我也遇到了这个问题：
我的项目是带有Spring的Struts2，现在我想将springboot添加到我的项目中， 然后我将struts2更新到2.5.18并添加springboot 2.1.1.RELEASE。这使用spring-core 5.1.3。
在这个项目中，我为Action和Controller使用注释，旧代码使用
Struts Action和新代码使用SpringMVC Controller。
但是该项目总是会产生500个错误：
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at com.opensymphony.xwork2.inject.ContainerBuilder$4.create(ContainerBuilder.java:161)
at com.opensymphony.xwork2.inject.Scope$2$1.create(Scope.java:52)
at com.opensymphony.xwork2.inject.ContainerImpl$ParameterInjector.inject(ContainerImpl.java:443)
at com.opensymphony.xwork2.inject.ContainerImpl.getParameters(ContainerImpl.java:457)
at com.opensymphony.xwork2.inject.ContainerImpl.access$000(ContainerImpl.java:33)
at com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector.inject(ContainerImpl.java:282)
... 51 more
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at com.opensymphony.xwork2.inject.ContainerImpl.inject(ContainerImpl.java:474)
at com.opensymphony.xwork2.inject.ContainerImpl$7.call(ContainerImpl.java:511)
at com.opensymphony.xwork2.inject.ContainerImpl.callInContext(ContainerImpl.java:564)
at com.opensymphony.xwork2.inject.ContainerImpl.inject(ContainerImpl.java:509)
at com.opensymphony.xwork2.config.impl.LocatableFactory.create(LocatableFactory.java:50)
at com.opensymphony.xwork2.inject.ContainerBuilder$4.create(ContainerBuilder.java:159)
... 56 more
Caused by: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
... 80 common frames omitted
at com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector.inject(ContainerImpl.java:284)
at com.opensymphony.xwork2.inject.ContainerImpl$ConstructorInjector.construct(ContainerImpl.java:417)
Caused by: java.lang.reflect.InvocationTargetException: null
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at com.opensymphony.xwork2.inject.ContainerImpl.inject(ContainerImpl.java:472)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
... 61 more
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
Caused by: java.lang.reflect.InvocationTargetException
at com.opensymphony.xwork2.inject.ContainerImpl$ConstructorInjector.construct(ContainerImpl.java:405)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
... 81 common frames omitted
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
Caused by: com.opensymphony.xwork2.config.ConfigurationException: Unknown default parent package [struts-default]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at org.apache.struts2.convention.ConventionUnknownHandler.<init>(ConventionUnknownHandler.java:108)
at java.lang.reflect.Method.invoke(Method.java:498)
... 86 common frames omitted
at com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector.inject(ContainerImpl.java:282)
... 63 more
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException - Class: com.opensymphony.xwork2.inject.ContainerBuilder$4
File: ContainerBuilder.java
Method: create
Line: 161 - com/opensymphony/xwork2/inject/ContainerBuilder.java:161:-1
at com.opensymphony.xwork2.DefaultUnknownHandlerManager.setContainer(DefaultUnknownHandlerManager.java:50)
... 68 more
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at com.opensymphony.xwork2.inject.ContainerBuilder$4.create(ContainerBuilder.java:161)
at com.opensymphony.xwork2.inject.Scope$2$1.create(Scope.java:52)
at com.opensymphony.xwork2.inject.ContainerImpl.getInstance(ContainerImpl.java:486)
at com.opensymphony.xwork2.inject.ContainerImpl$8.call(ContainerImpl.java:519)
at com.opensymphony.xwork2.inject.ContainerImpl.callInContext(ContainerImpl.java:564)
at com.opensymphony.xwork2.inject.ContainerImpl.getInstance(ContainerImpl.java:517)
at com.opensymphony.xwork2.DefaultUnknownHandlerManager.build(DefaultUnknownHandlerManager.java:78)
at com.opensymphony.xwork2.DefaultUnknownHandlerManager.setContainer(DefaultUnknownHandlerManager.java:48)
... 68 more
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at com.opensymphony.xwork2.inject.ContainerImpl.inject(ContainerImpl.java:474)
at com.opensymphony.xwork2.inject.ContainerImpl$7.call(ContainerImpl.java:511)
at com.opensymphony.xwork2.inject.ContainerImpl.callInContext(ContainerImpl.java:564)
at com.opensymphony.xwork2.inject.ContainerImpl.inject(ContainerImpl.java:509)
at com.opensymphony.xwork2.config.impl.LocatableFactory.create(LocatableFactory.java:50)
at com.opensymphony.xwork2.inject.ContainerBuilder$4.create(ContainerBuilder.java:159)
... 75 more
Caused by: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at com.opensymphony.xwork2.inject.ContainerImpl$ConstructorInjector.construct(ContainerImpl.java:422)
at com.opensymphony.xwork2.inject.ContainerImpl.inject(ContainerImpl.java:472)
... 80 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.opensymphony.xwork2.inject.ContainerImpl$ConstructorInjector.construct(ContainerImpl.java:405)
... 81 more
Caused by: Unknown default parent package [struts-default] - [unknown location]
at org.apache.struts2.convention.ConventionUnknownHandler.<init>(ConventionUnknownHandler.java:108)
... 86 more