我正在尝试使用keyCloak 4.0.0(部署在服务器2(
来验证tomcat7 webApp(服务器1(我遵循此处列出的说明，但是每次尝试在tomcat上开发战争(服务器1(时，我都会收到此错误：
FAIL - Deployed application at context path /my _path but context failed to start
对应于tomcat中的此例外：
Apr 24, 2018 5:07:09 PM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Exception sending context initialized event to listener instance of class org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
java.lang.RuntimeException: Unable to instantiate MessageBodyReader
at org.jboss.resteasy.spi.ResteasyProviderFactory.registerProvider(ResteasyProviderFactory.java:760)
at org.jboss.resteasy.spi.ResteasyProviderFactory.registerProvider(ResteasyProviderFactory.java:742)
at org.jboss.resteasy.spi.ResteasyDeployment.registerProvider(ResteasyDeployment.java:505)
at org.jboss.resteasy.spi.ResteasyDeployment.registration(ResteasyDeployment.java:305)
at org.jboss.resteasy.spi.ResteasyDeployment.start(ResteasyDeployment.java:225)
at org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap.contextInitialized(ResteasyBootstrap.java:28)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5003)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5517)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1095)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:558)
at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1747)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(Unknown Source)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(Unknown Source)
at org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1516)
at org.apache.catalina.manager.ManagerServlet.deploy(ManagerServlet.java:739)
at org.apache.catalina.manager.ManagerServlet.doPut(ManagerServlet.java:457)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:653)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:614)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.RuntimeException: Illegal to inject a message body into a singleton into public org.codehaus.jackson.jaxrs.JacksonJsonProvider(org.codehaus.jackson.map.ObjectMapper,org.codehaus.jackson.jaxrs.Annotations[])
at org.jboss.resteasy.core.MessageBodyParameterInjector.inject(MessageBodyParameterInjector.java:209)
at org.jboss.resteasy.core.ConstructorInjectorImpl.injectableArguments(ConstructorInjectorImpl.java:63)
at org.jboss.resteasy.core.ConstructorInjectorImpl.construct(ConstructorInjectorImpl.java:129)
at org.jboss.resteasy.spi.ResteasyProviderFactory.getProviderInstance(ResteasyProviderFactory.java:1038)
at org.jboss.resteasy.spi.ResteasyProviderFactory.addMessageBodyReader(ResteasyProviderFactory.java:478)
at org.jboss.resteasy.spi.ResteasyProviderFactory.registerProvider(ResteasyProviderFactory.java:756)
... 49 more
也许我的问题与此相关。
令我困惑的是，这种错误确实不是似乎取决于我的战争应用程序。无论我试图在tomcat上部署哪种战争，即使战争没有使用KeyCloak，我也总是会有此错误。我的意思是：即使我的战争不包含任何"安全构成"元素，也没有"过滤"one_answers"角色名称"，也没有其他有关KeyCloak的内容(即我所有的页面都是公开的(，也没有部署时，我总是会出现故障错误。
这似乎与在此处显示的 keycloak-tomcat7-adapter-dist.zip jars的安装有关。如果我只是从 lib 文件夹中删除所有这些罐子，那么我解决了问题(但是，在这种情况下，我无法使用KeyCloak Authentication(。
我是否缺少某些东西(也许战争和KeyCloak必须生活在同一台Cat服务器中(，还是在KeyCloak Tomcat 7适配器中有一个错误？
解决问题！
在我的情况下，问题是由 resteasy库中的冲突生成的：我的WebApp的POM文件正在导入此版本的 resteasy-jackson-provider 库：
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxb-provider</artifactId>
<version>2.2.0.GA</version>
虽然KeyCloak Tomcat适配器正在使用这些罐子：
jackson-core-asl-1.9.9.jar
jackson-mapper-asl-1.9.9.jar
jackson-xc-1.9.9.jar
从这里我了解了2.2.0.GA是同一库的1.6.3版。可能是由于这个原因，我的类使用旧库(1.6.3(进行编译，然后使用较新版本的同一库(1.9.9，来自适配器(部署在tomcat上，这触发了错误。p>因此，我浏览了A resteasy-jackson-provider package package conkation ycunding akent yourtage bunce bunge bunge bunge attarge库的1.9.9版本(如此(，我解决了将它们加载到我的pom file中的问题：
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxb-provider</artifactId>
<version>2.3.10.Final</version>
希望这可以帮助别人！