Eclipse 不能build, pom文件上面有叉叉 解决办法

Error message:

execution not covered by lifecycle configuration: org.apache.maven.plugins:maven-jar-plugin:2.3.1:jar (execution: default-jar, phase: process-classes)

多个子项目的pom.xml文件在eclipse下都有叉叉, 上面是error msg. 查阅网上资料, eclipse 读取pom.xml, 执行pom中的插件. 而m2e插件对pom中插件的不全部支持, eclipse就会提示pom.xml文件有错.

解决办法: 下载安装m2e-wtp插件, 可以在eclipse market中找到. 会解决大部分eclipse读取pom.xml的错误.

下面看看m2e-wtp插件的描述: 大概是加强eclipse中maven的支持, 依赖war/ejp/ear/rar.....

Maven Integration for Eclipse WTP (a.k.a m2e-wtp) aims at providing a tight integration between Maven Integration for Eclipse (a.k.a m2e) and the Eclipse Web Tools Project (WTP) .

m2e-wtp provides a set of m2e connectors used for the configuration of Java EE projects in WTP. It features :

•Support for war projects : adds the Java and Dynamic Web Facets. Support war overlays and on-the-fly resource filtering
•Support for ejb projects : adds the Java and EJB Facets.
•Support for ear projects : adds the EAR Facet. Supports application.xml and jboss.xml file generation, resource filtering
•Support for rar projects : adds the Java and Connector Facets.
•Support for app-client projects : adds the Java and Application Client Facets. Supports deployment descriptor filtering.
•Support for web-fragment projects : adds the Java and Web Fragment Facets if a web-fragment.xml file is detected in the resource folders.
•Support for jar dependency projects : adds the Java and Utility Facets.
Note that m2e-wtp requires m2e-wtp 1.0. You must make sure m2e's update site (http://download.eclipse.org/technology/m2e/releases/) is defined in :
Window > Preferences > Install / Update > Available Software Sites
Since m2e 1.0 is incompatible with previous versions, you may have to uninstall old m2e and m2e-wtp versions before proceeding with the installation.

再看看eclipse:

项目可以build了, delete后重新import, pom.xml和项目的叉叉都没了. 在打开pom.xml, 打开dependency hierarchy, 发现现在可以查看依赖关系了.

遗留问题1:

1. maven-dependency-plugin (goals "copy-dependencies", "unpack") is not supported by m2e.

<!--My pom.xml segment-->
...................
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<id>copy-mar-dependencies</id>
<phase>process-resources</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<includeTypes>mar</includeTypes>
<outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/modules</outputDirectory>
</configuration>
</execution>
<execution>
<id>copy-aar-dependencies</id>
<phase>process-resources</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<includeTypes>aar</includeTypes>
<outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/services</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
......................

问题解决:

原因: 我用的两个eclipse，这个是由于用了M2E插件造成的，而在m2eclipse下就没有这个问题。当然，你可以用其他的打包插件，这个不是必须要用这个，所以，只是自己知道原因和解决就可以了。不一定是要换环境解决，你可以换一个plugin也可以。/article/8617247.html

安装成功后, 有时项目会显示感叹号, 只要 update dependency, 感叹号变成叉叉, 再重新build就OK了. 项目就可以用eclipse编译, 替换jboss中class文件就可以了.

问题2: maven 提示找不到jdk. 没影响自己使用eclipse 中的maven.

warn info 贴上去, 答案遍地是. 我想说的是: 都试过, 不管用, 创建快捷方式,

添加: D:\tools\MVN+DE\eclipse\eclipse.exe -vm "C:\Program Files\Java\jdk1.6.0_30\bin\javaw.exe". 问题解决.