springboot | springboot整合数据服务层的一些框架,如SpringDataJpa | Object-Relational Mapping library

 by   lixianguo5097 Java Version: Current License: No License

kandi X-RAY | springboot Summary

kandi X-RAY | springboot Summary

springboot is a Java library typically used in Utilities, Object-Relational Mapping, Spring Boot, Spring, Swagger, JPA applications. springboot has no bugs, it has build file available and it has low support. However springboot has 1 vulnerabilities. You can download it from GitHub.

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.

            kandi-support Support

              springboot has a low active ecosystem.
              It has 28 star(s) with 50 fork(s). There are 3 watchers for this library.
              It had no major release in the last 6 months.
              springboot has no issues reported. There are 3 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of springboot is current.

            kandi-Quality Quality

              springboot has no bugs reported.

            kandi-Security Security

              springboot has 1 vulnerability issues reported (1 critical, 0 high, 0 medium, 0 low).

            kandi-License License

              springboot does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              springboot releases are not available. You will need to build from source code and install.
              Build file is available. You can build the component from source.

            Top functions reviewed by kandi - BETA

            kandi has reviewed springboot and discovered the below as its top functions. This is intended to give you an instant insight into springboot implemented functionality, and help decide if they suit your requirements.
            • 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
            Get all kandi verified functions for this library.

            springboot Key Features

            No Key Features are available at this moment for springboot.

            springboot Examples and Code Snippets

            No Code Snippets are available at this moment for springboot.

            Community Discussions


            Consumer to trigger api based on the messages sent by producer
            Asked 2021-Jun-15 at 09:14

            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?



            Answered 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 RestTemplate

            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.

            Source https://stackoverflow.com/questions/67974840


            How in WebFlux to stop publisher when request is aborted by client?
            Asked 2021-Jun-15 at 09:06

            SpringBoot v2.5.1

            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?



            Answered 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 Subscription.

            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 cancel() signal...

            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 onCancel handler.

            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 onCancel handler:

            Source https://stackoverflow.com/questions/67974308


            Is it possible to send a application.properties file in arguments through a Jar file?
            Asked 2021-Jun-14 at 13:12

            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



            Answered 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:

            Source https://stackoverflow.com/questions/67970809


            How to check whether an app in Docker container ignores Java memory options?
            Asked 2021-Jun-14 at 11:21

            There is a Java 11 (SpringBoot 2.5.1) application with simple workflow:

            1. Upload archives (as multipart files with size 50-100 Mb each)
            2. Unpack them in memory
            3. 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.




            Answered 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.

            Source https://stackoverflow.com/questions/67953508


            How to get embedded Redis metrics?
            Asked 2021-Jun-14 at 08:47

            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 API?

            PS: I have used Redisson as client to perform cache operations with redis.




            Answered 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.

            1. install command line interface
              npm install -g redis-cli
            2. connect to redis running locally(cmd: rdcli -h host -p port -a password )
              rdcli -h localhost
            3. use any redis commands
              localhost:6379> info memory
              used_memory:4384744 used_memory_human:4.18M

            Ref: "Installing and running Node.js redis-cli" section of this post https://redislabs.com/blog/get-redis-cli-without-installing-redis-server

            Source https://stackoverflow.com/questions/66951854


            How to inject custom Http client to Spring Cloud openfeign?
            Asked 2021-Jun-14 at 03:22

            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:

            1. I'm using SpringBootApp


            Answered 2021-Jun-09 at 05:01

            You need to put @Configuration on top of FeignConfig which should make it work I believe.

            Source https://stackoverflow.com/questions/67896483


            SpringBoot 2.5.0 For Jackson Kotlin classes support please add "com.fasterxml.jackson.module: jackson-module-kotlin" to the classpath
            Asked 2021-Jun-14 at 02:37

            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?



            Answered 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.

            Source https://stackoverflow.com/questions/67630048


            E2E Tests With SpringBoot Backend and Angular Frontend
            Asked 2021-Jun-13 at 16:53

            I am working on an application which has 2 modules.

            1. server module which is SpringBoot.
            2. 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.



            Answered 2021-Jun-13 at 16:53

            The issue was not with the modules. There were 2 issues,

            1. I was using an older version of Chrome driver for running the tests.
            2. 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.


            Source https://stackoverflow.com/questions/67601905


            No property .. found for type .. in spring boot
            Asked 2021-Jun-13 at 07:11

            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:



            Answered 2021-Jun-13 at 06:30

            Since,This is a query on nested Object. You need to update your query as this.

            Source https://stackoverflow.com/questions/67953825


            How to configure multiple database-platforms in spring boot
            Asked 2021-Jun-12 at 23:21

            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.



            Answered 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:

            Source https://stackoverflow.com/questions/67839078

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install springboot

            You can download it from GitHub.
            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 .


            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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