java.lang.ClassCastException:org.apache.catalina.util.DefaultAnnotationProcessor cannot be cast to o

本文介绍如何在Tomcat中通过修改context.xml文件来启用Loader委托功能。通过在context元素下添加特定配置,可以实现更灵活的应用加载策略。
修改了tomcat里的context.xml文件,在context 元素下添加 

<Loader delegate="true" />  
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[]] at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122) at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123) at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:800) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) at java.base/java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:264) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) at java.base/java.lang.Thread.run(Thread.java:833) Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[]] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) ... 7 more Caused by: java.lang.ClassCastException: class org.apache.tomcat.websocket.server.WsSci cannot be cast to class javax.servlet.ServletContainerInitializer (org.apache.tomcat.websocket.server.WsSci is in unnamed module of loader org.apache.catalina.loader.WebappClassLoader @1cee9abf; javax.servlet.ServletContainerInitializer is in unnamed module of loader org.codehaus.plexus.classworlds.realm.ClassRealm @17143b3b) at org.apache.catalina.startup.ContextConfig.getServletContainerInitializer(ContextConfig.java:1670) at org.apache.catalina.startup.ContextConfig.getServletContainerInitializers(ContextConfig.java:1652) at org.apache.catalina.startup.ContextCo
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