diff --git a/oauth2/oauth2-jose/src/main/java/org/springframework/security/oauth2/jwt/JwtIssuerValidator.java b/oauth2/oauth2-jose/src/main/java/org/springframework/security/oauth2/jwt/JwtIssuerValidator.java
index 49a5845fec..b0a44c7789 100644
--- a/oauth2/oauth2-jose/src/main/java/org/springframework/security/oauth2/jwt/JwtIssuerValidator.java
+++ b/oauth2/oauth2-jose/src/main/java/org/springframework/security/oauth2/jwt/JwtIssuerValidator.java
@@ -15,6 +15,9 @@
  */
 package org.springframework.security.oauth2.jwt;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
 import org.springframework.security.oauth2.core.OAuth2Error;
 import org.springframework.security.oauth2.core.OAuth2ErrorCodes;
 import org.springframework.security.oauth2.core.OAuth2TokenValidator;
@@ -28,6 +31,8 @@ import org.springframework.util.Assert;
  * @since 5.1
  */
 public final class JwtIssuerValidator implements OAuth2TokenValidator<Jwt> {
+	private final Log logger = LogFactory.getLog(getClass());
+
 	private static OAuth2Error INVALID_ISSUER =
 			new OAuth2Error(
 					OAuth2ErrorCodes.INVALID_REQUEST,
@@ -57,6 +62,7 @@ public final class JwtIssuerValidator implements OAuth2TokenValidator<Jwt> {
 		if (this.issuer.equals(tokenIssuer)) {
 			return OAuth2TokenValidatorResult.success();
 		} else {
+			logger.debug(INVALID_ISSUER.getDescription());
 			return OAuth2TokenValidatorResult.failure(INVALID_ISSUER);
 		}
 	}
diff --git a/oauth2/oauth2-jose/src/main/java/org/springframework/security/oauth2/jwt/JwtTimestampValidator.java b/oauth2/oauth2-jose/src/main/java/org/springframework/security/oauth2/jwt/JwtTimestampValidator.java
index a3eb1ba907..915dc94bfd 100644
--- a/oauth2/oauth2-jose/src/main/java/org/springframework/security/oauth2/jwt/JwtTimestampValidator.java
+++ b/oauth2/oauth2-jose/src/main/java/org/springframework/security/oauth2/jwt/JwtTimestampValidator.java
@@ -20,11 +20,13 @@ import java.time.Duration;
 import java.time.Instant;
 import java.time.temporal.ChronoUnit;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
 import org.springframework.security.oauth2.core.OAuth2Error;
 import org.springframework.security.oauth2.core.OAuth2ErrorCodes;
 import org.springframework.security.oauth2.core.OAuth2TokenValidator;
 import org.springframework.security.oauth2.core.OAuth2TokenValidatorResult;
-import org.springframework.security.oauth2.jwt.Jwt;
 import org.springframework.util.Assert;
 
 /**
@@ -42,6 +44,8 @@ import org.springframework.util.Assert;
  * @see <a target="_blank" href="https://tools.ietf.org/html/rfc7519">JSON Web Token (JWT)</a>
  */
 public final class JwtTimestampValidator implements OAuth2TokenValidator<Jwt> {
+	private final Log logger = LogFactory.getLog(getClass());
+
 	private static final Duration DEFAULT_MAX_CLOCK_SKEW = Duration.of(60, ChronoUnit.SECONDS);
 
 	private final Duration maxClockSkew;
@@ -72,11 +76,8 @@ public final class JwtTimestampValidator implements OAuth2TokenValidator<Jwt> {
 
 		if (expiry != null) {
 			if (Instant.now(this.clock).minus(maxClockSkew).isAfter(expiry)) {
-				OAuth2Error error = new OAuth2Error(
-						OAuth2ErrorCodes.INVALID_REQUEST,
-						String.format("Jwt expired at %s", jwt.getExpiresAt()),
-						"https://tools.ietf.org/html/rfc6750#section-3.1");
-				return OAuth2TokenValidatorResult.failure(error);
+				OAuth2Error oAuth2Error = createOAuth2Error(String.format("Jwt expired at %s", jwt.getExpiresAt()));
+				return OAuth2TokenValidatorResult.failure(oAuth2Error);
 			}
 		}
 
@@ -84,17 +85,22 @@ public final class JwtTimestampValidator implements OAuth2TokenValidator<Jwt> {
 
 		if (notBefore != null) {
 			if (Instant.now(this.clock).plus(maxClockSkew).isBefore(notBefore)) {
-				OAuth2Error error = new OAuth2Error(
-						OAuth2ErrorCodes.INVALID_REQUEST,
-						String.format("Jwt used before %s", jwt.getNotBefore()),
-						"https://tools.ietf.org/html/rfc6750#section-3.1");
-				return OAuth2TokenValidatorResult.failure(error);
+				OAuth2Error oAuth2Error = createOAuth2Error(String.format("Jwt used before %s", jwt.getNotBefore()));
+				return OAuth2TokenValidatorResult.failure(oAuth2Error);
 			}
 		}
 
 		return OAuth2TokenValidatorResult.success();
 	}
 
+	private OAuth2Error createOAuth2Error(String reason) {
+		logger.debug(reason);
+		return new OAuth2Error(
+				OAuth2ErrorCodes.INVALID_REQUEST,
+				reason,
+				"https://tools.ietf.org/html/rfc6750#section-3.1");
+	}
+
 	/**
 	 * '
 	 * Use this {@link Clock} with {@link Instant#now()} for assessing