diff --git a/src/wrapper/java/book.cpp b/src/wrapper/java/book.cpp
index 9f7df5b73..2d555f3b7 100644
--- a/src/wrapper/java/book.cpp
+++ b/src/wrapper/java/book.cpp
@@ -39,6 +39,16 @@ Java_org_kiwix_kiwixlib_Book_dispose(JNIEnv* env, jobject thisObj)
 
 #define BOOK (getPtr<kiwix::Book>(env, thisObj))
 
+METHOD(void, Book, update__Lorg_kiwix_kiwixlib_Book_2, jobject otherBook)
+{
+  BOOK->update(*getPtr<kiwix::Book>(env, otherBook));
+}
+
+METHOD(void, Book, update__Lorg_kiwix_kiwixlib_JNIKiwixReader_2, jobject reader)
+{
+  BOOK->update(**Handle<kiwix::Reader>::getHandle(env, reader));
+}
+
 #define GETTER(retType, name) JNIEXPORT retType JNICALL \
 Java_org_kiwix_kiwixlib_Book_##name (JNIEnv* env, jobject thisObj) \
 { \
@@ -68,7 +78,7 @@ GETTER(jstring, getFaviconUrl)
 GETTER(jstring, getFaviconMimeType)
 
 METHOD(jstring, Book, getTagStr, jstring tagName) try {
-  auto cRet = Book->getTagStr(jni2c(tagName, env));
+  auto cRet = BOOK->getTagStr(jni2c(tagName, env));
   return c2jni(cRet, env);
 } catch(...) {
   return c2jni<std::string>("", env);
diff --git a/src/wrapper/java/org/kiwix/kiwixlib/Book.java b/src/wrapper/java/org/kiwix/kiwixlib/Book.java
index 3f00956a9..c40cd1670 100644
--- a/src/wrapper/java/org/kiwix/kiwixlib/Book.java
+++ b/src/wrapper/java/org/kiwix/kiwixlib/Book.java
@@ -5,6 +5,10 @@ public class Book
 {
   public Book() { allocate(); }
 
+
+  public native void update(Book book);
+  public native void update(JNIKiwixReader reader);
+
   @Override
   protected void finalize() { dispose();  }