Merge branch '4.2.x'

Author: ryanjbaxter

spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/config/GatewayAutoConfiguration.java

@@ -16,9 +16,11 @@
 
 package org.springframework.cloud.gateway.config;
 
+import java.io.IOException;
 import java.security.KeyStore;
 import java.security.KeyStoreException;
 import java.security.NoSuchAlgorithmException;
+import java.security.cert.CertificateException;
 import java.util.List;
 import java.util.Set;
 import java.util.function.Supplier;
@@ -190,7 +192,6 @@
  * @author Mete Alpaslan Katırcıoğlu
  * @author Alberto C. Ríos
  * @author Olga Maciaszek-Sharma
- * @author Dominic Niemann
  */
 @Configuration(proxyBeanMethods = false)
 @ConditionalOnProperty(name = "spring.cloud.gateway.enabled", matchIfMissing = true)
@@ -359,10 +360,12 @@ public JsonToGrpcGatewayFilterFactory jsonToGRPCFilterFactory(GrpcSslConfigurer
 	@ConditionalOnMissingBean(GrpcSslConfigurer.class)
 	@ConditionalOnClass(name = "io.grpc.Channel")
 	public GrpcSslConfigurer grpcSslConfigurer(HttpClientProperties properties, SslBundles bundles)
-			throws KeyStoreException, NoSuchAlgorithmException {
+			throws KeyStoreException, NoSuchAlgorithmException, CertificateException, IOException {
 		TrustManagerFactory trustManagerFactory = TrustManagerFactory
 			.getInstance(TrustManagerFactory.getDefaultAlgorithm());
-		trustManagerFactory.init(KeyStore.getInstance(KeyStore.getDefaultType()));
+		KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
+		keyStore.load(null);
+		trustManagerFactory.init(keyStore);
 
 		return new GrpcSslConfigurer(properties.getSsl(), bundles);
 	}