[problem exploration and solution of one or more filters or listeners failing to start]

1. Problem description :

Use IDEA As a development tool , Use Maven As a project management tool , To complete a web project After use Tomcat Start the project as a server , Report errors One or more filters failed to start perhaps org.apache.catalina.core.StandardContext.startInternal One or more listeners Boot failure , See the corresponding container log file for more details , The cause of the error should be consistent .

2. The root cause :

stay Project deployment and operation environment Next , project-dependent jar The package was not imported into Project deployment environment in , To put it bluntly, there is a lack of jar package

3. Possible reasons for this :

establish Maven Project time , no choice Maven The architecture provided , Create a normal Maven project , Add web Framework support leads to , The project created in this way IDEA Project dependencies will not be automatically added jar Package to WEB-INF/lib Catalog . So create web Project time , If you want to use Maven As a project management tool , Try to choose Maven The project architecture provided can avoid

4. terms of settlement :

Put the missing jar Just import the package ,WEB-INF New under the directory lib Folder , The right choice Add copy of-->Library File, Add all the required dependencies of the project . As shown in the figure below

Specific operation ( Aim at IDEA development tool )

summary :

As can be seen from the illustration , If there is a lack of lib Folder or yours classes Folder If there is no project dependency in the same level directory , In the environment after the project deployment ,java Classes cannot find dependencies jar Bag .

Therefore, the following problems will occur

1. If the project is configured with a listener Listener, Project startup will fail , Report errors org.apache.catalina.core.StandardContext.startInternal One or more listeners Boot failure , See the corresponding container log file for more details

2. If the project is configured with filters Filter, Project startup will fail , Report errors One or more filters failed to start

3. If the project is not configured with the above two , Then you need to rely on others when accessing jar Bag java The program will report an error ClassNotFoundException

because Lisenter and Filter It starts when the container starts , You need to rely on jar package , If you can't find it , The container will fail to start , Ordinary Java The program is called only when it is accessed for the first time , So I will make mistakes in the interview

-------------------------------- The following is the original article -----------------------------------

Problem description :

Make a character encoding filter . register xml after ,Tomcat start-up web The project prompts the following error message :

org.apache.catalina.core.StandardContext.startInternal One or more filters failed to start .

take web.xml  The registration information annotation item in can work normally , So it is suspected that the problem is the filter

CharacterEncodingFilter.java

package com.shme.filter; import javax.servlet.*; import java.io.IOException; /** * @Desc Character encoding filter */ public class CharacterEncodingFilter implements Filter{ @Override public void init(FilterConfig filterConfig) throws ServletException { System.out.println("CharacterEncodingFilter Filter initialization "); } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { // Set up utf-8 request.setCharacterEncoding("utf-8"); response.setContentType("text/html"); response.setCharacterEncoding("utf-8"); chain.doFilter(request,response); } @Override public void destroy() { System.out.println("CharacterEncodingFilter Filter destruction "); } }

web.xml (3.1 edition )

<!-- Character encoding filter --> <filter> <filter-name>charset</filter-name> <filter-class>com.shme.filter.CharacterEncodingFilter</filter-class> </filter> <filter-mapping> <filter-name>charset</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>

terms of settlement :

reason :

Use Maven Create project ,IDEA Deploy to Tomcat Server time , In my development environment, there will be a chance to encounter non compilation java Under folder java Source file , Lead to tomcat When deploying a project , Filter Need to start first , stay web.xml When looking for mappings in , In the project file Filter The implementation class was not compiled , That's why it's wrong .

terms of settlement : Refer to another article by the author   A kind of Maven Do not compile when the project starts java File solutions - juyss - Blog Garden