Fix connection timeout

src/main/App/Database/Hibernate.java

@@ -17,6 +17,8 @@ public class Hibernate {
             Persistence.createEntityManagerFactory("Database", getProperties());
     private static EntityManager em = ENTITY_MANAGER_FACTORY.createEntityManager();
 
+    private Hibernate(){throw new IllegalStateException("Utility class");}
+
     /**
      * Sets up the password and username to the database
      * @return a map with the password and username
@@ -238,12 +240,17 @@ public class Hibernate {
     }
 
     /**
-     * Gets entity manager
+     * Gets entity manager or makes a new one if the connection is not open anymore
      *
      * @return the entity manager
      */
     public static EntityManager getEm() {
+        if(!em.isOpen()) {
+            em.close();
+            em = ENTITY_MANAGER_FACTORY.createEntityManager();
+        }
         return em;
+
     }
 
     /**

src/main/resources/META-INF/persistence.xml

@@ -14,7 +14,7 @@
                 <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
                 <property name="hibernate.connection.driver_class" value="com.mysql.cj.jdbc.Driver"/>
                 <property name="hibernate.connection.url" value="jdbc:mysql://mysql-ait.stud.idi.ntnu.no:3306/olafros"/>
-                <property name="hibernate.connection.pool_size" value="5"/>
+                <property name="hibernate.connection.pool_size" value="1"/>
             </properties>
         </persistence-unit>
 </persistence>
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