Update exception variable names

Consistently use `ex` for caught exception and `cause` for Exception
constructor arguments.

Issue gh-8945

taglibs/src/main/java/org/springframework/security/taglibs/authz/AbstractAuthorizeTag.java

@@ -129,10 +129,8 @@ public abstract class AbstractAuthorizeTag {
 			accessExpression = handler.getExpressionParser().parseExpression(getAccess());
 
 		}
-		catch (ParseException e) {
-			IOException ioException = new IOException();
-			ioException.initCause(e);
-			throw ioException;
+		catch (ParseException ex) {
+			throw new IOException(ex);
 		}
 
 		return ExpressionUtils.evaluateAsBoolean(accessExpression, createExpressionEvaluationContext(handler));

taglibs/src/main/java/org/springframework/security/taglibs/authz/AuthenticationTag.java

@@ -102,8 +102,8 @@ public class AuthenticationTag extends TagSupport {
 				BeanWrapperImpl wrapper = new BeanWrapperImpl(auth);
 				result = wrapper.getPropertyValue(this.property);
 			}
-			catch (BeansException e) {
-				throw new JspException(e);
+			catch (BeansException ex) {
+				throw new JspException(ex);
 			}
 		}
 

taglibs/src/main/java/org/springframework/security/taglibs/authz/JspAuthorizeTag.java

@@ -79,8 +79,8 @@ public class JspAuthorizeTag extends AbstractAuthorizeTag implements Tag {
 			return TagLibConfig.evalOrSkip(this.authorized);
 
 		}
-		catch (IOException e) {
-			throw new JspException(e);
+		catch (IOException ex) {
+			throw new JspException(ex);
 		}
 	}
 
@@ -101,8 +101,8 @@ public class JspAuthorizeTag extends AbstractAuthorizeTag implements Tag {
 				this.pageContext.getOut().write(TagLibConfig.getSecuredUiSuffix());
 			}
 		}
-		catch (IOException e) {
-			throw new JspException(e);
+		catch (IOException ex) {
+			throw new JspException(ex);
 		}
 
 		return EVAL_PAGE;

taglibs/src/main/java/org/springframework/security/taglibs/csrf/AbstractCsrfTag.java

@@ -39,8 +39,8 @@ abstract class AbstractCsrfTag extends TagSupport {
 			try {
 				this.pageContext.getOut().write(this.handleToken(token));
 			}
-			catch (IOException e) {
-				throw new JspException(e);
+			catch (IOException ex) {
+				throw new JspException(ex);
 			}
 		}