Fix proxy serialization errors

Author: vjovanov

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/reflect/proxy/DynamicProxySupport.java

@@ -156,7 +156,6 @@ private static Object createProxyClass(Class<?>[] interfaces) {
             }
             return clazz;
         } catch (Throwable t) {
-            LogUtils.warning("Could not create a proxy class from list of interfaces: %s. Reason: %s", Arrays.toString(interfaces), t.getMessage());
             return t;
         }
     }

substratevm/src/com.oracle.svm.hosted/src/com/oracle/svm/hosted/reflect/serialize/SerializationFeature.java

@@ -385,8 +385,12 @@ public void registerLambdaCapturingClass(ConfigurationCondition condition, Strin
     public void registerProxyClass(ConfigurationCondition condition, List<String> implementedInterfaces) {
         abortIfSealed();
         registerConditionalConfiguration(condition, (cnd) -> {
-            Class<?> proxyClass = proxyRegistry.createProxyClassForSerialization(implementedInterfaces);
-            register(cnd, proxyClass);
+            try {
+                Class<?> proxyClass = proxyRegistry.createProxyClassForSerialization(implementedInterfaces);
+                register(cnd, proxyClass);
+            } catch (IllegalArgumentException t) {
+                /* ignore: can't serialize class that can't be instantiated */
+            }
         });
     }