arturobernalg commented on a change in pull request #129:
URL: https://github.com/apache/commons-crypto/pull/129#discussion_r553940280



##########
File path: src/main/java/org/apache/commons/crypto/utils/ReflectionUtils.java
##########
@@ -30,7 +32,7 @@
  */
 public final class ReflectionUtils {
 
-    private static final Map<ClassLoader, Map<String, 
WeakReference<Class<?>>>> CACHE_CLASSES = new WeakHashMap<>();
+    private static final ConcurrentMap<ClassLoader, Map<String, 
WeakReference<Class<?>>>> CACHE_CLASSES = new ConcurrentHashMap<>();

Review comment:
       HI @garydgregory 
   In order to solve the PMD warning --> 
https://pmd.github.io/latest/pmd_rules_java_multithreading.html#useconcurrenthashmap

##########
File path: pom.xml
##########
@@ -731,5 +731,18 @@ The following provides more details on the included 
cryptographic software:
       <artifactId>junit-jupiter</artifactId>
       <scope>test</scope>
     </dependency>
+    <!-- benchmark -->
+    <dependency>
+      <groupId>org.openjdk.jmh</groupId>
+      <artifactId>jmh-core</artifactId>
+      <version>${jmh.version}</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.openjdk.jmh</groupId>
+      <artifactId>jmh-generator-annprocess</artifactId>
+      <version>${jmh.version}</version>
+      <scope>test</scope>
+    </dependency>

Review comment:
       It wouldn't let me debug. I always getting error because it was not 
possible find all the package org.openjdk.jmh




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