.

src/main/java/com/tbyf/license/Constants.java

@@ -3,4 +3,5 @@ package com.tbyf.license;
 public class Constants {
 
     public static final String LICENSE_FILE_NAME = "hip.lic";
+    public static final String TEXT_PLAIN_MEDIA_TYPE = "text/plain;charset=UTF-8";
 }

src/main/java/com/tbyf/license/LicenseInstallationServlet.java

@@ -2,10 +2,8 @@ package com.tbyf.license;
 
 import lombok.Setter;
 import org.springframework.http.HttpStatus;
-import org.springframework.http.MediaType;
 
 import javax.servlet.ServletException;
-import javax.servlet.annotation.MultipartConfig;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
@@ -35,12 +33,12 @@ public class LicenseInstallationServlet extends HttpServlet {
             Files.copy(is, dest, StandardCopyOption.REPLACE_EXISTING);
             this.licenseManager.install(dest.toString());
             resp.setStatus(HttpStatus.OK.value());
-            resp.setContentType("text/plain;charset=UTF-8");
+            resp.setContentType(Constants.TEXT_PLAIN_MEDIA_TYPE);
             resp.getWriter().write("200");
         }
         catch (Exception e) {
             resp.setStatus(HttpStatus.BAD_REQUEST.value());
-            resp.setContentType("text/plain;charset=UTF-8");
+            resp.setContentType(Constants.TEXT_PLAIN_MEDIA_TYPE);
             resp.getWriter().write("400");
         }
     }

src/main/java/com/tbyf/license/LicenseValidationFilter.java

 package com.tbyf.license;
 
-import com.fasterxml.jackson.core.JsonProcessingException;
-import com.fasterxml.jackson.databind.ObjectMapper;
 import global.namespace.fun.io.api.NoContentException;
 import global.namespace.truelicense.api.LicenseManagementException;
 import global.namespace.truelicense.api.LicenseValidationException;
@@ -17,7 +15,6 @@ import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
 
 public class LicenseValidationFilter extends OncePerRequestFilter {

src/main/java/com/tbyf/license/MultipartConfig.java

-package com.tbyf.license;
-
-import org.springframework.boot.web.servlet.ServletContextInitializer;
-
-import javax.servlet.ServletContext;
-import javax.servlet.ServletException;
-
-public class MultipartConfig implements ServletContextInitializer {
-    @Override
-    public void onStartup(ServletContext servletContext) throws ServletException {
-
-    }
-}