Bye bye Groovy, you won't be missed :(

src/main/java/io/kamax/mxisd/lookup/provider/BridgeFetcher.java

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+/*
+ * mxisd - Matrix Identity Server Daemon
+ * Copyright (C) 2017 Maxime Dor
+ *
+ * https://max.kamax.io/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package io.kamax.mxisd.lookup.provider;
+
+import io.kamax.mxisd.config.RecursiveLookupBridgeConfig;
+import io.kamax.mxisd.lookup.SingleLookupReply;
+import io.kamax.mxisd.lookup.SingleLookupRequest;
+import io.kamax.mxisd.lookup.ThreePidMapping;
+import io.kamax.mxisd.lookup.fetcher.IBridgeFetcher;
+import org.apache.commons.lang.StringUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Optional;
+
+@Component
+public class BridgeFetcher implements IBridgeFetcher {
+
+    private Logger log = LoggerFactory.getLogger(BridgeFetcher.class);
+
+    @Autowired
+    private RecursiveLookupBridgeConfig cfg;
+
+    @Autowired
+    private RemoteIdentityServerFetcher fetcher;
+
+    @Override
+    public Optional<SingleLookupReply> find(SingleLookupRequest request) {
+        Optional<String> mediumUrl = Optional.ofNullable(cfg.getMappings().get(request.getType()));
+        if (mediumUrl.isPresent() && !StringUtils.isBlank(mediumUrl.get())) {
+            log.info("Using specific medium bridge lookup URL {}", mediumUrl.get());
+
+            return fetcher.find(mediumUrl.get(), request);
+        } else if (!StringUtils.isBlank(cfg.getServer())) {
+            log.info("Using generic bridge lookup URL {}", cfg.getServer());
+
+            return fetcher.find(cfg.getServer(), request);
+        } else {
+            log.info("No bridge lookup URL found/configured, skipping");
+
+            return Optional.empty();
+        }
+    }
+
+    @Override
+    public List<ThreePidMapping> populate(List<ThreePidMapping> mappings) {
+        log.warn("Bulk lookup on bridge lookup requested, but not supported - returning empty list");
+
+        return Collections.emptyList();
+    }
+
+}