kandi X-RAY | spring Summary
kandi X-RAY | spring Summary
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I am just curious does batch listener mode in Spring Kafka gives better performance than non-batch listener mode? If we are handling exceptions then we still need to process each record in Batch-listener mode. Non-batch seems less error prone, stable and customizable .
Please share your views on this as I didn't find any good comparison....
ANSWERAnswered 2021-Jun-15 at 20:19
It completely depends on what your listener is doing with the data.
If it processes each record in a loop then there is no benefit; you might as well just let the container iterate over the collection and send the listener one record at-a-time.
Batch mode will improve performance if you are processing the batch as a whole - e.g. a batch insert using JDBC in a single transaction.
This will often run much faster than storing one record at-a-time (using a new transaction for each record) because it requires fewer round trips to the DB server.
So I initialized CAS using
cas-initializr with the following command inside the
ANSWERAnswered 2021-Jun-15 at 18:37
Starting with 6.4 RC5 (which is the version you run as of this writing and should provide this in your original post):
The collection of thymeleaf user interface template pages are no longer found in the context root of the web application resources. Instead, they are organized and grouped into logical folders for each feature category. For example, the pages that deal with login or logout functionality can now be found inside login or logout directories. The page names themselves remain unchecked. You should always cross-check the template locations with the CAS WAR Overlay and use the tooling provided by the build to locate or fetch the templates from the CAS web application context.
Please read the release notes and adjust your setup.
All templates are listed here: https://apereo.github.io/cas/development/ux/User-Interface-Customization-Views.html#templates
I am querying a database for an item using R2DBC and Spring Integration. I want to extend the transaction boundary a bit to include a handler - if the handler fails I want to roll back the database operation. But I'm having difficulty even establishing transactionality explicitly in my integration flow. The flow is defined as...
ANSWERAnswered 2021-Jun-15 at 18:32
Well, it's indeed not possible that declarative way since we don't have hook for injecting to the reactive type in the middle on that level.
Try to look into a
TransactionalOperator and its usage from the Java DSL's
I have a Spring Boot app with a Kafka Listener implementing the BatchAcknowledgingMessageListener interface. When I receive what should be a single message from the topic, it's actually one message for each line in the original message, and I can't cast the message to a ConsumerRecord.
The code producing the record looks like this:...
ANSWERAnswered 2021-Jun-15 at 17:48
You are missing the listener type configuration so the default conversion service sees you want a list and splits the string by commas.
I am trying to figure out is there any way to send failed records in Dead Letter topic in Spring Boot Kafka in Batch mode. I don't want to make the records being sent in duplicate as it's consuming in batch and few are already processed. I saw this link ofspring-kafka consumer batch error handling with spring boot version 2.3.7
I thought about a use case to stop container and start again without using DLT but again the issue of duplication will come in Batch mode.
@Garry Russel can you please provide a small code for batch error handling....
ANSWERAnswered 2021-Jun-15 at 17:34
RetryingBatchErrorHandler was added in spring-kafka version 2.5 (which comes with Boot 2.3).
The listener must throw an exception to indicate which record in the batch failed (either the complete record, or the index in the list).
Offsets for the records before the failed one are committed and the failed record can be retried and/or sent to the dead letter topic.
There is a small example there.
RetryingBatchErrorHandler was added in 2.3.7, but it sends the entire batch to the dead letter topic, which is typically not what you want (hence we added the
I am using class based projection with constructor expressions. here is a sample code form my work...
ANSWERAnswered 2021-Jun-15 at 00:02
try using left join
Hey to all in the forum
I use JSF Mojarra implementation, version JSF 2.2
I need desperately a help on this.
- I have a snippet of my page.
- I have a custom component "example_result.xhtml" used in the page.
- I have my BackingBean.java Be aware please that this code is not the real code I made. If you run it, it will be very ugly maybe because I deleted all the css classes and I kept only the hot stuff I need to show you my problem.
Everything is inside 1 form.
The 5 "h:selectManyCheckbox" (in my code I have 8 or 9)
In the form I have 5 "h:selectManyCheckbox" which are using values in the "value" attribute for different cases (javaFrameworks2Values, javaFrameworks3Values,...), and the "f:selectItems" use arrays of "SelectItem" (javaFrameworksSelectItems2, javaFrameworksSelectItems3...) created for these different cases, just to make some examples for me to understand how all the selectOne and selectMany components work. The ideas for this, about different cases were taken from these links: "https://stackoverflow.com/tags/selectonemenu/info" and "https://mkyong.com/jsf2/jsf-2-checkboxes-example".
After I have 2 commandButtons
1 for submit, and 1 for reset the values.
Display the values
After I display the results of the values of the "h:selectManyCheckbox" via the "example_result.xhtml".
You can see the 4th "h:selectManyCheckbox" that is the only one different, because it has the attribute "required" with the attribute "requiredMessage". With it there is a "h:message" to display the validation error.
In the BackingBean (which is Spring Bean, but it works perfectly good - sorry I don't want ejbs 3.x), I have initialized:
- The values of the SelectItems and
- The values of the "value" attribute, where the values of the "h:selectManyCheckbox" will be stored to be displayed later. [The code is completely castrated, to make it readable snippet].
When the page is rendered, I select checkBoxes (e.g. the 2 last, because the 2 first are initials) from all the "h:selectManyCheckbox". When I say that select from all, I mean it. And from the 4th with the "required" attribute. I try in the buttons (see in the code) the "Effort 1", or "Effort 2", or "Effort 3" (in the "f:ajax" in the buttons) and the result outputs in the last part are displayed and updated like a candy. Without any problem. To achive this with the composite component I googled and tried a lot. But I made it.
Then it comes the time to try the 4th to see the validation error of the "required" attribute.
I select again from all as before, but not from all. NOT from the 4th "h:selectManyCheckbox" this time. I select nothing from the 4th "h:selectManyCheckbox" to ckeck the validator error message ("requiredMessage"). The result is: It displays the message of error (GOOD until now), BUT this time it does not update anything from the others "h:selectManyCheckbox" to the output results at the end, and it does not reset the values as well as it was doing before (when I selected from all and from the 4th as well).
I understand that it says: as long as in the form the 4th failed with validation error, all the other "h:selectManyCheckbox" will not update the output results (something like wanting to fail all the others too).
But what really happes here?
- It does not give the values to the "h:selectManyCheckbox", to be updated to the output?
- It gives the vales to the "h:selectManyCheckbox" normally, BUT it just not updates the output?
The other efforts in the "f:ajax" in the buttons, are just efforts maybe to solve the problem but in these cases they don't even display the error message in the 4th case and of cource they don't update the other output results as well (again). But no message error as well.
I don't know if the problem is clear to you. I can explain in the discussion better so I can clarify the situation better. [To be honnet it took me 1 and half hour to write all this thing]
Thanks a lot in advance
========== Snippet from my page ==========...
ANSWERAnswered 2021-Jun-15 at 14:11
After a lot of discussing with the only person who wanted to help to my issue here (and I thank him @WoAiNii for this a lot), I decided to post my solution:
I will make 5 different forms with 5 set of buttons (submit/reset), to make escalate this problem, for 5 so much related components in the form.
But my question is open: Why this is happening, what rule in JSF in this case is taking place and makes this situation. Anyone, comes with an explanation:
- Thomas: this is a rule in JSF, or
- is a JSF bug, or
- this happens in these cases, or... whatever...,
I will be glad to read it here so I will learn better, and others to will learn from these ideas of yours. Thanks a lot
I am trying to use JOOQ code generation from JPA Entity. I have already created a dedicated maven module where the code will be generated which has dependency on a module containing all entities as well code generation plugin with of jooq.
To add more clarify on project structure, here are the modules:(The names are made up but the structure reflects the current project i am working on)...
ANSWERAnswered 2021-Jun-02 at 07:53
I'm assuming you have missing dependencies on your code generation class path. Once you update your question, I'll update my answer.Regarding jOOQ code generation support for
jOOQ won't support your generated composite types in generated code out of the box, you'll still have to add forced type configurations for that, possibly embeddable type configurations:
Note that the
JPADatabase offers a quick win by integrating with simple JPA defined schemas very quickly. It has its caveats. For best results, I recommend going DDL first (and generate both jOOQ code and JPA model from that), because it will be much easier to put your schema change management under version control, e.g. via Flyway or Liquibase.
I am trying to build a cinema app with flutter. The structure is as follows:
- in each city there are a bunch of cinemas
- in a cinema there are a bunch of showrooms(salle in french)
- in a showroom(salle in french) there are five display sessions or projections, these projections are of the same film.
because the projections are of the same movie (a showroom displays the same movie in different time(e.g projections) by design), when I click on any of the projections in a showroom I should have the same posture of the same film, not a different posture in each projection.
However I get a different film posture in each projection, and I don't know what is causing this.
I am using a rest api that I created with Spring, and I am certain that the problem is not from my back-end because I am using it in an angular web app and it's working perfectly.
this is what happened when I click on two projection of the same showroom( notice that the posture changes when it shouldn't.
and here is the code of the showroom page (salles-page.dart)...
ANSWERAnswered 2021-Jun-15 at 11:53
Problem related to back-end and have nothing to do with Flutter.
I've an model:
User(id, firstName, lastName);
I get the user from
POST request in Java Spring boot framework using
@ModelAttribute Annotation in the prototype.
ANSWERAnswered 2021-Jun-15 at 11:36
When you use the Spring Framework, there is a serialization/deserialization happening "behind the scenes" which involves your POJOs.
For example, into this endpoint:
No vulnerabilities reported
You can use spring like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the spring component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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