springboot打的war包，放tomcat下始终运行不成功（maven学习过程）

接上文：
springboot打war包步骤

打好的war包放tomcat下部署，启动报错
1、报错信息一：

26-Oct-2021 11:51:54.707 SEVERE [localhost-startStop-1] org.apache.catalina.startup.ContextConfig.processAnnotationsJar Unable to process Jar entry [module-info.class] from Jar [file:/D:/JavaInstall/apache-tomcat-8.5.5/apache-tomcat-8.5.5/webapps/bs-chatmg-server-0.0.1-SNAPSHOT/WEB-INF/lib/jakarta.activation-2.0.1.jar] for annotations
 org.apache.tomcat.util.bcel.classfile.ClassFormatException: Invalid byte tag in constant pool: 19
        at org.apache.tomcat.util.bcel.classfile.Constant.readConstant(Constant.java:97)
        at org.apache.tomcat.util.bcel.classfile.ConstantPool.(ConstantPool.java:54)
        at org.apache.tomcat.util.bcel.classfile.ClassParser.readConstantPool(ClassParser.java:174)
        at org.apache.tomcat.util.bcel.classfile.ClassParser.parse(ClassParser.java:83)
        at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2053)
        at org.apache.catalina.startup.ContextConfig.processAnnotationsJar(ContextConfig.java:2000)
        at org.apache.catalina.startup.ContextConfig.processAnnotationsUrl(ContextConfig.java:1970)
  

这里报错，我是将多余的jar包进行逐个删除后，就没有报错了

2、报错信息二：

26-Oct-2021 11:51:12.010 严重 [localhost-startStop-1] org.apache.catalina.core.StandardContext.startInternal Error during ServletContainerInitializer processing
        javax.servlet.ServletException: Failed to instantiate WebApplicationInitializer class
                at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:157)
                at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5154)
                at org.apache.catalina.util.Lifecyclebase.start(Lifecyclebase.java:183)
                at org.apache.catalina.core.Containerbase.addChildInternal(Containerbase.java:743)
                at org.apache.catalina.core.Containerbase.addChild(Containerbase.java:719)
                at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:705)
                at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1125)
                at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1859)
                at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
                at java.util.concurrent.FutureTask.run(FutureTask.java:266)
                at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
                at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
                at java.lang.Thread.run(Thread.java:748)
        Caused by: java.lang.NoSuchMethodError: org.springframework.util.ReflectionUtils.accessibleConstructor(Ljava/lang/Class;[Ljava/lang/Class;)Ljava/lang/reflect/Constructor;
                at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:154)

这里报错是由于maven中有jar包冲突导致，消除冲突即可（消除冲突通过maven helper）

3、报错信息三：

26-Oct-2021 14:04:21.249 SEVERE [catalina-exec-92] org.apache.catalina.core.StandardContext.startInternal One or more Filters failed to start. Full details will be found in the appropriate container log file
26-Oct-2021 14:04:21.250 SEVERE [catalina-exec-92] org.apache.catalina.core.StandardContext.startInternal Context [/bs-chatmg-server] startup failed due to previous errors
26-Oct-2021 14:04:21.302 WARNING [catalina-exec-92] org.apache.catalina.loader.WebappClassLoaderbase.clearReferencesThreads The web application [bs-chatmg-server] appears to have started a thread named [Abandoned connection cleanup thread] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
 java.lang.Object.wait(Native Method)
 java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:144)
 com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:43)

这里报错原因是因为，项目不再用内置的tomcat，我项目中的springboot的版本高，所以实现filter，不需要实现其方法init、destroy，但是放在tomcat8下，filter需要实现这些，实现后，项目就不会报这种错误了

default void init(FilterConfig filterConfig) throws ServletException {
}

void doFilter(ServletRequest var1, ServletResponse var2, FilterChain var3) throws IOException, ServletException;

default void destroy() {
}