我在给java项目配置Filter过滤器时报org.apache.catalina.core.StandardContext.filterStart 启动过滤器异常，具体的异常信息如下：

12-Oct-2020 18:21:48.454 严重 [RMI TCP Connection(27)-127.0.0.1] org.apache.catalina.core.StandardContext.filterStart 启动过滤器异常
java.lang.AbstractMethodError
at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:283)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:264)
at org.apache.catalina.core.ApplicationFilterConfig.(ApplicationFilterConfig.java:108)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4546)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5191)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
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:714)
at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1720)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:287)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:483)
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:432)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:287)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
at javax.management.remote.rmi.RMIConnectionImpl.access $PrivilegedOperation.run(RMIConnectionImpl.java:1309) at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401) at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829) at sun.reflect.GeneratedMethodAccessor32.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:346) at sun.rmi.transport.Transport$1.run(Transport.java:200) at sun.rmi.transport.Transport$

然后在项目部署的前台报：

[2020-10-12 06:21:48,984] Artifact studentManVueTest2:war exploded: Error during artifact deployment. See server log for details.

代码(一个登录的过滤认证)：

@WebFilter("/*")
public class AuthorizationFilters implements Filter {

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest)servletRequest;
        HttpServletResponse response = (HttpServletResponse)servletResponse;

        String uri = request.getRequestURI();

        if (uri.contains("/login.html") ||
            uri.contains("/adminLoginServlet") ||
            uri.contains("/js/") ||
            uri.contains("/img/") ||
            uri.contains("/css/") ||
            uri.contains("/plugins/")){

            filterChain.doFilter(servletRequest, servletResponse);
        }else{
            Admin admin = (Admin) request.getSession().getAttribute("admin");
            if (admin != null){
                filterChain.doFilter(servletRequest, servletResponse);
            }else{
                response.setStatus(401);
            }
        }
    }

}

原因分析：

我查看了日志，发现我的Filter并没有初始化：
所以我们看一个先看一下Filter接口中的方法：

public interface Filter {
    default void init(FilterConfig filterConfig) throws ServletException {
    }

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

    default void destroy() {
    }
}

解决方案：

最后我把init与destroy重写后，项目就可以成功部署了：

@WebFilter("/*")
public class AuthorizationFilters implements Filter {
    @Override
    public void init(FilterConfig filterConfig) {
        
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest)servletRequest;
        HttpServletResponse response = (HttpServletResponse)servletResponse;

        String uri = request.getRequestURI();

        if (uri.contains("/login.html") ||
            uri.contains("/adminLoginServlet") ||
            uri.contains("/js/") ||
            uri.contains("/img/") ||
            uri.contains("/css/") ||
            uri.contains("/plugins/")){

            filterChain.doFilter(servletRequest, servletResponse);
        }else{
            Admin admin = (Admin) request.getSession().getAttribute("admin");
            if (admin != null){
                filterChain.doFilter(servletRequest, servletResponse);
            }else{
                response.setStatus(401);
            }
        }
    }

    @Override
    public void destroy() {
        
    }
}