5

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

从文件夹中删除一些jar文件pom并将它们放入WEB-INF/lib文件夹后，它们不再可找到 - 我收到大量"Cannot find symbol"构建错误。

我还尝试将罐子放在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 jar 可以找到pom？

帕斯卡尔问题的更新：

以下是我收到的“无法找到资源”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 2.8 版有关，而不是我之前说的导致错误的 gdata 库。

这些是我正在尝试构建的项目的 pom 文件中相应的 htmlunit 条目：

    <dependency>
        <groupId>htmlunit</groupId>
        <artifactId>htmlunit</artifactId>
        <version>2.8</version>
    </dependency>
    <dependency>
        <groupId>htmlunit</groupId>
        <artifactId>apache-mime</artifactId>
        <version>0.6</version>
    </dependency>
    <dependency>
        <groupId>htmlunit</groupId>
        <artifactId>commons-codec</artifactId>
        <version>1.4</version>
    </dependency>
    <dependency>
        <groupId>htmlunit</groupId>
        <artifactId>commons-collections</artifactId>
        <version>3.2.1</version>
    </dependency>
    <dependency>
        <groupId>htmlunit</groupId>
        <artifactId>commons-logging</artifactId>
        <version>1.1.1</version>
    </dependency>
    <dependency>
        <groupId>htmlunit</groupId>
        <artifactId>cssparser</artifactId>
        <version>0.9.5</version>
    </dependency>
    <dependency>
        <groupId>htmlunit</groupId>
        <artifactId>htmlunit-core-js</artifactId>
        <version>2.8</version>
    </dependency>
    <dependency>
        <groupId>htmlunit</groupId>
        <artifactId>httpclient</artifactId>
        <version>4.0.1</version>
    </dependency>
    <dependency>
        <groupId>htmlunit</groupId>
        <artifactId>httpcore</artifactId>
        <version>4.0.1</version>
    </dependency>
    <dependency>
        <groupId>htmlunit</groupId>
        <artifactId>httpmime</artifactId>
        <version>4.0.1</version>
    </dependency>
    <dependency>
        <groupId>htmlunit</groupId>
        <artifactId>nekohtml</artifactId>
        <version>1.9.14</version>
    </dependency>
    <dependency>
        <groupId>htmlunit</groupId>
        <artifactId>sac</artifactId>
        <version>1.3</version>
    </dependency>
    <dependency>
        <groupId>htmlunit</groupId>
        <artifactId>serializer</artifactId>
        <version>2.7.1</version>
    </dependency>
    <dependency>
        <groupId>htmlunit</groupId>
        <artifactId>xalan</artifactId>
        <version>2.7.1</version>
    </dependency>
    <dependency>
        <groupId>htmlunit</groupId>
        <artifactId>xercesImpl</artifactId>
        <version>2.9.1</version>
    </dependency>
    <dependency>
        <groupId>htmlunit</groupId>
        <artifactId>xml-apis</artifactId>
        <version>1.3.04</version>
    </dependency>

正如您正确猜到的那样，我本地 maven 存储库中的 htmlunit 没有 pom 文件。我也不记得我是如何安装它的。在每个包含 jar 文件的子目录中，没有 pom 文件 - 而是一个名为的文件，例如，htmlunit-2.8.pom.lastUpdated它包含以下文本：

#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 - 嗯，它包含一些对我的项目至关重要的补丁。2.7 版从 maven 依赖项构建得很好：

<dependency>
   <groupId>net.sourceforge.htmlunit</groupId>
   <artifactId>htmlunit</artifactId>
   <version>2.7</version>
</dependency>

但是当我使用这个时：

<dependency>
   <groupId>net.sourceforge.htmlunit</groupId>
   <artifactId>htmlunit</artifactId>
   <version>2.8</version>
</dependency>

在构建过程中出现“命令行太长”的错误：

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.
4

2 回答 2

3

正如我在下面的评论中提到的，我想从 pom 中删除它们，因为即使它们在我的本地 Maven 存储库中，当 maven 正在构建项目时，它总是说它正在尝试下载这些本地依赖项中的每一个，从而增加了额外的时间到每个构建周期。

您没有显示任何说明确切问题的跟踪（这通常会有所帮助），但除非您的本地依赖项是 SNAPSHOT 依赖项（这对于手动安装的工件来说是一个糟糕的选择），我认为您对行为的描述不准确.

我希望将这些 jar 复制到构建过程可以找到它们的位置，但 Maven 不会每次都尝试下载任何资源。

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。在本地存储库中安装 JAR 时，您可以告诉 Maven 为您生成这个 pom：

mvn install:install-file -Dfile=your-artifact-1.0.jar \
                         [-DgroupId=org.some.group] \
                         [-DartifactId=你的工件] \
                         [-版本=1.0] \
                         [-Dpackaging=jar] \
                         [-DgeneratePom=true]

不管它看起来多么可怕，我发现 Maven 在这里的行为更可怕。

使用system范围依赖似乎并不可怕，这是一种可怕且不鼓励的做法，在 99,999% 的情况下都应该避免。引用提供的链接：

system：此依赖项在项目生命周期的某个阶段是必需的，但特定于系统。不鼓励使用此范围：这被认为是一种“高级”功能，只有在您真正了解其使用的所有后果时才应使用，如果不是实际上无法量化，这可能会非常困难。根据定义，此范围使您的构建不可移植。在某些边缘情况下可能是必要的。系统范围包括<systemPath>指向此依赖项在本地机器上的物理位置的元素。因此，它用于指代预期会出现在给定本地机器上而不是存储库中的某些工件；并且其路径可能因机器而异。元素可以在其systemPath路径中引用环境变量：${JAVA_HOME}例如。

只需以正确的方式使用 Maven，您就不会遇到问题。有了system作用域依赖（为什么人们总是建议滥用它们？！），我预测以后会有更多的麻烦。

正如您正确猜到的那样，我本地 maven 存储库中的 htmlunit 没有 pom 文件。我也不记得我是如何安装它的。

所以我没有疯 :) 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.pom手动创建。像这样的简单文件就足够了：

<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>ze.groupId</groupId>
  <artifactId>some-artifact-id</artifactId>
  <version>X.Y.Z</version>
</project>

但是请不要切换到system作用域依赖项，从长远来看，这弊大于利。

您可能会问我为什么使用 2.8 版 - 嗯，它包含一些对我的项目至关重要的补丁。

你当然有充分的理由，我什至不会讨论它们。

(...) 在构建过程中出现“命令行太长”的错误：

很不幸，您应该将此问题报告给 datanucleus。

于 2010-10-26T19:27:15.050 回答
1 
<dependency>
    <groupId>org.companyname</groupId>
    <artifactId>artifact</artifactId>
    <version>versionNumber</version>
    <scope>system</scope>
    <systemPath>PATH_TO_YOUR_JAR</systemPath>
</dependency>

尝试这样的事情

范围系统的依赖关系始终可用，并且不在存储库中查找。它们通常用于告诉 Maven JDK 或 VM 提供的依赖项。因此，系统依赖关系对于解决对工件的依赖关系特别有用，这些工​​件现在由 JDK 提供，但之前可以单独下载。典型的例子是 JDBC 标准扩展或 Java Authentication and Authorization Service (JAAS)。

一个简单的例子是：

<project>
  ...
  <dependencies>
    <dependency>
      <groupId>javax.sql</groupId>
      <artifactId>jdbc-stdext</artifactId>
      <version>2.0</version>
      <scope>system</scope>
      <systemPath>${java.home}/lib/rt.jar</systemPath>
    </dependency>
  </dependencies>
  ...
</project>
于 2010-10-26T16:25:30.000 回答