diff --git a/demo/java/.gitignore b/demo/java/.gitignore
index dc7bdeb..34500c4 100644
--- a/demo/java/.gitignore
+++ b/demo/java/.gitignore
@@ -20,4 +20,6 @@
 *.rar
 
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
-hs_err_pid*
\ No newline at end of file
+hs_err_pid*
+
+!lib/**
\ No newline at end of file
diff --git a/demo/java/lib/jackson-annotations-2.9.8.jar b/demo/java/lib/jackson-annotations-2.9.8.jar
new file mode 100644
index 0000000..4d9f421
Binary files /dev/null and b/demo/java/lib/jackson-annotations-2.9.8.jar differ
diff --git a/demo/java/lib/jackson-core-2.9.8.jar b/demo/java/lib/jackson-core-2.9.8.jar
new file mode 100644
index 0000000..362f1f3
Binary files /dev/null and b/demo/java/lib/jackson-core-2.9.8.jar differ
diff --git a/demo/java/lib/jackson-databind-2.9.8.jar b/demo/java/lib/jackson-databind-2.9.8.jar
new file mode 100644
index 0000000..2d8687b
Binary files /dev/null and b/demo/java/lib/jackson-databind-2.9.8.jar differ