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JAVA QUESTIONS

Android Broadcastreceiver for other apps install/delete not working
Android Broadcastreceiver for other apps install/delete not working
it helps some times You are trying to listen to broadcasts like ACTION_PACKAGE_ADDED and ACTION_PACKAGE_REPLACED. That is fine for Android 7.1 and lower. On Android 8.0+, you cannot register for those broadcasts in the manifest, as most implicit broa
TAG : java
Date : January 12 2021, 09:11 PM , By : KL.
Android Studio onClick not working in BindViewHolder
Android Studio onClick not working in BindViewHolder
it helps some times Great thanks to @Mike M. who rapidly answer in the comment below the question. I paste the message:When you call setOnClickListener() on itemView, it's setting that on the , since that's the outermost View there. The nested within
TAG : java
Date : January 12 2021, 09:11 PM , By : user134570
How to use Spring Converter for some controllers only?
How to use Spring Converter for some controllers only?
Hope that helps Normally speaking, a registered Converter is bound to an input source and an output destination. In your case . The default Spring converter you used will apply the conversion on each matching source-destination pair. To gain more con
TAG : java
Date : January 12 2021, 09:11 PM , By : Nick Pegg
How verify that 3 numbers in sequence are equals?
How verify that 3 numbers in sequence are equals?
Does that help As the others already said, u r overshooting the boundaries of your array. You need to stop the loop 2 earlier to prevent.You possably want to use something like that:
TAG : java
Date : January 12 2021, 09:11 PM , By : Suresh S
When using .compareTo to compare dates, why doesn't it take Months into account?
When using .compareTo to compare dates, why doesn't it take Months into account?
will help you When you format it converts to String. You are formatting and comparing. Hence it is doing String comparison. Hence, the result.If you want the expected result, you must compare Date objects. I have modified your code to compare both St
TAG : java
Date : January 12 2021, 07:00 PM , By : Derek
Does the perfomance of "filter then map" and "map then filter" differ in a Stream?
Does the perfomance of "filter then map" and "map then filter" differ in a Stream?
With these it helps In this specific example, where calling Person.getName() has basically no cost at all, it doesn't matter, and you should use what you find the most readable (and filtering after could even be marginally faster, since as TJ mention
TAG : java
Date : January 12 2021, 07:00 PM , By : Robin Buitenhuis
How can I set the initial Delay after pressing the start Button to a specific time (HH:mm:ss) format
How can I set the initial Delay after pressing the start Button to a specific time (HH:mm:ss) format
this will help Using a JTextField to parse a date format doesn't sound great because the risk of a parse exception will be high. I suggest you to use another component(s), or try to find some external date/time pickers. However, nothing stops you fro
TAG : java
Date : January 12 2021, 07:00 PM , By : DonMac
How to switch between Android devices during the tests
How to switch between Android devices during the tests
it helps some times Your code is a bit of a mess. I would advice you to read more about object orientated programming with Java. Because I think it is interesting to use two devices at the same time I will try to help you and I cleaned up your code a
TAG : java
Date : January 12 2021, 07:00 PM , By : user181945
How to configure java.util.logging via properties to use standard output?
How to configure java.util.logging via properties to use standard output?
this will help Derive a new handler from java.util.logging.StreamHandler and use its fully-qualified name with a .handlers property.(If Apache Maven is used, be aware of the surefire plugin using stdout as a means of IPC with its forked children, so
TAG : java
Date : January 12 2021, 07:00 PM , By : Techspirit
How to iterate through array in order
How to iterate through array in order
I wish did fix the issue. Why can't you just use a for loop? Here is an example(notice I changed the code, now you can pass the length of lines you read from the .txt file and pass it to your myClass object):
TAG : java
Date : January 12 2021, 07:00 PM , By : meehan
Is there better way of iteration to find the evenly divisible number?
Is there better way of iteration to find the evenly divisible number?
This might help you The lowest common multiple of two numbers x and y is xy/GCD(x,y), where GCD calculates the greatest common divisor.You can implement GCD easily using Euclid's algorithm or the binary GCD algorithm: https://en.wikipedia.org/wiki/Gr
TAG : java
Date : January 12 2021, 07:00 PM , By : Angelo Giannatos
How do I avoid using if statements with a large amount of variables in java
How do I avoid using if statements with a large amount of variables in java
Any of those help I broke down the logic into something much more simple. Using an arraylist of strings you can cut down the number of if/else checks significantly.
TAG : java
Date : January 12 2021, 08:33 AM , By : Dov
Writing JUnit test cases for a Spring Boot Service Application with autowired components
Writing JUnit test cases for a Spring Boot Service Application with autowired components
Hope this helps You autowire the component under test, into the test. You are creating the component outside of the Spring Container thus it has no knowledge of that component.
TAG : java
Date : January 12 2021, 08:33 AM , By : niel
Cors for GET with Postman not showing headers
Cors for GET with Postman not showing headers
fixed the issue. Will look into that further The answer is the Origin header. The Spring MVC framework responds with access control headers when it receives a Origin header. Postman does not include a Origin header in a GET request.
TAG : java
Date : January 12 2021, 08:33 AM , By : Rik
Printing values in different column same row using APACHE POI
Printing values in different column same row using APACHE POI
Hope this helps Problem is that in your first code, line 1, you are creating the same row for each gradeList element, so you are overwritten the row created for the element 80, with the one created with the element 81, etc due to that you only have t
TAG : java
Date : January 12 2021, 08:33 AM , By : Longchao Dong
Fully decompile java6 web application
Fully decompile java6 web application
should help you out jdGui can disassemble the individual component's jar files and .class files, [...] but is there a way to turn the whole project something that can be loaded in Eclipse or IDEA and "simply" be recompiled?
TAG : java
Date : January 12 2021, 08:33 AM , By : Christopher
Passing keycloak configuration parameters in the code rather than reading from application.properties
Passing keycloak configuration parameters in the code rather than reading from application.properties
wish help you to fix your issue Similar to KeycloakSpringBootConfigResolver, your database reader class must implement KeycloakConfigResolver and should be provided as bean.
TAG : java
Date : January 12 2021, 08:33 AM , By : Hans-Inge
setDataSource() IO exception
setDataSource() IO exception
Hope that helps In case you are already requesting for Runtime Permissions try this code:
TAG : java
Date : January 12 2021, 08:33 AM , By : mux
Unexpected Output while retrieving Data from mongodb and displaying in a csv file?
Unexpected Output while retrieving Data from mongodb and displaying in a csv file?
hop of those help? The value is retained from the previous iteration. You have to initialize the userReport (UserReport userReport=new UserReport();) in the for loop or do a setInterests(null).
TAG : java
Date : January 12 2021, 08:33 AM , By : bjorngylling
Algorithm for searching a value in two arrays
Algorithm for searching a value in two arrays
Hope that helps No, the algorithm is not very efficient. While you break as soon as you find an a in A which is greater than k, you still have to test all combinations of a and b before that, giving your algorithm a complexity of O(m n), with n being
TAG : java
Date : January 12 2021, 08:33 AM , By : liquidx
How to avoid casting with generic return values?
How to avoid casting with generic return values?
it helps some times Actually you return Enum.What you want to return is the Enum value of the passed enum as argument.
TAG : java
Date : January 12 2021, 08:33 AM , By : tangsty
Java/RegEx - Negation of pattern not working
Java/RegEx - Negation of pattern not working
seems to work fine Making a pattern for a delimiter in your case is not practical, because it requires odd-even counting outside your pattern - something Java regex has hard time doing.Your string is a perfect example: a single space is a separator w
TAG : java
Date : January 12 2021, 08:33 AM , By : cynix
How to split a string to non empty words if it might include a separator like tab on first place
How to split a string to non empty words if it might include a separator like tab on first place
wish helps you You may want to trim the word in the first place, so you no longer have spaces before the first character and after the last one, and then you could start splitting.Example :
TAG : java
Date : January 12 2021, 01:40 AM , By : adrianmooreuk
Supplier<Sequence<String>> cannot be iterated more than once
Supplier<Sequence<String>> cannot be iterated more than once
should help you out Sequence type that represents lazily evaluated collections. Top-level functions for instantiating sequences and extension functions for sequences.
TAG : java
Date : January 12 2021, 01:40 AM , By : Gazza
Why there is only one thread can actually started in @PostConstruct method?
Why there is only one thread can actually started in @PostConstruct method?
Hope this helps Because you're not creating threads. Instead of that you're creating Runnable instances and then running their run method.Instead do this:
TAG : java
Date : January 12 2021, 01:40 AM , By : sam
Manage CompletionStage inside of Netty handler
Manage CompletionStage inside of Netty handler
I think the issue was by ths following , How do I best handle exceptions when calling a service that returns a CompletionStage from inside a Netty handler. , Yes what you have shown in your code should cover both correctly.
TAG : java
Date : January 12 2021, 01:40 AM , By : Anonymous
Url Problem while Developing on Localhost and deploy on Remote Virtual Server
Url Problem while Developing on Localhost and deploy on Remote Virtual Server
this will help Suggestion 1.Instead of redirecting to http://localhost:8080/myApp/some.xhtml, build the URL from a base URL (e.g. "http://localhost:8080/myApp/") and a path. Then make the base URL a configuration parameter.
TAG : java
Date : January 12 2021, 01:40 AM , By : ChaseVoid
How to identify the missing type id in Jackson error?
How to identify the missing type id in Jackson error?
This might help you UPDATE:BusinessContact class should be annotated with @JsonTypeName("business") and PersonContact class with @JsonTypeName("personal") instead of @JsonTypeName("type") because you shoud define specific type in inheritors.
TAG : java
Date : January 12 2021, 01:40 AM , By : barefootChild
android data binding error: cannot find symbol
android data binding error: cannot find symbol
will be helpful for those in need Change android.support.v7.widget.RecyclerView to androidx.recyclerview.widget.RecyclerView
TAG : java
Date : January 12 2021, 01:40 AM , By : amy
Spring Boot application with a jar dependency does not run after maven build
Spring Boot application with a jar dependency does not run after maven build
Does that help I was developing using a 32 bit jdk in eclipse project and my machine has 64 bit jdk. Notes jar only supports 32 bit. So running it in 64 bit jdk fails to load the classes from Notes jar file. Changing machine jdk also to 32 bit solved
TAG : java
Date : January 12 2021, 01:40 AM , By : 小和尚
Spring Data JPA query , filter ? search engine ? JPQL?
Spring Data JPA query , filter ? search engine ? JPQL?
help you fix your problem The simplest way to provide a dynamic search with Spring Boot is to use specifications.Enable search by specification in your repository class :
TAG : java
Date : January 12 2021, 01:40 AM , By : TomL
Why LiveData returns null in ViewModel?
Why LiveData returns null in ViewModel?
I hope this helps . Your issue is about asynchronous nature of Rest api or retrofit calls while you are trying to get response synchronously.
TAG : java
Date : January 12 2021, 01:40 AM , By : Eniac
what this line of code mean....new URLClassLoader(new URL[0],getClass().getClassLoader());
what this line of code mean....new URLClassLoader(new URL[0],getClass().getClassLoader());
seems to work fine I want to know what is purpose of new URLClassLoader(new URL[0],getClass().getClassLoader());
TAG : java
Date : January 12 2021, 01:40 AM , By : kangfoo2
Why do need to use new Random() instead of just Random Randomnum?
Why do need to use new Random() instead of just Random Randomnum?
This might help you In Java there is no implicit calling of constructors. In your example, the variable will either be non-initialized or initialized to null (such as when declaring a class field). ie:
TAG : java
Date : January 11 2021, 05:14 PM , By : Ian Badcoe
I want to access zk components from the java file
I want to access zk components from the java file
I wish this helpful for you I would highly recommend you learn ZK using MVVM binding over MVC. It has a lot more advantages. The MVVM demo might also be helpful.Your example above using MVVM would look something like:
TAG : java
Date : January 11 2021, 05:14 PM , By : nhuser
How do I cast FieldValue.serverTimestamp() to Kotlin/Java Date Class
How do I cast FieldValue.serverTimestamp() to Kotlin/Java Date Class
may help you . I want to save the date that a post was created in Firestore but I do not want to use the System time. Rather I want to use the server timestamp for accuracy sake. So I am using FieldValue.serverTimestamp() to get the server timestamp
TAG : java
Date : January 11 2021, 05:14 PM , By : Jeskl
Insertion Sort Double Array with User Input - JAVA
Insertion Sort Double Array with User Input - JAVA
I wish this help you I am tasked with making a double (or float) array in descending order with user input, using a sorting method such as insertion sort. , The problem is here:
TAG : java
Date : January 11 2021, 05:14 PM , By : brij
Creating 2 dimesional array with user input and find sum of specific columns
Creating 2 dimesional array with user input and find sum of specific columns
fixed the issue. Will look into that further Please assist with my code. There must be 3 rows and 4 columns in the array. The user must be able to enter doubles for the first 2 columns. Then I should be able to calculate the sum of each column in the
TAG : java
Date : January 11 2021, 05:14 PM , By : Morbo
can not get Advertising ID Provider in android
can not get Advertising ID Provider in android
wish of those help i want to get Advertising ID for my app, which i have no success. , Try this Code..for me working..
TAG : java
Date : January 11 2021, 05:14 PM , By : Andrew Bailey
Convert list of Objects to map of properties
Convert list of Objects to map of properties
it should still fix some issue If you don't have Section elements that have the same getCode() value :
TAG : java
Date : January 11 2021, 05:14 PM , By : yew tree
How to represent an undirected weighted graph in java
How to represent an undirected weighted graph in java
I wish did fix the issue. There are many different way to represent vertices, edges and a graph. Here is an over-simplified one:Define a directional Edge :
TAG : java
Date : January 11 2021, 05:14 PM , By : Nick
Return values as array from collection
Return values as array from collection
I hope this helps you . We have a collection of scrips : , The following query can get us the expected output:
TAG : java
Date : January 11 2021, 05:14 PM , By : Ian
ByteBuddy generic method return cast to concrete type
ByteBuddy generic method return cast to concrete type
I hope this helps you . From the type information being present, this is not possible. You can either create a generic representation of the method as a MethodDescription to make the static type compatible. As an easier solution, you can just configu
TAG : java
Date : January 11 2021, 05:14 PM , By : user183676
ImageView hides the round corners of the parent
ImageView hides the round corners of the parent
will help you You can put the ImageView inside a CardView and it should keep the corners round. I am not sure if it's the best way to go about it but it works.
TAG : java
Date : January 11 2021, 05:14 PM , By : user96271
Is there a way to find setter method by its getter method or vice versa in a class?
Is there a way to find setter method by its getter method or vice versa in a class?
wish of those help I would use Structure (Alt+7) panel with active features "Show properties" (P icon), "Autoscroll from source" and "Autoscroll to source". If you on setter, getter or field and pressed Alt+7, you will be placed on the parameter and
TAG : java
Date : January 11 2021, 05:14 PM , By : George H.
Get aggregated list of properties from list of Objects(Java 8)
Get aggregated list of properties from list of Objects(Java 8)
Does that help I have a class Division which is having a list of Section as property as below , You may do it using the flatMap operator. Here's how it looks.
TAG : java
Date : January 11 2021, 05:14 PM , By : Rohii
Unable to find a document in Mongodb where exact date match in java
Unable to find a document in Mongodb where exact date match in java
I wish this help you For ISODate it's needed to pass the Date object in BasicDBObject, not String, also timezone must be provided:
TAG : java
Date : January 11 2021, 05:14 PM , By : Karina
UsernamePasswordAuthenticationFilter skips success handler
UsernamePasswordAuthenticationFilter skips success handler
hop of those help? Spring Security will back off on a given bean configuration when you supply that bean. So, because you supplied your filter (JsonAuthenticationFilter), Spring Security expects that you'll know best how to compose it.
TAG : java
Date : January 11 2021, 05:14 PM , By : Jim Davis
Use Java filter on stream with in a stream filter
Use Java filter on stream with in a stream filter
wish helps you You can use anyMatch on the inner stream:
TAG : java
Date : January 11 2021, 05:14 PM , By : Wilfred Knigge
Default Login not successful in spring boot 2.1.7
Default Login not successful in spring boot 2.1.7
around this issue You can use inMemoryAuthentication using configureGlobal(AuthenticationManagerBuilder auth) or @Bean of UserDetailsService:
TAG : java
Date : January 11 2021, 05:14 PM , By : user183275
Adding key value pairs from a file to a Hashmap
Adding key value pairs from a file to a Hashmap
it fixes the issue First let's take a look at why your solution does not give intended result. When you split each line around the delimiter : then there may be many key value pairs. But you just consider the first key value pair while omitting the r
TAG : java
Date : January 11 2021, 03:34 PM , By : Ted Leung
Rub regex: matching a char except when after by another char
Rub regex: matching a char except when after by another char
This might help you I don't know how to retain the '.' delimiter after splitting, but I do know how to put them back. I also appears that the spaces that follow the delimiter should be removed.The following regular expression will split ensuring that
TAG : java
Date : January 11 2021, 03:34 PM , By : Doug
Convert Base64 String to String Array
Convert Base64 String to String Array
should help you out The jsondata value is JSON text. It starts with [, which means it's a JSON array.To process it, you should use a JSON parser. See How to parse JSON in Java.
TAG : java
Date : January 11 2021, 03:34 PM , By : FarmerDave
Escape Unicode Character 'POPCORN' to HTML Entity
Escape Unicode Character 'POPCORN' to HTML Entity
Hope this helps I would use CharSequence::codePoints to get an IntStream of the code points and map them to strings, and then collect them, concatenating to a single string:
TAG : java
Date : January 11 2021, 03:34 PM , By : Vorinowsky
An empty JSON field which is a boolean/nullable field in Java model, is getting converted as null
An empty JSON field which is a boolean/nullable field in Java model, is getting converted as null
Does that help You need to disable MapperFeature.ALLOW_COERCION_OF_SCALARS feature which allows coercion in cases like you have. See below example:
TAG : java
Date : January 11 2021, 03:34 PM , By : Malikul
Mongo java driver cannot find public constructor for interface
Mongo java driver cannot find public constructor for interface
should help you out The example provided in the link works perfectly fine. Much credit goes to that user for this answer.You have probably inserted the records when FilterInterface was a class or before using the discriminators.
TAG : java
Date : January 11 2021, 03:34 PM , By : Kiltec
How to unit test writing a file to AWS Lambda output stream?
How to unit test writing a file to AWS Lambda output stream?
With these it helps Instead of mocking the OutputStream, you can create a ByteArrayOutputStream. It's basically just an array of bytes that implements OutputStream. And then you can verify the correct content was written with ByteArrayOutputSteamtoBy
TAG : java
Date : January 11 2021, 03:34 PM , By : haver
How to make a GitHub GraphQL API Call from Java
How to make a GitHub GraphQL API Call from Java
may help you . While "javax.net.ssl.SSLException: Received fatal alert: protocol_version" explains that Java 1.6 and 1.7 default is obsoleted TLS1.0, it does not do so in the context of https://api.github.com.Since February 2017, GitHub has discontin
TAG : java
Date : January 11 2021, 03:34 PM , By : Jim Davis
What's the difference between @ComponentScan and @Bean in a context configuration?
What's the difference between @ComponentScan and @Bean in a context configuration?
Any of those help It is because @ContextHierarchy will create multiple spring contexts with parent children hierarchy. In your case, TestSecurityContext defines the bean configuration for the parent context while UserInfoServiceTest.Config defines fo
TAG : java
Date : January 11 2021, 03:34 PM , By : Daljit Dhadwal
Expected class or package adding a view using a class
Expected class or package adding a view using a class
around this issue layo should be layout and LayoutParams constants need to be accessible.
TAG : java
Date : January 11 2021, 03:32 PM , By : Fred Morrison

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