src/de/steamwar/ImplementationProvider.java

@@ -28,7 +28,7 @@ public class ImplementationProvider {
         try {
             return (T) Class.forName(className).getDeclaredConstructor().newInstance();
         } catch (InstantiationException | IllegalAccessException | InvocationTargetException | NoSuchMethodException | ClassNotFoundException e) {
-            throw new SecurityException("Could not load SQLConfigProviderImpl", e);
+            throw new SecurityException("Could not load implementation", e);
         }
     }
 }

src/de/steamwar/sql/Statement.java

@@ -64,11 +64,12 @@ public class Statement implements AutoCloseable {
             Connection connection;
 
             try {
+                Class.forName("org.sqlite.JDBC");
                 connection = DriverManager.getConnection("jdbc:sqlite:standalone.db");
-            } catch (SQLException e) {
+                //TODO schema
+            } catch (SQLException | ClassNotFoundException e) {
                 throw new SecurityException("Could not create sqlite connection", e);
             }
-            //TODO ensure schema
 
             conProvider = () -> connection;
         }
@@ -117,14 +118,17 @@ public class Statement implements AutoCloseable {
         try {
             result = tryWithConnection(connection, runnable, objects);
         } catch (SQLException e) {
-            closeConnection(connection);
-            connection = aquireConnection();
             try {
-                result = tryWithConnection(connection, runnable, objects);
+                if(connection.isClosed() || !connection.isValid(1)) {
+                    closeConnection(connection);
+                    return withConnection(runnable, objects);
+                }
             } catch (SQLException ex) {
                 closeConnection(connection);
-                throw new SecurityException("Could not execute statement", ex);
+                throw new SecurityException("Could not test connection validity", ex);
             }
+
+            throw new SecurityException("Failing sql statement", e);
         }
 
         synchronized (connections) {