加载插件管理器时出错:无法创建类[org.codehaus.groovy.grails.plugins.web.mapping.UrlMappingsGrailsPlugin]的新实例

Question

在尝试创建Grails插件项目并使用以下命令时，收到有关在grails中加载UrlMappings插件的错误消息：

grails create-plugin user-management

然后在用户管理项目中：

grails create-pom xxx.xxxxx

mvn grails:run-app

我看了一下Error loading UrlMappingsPlugin中描述的建议解决方案，这个解决方案并没有解决我的问题。

来自maven info的系统详细信息：

Apache Maven 3.2.1 (ea8b2b07643dbb1b84b6d16e1f08391b666bc1e9; 2014-02-15T04:37:52+10:00)
Maven home: /usr/local/Cellar/maven/3.2.1/libexec
Java version: 1.7.0_71, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/jdk1.7.0_71.jdk/Contents/Home/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "mac os x", version: "10.10", arch: "x86_64", family: "mac"

请在下面找到完整的错误消息：

[INFO] Scanning for projects...
[WARNING]
[WARNING] Some problems were encountered while building the effective model for xxx.xxxxx:user-management:grails-plugin:0.1-SNAPSHOT
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-surefire-plugin is missing. @ line 74, column 21
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING]
[INFO]
[INFO] Using the builder org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder with a thread count of 1
[INFO]

[INFO] ------------------------------------------------------------------------
[INFO] Building user-management 0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- grails-maven-plugin:2.4.4:run-app (default-cli) @ user-management ---
|Loading Grails 2.4.4
|Configuring classpath
|Running pre-compiled script
.
|Environment set to development
.................................
|Packaging Grails application
.....................Error
|
Error loading plugin manager: Could not create a new instance of class [org.codehaus.groovy.grails.plugins.web.mapping.UrlMappingsGrailsPlugin]! (Use --stacktrace to see the full trace)

Answer 1

它似乎已经在Apache Maven 3.2.3中得到了修复，因为现在一切都运行得很好，没有任何错误。