diff --git a/main/example/00_empty/Makefile b/main/example/00_empty/Makefile
index 7bba09d02fb0b9e46b100a4916c8ae8cfc0a0264..6bdfcde406d66b06f8d22941cc3017bf07d75bfa 100644
--- a/main/example/00_empty/Makefile
+++ b/main/example/00_empty/Makefile
@@ -6,6 +6,7 @@ TARGET := sample
 CXXFLAGS += -ggdb -DLOG_MODULE_ID='"demo"'
 LDFLAGS += -L.. \
 	-ltbox_main \
+	-ltbox_log \
 	-ltbox_terminal \
 	-ltbox_network \
 	-ltbox_eventx \
diff --git a/main/example/01_one_app/Makefile b/main/example/01_one_app/Makefile
index 6f476699763ef37019bacc34bf3f34ed896c4813..577137db66bfca1b12eb2c8ad68a02438d6afc5d 100644
--- a/main/example/01_one_app/Makefile
+++ b/main/example/01_one_app/Makefile
@@ -6,6 +6,7 @@ TARGET := sample
 CXXFLAGS += -ggdb -DLOG_MODULE_ID='"demo"'
 LDFLAGS += -L.. \
 	-ltbox_main \
+	-ltbox_log \
 	-ltbox_terminal \
 	-ltbox_network \
 	-ltbox_eventx \
diff --git a/main/example/02_more_than_one_apps/Makefile b/main/example/02_more_than_one_apps/Makefile
index e40bc7857987f3c811a0434c1250e8c5dbbaa647..92b8ff5af6fa254db2d3c33cf4689f85e3bb3a54 100644
--- a/main/example/02_more_than_one_apps/Makefile
+++ b/main/example/02_more_than_one_apps/Makefile
@@ -12,6 +12,7 @@ include app3/app.mk
 CXXFLAGS += -ggdb -DLOG_MODULE_ID='"demo"'
 LDFLAGS += -L.. \
 	-ltbox_main \
+	-ltbox_log \
 	-ltbox_terminal \
 	-ltbox_network \
 	-ltbox_eventx \
diff --git a/main/example/03_nc_client_and_echo_server/Makefile b/main/example/03_nc_client_and_echo_server/Makefile
index 840f9033ab8242459afe9a06f2c3b12a63a13ce6..3b9206c5eaafeca2165a9173c454c8402f0d8eae 100644
--- a/main/example/03_nc_client_and_echo_server/Makefile
+++ b/main/example/03_nc_client_and_echo_server/Makefile
@@ -11,6 +11,7 @@ include echo_server/app.mk
 CXXFLAGS += -ggdb -DLOG_MODULE_ID='"demo"'
 LDFLAGS += -L.. \
 	-ltbox_main \
+	-ltbox_log \
 	-ltbox_terminal \
 	-ltbox_network \
 	-ltbox_eventx \
diff --git a/main/example/03_nc_client_and_echo_server/echo_server/app.cpp b/main/example/03_nc_client_and_echo_server/echo_server/app.cpp
index bc556e85fb746237eebd62b69fc5366bfad4706a..05591ac4c7216ee190a7300f2792377aa5e92c8c 100644
--- a/main/example/03_nc_client_and_echo_server/echo_server/app.cpp
+++ b/main/example/03_nc_client_and_echo_server/echo_server/app.cpp
@@ -31,7 +31,7 @@ bool App::onInit(const tbox::Json &cfg)
     if (!js_bind.is_string())
         return false;
 
-    if (!server_->initialize(SockAddr::FromString(js_bind.get<std::string>())))
+    if (!server_->initialize(SockAddr::FromString(js_bind.get<std::string>()), 2))
         return false;
 
     server_->setReceiveCallback(