Polish caught exception names

Prefer `ex` over `e`.

spring-boot-cli/src/main/java/org/springframework/boot/cli/command/init/ProjectGenerationRequest.java

@@ -359,8 +359,8 @@ class ProjectGenerationRequest {
 
 			return builder.build();
 		}
-		catch (URISyntaxException e) {
-			throw new ReportableException("Invalid service URL (" + e.getMessage() + ")");
+		catch (URISyntaxException ex) {
+			throw new ReportableException("Invalid service URL (" + ex.getMessage() + ")");
 		}
 	}
 

spring-boot-cli/src/main/java/org/springframework/boot/cli/compiler/DependencyManagementBomTransformation.java

@@ -222,8 +222,8 @@ public class DependencyManagementBomTransformation
 				return new UrlModelSource(
 						Grape.getInstance().resolve(null, dependency)[0].toURL());
 			}
-			catch (MalformedURLException e) {
-				throw new UnresolvableModelException(e.getMessage(), groupId, artifactId,
+			catch (MalformedURLException ex) {
+				throw new UnresolvableModelException(ex.getMessage(), groupId, artifactId,
 						version);
 			}
 		}

spring-boot-cli/src/main/java/org/springframework/boot/cli/compiler/maven/MavenSettingsReader.java

@@ -116,8 +116,8 @@ public class MavenSettingsReader {
 			try {
 				this._cipher = new DefaultPlexusCipher();
 			}
-			catch (PlexusCipherException e) {
-				throw new IllegalStateException(e);
+			catch (PlexusCipherException ex) {
+				throw new IllegalStateException(ex);
 			}
 		}