kandi X-RAY | springboot Summary
kandi X-RAY | springboot Summary
springboot整合的框架 springboot-jpa:springboot整合SpringDataJpa，实现restful的风格增删改查 springboot-MybatisPlus:springboot整合MybatisPlus，实现restful的风格增删改查 springboot-file:springboot实现文件上传下载，阿里云OOS模块 springboot-exceptionHandler:springboot实现全局异常处理 springboot-freemarker:springboot整合freemarker模板引擎 springboot-jsp:springboot整合jsp springboot-multiDatasource:springboot整合多数据源 springboot-logs:springboot整合@Slf4j+logback输出日志,使用AOP统一处理Web请求日志,多环境配置 springboot-swagger:springboot整合swagger2 springboot-shiro:基于前后端分离的shiro权限认证,整合日志模块，拆分为与jwt/redis整合的两个模块 springboot-xss:整合防xss攻击模块 springboot-excel:整合poi以及easyExcel导入导出excel表格 springboot-kafka:整合kafka实现消息推送 springboot-elasticSearch:整合elasticSearch springboot-websocket:整合websocket前后端通信 springboot-multiDatasource2:使用MybatisPlus实现多数据源 springboot-alipay:整合支付宝电脑网页支付.
Top functions reviewed by kandi - BETA
- create Excel workbook
- Download excel sheet .
- set shiro filter .
- Encodes a byte array into a String .
- default handler resolvers
- generate by table name
- Zips the given file to the zip output stream .
- Generate file by freemarker
- get IP address from request
- form simple fill
springboot Key Features
springboot Examples and Code Snippets
Trending Discussions on springboot
I made a consumer and producer class using spring. Now I want the consumer to trigger some api based on the messages sent by producer. How to do that? Please provide solution in JAVA SpringBoot. How to trigger an api from application.yml in consumer?...
ANSWERAnswered 2021-Jun-14 at 18:39
when I add @postMapping here then it gives error
You can only add that annotation on REST server methods that handle incoming requests.
You are trying to make an outgoing HTTP call, then you need to use an HTTP Client of your choice, or a Spring
If you are trying to call any internal HTTP endpoint, then you should refactor your code to call methods of the same classes those HTTP resources interact with.
There is an endpoint requesting a long running process result and it is created somehow
(for simplicity it is
Mono.fromCallable( ... long running ... ).
Client make a request and triggers the publisher to do the work, but after several seconds client aborts the request (i.e. connection is lost). And the process still continues to utilize resources for computation of a result to throw away.
What is a mechanism of notifying Project Reactor's event loop about unnecessary work in progress that should be cancelled?...
ANSWERAnswered 2021-Jun-15 at 09:06
fromCallable doesn't shield you from blocking computation inside the
Callable, which your example demonstrates.
The primary mean of cancellation in Reactive Streams is the
cancel() signal propagated from downstream via the
Even with that, the fundamental requirement of avoiding blocking code inside reactive code still holds, because if the operators are simple enough (ie. synchronous), a blocking step could even prevent the propagation of the
A way to adapt non-reactive code while still getting notified about cancellation is
Mono.create: it exposes a
MonoSink (via a
Consumer) which can be used to push elements to downstream, and at the same time it has a
You would need to rewrite your code to eg. check an
AtomicBoolean on each iteration of the loop, and have that AtomicBoolean flipped in the sink's
I have a Springboot project and I know I can send a application.properties file as a argument, but is this possible using a jar file?
I built my jar file using maven and in my application I have this piece of code that runs the programm if the user sent the argument run.
Is there any method that allows me to set the application properties if I receive it through argument? Or does the override of the file happens automatically as it does when I use the command
mvn spring-boot:run -Dspring.config.location=your.properties
ANSWERAnswered 2021-Jun-14 at 13:12
For jar you can either pass one of the properties or the complete or its location as beow.
we can configure the location directly in the command line:
There is a Java 11 (SpringBoot 2.5.1) application with simple workflow:
- Upload archives (as multipart files with size 50-100 Mb each)
- Unpack them in memory
- Send each unpacked file as a message to a queue via JMS
When I run the app locally
java -jar app.jar its memory usage (in VisualVM) looks like a saw: high peaks (~ 400 Mb) over a stable baseline (~ 100 Mb).
When I run the same app in a Docker container memory consumption grows up to 700 Mb and higher until an OutOfMemoryError. It appears that GC does not work at all. Even when memory options are present (
java -Xms400m -Xmx400m -jar app.jar) the container seems to completely ignore them still consuming much more memory.
So the behavior in the container and in OS are dramatically different.
I tried this Docker image in
DockerDesktop Windows 10 and in
OpenShift 4.6 and got two similar pictures for the memory usage.
ANSWERAnswered 2021-Jun-13 at 03:31
In Java 11, you can find out the flags that have been passed to the JVM and the "ergonomic" ones that have been set by the JVM by adding
-XX:+PrintCommandLineFlags to the JVM options.
That should tell you if the container you are using is overriding the flags you have given.
Having said that, its is (IMO) unlikely that the container is what is overriding the parameters.
It is not unusual for a JVM to use more memory that the
-Xmx option says. The explanation is that that option only controls the size of the Java heap. A JVM consumes a lot of memory that is not part of the Java heap; e.g. the executable and native libraries, the native heap, metaspace, off-heap memory allocations, stack frames, mapped files, and so on. Depending on your application, this could easily exceed 300MB.
Secondly, OOMEs are not necessarily caused by running out of heap space. Check what the "reason" string says.
Finally, this could be a difference in your app's memory utilization in a containerized environment versus when you run it locally.
I have used Embedded Redis for caching in my springboot application. The redis runs on localhost and default
port "6379" on application start up.
Is there a way to get metrics(memory-used, keyspace_hits, keyspace_misses, etc..) for embedded redis, from outside the application, may be command line or any
PS: I have used Redisson as client to perform cache operations with redis.
ANSWERAnswered 2021-Jun-14 at 08:47
Redis has provided a command line interface :
redis-cli to interact with it and get the metrics. redis-cli can be used on embedded redis as well.
- install command line interface
npm install -g redis-cli
- connect to redis running locally(cmd: rdcli -h host -p port -a password )
rdcli -h localhost
- use any redis commands
localhost:6379> info memory
Ref: "Installing and running Node.js redis-cli" section of this post https://redislabs.com/blog/get-redis-cli-without-installing-redis-server
I'm trying to provide CloseableHttpClient to Spring Cloud OpenFeign. Spring Cloud Open Feign Documentationsays it supports CloeableHttpClient. Spring documentation doesn't give any example of actually replacing the HTTP client.
Basically, I'm providing SSLContext to the HTTP client and I want Feign to use this SSLContext loaded client. How to inject this CloseableHttpClient into the Feign?
Following is my relevant configuration:
- I'm using SpringBootApp
ANSWERAnswered 2021-Jun-09 at 05:01
You need to put
@Configuration on top of
FeignConfig which should make it work I believe.
This is now fixed with SpringBoot 2.5.1
Small question about a warning I am receiving please.
After the release of 2.5.0 of SpringBoot, I just did a version bump from 2.4.x to 2.5.0, without any code change.
Suddenly, on application start up, I am getting
kground-preinit] o.s.h.c.j.Jackson2ObjectMapperBuilder: For Jackson Kotlin classes support please add "com.fasterxml.jackson.module:jackson-module-kotlin" to the classpath
The thing is, my Springboot all is not a Kotlin app, it is a Java app.
It has nothing Kotlin.
Furthermore, I am not even doing any explicit JSON parsing.
May I ask how I can disable, resolve this warning please?...
ANSWERAnswered 2021-May-23 at 14:57
There seems to be a solution here. The idea is to provide extra configuration for
Jackson2ObjectMapperBuilderCustomizer. Sucks that a code change is required but there you have it.
I am working on an application which has 2 modules.
- server module which is SpringBoot.
- ui which is in Angular
I am unable to run any E2E tests for my application as it is not starting before the tests run. I have below defined in the test class which should bring up the application context but it seems it does not....
ANSWERAnswered 2021-Jun-13 at 16:53
The issue was not with the modules. There were 2 issues,
- I was using an older version of Chrome driver for running the tests.
- The E2E tests were trying to access the application using https but the certificates I was using were self signed certificates. To overcome this, I added the below argument to my chromeoptions.
I'm a beginner with spring and I have this little issue. "No property questionId found for type CourseTestCompleteField!" I have 2 model classes that are connected via a one to one join. That 2 model class are:...
ANSWERAnswered 2021-Jun-13 at 06:30
Since,This is a query on nested Object. You need to update your query as this.
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....
ANSWERAnswered 2021-Jun-12 at 23:21
Ok, 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:
No vulnerabilities reported
You can use springboot 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 springboot 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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