Why can't my tomcat start?

Phenomenon:

Tomcat is installed and ready to deploy the Web project. I start Tomcat and find that there is no response.

Although it shows Tomcat started. However, this started is not the same as success. When we open the browser to access port 8080, we find that our tomcat is not started.

Most tutorials on the Internet teach us to check port usage or configure the JDK environment. But in fact, we should analyze the reasons so that we can effectively deduce the results (my initial mistake was that there was an erroneous war package, which caused Tomcat to fail to start. This could not be discovered if we followed the online tutorials)

All of tomcat's logs are stored in the tomcat logs directory. The logs when tomcat is started are stored in catalina.***.log. *** represents the date. We can find the catalina.***.log of the current date and locate the problem through the log information.

Port usage:

At this time, we can first find out the thread occupying the port:

lsof -nP -i:8080 

Then kill the thread:

kill -9 pid

Spelling error in file:

From the error message, we can see that the cause of this problem is a spelling error in the second line of the file. We open the file and find that there is a space in the first line of the file. Just delete the space in the first line.

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0"
metadata-complete="true">
 
<description> Servlet Example. </description>
<display-name> MyServlet Example </display-name>
<request-character-encoding>UTF-8</request-character-encoding>
 
<servlet>
<servlet-name>myServlet</servlet-name>
<servlet-class>MyServlet</servlet-class>
</servlet>
 
<servlet-mapping>
<servlet-name>myServlet</servlet-name>
<url-pattern>/myservlet</url-pattern>
</servlet-mapping>
 
</web-app>

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