kandi X-RAY | Springboot- Summary
kandi X-RAY | Springboot- Summary
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Top functions reviewed by kandi - BETA
- Gets the jdbc template
- The datasource bean
- The master data source
- Slave data source
- Change data source
- Set datasource
- Delete by primay key
- Gets the id
- Called after a data source has been cut
- Delete User
- The application starts
- Clear datasource
- Determines the current lookup key
- Select all users
- Get all users
Springboot- Key Features
Springboot- Examples and Code Snippets
Community Discussions
Trending Discussions on Springboot-
QUESTION
I have got a Spring Boot project with two data sources, one DB2 and one Postgres. I configured that, but have a problem:
The auto-detection for the database type does not work on the DB2 (in any project) unless I specify the database dialect using spring.jpa.database-platform = org.hibernate.dialect.DB2390Dialect.
But how do I specify that for only one of the database connections? Or how do I specify the other one independently?
Additional info to give you more info on my project structure: I seperated the databases roughly according to this tutorial, although I do not use the ChainedTransactionManager: https://medium.com/preplaced/distributed-transaction-management-for-multiple-databases-with-springboot-jpa-and-hibernate-cde4e1b298e4 I use the same basic project structure and almost unchanged configuration files.
...ANSWER
Answered 2021-Jun-12 at 23:21Ok, I found the answer myself and want to post it for the case that anyone else has the same question.
The answer lies in the config file for each database, i.e. the DB2Config.java file mentioned in the tutorial mentioned in the question.
While I'm at it, I'll inadvertedly also answer the question "how do I manipulate any of the spring.jpa properties for several databases independently".
In the example, the following method gets called:
QUESTION
I have created a docker image ( java web application ), created a kubernetes cluster with 1 master and 1 worker, created a deployment and a service. All the resources seem to run fine as I have checked by 'kubectl describe resource resourcename'. At last, I used Ingress in order to expose the services outside the cluster. The ingress resource seems to work fine as there are no errors while describing the ingress object. However, on accessing the host on a browser from another machine , I get "Your connection is not private" error. I am pretty new to Kubernetes and I am unable to debug the cause of this.
Below are service/deployment yaml files, ingress file contents and the status of resources.
Service and Deployment YAML:
...ANSWER
Answered 2021-May-05 at 11:59you got the error due to "Your connection is not private" due to your ingress don't have the SSL/TLS certificate and you tried maybe accessing the domain name over HTTPS.
QUESTION
According to Camel Context starter one can use these:
...ANSWER
Answered 2021-Apr-27 at 08:08If you check out Maven Central for both starter definition you will see that the org.apache.camel is used prior to Camel 3 while org.apache.camel.springboot is used since Camel 3 and onwards.
As such, depending on your Camel version you use, you either should use org.apache.camel in case you are stuck with Camel 2.x or org.apache.camel.springboot for Camel 3.x+
QUESTION
I have one container of springboot application on docker,and one container of postgres with all the settings.How can I run both of them by linking them together. The image springboot-postgresql corresponds to spring boot application,and postgres refers to postgresql. Postgres is listening to 0.0.0.0,port 5432.
Please suggest,if there's another way other than making a .yml file and using docker compose up .
Thanks for the help.
ANSWER
Answered 2021-Apr-22 at 20:39The way you can communicate between each container is using docker network,
First, you need to create a network:
QUESTION
I have a Spring Project in which I am using Maven to manage my dependencies. I have some (5 to 10) packages mentioned inside the POM-File and Maven is successfully downloading them into my local repository.
But IntelliJ is not recognizing these packages. Not even the SpringBoot-Packages.
I have tried different things:
- Delete local Maven-Repository
- Create a new Project inside IntelliJ from existing Sources but with the same Directory as the original Project
- Create a new Project inside IntelliJ from existing Sources but I have copied the
src-Folder and the POM-File to a new Directory first
Why is IntelliJ not recognizing the Maven-Dependencies?
P.S.: The Maven-Build is successful. So Maven IS recognizing the packages inside the repository.
...ANSWER
Answered 2021-Jan-11 at 10:30Just open maven pom.xml as project instead of creating new project from sources
QUESTION
I am building an application using spring-boot microservices and deploying into the docker container. I am using docker-compose mechanism to deploy the services into the containers.
- My docker setup is on Windows-10 Home Edition.
- WSL2 setting is also enabled.
I am using:
- AdoptOpenJDK 11.0.10+9
- Spring boot 2.4.2
- Docker desktop Engine 20.10.5
- Compose 1.29.0
When I am going to deploy the applications into the container using docker-compose up command, I have below error in one of the service while deployment.
Resource exhaustion event: the JVM was unable to allocate memory from the heap.
And prints some data.
I have modified the docker settings of WSL2 and allocate more memory to it from 4GB to 8GB but still it failing.
While analysis of logs I found one thing:
The services which are deployed are not taking the memory as mentioned in the docker-compose file. Here are the logs and file:
Logs:
...ANSWER
Answered 2021-Apr-20 at 04:17I am able to solve it.
The problem is like I mentioned in my question. While at the time of startup each service takes lot of memory (see the logs in the question section), so there is no memory remaining for rest of the services and because of that rest of the service failed while starting with the message related to memory.
The changes I made to the docker-compse.yml file and those are:
QUESTION
I am learning ho to test Spring Boot Kafka application with TestContainers. The test passes. However, in the beginning there are a lot of such messages:
...ANSWER
Answered 2021-Apr-12 at 15:43I had the same problem, solved creating and application-test.yml with:
QUESTION
I have an example SpringBoot app in Kotlin and WebFlux. I divided whole application into modules (as I'm used to from asp.net).
Modules:
- core (models, DTO, helpers, etc...) referenced everywhere
- data (repositories, tables...) referenced only in business
- business (services, handlers...) referenced in api
- api actual SpringBoot application
My problem now is how to properly work with ReactiveCrudRepository<> and repositories in general. I have config class in data module to enable R2dbcRepositories.
...ANSWER
Answered 2021-Mar-30 at 22:20Adding the same set of dependencies to each subproject may feel odd, but it's totally fine to do. In order to use a given dependency in a given subproject, you'll have to specify it as a dependency for that subproject.
There are, however, neater ways to accomplish this than actually copy-pasting the import statement to each build file. I would suggest specifying a subprojects section in your root build.gradle.kts and putting shared & common dependencies there:
QUESTION
I have a classic Spring Boot Application connected to a MySQL database.
Can I use r2dbc driver and spring data r2dbc to develop another application that listens to the database changes like a change data capture?
I've studied the r2dbc driver documentation, but I don't understand if they produces reactive hot streams or only cold streams. If it is not possible I believe that I should use Debezium, like I found in this article.
Thanks a lot
...ANSWER
Answered 2021-Mar-23 at 11:15R2DBC is primarily a specification to enable reactive/non-blocking communication with your database. What an R2DBC driver is capable of pretty much depends on your database.
The Longer VersionR2DBC specifies a set of interfaces including methods where every database conversation is activated through a Publisher. R2DBC has no opinion on the underlying wire protocol. Instead, a database driver implementing R2DBC has to stick to its database communication protocol. What you get through JDBC or ODBC is pretty much the same as what you can expect from an R2DBC driver.
There are smaller differences: some JDBC drivers require polling for data (such as Postgres Pub/Sub notification) whereas, in R2DBC, a notification stream can be consumed without a polling thread as all I/O is based on listening on the receive buffers and emitting data once the driver receives data. In contrast, JDBC (and pretty much all imperative API) require someone to call a method to consume/obtain data.
I'm not sure how CDC works with MySQL; I think you need to scan (poll) the BINLOG using MySQL commands or the MySQL protocol. Right now, the R2DBC MySQL driver doesn't support BINLOG polling.
Postgres has similar functionality (Logical Decode). It is supported by R2DBC Postgres (see the documentation of Logical Decode using R2DBC Postgres). In Postgres, the server pushes the replication log to the client, which gives you a hot stream as logical decode subscribes to the replication log.
The gist is pretty much that it depends on the actual database technology.
QUESTION
I've implemented a feign client that calls a get API based on this official repository. I have a rule class UserValidationRule that needs to call that get API call getUser() and validate some stuff. That works as expected but when I get to testing that rule class, mocking the feign client is not successful and it continues to call the actual API. I've simplified the situation so please ignore the simplicity lol. This is a follow up question I have after i found this stackoverflow question
The API returns this model:
...ANSWER
Answered 2021-Mar-22 at 17:25You are not using the spring managed UserServiceClient bean. Every time you call UserValidationRule.validate it calls validateUser which in turn calls the getServiceClient method. This getServiceClient creates a new instance of UserServiceClient for each invocation. This means when testing the mocked UserServiceClient is not in use at all.
I would restructure the code as below;
First either declare UserServiceClient as final with @RequiredArgsConstructor or replace @RequiredArgsConstructor with @AllArgsConstructor. The purpose of this change is to allow an instance of UserServiceClient be injected rather than creating internally in the service method.
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