From 5bd332121fc753749129e8cbf35b76eb2cff5ee2 Mon Sep 17 00:00:00 2001
From: "markrmiller@gmail.com" <markrmiller@gmail.com>
Date: Mon, 13 Jul 2020 21:13:49 -0500
Subject: [PATCH] #131 - Make thread safe.

---
 .../org/apache/solr/security/JWTVerificationkeyResolver.java | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/solr/core/src/java/org/apache/solr/security/JWTVerificationkeyResolver.java b/solr/core/src/java/org/apache/solr/security/JWTVerificationkeyResolver.java
index 3aca77cd3a99..90fea3eceece 100644
--- a/solr/core/src/java/org/apache/solr/security/JWTVerificationkeyResolver.java
+++ b/solr/core/src/java/org/apache/solr/security/JWTVerificationkeyResolver.java
@@ -26,6 +26,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
 
 import org.apache.solr.common.SolrException;
 import org.jose4j.jwk.HttpsJwks;
@@ -56,9 +57,9 @@
 public class JWTVerificationkeyResolver implements VerificationKeyResolver {
   private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
 
-  private VerificationJwkSelector verificationJwkSelector = new VerificationJwkSelector();
+  private final VerificationJwkSelector verificationJwkSelector = new VerificationJwkSelector();
 
-  private Map<String, JWTIssuerConfig> issuerConfigs = new HashMap<>();
+  private Map<String, JWTIssuerConfig> issuerConfigs = new ConcurrentHashMap<>();
   private final boolean requireIssuer;
 
   /**