All Questions
Tagged with error-handling java
156 questions
1
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1
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199
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3
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2
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239
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1
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1
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495
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Reading files and displaying their content
I'm writing a program to read two files supplied as arguments in the command line, convert them from list to char[][], and display their contents to the user.
I'm trying to practice exception-...
- 53
3
votes
1
answer
428
views
Varnish - HttpClient Exception Handling
I'm consuming some messages from a rabbit queue. Within the consumer/processor I need to invalidate a varnish cache and requeue the message if the purge failed.
I'm using a local purge proxy.
The ...
- 131
5
votes
1
answer
271
views
Transferring data from one file stream to another
I am currently reading Clean Code and for fun and profit, I intended to refactor some of the Java Tutorials and since I wanted to improve my Exception handling, the Byte Stream one with its lots of ...
- 728
3
votes
1
answer
660
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Using a Boolean method that never returns "false" to check user permissions
I need to check that a user is allowed to save/retrieve contacts to/from the database by calling a web service, and return an HTTP403 with an explanation if it is not the case.
So for the sake of ...
- 143
2
votes
1
answer
1k
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Retrieving access token from SharedPreference
Here is code that retrieves an access token from SharedPreference.
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2
votes
2
answers
220
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RSS to JSON for insertion into MongoDB
In my code, there is a chain of functions call where the deepest function may throw an exception. I catch and handle it according to the business logic. The problem is that all other functions in the ...
- 277
1
vote
1
answer
139
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Recording a customer's shopping cart as an order 2.0
Some days ago, I put up a question here for review about the best way to handle JDBC transactions in the context of an e-commerce Java web application.
After a kind suggestion from user @gardenhead, ...
- 145
2
votes
2
answers
279
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Recording a customer's shopping cart as an order
I have come up with the following method to post a transaction to a database, in the context of an e-commerce Java web application. The transaction consists in submitting a new order alongside its ...
- 145
7
votes
2
answers
301
views
Querying Facebook for details of a user's OAuth token
This class exposes the public method getAuthToken which takes a user's Facebook OAuth token as an input parameter and queries Facebook for information about it - ...
- 73
6
votes
2
answers
5k
views
Single class which holds response and error message
I am working on a library which will make HTTP call to my rest service basis on inputs passed to this library. And whatever response comes back from service whether it is successful response or ...
- 1,947
3
votes
0
answers
369
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Stylishly saving source
Simple tool to save a web page's source. A result of trying to learn and apply an MVC approach. The FXML is generated via Scene Builder, but included for completion.
I welcome any general feedback on ...
- 9,839
3
votes
1
answer
3k
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Retry Runnable java
I want to make class to retry doing what I want if specific exception happen for n times before throwing exception, so I write below class and used Builder to build it could you please review it and ...
4
votes
2
answers
94
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Delay to avoid cocurrent modification
I was attempting to remove items from an ArrayList while iterating through it, only to find out that Java doesn't like that. So I quickly wrote up a ...
- 718
33
votes
6
answers
4k
views
Unbreakable average program
I'm creating a program that averages four numbers - three from a file and one from user input. Simple enough. But the catch is, the professor is going to be deliberately trying to break the program.
...
- 433
5
votes
1
answer
6k
views
Layered architecture implementation in a Java web application
I am trying to learn how to design and implement a layered Java web application with a presentation layer, service layer and the DAO layer. I have used the Struts 1.3 framework with Java JDK 1.6 for ...
- 151
6
votes
2
answers
1k
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Servlet file uploader
I think this code looks ugly, especially with the multiple try-catch blocks, but I don't know how to rewrite it:
...
- 583
4
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2
answers
262
views
4
votes
2
answers
94
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Printing gitignores
I have written a simple program in Java 7 to write the .gitignore of different file types:
...
- 5,127
0
votes
1
answer
1k
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JUnit test case to check that an exception of type javax.mail.MessagingException is not thrown
I have a method which will send a text mail using JavaMail API and I am trying to write a test case for this method which will check if an Exception of type ...
3
votes
1
answer
1k
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Catch all checked exceptions and turn into unchecked exception
I am currently trying to learn Lambdas and following the book Java SE8 for the really Impatient and just finished Chapter 1 of it. This is the question, I am trying to get done with:
Didn’t you ...
- 501
5
votes
1
answer
6k
views
Handling an invalid SQL query exception
This is my DAO object that takes the Cypher query as a string, and returns a JSON representation of the graph it returns.
Because it's using a Spring JdbcTemplate ...
- 1,298
3
votes
1
answer
22k
views
Checking for Internet connectivity on Android
I wrote this code to check an internet connection and was wondering if this is the best way to do this check.
...
- 517
7
votes
1
answer
787
views
Proper checked exception handling with lambda functions
I'm having trouble finding a clean way to handle checked exceptions thrown by a lambda function passed as a parameter in Java.
I'm writing a Client which will interact via RMI with a Server to play a ...
- 203
5
votes
5
answers
4k
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Map error messages to conditions
I have a method which checks some preconditions and if everything is fine returns a success response object, otherwise fail with ...
- 225
5
votes
2
answers
16k
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IO and Scanner exception handling
I have created a sample file reading program as an exercise while learning how to implement good exception handling. I want to ask: is this a good approach or is there some other solution that I am ...
- 567
0
votes
1
answer
267
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Asking for a number in Java Swing
Is it good way of asking for a number? Should that function return 0 if there is an error?
...
- 117
3
votes
1
answer
3k
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Functionality for automatic retry after exception
I have made the following system to automatically retry network calls if some exception is thrown. (Earlier posted on stackOverFlow, solution inspired by what @Boris answered)
...
- 415
4
votes
1
answer
196
views
String find and replace method optimization
I am trying to find a specific header string from different Maps (LEDES1998Bheaders, LEDES98BIheaders and ...
- 747
7
votes
1
answer
337
views
Calling other machines from the LinkedList if one is blocked or down
This is a follow on to : Simplifying asynchronous "executeAsync" method along with "onFailure" callback.
I am using AsyncRestTemplate as my <...
- 1,947
8
votes
3
answers
2k
views
Simplifying asynchronous "executeAsync" method along with "onFailure" callback
I have a system in which user id is "sharded" across all the machines which means each machine is responsible for certain user id data. I am working on a library which will take ...
- 1,947
2
votes
1
answer
264
views
Logging of various exceptions in the callback
I am working on a library in which I need to execute my URL using AsyncRestTemplate and after that I will get a json response back if it is successful. I am also making ...
- 1,947
3
votes
1
answer
49
views
Deciding whether an anchor should be updated
A colleague and I were discussing the following code today and had a disagreement over the return false in the ...
0
votes
2
answers
123
views
Searching for an account by accountId
I have a piece of code that is fetching account objects from a service
...
1
vote
1
answer
114
views
Logging errors with the same exception type
I wrote some code which simply retrieves the HTTP status code of the passed in URL. There are multiple potential causes of the same error. I am hoping to get some all around feedback on this code, ...
- 524
4
votes
2
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283
views
Verifying value before parsing
I am writing some Java code and am coming across a try/catch block in which I decided to verify the value is not null before parsing it:
...
- 275
-2
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1
answer
957
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Retrying to read a file [closed]
I have a piece code which retries 3 more times to open a file (see below). Are there potential problems or side effects with the way it is written? How can it be improved? Also, why would one use <...
- 7
3
votes
1
answer
398
views
Servlet responses to upload/download requests
My task is to write a program to store files in object store. One of the subtasks requires to send json or xml format response to the file uploader/downloader as requested by client.
The following ...
- 131
9
votes
3
answers
457
views
Exception handling and general check in Java
Are the catch statements ok or must I put in a println()? In general, is the code good-looking enough?
...
0
votes
2
answers
23k
views
Extract data from database and write them to file
I wanted to write a program that performed a query to a database, then formatted the data before writing it to a file.
I thus created 4 classes, which are:
a main class
a class dealing with the ...
- 313
4
votes
0
answers
629
views
Exception logger for servlets and JSPs
I hate using unnecessary catch blocks and I like to see my code look beautiful. In most of the cases in my project, which is a web application, I can't declare many ...
- 277
4
votes
1
answer
170
views
Do you view this ThrowingFunction interface as "interface abuse"?
I am currently implementing a fun project involving lambdas and this project makes heavy use of the ability of Java 8 to have default methods in interfaces.
But when does such "heavy use" turn into ...
- 1,733
4
votes
2
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11k
views
Multi threaded TCP server
I wrote this just for fun, to hone my exception handling skills. I want to know what I can do better in terms of exception handling (and otherwise) in the below code
Server
...
- 51
6
votes
5
answers
9k
views
Java Stream Exception Handling
I find this piece of Java code really ugly and cumbersome. How can I refactor it to be more clean and easier to read?
...
- 95
5
votes
1
answer
6k
views
AsyncTask which allows to handle exceptions on UI
The AsyncTask available in android, gives you the result from doInBackground on the UI thread so that you can update UI ...
- 431
1
vote
2
answers
7k
views
Servlet and JSP for user registration, with CAPTCHA and error handling
I have a form that submits to a registration Servlet, which inserts a new user to the database when they sign up to the web application. Depending on the erroneous user input, the Servlet will ...
- 478
3
votes
2
answers
74k
views
Class design for a student class
Problem Statement:
Design a STUDENT class to store roll, name, course, admission date and
marks in 5 subjects taken from user. Create an array of STUDENT
objects. Provide methods ...
- 453
4
votes
1
answer
2k
views
Error Handling in Servlets and JSPs
I have an HTML login form that is processed by a servlet, which then redirects the user to a result page.
login.jsp:
...
- 478
5
votes
3
answers
5k
views
User registration Servlet
I have a servlet that processes user registration to a website. It takes inputs from an HTML form like username, password, email, etc.
MySQL Table:
...
- 478