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记录maven java.lang.String cannot be cast to XX error

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06/19
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在项目开发中自定义了一个maven plugin，在本地能够很好的工作，但是在ci server上却无法正常工作报错为：

----------------------------------------------------- at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:225)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:319)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
at org.jvnet.hudson.maven3.launcher.Maven3Launcher.main(Maven3Launcher.java:79)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchStandard(Launcher.java:329)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:239)
at org.jvnet.hudson.maven3.agent.Maven3Main.launch(Maven3Main.java:146)
at hudson.maven.Maven3Builder.call(Maven3Builder.java:127)
at hudson.maven.Maven3Builder.call(Maven3Builder.java:74)
at hudson.remoting.UserRequest.perform(UserRequest.java:118)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:326)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
Caused by: org.apache.maven.plugin.PluginExecutionException: A type incompatibility occured while executing [group id]:[artifact id]:[version]:start: java.lang.String cannot be cast to java.io.File
-----------------------------------------------------

在花费了我大半的时间，将本地环境的maven，jdk等设为和ci一致后最后定位到maven的版本问题，其终究原因是因为maven在3.0.3才支持配置参数为泛型集合(List<T>,Set<T>...)，在3.0.2及一下本班不支持此写法。

修改次error的方法有两种：

  1. 将ci Server的maven更新到3.0.3以上。(但是在我们的ci server更新有些困难，还有本人认为如果写一个plugin只能工作的固定version，这和一个废物差不多，所以选择了第二种方法)。
  2. 将泛型集合List<T>改为Array T[]。（项目中某大神写的List<File>我轻易的改为File[].在执行前改为Arrays.asList(XXX)）;

一切搞定。在此记录希望对于遇见同类问题的人有所帮助。