logo
down
shadow

JAVA QUESTIONS

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
can be delete of a element in a static array be O(1)?
can be delete of a element in a static array be O(1)?
fixed the issue. Will look into that further Not exactly. The length of an array in Java is fixed. You can still delete objects at the end of the array by keeping a separate counter for the number of items in the array. Then you can "delete" the last
TAG : java
Date : January 11 2021, 03:32 PM , By : kennystone
Instance variable heap or stack ? ( with specific example)
Instance variable heap or stack ? ( with specific example)
Does that help It means that the objectB field of objectA no longer references anything. If the object (on the heap) it was referencing before is not referenced anywhere else (and it isn't in the code you posted), it will be garbage collected. This m
TAG : java
Date : January 11 2021, 03:32 PM , By : Jody Bannon
Assert progress of ProgressBar in Espresso test
Assert progress of ProgressBar in Espresso test
should help you out It would seem Espresso does not allow to check the progress attribute using a ViewInteraction. Although, it is possible to recover the progress bar view directly from the view and to assert its value using assertThat.
TAG : java
Date : January 11 2021, 03:32 PM , By : ganok_tor
How to detect if gson.fromjson() has excess elements
How to detect if gson.fromjson() has excess elements
wish helps you One thing you could do is to deserialize the incoming JSON, then serialize it again and check if the result matches your incoming JSON:
TAG : java
Date : January 11 2021, 03:32 PM , By : avi
I cant generate the proper code to select the a specific filter on a BI dashboard I am working on
I cant generate the proper code to select the a specific filter on a BI dashboard I am working on
hop of those help? I cant generate the proper code to select the specific filter on a BI dashboard I am working on. , Try using xpath the bellow :
TAG : java
Date : January 11 2021, 03:28 PM , By : jaset
How to Inject Dependencies into a Servlet Filter with Spring Boot Filter Registration Bean?
How to Inject Dependencies into a Servlet Filter with Spring Boot Filter Registration Bean?
This might help you If you create an object by yourself, using new, and this object is not returned by a @Bean-annotated method, then it's not a Spring bean, and Spring will thus not inject anything in it. You can just add an @Bean-annotated method r
TAG : java
Date : January 11 2021, 03:28 PM , By : Puneet Madaan
Thrift types as a Generic
Thrift types as a Generic
I wish this helpful for you I'm using Apache thrift which generates Java classes that look like this: , If it's only a container, you can use star-projection:
TAG : java
Date : January 11 2021, 03:28 PM , By : ck1
Effective algorithm to random 4 unique integers less than a big max such as 100_000
Effective algorithm to random 4 unique integers less than a big max such as 100_000
it helps some times If I understand correctly, you want to have an array of 4 distinct random integers between 1 and 100_000 (inclusive).Here's a concise end expressive way of doing that
TAG : java
Date : January 11 2021, 03:28 PM , By : woxorz
Combining or and negation in Java regex?
Combining or and negation in Java regex?
I hope this helps you . I am trying to combine the usage of "not" and "or" to produce a set of regex matching like so: , For first 2 conditions you may use:
TAG : java
Date : January 11 2021, 03:28 PM , By : ranja
Unable to instantiate default tuplizer Exception
Unable to instantiate default tuplizer Exception
around this issue I googled for a solution and unfortunately most of the answers that solved for others dint help me.A couple of the most voted answers is mentioning below: Use of javaassist.jar and make sure when you use its compatible with your hib
TAG : java
Date : January 11 2021, 03:26 PM , By : Pepe Araya
Multi-tenant migration to work with quarkus
Multi-tenant migration to work with quarkus
Hope this helps Right now we don't support setting up Hibernate ORM multitenancy with the Quarkus application.properties so you should go the persistence.xml way.That being said, we might consider supporting it in the future if there is enough tracti
TAG : java
Date : January 11 2021, 03:26 PM , By : s8k
Ignite persisting a Set: Cannot find metadata for object with compact footer
Ignite persisting a Set: Cannot find metadata for object with compact footer
With these it helps It looks like IGNITE_HOME directory refers to a volume/folder that is cleared on restarts. Please set that variable to a path that is not changed over restarts the way you did for the storage and WAL.
TAG : java
Date : January 11 2021, 03:26 PM , By : snapshooter
Maven cannot resolve Jacob dependency using eclipse
Maven cannot resolve Jacob dependency using eclipse
seems to work fine This dependency is located in the JBoss Third Party Repository: https://mvnrepository.com/repos/jboss-thirdparty-releasesTo resolve this just add to your list of repositories in your pom.xml:
TAG : java
Date : January 11 2021, 03:26 PM , By : ralph okochu
testcontainers oracle database container starts before database user is created
testcontainers oracle database container starts before database user is created
Hope that helps I solved this problem by creating a script (actually two, but can be put into one) that checks if the database user "XYZ" exists and returns 0 if it does.wait_check.sh:
TAG : java
Date : January 11 2021, 03:26 PM , By : koder
Launching two spring boot apps in integration test
Launching two spring boot apps in integration test
wish helps you Here are two suggestions that may help depending on your situation:
TAG : java
Date : January 11 2021, 03:26 PM , By : user157064
Is there a way to add a HashMap's value that is a integer array into a ArrayList?
Is there a way to add a HashMap's value that is a integer array into a ArrayList?
seems to work fine You may use directly List as value of your map to get it easily and put it directly into the result List :
TAG : java
Date : January 11 2021, 03:26 PM , By : user183825
Is there any way that I can get a parameter in paintComponent?
Is there any way that I can get a parameter in paintComponent?
wish help you to fix your issue As you can see in the Javadoc, there is only one defined method for paintComponent in JComponent. This means that there is not a way that you can do this, without creating your own JComponent and extensions (subclasses
TAG : java
Date : January 11 2021, 03:26 PM , By : user104292
Empty stack with one recursive method and one iterative method
Empty stack with one recursive method and one iterative method
Hope this helps This a question from an old test I am practicing on. , This is pretty simple. Just replace the contents of your method with:
TAG : java
Date : January 11 2021, 03:26 PM , By : Jojo
What's the behavior of onBackpressureBuffer in RxJava2
What's the behavior of onBackpressureBuffer in RxJava2
it fixes the issue I am using the below code and it always prints 9999 in the end. It first prints consecutive numbers ( till 127) and then 9999. Maybe in your case the main executing thread end much earlier than the threads processing the print numb
TAG : java
Date : January 11 2021, 03:26 PM , By : LUK
Java regex can only use 1 quantifier in a lookback (need 2)
Java regex can only use 1 quantifier in a lookback (need 2)
around this issue I can't use more then 1 quantifier in a lookback. , Have you tried with replaceFirst()?
TAG : java
Date : January 11 2021, 03:26 PM , By : oiyto
How to fix error in native query : it is showing syntax error near or at
How to fix error in native query : it is showing syntax error near or at
will be helpful for those in need I have a table name group having fields id , name etc. but i only want to fetch id and name so for this i made a separate (data transfer object).
TAG : java
Date : January 11 2021, 02:18 PM , By : Brian
How to retrieve nested object from a document and display it in FirestoreRecyclerOptions?
How to retrieve nested object from a document and display it in FirestoreRecyclerOptions?
Any of those help There is no way you can get those addresses using a query. FirestoreRecyclerOptions object require a Query or a CollectionReference to be passed to the setQuery() method when you need to get all documents within a collection or when
TAG : java
Date : January 11 2021, 02:18 PM , By : Denis Chaykovskiy
Why not use ListIterator for full LinkedList Operation?
Why not use ListIterator for full LinkedList Operation?
This might help you A ListIterator can indeed efficiently remove the node on which it is positioned. You can thus create a ListIterator, use next() two times to move the cursor, and then remove the node instantly. But evidently you did a lot of work
TAG : java
Date : January 11 2021, 02:18 PM , By : Star Gryphon
Android Webview EvaluateJavascript sometimes does not return a response
Android Webview EvaluateJavascript sometimes does not return a response
wish helps you I did eventually figure out what happened here. The shorter version is, this can happen when you have a memory leak and an object that is utilizing a semi-destroyed webview will fire off commands, but the newly-initialized webview will
TAG : java
Date : January 11 2021, 02:18 PM , By : eastcoastj
Matcher java doesn't work but regex seems to be good
Matcher java doesn't work but regex seems to be good
I wish this helpful for you I want to find instance of regex in my string. But it doesn't work. My regex seems to be good. , Your are missing MULTILINE mode in your Java regex, you may use:
TAG : java
Date : January 11 2021, 02:18 PM , By : rhinojosa
Finding dimensions of a .gif file
Finding dimensions of a .gif file
This might help you Since you already have an ImageIcon instance, you can simply use its getIconHeight() and getIconWidth() methods to get these values:
TAG : java
Date : January 11 2021, 02:18 PM , By : Shane
Java Number format how to change +/- sign to custom text
Java Number format how to change +/- sign to custom text
To fix this issue You can do this in your format string for DecimalFormat:
TAG : java
Date : January 11 2021, 11:39 AM , By : Suresh S
Entity partially saved when using JOINED inheritance strategy and setting spring.jpa.properties.hibernate.jdbc.batch_siz
Entity partially saved when using JOINED inheritance strategy and setting spring.jpa.properties.hibernate.jdbc.batch_siz
hope this fix your issue Problem fixed. I just needed to use the latest version of Hibernate.I updated my pom.xml as follows:
TAG : java
Date : January 11 2021, 11:39 AM , By : Yohan Lee
Stored Procedure in Java Spring Boot Project returns null as Output
Stored Procedure in Java Spring Boot Project returns null as Output
Hope that helps After hours of trying I found a way to make it work.First I add @NamedStoredProcedureQuery to my CompanyResource entity class:
TAG : java
Date : January 11 2021, 11:39 AM , By : Matt Logan
How to solve org.hibernate.MappingException which is causing due to inheriting a class
How to solve org.hibernate.MappingException which is causing due to inheriting a class
I hope this helps you . It doesn't have much to do with inheritance. Read the error message. It says the Hibernate doesn't know how to map the property dao of type PlanroomMigrationDAO of your entity. This property shouldn't exist in the first place:
TAG : java
Date : January 11 2021, 11:39 AM , By : niel
Clean Archtecture. Understanding of scheme
Clean Archtecture. Understanding of scheme
I hope this helps . Picture 1: License, PersonalLicense, BusinessLicense is ok, Billing must be like that:
TAG : java
Date : January 11 2021, 11:39 AM , By : John Bentley
Processing 3 triangle not showing in Javafx 8 Window tab
Processing 3 triangle not showing in Javafx 8 Window tab
Any of those help JavaFX has an "event thread" that is responsible for updating the GUI, responding to button clicks, etc (i.e. any GUI operation).If you try to update the GUI in any way on a thread other than the JavaFX event thread, you will get th
TAG : java
Date : January 11 2021, 11:39 AM , By : pcoramc

shadow
Privacy Policy - Terms - Contact Us © scrbit.com