diff --git a/Library/src/main/java/com/cfive/classroom/library/database/Test.java b/Library/src/main/java/com/cfive/classroom/library/database/Test.java
deleted file mode 100644
index ea1f736..0000000
--- a/Library/src/main/java/com/cfive/classroom/library/database/Test.java
+++ /dev/null
@@ -1,7 +0,0 @@
-package com.cfive.classroom.library.database;
-
-public class Test {
-    public static void run() {
-        System.out.println("Run database test");
-    }
-}
diff --git a/Library/src/main/java/com/cfive/classroom/library/database/util/AlreadyExistsException.java b/Library/src/main/java/com/cfive/classroom/library/database/util/AlreadyExistsException.java
new file mode 100644
index 0000000..8b37f69
--- /dev/null
+++ b/Library/src/main/java/com/cfive/classroom/library/database/util/AlreadyExistsException.java
@@ -0,0 +1,7 @@
+package com.cfive.classroom.library.database.util;
+
+public class AlreadyExistsException extends Exception {
+    public AlreadyExistsException() {
+        super("This item already exists");
+    }
+}
diff --git a/Library/src/main/java/com/cfive/classroom/library/database/util/DependenciesNotFoundException.java b/Library/src/main/java/com/cfive/classroom/library/database/util/DependenciesNotFoundException.java
new file mode 100644
index 0000000..70ab93c
--- /dev/null
+++ b/Library/src/main/java/com/cfive/classroom/library/database/util/DependenciesNotFoundException.java
@@ -0,0 +1,7 @@
+package com.cfive.classroom.library.database.util;
+
+public class DependenciesNotFoundException extends Exception {
+    public DependenciesNotFoundException() {
+        super("Could not found dependencies");
+    }
+}
diff --git a/Library/src/main/java/com/cfive/classroom/library/database/util/InsertException.java b/Library/src/main/java/com/cfive/classroom/library/database/util/InsertException.java
new file mode 100644
index 0000000..f1e247a
--- /dev/null
+++ b/Library/src/main/java/com/cfive/classroom/library/database/util/InsertException.java
@@ -0,0 +1,7 @@
+package com.cfive.classroom.library.database.util;
+
+public class InsertException extends Exception {
+    public InsertException() {
+        super("Could not insert the data into database");
+    }
+}
diff --git a/Library/src/main/java/com/cfive/classroom/library/database/util/NoConfigException.java b/Library/src/main/java/com/cfive/classroom/library/database/util/NoConfigException.java
new file mode 100644
index 0000000..262520f
--- /dev/null
+++ b/Library/src/main/java/com/cfive/classroom/library/database/util/NoConfigException.java
@@ -0,0 +1,7 @@
+package com.cfive.classroom.library.database.util;
+
+public class NoConfigException extends Exception {
+    public NoConfigException() {
+        super("Could not load configuration file");
+    }
+}