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the method getVirtualServerName has been added in ServletContext in Servlet 3.1. Find the java doc’s method

this problem can have at least 3 causes:

1. your servlet version is older that 3.1.

2. other jar has the servlet older version than 3.1.

3. your tomcat version is older than 8

to solve it, you can try the below way.

I. to check your pom.xml whether there are the below code.

   	   
    
     javax.servlet
    	   
    
     javax.servlet-api
           
    
     3.1.0
        
   

if your pom.xml has the above code, it would still has that problem. you can do the second way.

II. to check your other jar has refer to the javax.servlet-api jar. for example, the org.apache.santuario has refer to the javax.servlet-api jar. the pom.xml:

         
    
     org.apache.santuario
          
    
     xmlsec
          
    
     1.4.3
       
   

but when you look at the maven dependencies, it refer to the javax.servlet-api jar whose version is 2.3 older than 3.1.

so you should exclude the 2.3 version. pom.xml:

     
         
    
     org.apache.santuario
          
    
     xmlsec
          
    
     1.4.3
          
              
                   
      
       javax.servlet
                    
      
       servlet-api
                
           
      
       
     
         
    
     javax.servlet
          
    
     javax.servlet-api
          
    
     3.1.0
      
   

III. spring boot run the default tomcat 7. so define your tomcat version 8 instead of tomcat 7. To add the code your pom.xml:

   		
    
     UTF-8
    		
    
     UTF-8
    		
    
     1.8
            
    
     8.5.5
    	
   

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