fix checkstyle

web/src/main/java/org/springframework/security/web/access/channel/AbstractRetryEntryPoint.java

@@ -21,7 +21,6 @@ import org.springframework.util.Assert;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
-import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;

web/src/main/java/org/springframework/security/web/access/channel/ChannelEntryPoint.java

@@ -18,7 +18,6 @@ package org.springframework.security.web.access.channel;
 
 import java.io.IOException;
 
-import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 

web/src/main/java/org/springframework/security/web/authentication/AbstractAuthenticationTargetUrlRequestHandler.java

@@ -17,7 +17,6 @@ package org.springframework.security.web.authentication;
 
 import java.io.IOException;
 
-import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 

web/src/main/java/org/springframework/security/web/authentication/Http403ForbiddenEntryPoint.java

@@ -17,7 +17,6 @@ package org.springframework.security.web.authentication;
 
 import java.io.IOException;
 
-import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 

web/src/main/java/org/springframework/security/web/authentication/HttpStatusEntryPoint.java

@@ -15,9 +15,6 @@
  */
 package org.springframework.security.web.authentication;
 
-import java.io.IOException;
-
-import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 

web/src/main/java/org/springframework/security/web/authentication/logout/HttpStatusReturningLogoutSuccessHandler.java

@@ -18,7 +18,6 @@ package org.springframework.security.web.authentication.logout;
 
 import java.io.IOException;
 
-import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 

web/src/main/java/org/springframework/security/web/authentication/www/BasicAuthenticationEntryPoint.java

@@ -18,7 +18,6 @@ package org.springframework.security.web.authentication.www;
 
 import java.io.IOException;
 
-import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 

web/src/main/java/org/springframework/security/web/authentication/www/DigestAuthenticationEntryPoint.java

@@ -19,7 +19,6 @@ package org.springframework.security.web.authentication.www;
 import java.io.IOException;
 import java.util.Base64;
 
-import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 

web/src/main/java/org/springframework/security/web/context/AbstractSecurityWebApplicationInitializer.java

@@ -23,7 +23,6 @@ import javax.servlet.DispatcherType;
 import javax.servlet.Filter;
 import javax.servlet.FilterRegistration.Dynamic;
 import javax.servlet.ServletContext;
-import javax.servlet.ServletException;
 import javax.servlet.SessionTrackingMode;
 
 import org.springframework.context.ApplicationContext;

web/src/main/java/org/springframework/security/web/session/InvalidSessionStrategy.java

@@ -15,7 +15,6 @@
  */
 package org.springframework.security.web.session;
 
-import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;

web/src/main/java/org/springframework/security/web/session/SessionInformationExpiredStrategy.java

@@ -17,8 +17,6 @@ package org.springframework.security.web.session;
 
 import java.io.IOException;
 
-import javax.servlet.ServletException;
-
 /**
  * Determines the behaviour of the {@code ConcurrentSessionFilter} when an expired session
  * is detected in the {@code ConcurrentSessionFilter}.

web/src/test/java/org/springframework/security/web/access/channel/ChannelDecisionManagerImplTests.java

@@ -23,7 +23,6 @@ import java.util.List;
 import java.util.Vector;
 
 import javax.servlet.FilterChain;
-import javax.servlet.ServletException;
 
 import org.junit.Test;
 

web/src/test/java/org/springframework/security/web/access/channel/ChannelProcessingFilterTests.java

@@ -23,7 +23,6 @@ import java.io.IOException;
 import java.util.Collection;
 
 import javax.servlet.FilterChain;
-import javax.servlet.ServletException;
 
 import org.junit.Test;
 import org.springframework.mock.web.MockHttpServletRequest;

web/src/test/java/org/springframework/security/web/authentication/AbstractAuthenticationProcessingFilterTests.java

@@ -24,10 +24,7 @@ import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.verify;
 
-import java.io.IOException;
-
 import javax.servlet.FilterChain;
-import javax.servlet.ServletException;
 import javax.servlet.ServletRequest;
 import javax.servlet.ServletResponse;
 import javax.servlet.http.HttpServletRequest;

web/src/test/java/org/springframework/security/web/authentication/UsernamePasswordAuthenticationFilterTests.java

@@ -19,8 +19,6 @@ package org.springframework.security.web.authentication;
 import static org.mockito.Mockito.*;
 import static org.assertj.core.api.Assertions.*;
 
-import javax.servlet.ServletException;
-
 import org.junit.Test;
 import org.mockito.stubbing.Answer;
 import org.springframework.mock.web.MockHttpServletRequest;

web/src/test/java/org/springframework/security/web/authentication/preauth/Http403ForbiddenEntryPointTests.java

@@ -20,7 +20,6 @@ import static org.assertj.core.api.Assertions.fail;
 
 import java.io.IOException;
 
-import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletResponse;
 
 import org.springframework.mock.web.MockHttpServletRequest;
@@ -43,8 +42,5 @@ public class Http403ForbiddenEntryPointTests {
 		catch (IOException e) {
 			fail("Unexpected exception thrown: " + e);
 		}
-		catch (ServletException e) {
-			fail("Unexpected exception thrown: " + e);
-		}
 	}
 }