This closes #3173

artemis-core-client/src/main/java/org/apache/activemq/artemis/spi/core/remoting/ssl/SSLContextFactoryProvider.java

@@ -18,7 +18,9 @@ package org.apache.activemq.artemis.spi.core.remoting.ssl;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.Map;
 import java.util.ServiceLoader;
+import javax.net.ssl.SSLContext;
 
 /**
  * Provider that loads the SSLContextFactory services and return the one with the highest priority.
@@ -30,8 +32,25 @@ public class SSLContextFactoryProvider {
       ServiceLoader<SSLContextFactory> loader = ServiceLoader.load(SSLContextFactory.class, Thread.currentThread().getContextClassLoader());
       final List<SSLContextFactory> factories = new ArrayList<>();
       loader.forEach(factories::add);
-      Collections.sort(factories);
+      if (factories.isEmpty()) {
-      factory = factories.get(factories.size() - 1);
+         factory = new SSLContextFactory() {
+            @Override
+            public SSLContext getSSLContext(Map<String, Object> configuration,
+                  String keystoreProvider, String keystorePath, String keystorePassword,
+                  String truststoreProvider, String truststorePath, String truststorePassword,
+                  String crlPath, String trustManagerFactoryPlugin, boolean trustAll) throws Exception {
+               return SSLContext.getDefault();
+            }
+
+            @Override
+            public int getPriority() {
+               return -1;
+            }
+         };
+      } else {
+         Collections.sort(factories);
+         factory = factories.get(factories.size() - 1);
+      }
    }
    /**
     * @return the SSLContextFactory with the higher priority.

artemis-core-client/src/test/java/org/apache/activemq/artemis/spi/core/remoting/ssl/SSLContextFactoryProviderTest.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2020 The Apache Software Foundation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.activemq.artemis.spi.core.remoting.ssl;
+
+public class SSLContextFactoryProviderTest {
+   /**
+    * Test to access a SSLContextfactory without providing any implmentation via ServiceLaoder
+    */
+   public void testLoadSSLContextFactoryProviderWithoutAnyServices() {
+      SSLContextFactoryProvider.getSSLContextFactory().clearSSLContexts();
+   }
+}