diff --git a/binding/java/pom.xml b/binding/java/pom.xml
index 43fe239..09481a1 100644
--- a/binding/java/pom.xml
+++ b/binding/java/pom.xml
@@ -4,7 +4,7 @@
 
     <groupId>org.lionsoul</groupId>
     <artifactId>ip2region</artifactId>
-    <version>2.7.0</version>
+    <version>2.8.0</version>
     <packaging>jar</packaging>
 
     <name>ip2region</name>
diff --git a/binding/java/src/main/java/org/lionsoul/ip2region/SearchTest.java b/binding/java/src/main/java/org/lionsoul/ip2region/SearchTest.java
index 735f8aa..23d48e1 100644
--- a/binding/java/src/main/java/org/lionsoul/ip2region/SearchTest.java
+++ b/binding/java/src/main/java/org/lionsoul/ip2region/SearchTest.java
@@ -67,7 +67,7 @@ public class SearchTest {
             }
         }
 
-        if (dbPath.length() < 1) {
+        if (dbPath.isEmpty()) {
             System.out.print("java -jar ip2region-{version}.jar search [command options]\n");
             System.out.print("options:\n");
             System.out.print(" --db string              ip2region binary xdb file path\n");
@@ -95,7 +95,6 @@ public class SearchTest {
                 long cost = TimeUnit.NANOSECONDS.toMicros((long) (System.nanoTime() - sTime));
                 System.out.printf("{region: %s, ioCount: %d, took: %d μs}\n", region, searcher.getIOCount(), cost);
             } catch (Exception e) {
-                e.printStackTrace();
                 System.out.printf("{err: %s, ioCount: %d}\n", e, searcher.getIOCount());
             }
         }
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 2a77b88..f06da2c 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
@@ -127,7 +127,7 @@ public class Searcher {
         }
 
         // empty match interception
-        System.out.printf("dataLen: %d, dataPtr: %d\n", dataLen, dataPtr);
+        // System.out.printf("dataLen: %d, dataPtr: %d\n", dataLen, dataPtr);
         if (dataPtr < 0) {
             return null;
         }