Polish caught exception names

Prefer `ex` over `e`.

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/OnBeanCondition.java

@@ -205,7 +205,7 @@ class OnBeanCondition extends SpringBootCondition implements ConfigurationCondit
 			collectBeanNamesForAnnotation(names, beanFactory, annotationType,
 					considerHierarchy);
 		}
-		catch (ClassNotFoundException e) {
+		catch (ClassNotFoundException ex) {
 			// Continue
 		}
 		return StringUtils.toStringArray(names);

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jms/artemis/ArtemisAutoConfigurationTests.java

@@ -349,10 +349,10 @@ public class ArtemisAutoConfigurationTests {
 									+ "' was not expected but got " + destination);
 						}
 					}
-					catch (JMSException e) {
+					catch (JMSException ex) {
 						if (shouldExist) {
 							throw new IllegalStateException("Destination '" + name
-									+ "' was expected but got " + e.getMessage());
+									+ "' was expected but got " + ex.getMessage());
 						}
 					}
 					return null;

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/orm/jpa/CustomHibernateJpaAutoConfigurationTests.java

@@ -143,7 +143,7 @@ public class CustomHibernateJpaAutoConfigurationTests {
 				given(dataSource.getConnection().getMetaData())
 						.willReturn(mock(DatabaseMetaData.class));
 			}
-			catch (SQLException e) {
+			catch (SQLException ex) {
 				// Do nothing
 			}
 			return dataSource;

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/orm/jpa/JpaPropertiesTests.java

@@ -221,7 +221,7 @@ public class JpaPropertiesTests {
 			given(connection.getMetaData()).willReturn(metadata);
 			given(ds.getConnection()).willReturn(connection);
 		}
-		catch (SQLException e) {
+		catch (SQLException ex) {
 			// Do nothing
 		}
 		return ds;

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/security/SecurityAutoConfigurationTests.java

@@ -210,7 +210,7 @@ public class SecurityAutoConfigurationTests {
 			manager.authenticate(new UsernamePasswordAuthenticationToken("foo", "wrong"));
 			fail("Expected BadCredentialsException");
 		}
-		catch (BadCredentialsException e) {
+		catch (BadCredentialsException ex) {
 			// expected
 		}
 		assertThat(listener.event)