diff --git a/binding/java/src/main/java/org/lionsoul/ip2region/service/ConfigBuilder.java b/binding/java/src/main/java/org/lionsoul/ip2region/service/ConfigBuilder.java
index 06dd6d6..53fca20 100644
--- a/binding/java/src/main/java/org/lionsoul/ip2region/service/ConfigBuilder.java
+++ b/binding/java/src/main/java/org/lionsoul/ip2region/service/ConfigBuilder.java
@@ -31,6 +31,9 @@ public class ConfigBuilder {
     private File xdbFile = null;
     private InputStream xdbInputStream = null;
 
+    // slice bytes for in-memory xdb content
+    private int cacheSliceBytes = Searcher.MAX_WRITE_BYTES;
+
     // searchers
     private int searchers = 20;
 
@@ -60,6 +63,11 @@ public class ConfigBuilder {
         return this;
     }
 
+    public ConfigBuilder setCacheSliceBytes(int cacheSliceBytes) {
+        this.cacheSliceBytes = cacheSliceBytes;
+        return this;
+    }
+
     public ConfigBuilder setSearchers(int searchers) {
         this.searchers = searchers;
         return this;
@@ -74,7 +82,7 @@ public class ConfigBuilder {
             throw new InvalidConfigException("SetXdbInputStream could ONLY be used with cachePolicy = Config.BufferCache");
         } else {
             // 1, load the content buffer
-            final LongByteArray cBuffer = Searcher.loadContentFromInputStream(xdbInputStream);
+            final LongByteArray cBuffer = Searcher.loadContentFromInputStream(xdbInputStream, cacheSliceBytes);
 
             // 2, verify the xdb from the buffer
             Searcher.verify(Searcher.loadHeaderFromBuffer(cBuffer), cBuffer.length());
@@ -108,7 +116,7 @@ public class ConfigBuilder {
         final byte[] vIndex = cachePolicy == Config.VIndexCache ? Searcher.loadVectorIndex(raf) : null;
 
         // 4, check and load the content buffer
-        final LongByteArray cBuffer = cachePolicy == Config.BufferCache ? Searcher.loadContent(raf) : null;
+        final LongByteArray cBuffer = cachePolicy == Config.BufferCache ? Searcher.loadContent(raf, cacheSliceBytes) : null;
 
         raf.close();
         return new Config(cachePolicy, ipVersion, xdbFile, header, vIndex, cBuffer, searchers);
diff --git a/binding/java/src/test/java/org/lionsoul/ip2region/service/ConfigTest.java b/binding/java/src/test/java/org/lionsoul/ip2region/service/ConfigTest.java
index ef26581..56e284f 100644
--- a/binding/java/src/test/java/org/lionsoul/ip2region/service/ConfigTest.java
+++ b/binding/java/src/test/java/org/lionsoul/ip2region/service/ConfigTest.java
@@ -49,39 +49,61 @@ public class ConfigTest {
             .setXdbInputStream(new FileInputStream(getDataPath("ip2region_v4.xdb")))
             .setSearchers(20)
             .asV4();
-        log.debugf("builded config: %s", v4Config);
+        log.debugf("builded config: buffs.size=%d, %s", v4Config.cBuffer.size(), v4Config);
+    }
+
+    @Test
+    public void testBuildV4SliceBytes() throws IOException, XdbException, InvalidConfigException {
+        final Config v4Config = Config.custom()
+            .setCachePolicy(Config.FullCache)
+            .setCacheSliceBytes(1024 * 1024)  // 1MiB
+            .setXdbPath(getDataPath("ip2region_v4.xdb"))
+            .setSearchers(20)
+            .asV4();
+        log.debugf("builded config: buffs.size=%d, %s", v4Config.cBuffer.size(), v4Config);
     }
 
     // --- IPv6
 
     @Test
     public void testBuildV6Config() throws IOException, XdbException, InvalidConfigException {
-        final Config v4Config = Config.custom()
+        final Config v6Config = Config.custom()
             .setCachePolicy(Config.VIndexCache)
             .setXdbPath(getDataPath("ip2region_v6.xdb"))
             .setSearchers(20)
             .asV6();
-        log.debugf("builded config: %s", v4Config);
+        log.debugf("builded config: %s", v6Config);
     }
 
     @Test
     public void testBuildV6ConfigFromFile() throws IOException, XdbException, InvalidConfigException {
-        final Config v4Config = Config.custom()
+        final Config v6Config = Config.custom()
             .setCachePolicy(Config.BufferCache)
             .setXdbFile(new File(getDataPath("ip2region_v6.xdb")))
             .setSearchers(20)
             .asV6();
-        log.debugf("builded config: %s", v4Config);
+        log.debugf("builded config: %s", v6Config);
     }
 
     @Test
     public void testBuildV6ConfigFromInputStream() throws IOException, XdbException, InvalidConfigException {
-        final Config v4Config = Config.custom()
+        final Config v6Config = Config.custom()
             .setCachePolicy(Config.BufferCache)
             .setXdbInputStream(new FileInputStream(getDataPath("ip2region_v6.xdb")))
             .setSearchers(20)
             .asV6();
-        log.debugf("builded config: %s", v4Config);
+        log.debugf("builded config: buffs.size=%d, %s", v6Config.cBuffer.size(), v6Config);
+    }
+
+    @Test
+    public void testBuildV6SliceBytes() throws IOException, XdbException, InvalidConfigException {
+        final Config v6Config = Config.custom()
+            .setCachePolicy(Config.BufferCache)
+            .setCacheSliceBytes(1024 * 1024 * 4)    // 4 MiB
+            .setXdbInputStream(new FileInputStream(getDataPath("ip2region_v6.xdb")))
+            .setSearchers(20)
+            .asV6();
+        log.debugf("builded config: buffs.size=%d, %s", v6Config.cBuffer.size(), v6Config);
     }
 
 }