Large nested claim set causes stack overflow in toString

Author: jfreden

x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/security/authc/jwt/JwtRealm.java

@@ -263,12 +263,11 @@ public void authenticate(final AuthenticationToken authenticationToken, final Ac
                     + tokenPrincipal
                     + "] with header ["
                     + jwtAuthenticationToken.getSignedJWT().getHeader()
-                    + "] and claimSet ["
-                    + jwtAuthenticationToken.getJWTClaimsSet()
                     + "]";
 
                 if (logger.isTraceEnabled()) {
-                    logger.trace(msg, ex);
+                    // Large claim sets can cause stack overflow error, so only log when trace enabled
+                    logger.trace(msg + " and claimSet [" + jwtAuthenticationToken.getJWTClaimsSet() + "]", ex);
                 } else {
                     logger.debug(msg + " Cause: " + ex.getMessage()); // only log the stack trace at trace level
                 }