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小编给大家分享一下maven在eclipse中的问题有哪些,相信大部分人都还不怎么了解,因此分享这篇文章给大家参考一下,希望大家阅读完这篇文章后大有收获,下面让我们一起去了解一下吧!
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Unrecognised tag
问题
由于我使用本地代理仓库,所以settings.xml设置如下:
nexus nexus Nexus http://localhost:8081/nexus/content/groups/public true true nexus Nexus http://localhost:8081/nexus/content/groups/public true true nexus
但在Maven编译时报了如下异常:
[WARNING] Some problems were encountered while building the effective settings
[WARNING] Unrecognised tag: 'activeProfiles' (position: START_TAG seen ...\n\t... @269:18) @ C:\Documents and Settings\Administrator.ZQFGROUP.000\.m2\settings.xml, line 269, column 18
[WARNING]
解决
这是因为错把activeProfiles配置到了profiles节点里了,应该把activeProfiles移到profiles之外,更多settings.xml配置信息请参考这里。
No goals
问题
Eclipse安装了Maven插件后,在项目的pom.xml上右键能看到如下:
而我自作聪明地认为:Maven build 与 mvn compile 是等价的,于是我再点击"Maven build..."之后,“Goals”是空的,如:
于是就报了这样的错误:
[ERROR] No goals have been specified for this build. You must specify a valid lifecycle phase or a goal in the format:or:[:]:. Available lifecycle phases are: validate, initialize, generate-sources, process-sources, generate-resources, process-resources, compile, process-classes, generate-test-sources, process-test-sources, generate-test-resources, process-test-resources, test-compile, process-test-classes, test, prepare-package, package, pre-integration-test, integration-test, post-integration-test, verify, install, deploy, pre-site, site, post-site, site-deploy, pre-clean, clean, post-clean. -> [Help 1]
解决
解决方法至少有两种:
再点击"Maven build..."之后,输入你要执行的“Goals”,如compile,clean,test等等;
在pom.xml中配置默认的Goal,如:
clean
作为project的子节点。
not a JRE
问题
在使用pom.xml配置默认Goal的时,如果默认的Goal为clean就没问题,但如果是如:
就会报错误:
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project Demo: Compilation failure
[ERROR] Unable to locate the Javac Compiler in:
[ERROR] C:\Program Files\Java\jre7\..\lib\tools.jar
[ERROR] Please ensure you are using JDK 1.4 or above and
[ERROR] not a JRE (the com.sun.tools.javac.Main class is required).
[ERROR] In most cases you can change the location of your Java
[ERROR] installation by setting the JAVA_HOME environment variable.
经过几番尝试,才发现并不是多个Goal的问题,而是compile Goal的问题。但使用命令的"mvn compile"又是OK的。
几经折腾才发现错误里说的很清楚:Please ensure you are using JDK 1.4 or above and not a JRE",它需要的是JDK而不是JRE。我给的项目中使用的是公共JRE:
解决
修改Eclipse的配置,使用JDK:Eclipse->Window->Preferences->Java->Installed JREs
system propery is not set
错误:-Dmaven.multiModuleProjectDirectory system propery is not set.
新建一个环境变量M2_HOME指向你的maven安装目录
M2_HOME=D:\study\apache-maven-3.3.3
然后在Window->Preference->Java->Installed JREs->Edit
在Default VM arguments中设置
-Dmaven.multiModuleProjectDirectory=$M2_HOME
5. Launching New_configuration
项目上右击->Run/Debug Settings->删除 new_Configuration.
以上是“maven在eclipse中的问题有哪些”这篇文章的所有内容,感谢各位的阅读!相信大家都有了一定的了解,希望分享的内容对大家有所帮助,如果还想学习更多知识,欢迎关注创新互联行业资讯频道!