exception

问题 I am using for J2Mod java jar for my project. I am connected with the device through comport but, neither able to read nor write data into the device. Both time when I am trying to read or write data into the device getting the same exception. Whenever, Using QModMaster I am able to read data from the devices. Connection Code - SerialParameters parameters; SerialConnection serialMaster; try { parameters = new SerialParameters(); parameters.setPortName((String) jComboBox4.getSelectedItem()); /

问题 This question already has answers here : Is an array name a pointer? (9 answers) Closed 2 years ago . So, in C, this perfectly works: int myArray[] = {1, 2, 3}; why does the following give me a runtime error when accessing an element? int * myArray2 = {1, 2, 3}; myArray2[0]; when myArray2[0] basically means *myArray2 , which does also not work? 回答1: I think that the fundamental difference is that declaring an array implicitly allocates memory, while declaring a pointer does not. int myArray[3

问题 I'm using the GitHub example to process the messages of a topic: private void RegisterSubscriptionClientMessageHandler() { _subscriptionClient.RegisterMessageHandler( async (message, token) => { var eventName = $"{message.Label}{INTEGRATION_EVENT_SUFIX}"; var messageData = Encoding.UTF8.GetString(message.Body); await ProcessEvent(eventName, messageData); // Complete the message so that it is not received again. await _subscriptionClient.CompleteAsync(message.SystemProperties.LockToken); },

问题 How to handle UsernameNotFoundException ? In spring security when username not found the UserDetailsService implementation throws a UsernameNotFoundException . For example like this: @Override @Transactional public UserDetails loadUserByUsername(java.lang.String username) throws UsernameNotFoundException { logger.info("Load user by username: {}", username); User user = userRepository.findUserByUsername(username).orElseThrow( () -> new UsernameNotFoundException("User Not Found with -> username

问题 How to handle UsernameNotFoundException ? In spring security when username not found the UserDetailsService implementation throws a UsernameNotFoundException . For example like this: @Override @Transactional public UserDetails loadUserByUsername(java.lang.String username) throws UsernameNotFoundException { logger.info("Load user by username: {}", username); User user = userRepository.findUserByUsername(username).orElseThrow( () -> new UsernameNotFoundException("User Not Found with -> username

问题 I am learning Flutter and I want to catch the exception that should be thrown ( as security rule is correctly rejecting it) at the Flutter Application/device. Below is the code try { FirebaseDatabase.instance.reference().once().then((DataSnapshot snapshot) { try { debugPrint(snapshot.toString()); } on DatabaseError catch (eIn1) { debugPrint(' onRoot ' + eIn1.toString()); } }); }on DatabaseError catch (eOut1) { debugPrint(' on1 ' + eOut1.toString()); } try { FirebaseDatabase.instance.reference

问题 Reading How to identify checked and unchecked exceptions in java? makes me wonder: Why is org.json.JSONException unchecked according to maven and eclipse? (no compilation error when not handled) Both are extending java.lang.Exception according to the javadoc and the source code... org.JSON.JSONArray produces no error without try/catch: For comparison, here is a checked exception example: atg.taglib.json.util.JSONArray produces an error without try/catch: atg.taglib.json.util.JSONArray

问题 Reading How to identify checked and unchecked exceptions in java? makes me wonder: Why is org.json.JSONException unchecked according to maven and eclipse? (no compilation error when not handled) Both are extending java.lang.Exception according to the javadoc and the source code... org.JSON.JSONArray produces no error without try/catch: For comparison, here is a checked exception example: atg.taglib.json.util.JSONArray produces an error without try/catch: atg.taglib.json.util.JSONArray

问题 Does anyone know how to check that an exception is raised correctly? I need something that works in Python 2.7. The below 'assert' is not quite correct method to use from the Python unittest library: assert ( a_a0_getinst.add_port("iTCK", ISC.PortType_INPUT) ), "Can't add duplicate port" The error I get is: Traceback (most recent call last): File "test_010_module.py", line 157, in runTest a_a0_addinst = a_a0.add_instance( "A00", b_a0 ) File "/nfs/sc/disks/sc_dteg_2004/users/acheung1/dteg

问题 I'm trying to figure out what's causing a Cannot perform runtime binding on a null reference error from this code: var query = "SELECT Id, UserName, List_Order, LoggedIn " + "FROM AspNetUsers" + "WHERE LoggedIn = 1" + "ORDER BY List_Order ASC"; var conn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString); var cmd = new SqlCommand(query, conn); conn.Open(); var rdr = cmd.ExecuteReader(); var n = 0; while(rdr.Read()) { if