/svn/repository/htmlunit/htmlunit/2.8/htmlunit-2.8.pom
[INFO] Unable to find resource 'htmlunit:htmlunit:pom:2.8' in repository maven-gae-repo (http://maven-gae-plugin.googlecode.com/svn/re
pository)
Downloading: https://repository.jboss.org/nexus/content/groups/public/htmlunit/htmlunit/2.8/htmlunit-2.8.pom
[INFO] Unable to find resource 'htmlunit:htmlunit:pom:2.8' in repository jboss-repo (https://repository.jboss.org/nexus/content/groups
/public)
Downloading: http://repo1.maven.org/maven2/htmlunit/htmlunit/2.8/htmlunit-2.8.pom
[INFO] Unable to find resource 'htmlunit:htmlunit:pom:2.8' in repository central (http://repo1.maven.org/maven2)
Downloading: http://maven-gae-plugin.googlecode.com/svn/repository/htmlunit/apache-mime/0.6/apache-mime-0.6.pom
[INFO] Unable to find resource 'htmlunit:apache-mime:pom:0.6' in repository maven-gae-repo (http://maven-gae-plugin.googlecode.com/svn
/repository)
Downloading: https://repository.jboss.org/nexus/content/groups/public/htmlunit/apache-mime/0.6/apache-mime-0.6.pom
[INFO] Unable to find resource 'htmlunit:apache-mime:pom:0.6' in repository jboss-repo (https://repository.jboss.org/nexus/content/gro
ups/public)
Downloading: http://repo1.maven.org/maven2/htmlunit/apache-mime/0.6/apache-mime-0.6.pom
[INFO] Unable to find resource 'htmlunit:apache-mime:pom:0.6' in repository central (http://repo1.maven.org/maven2)
Downloading: http://maven-gae-plugin.googlecode.com/svn/repository/htmlunit/commons-codec/1.4/commons-codec-1.4.pom
[INFO] Unable to find resource 'htmlunit:commons-codec:pom:1.4' in repository maven-gae-repo (http://maven-gae-plugin.googlecode.com/s
vn/repository)
Downloading: https://repository.jboss.org/nexus/content/groups/public/htmlunit/commons-codec/1.4/commons-codec-1.4.pom
[INFO] Unable to find resource 'htmlunit:commons-codec:pom:1.4' in repository jboss-repo (https://repository.jboss.org/nexus/content/g
roups/public)
Downloading: http://repo1.maven.org/maven2/htmlunit/commons-codec/1.4/commons-codec-1.4.pom
[INFO] Unable to find resource 'htmlunit:commons-codec:pom:1.4' in repository central (http://repo1.maven.org/maven2)
Downloading: http://maven-gae-plugin.googlecode.com/svn/repository/htmlunit/commons-collections/3.2.1/commons-collections-3.2.1.pom
[INFO] Unable to find resource 'htmlunit:commons-collections:pom:3.2.1' in repository maven-gae-repo (http://maven-gae-plugin.googleco
de.com/svn/repository)
Downloading: https://repository.jboss.org/nexus/content/groups/public/htmlunit/commons-collections/3.2.1/commons-collections-3.2.1.pom

[INFO] Unable to find resource 'htmlunit:commons-collections:pom:3.2.1' in repository jboss-repo (https://repository.jboss.org/nexus/c
ontent/groups/public)
Downloading: http://repo1.maven.org/maven2/htmlunit/commons-collections/3.2.1/commons-collections-3.2.1.pom
[INFO] Unable to find resource 'htmlunit:commons-collections:pom:3.2.1' in repository central (http://repo1.maven.org/maven2)
Downloading: http://maven-gae-plugin.googlecode.com/svn/repository/htmlunit/commons-logging/1.1.1/commons-logging-1.1.1.pom
[INFO] Unable to find resource 'htmlunit:commons-logging:pom:1.1.1' in repository maven-gae-repo (http://maven-gae-plugin.googlecode.c
om/svn/repository)
Downloading: https://repository.jboss.org/nexus/content/groups/public/htmlunit/commons-logging/1.1.1/commons-logging-1.1.1.pom
[INFO] Unable to find resource 'htmlunit:commons-logging:pom:1.1.1' in repository jboss-repo (https://repository.jboss.org/nexus/conte
nt/groups/public)
Downloading: http://repo1.maven.org/maven2/htmlunit/commons-logging/1.1.1/commons-logging-1.1.1.pom
[INFO] Unable to find resource 'htmlunit:commons-logging:pom:1.1.1' in repository central (http://repo1.maven.org/maven2)
Downloading: http://maven-gae-plugin.googlecode.com/svn/repository/htmlunit/cssparser/0.9.5/cssparser-0.9.5.pom
[INFO] Unable to find resource 'htmlunit:cssparser:pom:0.9.5' in repository maven-gae-repo (http://maven-gae-plugin.googlecode.com/svn
/repository)
Downloading: https://repository.jboss.org/nexus/content/groups/public/htmlunit/cssparser/0.9.5/cssparser-0.9.5.pom
[INFO] Unable to find resource 'htmlunit:cssparser:pom:0.9.5' in repository jboss-repo (https://repository.jboss.org/nexus/content/gro
ups/public)
Downloading: http://repo1.maven.org/maven2/htmlunit/cssparser/0.9.5/cssparser-0.9.5.pom
[INFO] Unable to find resource 'htmlunit:cssparser:pom:0.9.5' in repository central (http://repo1.maven.org/maven2)
Downloading: http://maven-gae-plugin.googlecode.com/svn/repository/htmlunit/htmlunit-core-js/2.8/htmlunit-core-js-2.8.pom
[INFO] Unable to find resource 'htmlunit:htmlunit-core-js:pom:2.8' in repository maven-gae-repo (http://maven-gae-plugin.googlecode.co
m/svn/repository)
Downloading: https://repository.jboss.org/nexus/content/groups/public/htmlunit/htmlunit-core-js/2.8/htmlunit-core-js-2.8.pom
[INFO] Unable to find resource 'htmlunit:htmlunit-core-js:pom:2.8' in repository jboss-repo (https://repository.jboss.org/nexus/conten
t/groups/public)
Downloading: http://repo1.maven.org/maven2/htmlunit/htmlunit-core-js/2.8/htmlunit-core-js-2.8.pom
[INFO] Unable to find resource 'htmlunit:htmlunit-core-js:pom:2.8' in repository central (http://repo1.maven.org/maven2)
Downloading: http://maven-gae-plugin.googlecode.com/svn/repository/htmlunit/httpclient/4.0.1/httpclient-4.0.1.pom
[INFO] Unable to find resource 'htmlunit:httpclient:pom:4.0.1' in repository maven-gae-repo (http://maven-gae-plugin.googlecode.com/sv
n/repository)
Downloading: https://repository.jboss.org/nexus/content/groups/public/htmlunit/httpclient/4.0.1/httpclient-4.0.1.pom
[INFO] Unable to find resource 'htmlunit:httpclient:pom:4.0.1' in repository jboss-repo (https://repository.jboss.org/nexus/content/gr
oups/public)
Downloading: http://repo1.maven.org/maven2/htmlunit/httpclient/4.0.1/httpclient-4.0.1.pom
[INFO] Unable to find resource 'htmlunit:httpclient:pom:4.0.1' in repository central (http://repo1.maven.org/maven2)
Downloading: http://maven-gae-plugin.googlecode.com/svn/repository/htmlunit/httpcore/4.0.1/httpcore-4.0.1.pom
[INFO] Unable to find resource 'htmlunit:httpcore:pom:4.0.1' in repository maven-gae-repo (http://maven-gae-plugin.googlecode.com/svn/
repository)
Downloading: https://repository.jboss.org/nexus/content/groups/public/htmlunit/httpcore/4.0.1/httpcore-4.0.1.pom
[INFO] Unable to find resource 'htmlunit:httpcore:pom:4.0.1' in repository jboss-repo (https://repository.jboss.org/nexus/content/grou
ps/public)
Downloading: http://repo1.maven.org/maven2/htmlunit/httpcore/4.0.1/httpcore-4.0.1.pom
[INFO] Unable to find resource 'htmlunit:httpcore:pom:4.0.1' in repository central (http://repo1.maven.org/maven2)
Downloading: http://maven-gae-plugin.googlecode.com/svn/repository/htmlunit/httpmime/4.0.1/httpmime-4.0.1.pom
[INFO] Unable to find resource 'htmlunit:httpmime:pom:4.0.1' in repository maven-gae-repo (http://maven-gae-plugin.googlecode.com/svn/
repository)
Downloading: https://repository.jboss.org/nexus/content/groups/public/htmlunit/httpmime/4.0.1/httpmime-4.0.1.pom
[INFO] Unable to find resource 'htmlunit:httpmime:pom:4.0.1' in repository jboss-repo (https://repository.jboss.org/nexus/content/grou
ps/public)
Downloading: http://repo1.maven.org/maven2/htmlunit/httpmime/4.0.1/httpmime-4.0.1.pom
[INFO] Unable to find resource 'htmlunit:httpmime:pom:4.0.1' in repository central (http://repo1.maven.org/maven2)
Downloading: http://maven-gae-plugin.googlecode.com/svn/repository/htmlunit/nekohtml/1.9.14/nekohtml-1.9.14.pom
[INFO] Unable to find resource 'htmlunit:nekohtml:pom:1.9.14' in repository maven-gae-repo (http://maven-gae-plugin.googlecode.com/svn
/repository)
Downloading: https://repository.jboss.org/nexus/content/groups/public/htmlunit/nekohtml/1.9.14/nekohtml-1.9.14.pom
[INFO] Unable to find resource 'htmlunit:nekohtml:pom:1.9.14' in repository jboss-repo (https://repository.jboss.org/nexus/content/gro
ups/public)
Downloading: http://repo1.maven.org/maven2/htmlunit/nekohtml/1.9.14/nekohtml-1.9.14.pom
[INFO] Unable to find resource 'htmlunit:nekohtml:pom:1.9.14' in repository central (http://repo1.maven.org/maven2)
Downloading: http://maven-gae-plugin.googlecode.com/svn/repository/htmlunit/sac/1.3/sac-1.3.pom
[INFO] Unable to find resource 'htmlunit:sac:pom:1.3' in repository maven-gae-repo (http://maven-gae-plugin.googlecode.com/svn/reposit
ory)
Downloading: https://repository.jboss.org/nexus/content/groups/public/htmlunit/sac/1.3/sac-1.3.pom
[INFO] Unable to find resource 'htmlunit:sac:pom:1.3' in repository jboss-repo (https://repository.jboss.org/nexus/content/groups/publ
ic)
Downloading: http://repo1.maven.org/maven2/htmlunit/sac/1.3/sac-1.3.pom
[INFO] Unable to find resource 'htmlunit:sac:pom:1.3' in repository central (http://repo1.maven.org/maven2)
Downloading: http://maven-gae-plugin.googlecode.com/svn/repository/htmlunit/serializer/2.7.1/serializer-2.7.1.pom
[INFO] Unable to find resource 'htmlunit:serializer:pom:2.7.1' in repository maven-gae-repo (http://maven-gae-plugin.googlecode.com/sv
n/repository)
Downloading: https://repository.jboss.org/nexus/content/groups/public/htmlunit/serializer/2.7.1/serializer-2.7.1.pom
[INFO] Unable to find resource 'htmlunit:serializer:pom:2.7.1' in repository jboss-repo (https://repository.jboss.org/nexus/content/gr
oups/public)
Downloading: http://repo1.maven.org/maven2/htmlunit/serializer/2.7.1/serializer-2.7.1.pom
[INFO] Unable to find resource 'htmlunit:serializer:pom:2.7.1' in repository central (http://repo1.maven.org/maven2)
Downloading: http://maven-gae-plugin.googlecode.com/svn/repository/htmlunit/xalan/2.7.1/xalan-2.7.1.pom
[INFO] Unable to find resource 'htmlunit:xalan:pom:2.7.1' in repository maven-gae-repo (http://maven-gae-plugin.googlecode.com/svn/rep
ository)
Downloading: https://repository.jboss.org/nexus/content/groups/public/htmlunit/xalan/2.7.1/xalan-2.7.1.pom
[INFO] Unable to find resource 'htmlunit:xalan:pom:2.7.1' in repository jboss-repo (https://repository.jboss.org/nexus/content/groups/
public)
Downloading: http://repo1.maven.org/maven2/htmlunit/xalan/2.7.1/xalan-2.7.1.pom
[INFO] Unable to find resource 'htmlunit:xalan:pom:2.7.1' in repository central (http://repo1.maven.org/maven2)
Downloading: http://maven-gae-plugin.googlecode.com/svn/repository/htmlunit/xercesImpl/2.9.1/xercesImpl-2.9.1.pom
[INFO] Unable to find resource 'htmlunit:xercesImpl:pom:2.9.1' in repository maven-gae-repo (http://maven-gae-plugin.googlecode.com/sv
n/repository)
Downloading: https://repository.jboss.org/nexus/content/groups/public/htmlunit/xercesImpl/2.9.1/xercesImpl-2.9.1.pom
[INFO] Unable to find resource 'htmlunit:xercesImpl:pom:2.9.1' in repository jboss-repo (https://repository.jboss.org/nexus/content/gr
oups/public)
Downloading: http://repo1.maven.org/maven2/htmlunit/xercesImpl/2.9.1/xercesImpl-2.9.1.pom
[INFO] Unable to find resource 'htmlunit:xercesImpl:pom:2.9.1' in repository central (http://repo1.maven.org/maven2)
Downloading: http://maven-gae-plugin.googlecode.com/svn/repository/htmlunit/xml-apis/1.3.04/xml-apis-1.3.04.pom
[INFO] Unable to find resource 'htmlunit:xml-apis:pom:1.3.04' in repository maven-gae-repo (http://maven-gae-plugin.googlecode.com/svn
/repository)
Downloading: https://repository.jboss.org/nexus/content/groups/public/htmlunit/xml-apis/1.3.04/xml-apis-1.3.04.pom
[INFO] Unable to find resource 'htmlunit:xml-apis:pom:1.3.04' in repository jboss-repo (https://repository.jboss.org/nexus/content/gro
ups/public)
Downloading: http://repo1.maven.org/maven2/htmlunit/xml-apis/1.3.04/xml-apis-1.3.04.pom
[INFO] Unable to find resource 'htmlunit:xml-apis:pom:1.3.04' in repository central (http://repo1.maven.org/maven2)

它们都与htmlunit版本2.8相关,而不是我之前说过导致错误的gdata库.

这些是我正在尝试构建的项目的pom文件中的相应htmlunit条目：

    
正如您所猜测的那样,我本地maven存储库中的htmlunit没有pom文件.我也记不起我是如何安装它的.在包含jar文件的每个子目录中都没有pom文件 – 而是一个名为htmlunit-2.8.pom.lastUpdated的文件,其中包含以下文本：

#Last modified on: Tue Oct 26 13:43:29 BST 2010
#Tue Oct 26 13:43:29 BST 2010
http://maven-gae-plugin.googlecode.com/svn/repository=1288097006231
https://repository.jboss.org/nexus/content/groups/public=1288097009578
http://repo1.maven.org/maven2=1288097009912

您可能会问我为什么使用2.8版本 – 嗯,它包含一些对我的项目至关重要的补丁.版本2.7从maven依赖构建良好：


但是当我使用它时：


在构建期间出现“命令行太长”时出错：

10/26/10 9:03:27 PM BST: [ERROR]  Standard error from the DataNucleus tool + org.datanucleus.enhancer.DataNucleusEnhancer :
10/26/10 9:03:27 PM BST: [ERROR] --------------------
10/26/10 9:03:27 PM BST: [ERROR] The command line is too long.


最佳答案


As I mentioned in a comment below,I want to remove them from the pom because even though they are in my local Maven repository,while maven is building the project it always says it is trying to download each of these local dependencies,adding extra time onto each build cycle. 

您没有显示任何描述确切问题的跟踪(这通常有帮助),但除非您的本地依赖项是SNAPSHOT依赖项(对于手动安装的工件,这将是一个糟糕的选择),我不认为您对该行为的描述是准确的.


I was hoping to copy these jars to a location where they will be found by the build process but without Maven trying to download any resources each time.

我的猜测是,依赖项只是缺少一个.pom文件,这是Maven试图下载的.使用以下命令在本地存储库中安装JAR时,可以告诉Maven为您生成此pom：

mvn install:install-file -Dfile=your-artifact-1.0.jar 
                         [-DgroupId=org.some.group] 
                         [-DartifactId=your-artifact] 
                         [-Dversion=1.0] 
                         [-Dpackaging=jar] 
                         [-DgeneratePom=true] 


Regardless of how horrible it may seem,I find Maven’s behavior here more horrible.

使用系统范围依赖性似乎并不可怕,这是一个可怕的discouraged实践,应该在99,999％的情况下避免.引用提供的链接：


system: This dependency is required in some phase of your project’s lifecycle,but is system-specific. Use of this scope is discouraged: This is considered an “advanced” kind of feature and should only be used when you truly understand all the ramifications of its use,which can be extremely hard if not actually impossible to quantify. This scope by definition renders your build non-portable. It may be necessary in certain edge cases. The system scope includes the  element which points to the physical location of this dependency on the local machine. It is thus used to refer to some artifact expected to be present on the given local machine an not in a repository; and whose path may vary machine-to-machine. The systemPath element can refer to environment variables in its path: ${JAVA_HOME} for instance.


只要以正确的方式使用Maven,就不会有问题.有了系统范围的依赖关系(为什么人们一直建议滥用它们？！),我预测会有更多的麻烦.


As you correctly guessed,the htmlunit that is in my local maven repository does not have pom files. I also can’t remember how I installed it.

所以我并不疯狂:)显然,我的建议是解决问题并提供丢失的.pom文件.如果您不想重新安装工件(以便Maven可以生成它们),您可以手动创建.pom.像这样的简单文件就足够了：


但请不要切换到系统范围的依赖关系,从长远来看,这将弊大于利.


You may be asking why I am using version 2.8 – well,it contains some patches that are essential for my project.

你当然有充分的理由,我甚至不会讨论它们.


(…) I get an error during the build that says “command line too long”:

这很不幸,你应该把这个问题报告给datanucleus.

                        （编辑：李大同）
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