diff --git a/binding/java/src/main/java/org/lionsoul/ip2region/service/Config.java b/binding/java/src/main/java/org/lionsoul/ip2region/service/Config.java
index 1e4fbb3..c916980 100644
--- a/binding/java/src/main/java/org/lionsoul/ip2region/service/Config.java
+++ b/binding/java/src/main/java/org/lionsoul/ip2region/service/Config.java
@@ -66,7 +66,7 @@ public class Config {
         sb.append('{');
         sb.append("cache_policy:").append(cachePolicy).append(',');
         sb.append("version:").append(ipVersion.toString()).append(',');
-        sb.append("xdb_path:").append(xdbFile.getAbsolutePath()).append(',');
+        sb.append("xdb_path:").append(xdbFile == null ? "null" : xdbFile.getAbsolutePath()).append(',');
         sb.append("header:").append(header.toString()).append(',');
         if (vIndex == null) {
             sb.append("v_index: null, ");
diff --git a/binding/java/src/main/java/org/lionsoul/ip2region/xdb/Searcher.java b/binding/java/src/main/java/org/lionsoul/ip2region/xdb/Searcher.java
index 8111c8e..98b8475 100644
--- a/binding/java/src/main/java/org/lionsoul/ip2region/xdb/Searcher.java
+++ b/binding/java/src/main/java/org/lionsoul/ip2region/xdb/Searcher.java
@@ -189,7 +189,7 @@ public class Searcher {
         return String.format(
             "%s->{version:%s, xdb:%s, vIndex:%s, cBuffer:%s}", 
             super.toString(),
-            version.name, xdbFile.getAbsolutePath(), 
+            version.name, xdbFile == null ? "null" : xdbFile.getAbsolutePath(), 
             vectorIndex == null ? "null" : String.valueOf(vectorIndex.length),
             contentBuff == null ? "null" : String.valueOf(contentBuff.length())
         );