StandardCharsets can be used

Reports methods and constructors where constant charset String literal is used (like "UTF-8") which could be replaced with a predefined Charset object like StandardCharsets.UTF_8. This may work a little bit faster, because charset lookup becomes unnecessary. Also catching UnsupportedEncodingException may become unnecessary as well. In this case the catch block will be removed automatically.

crypto/src/main/java/org/springframework/security/crypto/bcrypt/BCrypt.java

@@ -733,11 +733,7 @@ public class BCrypt {
 	public static String hashpw(String password, String salt) {
 		byte passwordb[];
 
-		try {
-			passwordb = password.getBytes("UTF-8");
-		} catch (UnsupportedEncodingException uee) {
-			throw new AssertionError("UTF-8 is not supported");
-		}
+		passwordb = password.getBytes(StandardCharsets.UTF_8);
 
 		return hashpw(passwordb, salt);
 	}

crypto/src/main/java/org/springframework/security/crypto/codec/Utf8.java

@@ -19,6 +19,7 @@ import java.nio.ByteBuffer;
 import java.nio.CharBuffer;
 import java.nio.charset.CharacterCodingException;
 import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 
 /**
  * UTF-8 Charset encoder/decoder.
@@ -28,7 +29,7 @@ import java.nio.charset.Charset;
  * @author Luke Taylor
  */
 public final class Utf8 {
-	private static final Charset CHARSET = Charset.forName("UTF-8");
+	private static final Charset CHARSET = StandardCharsets.UTF_8;
 
 	/**
 	 * Get the bytes of the String in UTF-8 encoded form.

test/src/main/java/org/springframework/security/test/web/servlet/request/SecurityMockMvcRequestPostProcessors.java

@@ -18,6 +18,7 @@ package org.springframework.security.test.web.servlet.request;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.UnsupportedEncodingException;
+import java.nio.charset.StandardCharsets;
 import java.security.cert.CertificateException;
 import java.security.cert.CertificateFactory;
 import java.security.cert.X509Certificate;
@@ -638,12 +639,7 @@ public final class SecurityMockMvcRequestPostProcessors {
 		}
 
 		private static String md5Hex(String a2) {
-			try {
-				return DigestUtils.md5DigestAsHex(a2.getBytes("UTF-8"));
-			}
-			catch (UnsupportedEncodingException e) {
-				throw new RuntimeException(e);
-			}
+			return DigestUtils.md5DigestAsHex(a2.getBytes(StandardCharsets.UTF_8));
 		}
 	}
 
@@ -985,12 +981,7 @@ public final class SecurityMockMvcRequestPostProcessors {
 
 		private HttpBasicRequestPostProcessor(String username, String password) {
 			byte[] toEncode;
-			try {
-				toEncode = (username + ":" + password).getBytes("UTF-8");
-			}
-			catch (UnsupportedEncodingException e) {
-				throw new RuntimeException(e);
-			}
+			toEncode = (username + ":" + password).getBytes(StandardCharsets.UTF_8);
 			this.headerValue = "Basic " + new String(Base64.getEncoder().encode(toEncode));
 		}