Polish caught exception names

Prefer `ex` over `e`.

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/integrationtest/JmxEndpointIntegrationTests.java

@@ -105,7 +105,7 @@ public class JmxEndpointIntegrationTests {
 			getMBeanInfo(mBeanServer, objectName);
 			return true;
 		}
-		catch (InstanceNotFoundException e) {
+		catch (InstanceNotFoundException ex) {
 			return false;
 		}
 	}

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/export/prometheus/PrometheusScrapeEndpoint.java

@@ -50,10 +50,10 @@ public class PrometheusScrapeEndpoint {
 			TextFormat.write004(writer, this.collectorRegistry.metricFamilySamples());
 			return writer.toString();
 		}
-		catch (IOException e) {
+		catch (IOException ex) {
 			// This actually never happens since StringWriter::write() doesn't throw any
 			// IOException
-			throw new RuntimeException("Writing metrics failed", e);
+			throw new RuntimeException("Writing metrics failed", ex);
 		}
 	}
 

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/servlet/WebMvcMetricsFilterTests.java

@@ -250,8 +250,8 @@ public class WebMvcMetricsFilterTests {
 				result.set(this.mvc.perform(get("/api/c1/completableFuture/{id}", 1))
 						.andExpect(request().asyncStarted()).andReturn());
 			}
-			catch (Exception e) {
-				fail("Failed to execute async request", e);
+			catch (Exception ex) {
+				fail("Failed to execute async request", ex);
 			}
 		});
 		backgroundRequest.start();

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/webservices/WebServicesAutoConfiguration.java

@@ -146,7 +146,7 @@ public class WebServicesAutoConfiguration {
 				return this.applicationContext
 						.getResources(ensureTrailingSlash(location) + pattern);
 			}
-			catch (IOException e) {
+			catch (IOException ex) {
 				return new Resource[0];
 			}
 		}

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jooq/JooqPropertiesTests.java

@@ -101,7 +101,7 @@ public class JooqPropertiesTests {
 			given(connection.getMetaData()).willReturn(metadata);
 			given(ds.getConnection()).willReturn(connection);
 		}
-		catch (SQLException e) {
+		catch (SQLException ex) {
 			// Do nothing
 		}
 		return ds;

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

@@ -136,7 +136,7 @@ public class CustomHibernateJpaAutoConfigurationTests {
 				given(dataSource.getConnection().getMetaData())
 						.willReturn(mock(DatabaseMetaData.class));
 			}
-			catch (SQLException e) {
+			catch (SQLException ex) {
 				// Do nothing
 			}
 			return dataSource;

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

@@ -307,7 +307,7 @@ 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-project/spring-boot-test/src/test/java/org/springframework/boot/test/context/runner/AbstractApplicationContextRunnerTests.java

@@ -158,7 +158,7 @@ public abstract class AbstractApplicationContextRunnerTests<T extends AbstractAp
 								context.getClassLoader());
 						fail("Should have thrown a ClassNotFoundException");
 					}
-					catch (ClassNotFoundException e) {
+					catch (ClassNotFoundException ex) {
 						// expected
 					}
 				});

spring-boot-project/spring-boot-tools/spring-boot-test-support/src/main/java/org/springframework/boot/testsupport/testcontainers/Container.java

@@ -64,7 +64,7 @@ class Container implements TestRule {
 		try {
 			DockerClientFactory.instance().client();
 		}
-		catch (Throwable t) {
+		catch (Throwable ex) {
 			return new SkipStatement();
 		}
 		this.container = this.containerFactory.get();

spring-boot-project/spring-boot-tools/spring-boot-test-support/src/main/java/org/springframework/boot/testsupport/testcontainers/Neo4jContainer.java

@@ -62,8 +62,8 @@ public class Neo4jContainer extends Container {
 				Unreliables.retryUntilTrue((int) this.startupTimeout.getSeconds(),
 						TimeUnit.SECONDS, checkConnection(sessionFactory));
 			}
-			catch (TimeoutException e) {
-				throw new IllegalStateException();
+			catch (TimeoutException ex) {
+				throw new IllegalStateException(ex);
 			}
 		}