我有一个带有服务器模块的spring boot gradle项目，我在build.gradle文件中使用了gradle war插件。
https://docs.gradle.org/current/userguide/web_project_tutorial.html
根据此链接：https://docs.spring.io/spring-boot/docs/current/reference/html/howto-traditional-deployment.html（80.1）
我重写了configure方法，我可以看到正在构建war文件并将其放在server / build / tmp目录中。
项目构建时，它还会在server / src / main / webapp创建一个空的webapp目录（这是默认的webAppDirName）。
需要进行战争，以便我们的操作人员可以在外部Tomcat容器上运行它。但是，为方便起见，我们的开发人员只是使用gradle包装器构建和运行＆gt; ./gradlew：server：使用嵌入式Tomcat容器启动。
我的问题是，当我们执行bootRun时，它会查看在构建过程中创建的空webapp文件夹并抛出此错误：
2016-02-23 10:51:32.632 INFO 83043 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 22443 (https)
2016-02-23 10:51:32.641 INFO 83043 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat
2016-02-23 10:51:32.642 INFO 83043 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.0.30
2016-02-23 10:51:32.673 ERROR 83043 --- [cat-startStop-1] org.apache.catalina.core.ContainerBase : A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[/imageretriever]]
at java.util.concurrent.FutureTask.report(FutureTask.java:122) [na:1.8.0_60]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) [na:1.8.0_60]
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:916) ~[tomcat-embed-core-8.0.30.jar:8.0.30]
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:871) [tomcat-embed-core-8.0.30.jar:8.0.30]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) [tomcat-embed-core-8.0.30.jar:8.0.30]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408) [tomcat-embed-core-8.0.30.jar:8.0.30]
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398) [tomcat-embed-core-8.0.30.jar:8.0.30]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_60]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_60]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_60]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_60]
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[/imageretriever]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) [tomcat-embed-core-8.0.30.jar:8.0.30]
... 6 common frames omitted
Caused by: org.apache.catalina.LifecycleException: Failed to start component [org.apache.catalina.webresources.StandardRoot@7f31763e]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) [tomcat-embed-core-8.0.30.jar:8.0.30]
at org.apache.c.core.StandardContext.resourcesStart(StandardContext.java:4928) ~[tomcat-embed-core-8.0.30.jar:8.0.30]
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5058) ~[tomcat-embed-core-8.0.30.jar:8.0.30]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) [tomcat-embed-core-8.0.30.jar:8.0.30]
... 6 common frames omitted
Caused by: java.lang.IllegalArgumentException: The main resource set specified [/Users/carlc/intellij_workspace/image-retriever/src/main/webapp] is not valid
at org.apache.catalina.webresources.StandardRoot.createMainResourceSet(StandardRoot.java:723) ~[tomcat-embed-core-8.0.30.jar:8.0.30]
at org.apache.catalina.webresources.StandardRoot.startInternal(StandardRoot.java:684) ~[tomcat-embed-core-8.0.30.jar:8.0.30]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) [tomcat-embed-core-8.0.30.jar:8.0.30]
... 9 common frames omitted
我认为这个问题可能与此相关：https://github.com/spring-projects/spring-boot/issues/1313
但我无法收集任何有用的信息。
我可以想到两个解决方案：1）在构建过程中删除有问题的webapp文件夹2）配置bootRun以忽略webapp文件夹3）你的建议在这里_____________：）
我可以根据您的要求发布您认为相关的build.gradle或其他代码。谢谢你的帮助。