Question

我的问题是：如何将外部jar库添加到jsp / maven / eclipse项目中？第二个问题;如果我的问题是，我怀疑，我的pom.xml文件中的语法错误;什么是正确的？

我是一名经验丰富的经验丰富的Java开发人员，我正在寻求将我的专业知识扩展到Servlets和jsp编程。我正在试验这个。

我已经帮助建立了一个maven3 / eclipse（kepler）工作站，我已成功完成了几个基础教程。但是，我遇到了使用外部.jar来处理我的代码时遇到的严重困难。我尝试了几种解决方案。

在线提供的一个防弹解决方案就是将我的jar放入WEB-INF / lib，并通过＆lt;％@ page import = ...导入它们。导入适用于已包含的包，即Math等。它不适用于lib-folder中的外部jar。构建路径配置为普通的eclipse java项目。

在怀疑我没有指定我正在使用maven之后，在搜索解决方案时，这确实是一个重要的细节，我发现了很多关于pom.xml文件的不同建议。依赖关系和存储库是流行语。我尝试了一些不同的复制粘贴解决方案，但现在我的项目甚至不再构建了。当我尝试启动jetty服务器并构建项目时，这是我的错误消息：

H:\projects\xxx-releaseplan>mvn jetty:run
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building xxx-releaseplan Maven Webapp 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] >>> jetty-maven-plugin:8.1.13.v20130916:run (default-cli) @ xxx-releaseplan >>>
[WARNING] The POM for com.xxx.mrpb.model.jar:com.xxx.mrpb.model.jar:jar:1.0 is missing, no dependency information availabl
e
[WARNING] The POM for com.xxx.mrpb.viewmodel.jar:com.xxx.mrpb.viewmodel.jar:jar:1.0 is missing, no dependency information
available
[WARNING] The POM for servlet-api-2.5.jar:servlet-api-2.5.jar:jar:2.5 is missing, no dependency information available
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.299s
[INFO] Finished at: Tue Feb 25 13:47:26 CET 2014
[INFO] Final Memory: 2M/61M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project xxx-releaseplan: Could not resolve dependencies for project com.xxx.releaseplan
:xxx-releaseplan:war:1.0-SNAPSHOT: The following artifacts could not be resolved: com.xxx.mrpb.model.jar:com.xxx.mrpb.mode
l.jar:jar:1.0, com.xxx.mrpb.viewmodel.jar:com.xxx.mrpb.viewmodel.jar:jar:1.0, servlet-api-2.5.jar:servlet-api-2.5.jar:jar:
2.5: Failure to find com.xxx.mrpb.model.jar:com.xxx.mrpb.model.jar:jar:1.0 in http://repo.maven.apache.org/maven2 was cach
ed in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updat
es are forced -> [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/DependencyResolutionException
H:\projects\xxx-releaseplan>

我的pom.xml看起来像这样：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>dk.sdc.releaseplan</groupId>
    <artifactId>sdc-releaseplan</artifactId>
    <packaging>war</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>sdc-releaseplan Maven Webapp</name>
    <url>http://maven.apache.org</url>
    <dependencies>
        <dependency>
            <groupId>dk.sdc.mrpb.model.jar</groupId>
            <artifactId>dk.sdc.mrpb.model.jar</artifactId>
            <version>1.0</version>
            <scope>compile</scope>
            <type>jar</type>
        </dependency>
        <dependency>
            <groupId>dk.sdc.mrpb.viewmodel.jar</groupId>
            <artifactId>dk.sdc.mrpb.viewmodel.jar</artifactId>
            <version>1.0</version>
            <scope>compile</scope>
            <type>jar</type>
        </dependency>
        <dependency>
            <groupId>servlet-api-2.5.jar</groupId>
            <artifactId>servlet-api-2.5.jar</artifactId>
            <version>2.5</version>
            <scope>compile</scope>
            <type>jar</type>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <finalName>sdc-releaseplan</finalName>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
            </resource>
        </resources>
        <plugins>
            <!--<plugin> <groupId>ro.isdc.wro4j</groupId> <artifactId>wro4j-maven-plugin</artifactId> 
                <version>${wro4j.version}</version> <executions> <execution> <goals> <goal>jshint</goal> 
                </goals> </execution> </executions> <configuration> <options>devel,evil,noarg</options> 
                </configuration> </plugin> -->
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.2</version>
                <configuration>
                    <source>1.6</source>
                    <target>1.6</target>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-antrun-plugin</artifactId>
                <executions>
                    <execution>
                        <phase>initialize</phase>
                        <goals>
                            <goal>run</goal>
                        </goals>
                        <configuration>
                            <tasks>
                                <echo>********************************************</echo>
                                <echo>***** This project REQUIRES Maven 3.0+ *****</echo>
                                <echo>********************************************</echo>
                                <echo>mvn jetty:run - Running as un-assembled webapp</echo>
                                <echo>mvn jetty:run-war - Running as assembled webapp</echo>
                            </tasks>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <!-- Jetty Version: 8.x Home: Eclipse, Codehaus Java Version: 1.6 Protocols: 
                    HTTP/1.1 RFC2616, WebSocket, SPDY Servlet Version: 3.0 JSP Version: 2.1 http://wiki.eclipse.org/Jetty -->
                <groupId>org.mortbay.jetty</groupId>
                <artifactId>jetty-maven-plugin</artifactId>
                <version>8.1.13.v20130916</version>
                <configuration>
                    <webAppConfig>
                        <contextPath>/</contextPath>
                    </webAppConfig>
                    <scanIntervalSeconds>1</scanIntervalSeconds>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

Answer 1

错误

The following artifacts could not be resolved

表示jar文件在存储库位置不可用：http://repo.maven.apache.org/maven2。

这是在M2_HOME的settings.xml中配置的。检查仓库文件的版本是否在回购中可用。

如果您可以重新检查相关性是否可用，请检查您的互联网连接以下载该内容。

如果下载了jar文件，请检查users/.m2/repository/<your artifact path>以检查它是否已正确下载。

Maven / Eclipse外部jar故障排除

1 个答案: