kandi X-RAY | spring-framework Summary
kandi X-RAY | spring-framework Summary
This is the home of the Spring Framework, the foundation for all Spring projects. Together the Spring Framework and the family of Spring projects make up what we call "Spring". Spring provides everything you need beyond the Java language to create enterprise applications in a wide range of scenarios and architectures. Please read the Overview section in the reference for a more complete introduction.
Top functions reviewed by kandi - BETA
- Reads the bytecode instructions .
- Compares two objects .
- Instantiate the bean using the factory method .
- Puts this method information into the given byte vector .
- Attempts to reconcile the declared parameters .
- Searches for the given element .
- Emits a list of methods .
- Attempt to match a given pattern .
- Process the scheduled task .
- Merges the given block into this block .
spring-framework Key Features
spring-framework Examples and Code Snippets
Trending Discussions on spring-framework
I am implementing a backend service with Spring Boot. This service receives a REST request and executes some database operations and finally updates the status of the record.
After that, I would like to start a new async process and execute another data manipulation on the same record this way:...
ANSWERAnswered 2021-Jun-13 at 21:11
It is NOT GUARANTEED that "the 1st,
classA.doSomething() method will always finish and commit the transaction before the 2nd
classB.complete() async call check the status of the same record".
Transactions are implemented as some kind of interceptors appropriate for the framework (this is true for CDI too). The method marked
@Transactional is intercepted by the framework, so the transaction will not end before the closing
} of the method. As a matter of fact, if the transaction was started by another method higher in the stack, it will end even later.
ClassB has plenty of time to run and see inconsistent state.
I would place the 1st part of
doSomething in a separate REQUIRES_NEW transaction method (you may need to place it in a different class, depending on how you configured transaction interceptors; if you are using AOP, Spring may be able to intercept calls to methods of the same object, otherwise it relies on the injected proxy object to do the interception and calling a method through
this will not activate the interceptor; again this is true for other frameworks as well, like CDI and EJB). The method
doSomething calls the 1st part method, which finishes in a new transaction, then
ClassB can continue asynchronously.
Now, in that case (as correctly pointed out in the comment), there is a chance that the 1st transaction succeeds and the 2nd fails. If this is the case, you will have to put logic in the system about how to compensate for this inconsistent state. Frameworks cannot deal with it because there is not one recipe, it is a per case "treatment". Some thoughts, in case they help: make sure that the state of the system after the 1st transaction clearly says that the second transaction should complete "shortly after". E.g. keep a "1st tx committed at" field; a scheduled task can check this timestamp and take action if it is too far in the past. JMS gives you all this - you get retries and a dead letter queue for the failed cases.
This is a question about the default behavior of Spring. Say I have a singleton bean called BeanA, which has a constructor dependency to a singleton bean called BeanB. BeanB will have to be created before BeanA in order to satisfy that dependency. If both beans implement the DisposableBean interface I would expect the destroy method to be called in the reverse order that the beans were created in, but I can't see it mentioned in the documentation. The best I've found is the documentation for the DependsOn annotation (https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/context/annotation/DependsOn.html) but it doesn't mention what the behavior is when DependsOn isn't used.
Edit: As I mentioned in a comment below: I've tried this out and in my test it works as expected. BeanA is destroyed before BeanB. I would like some documentation or similar to know that this is always the case though....
ANSWERAnswered 2021-Jun-11 at 07:25
After testing and looking through the Spring source code (for example the DefaultSingletonBeanRegistry mentioned by M. Deinum in a comment) I have found that two singleton beans where one is dependendent on the other will indeed be destroyed in the reverse order they are created in. When thinking about it I have a hard time seeing how it could work in another way. If the beans were not destroyed in the reverse order it would cause a lot of problems. For example, during the shutdown of an app a bean could try to use another bean that has already been destroyed. Unfortunately, I still haven't found any confirmation of the behavior in the documentation.
We are using Spring 4.3.5 in our application. While we try to uplift the Spring to 5.3.7, we are not able to initialize beans(inside "beanRefFactory.xml") inside the below tag-...
ANSWERAnswered 2021-Jun-08 at 18:20
I solved this by creating a custom class BeanFactoryContextLoader.java which extends ContextLoaderListener.
I'm following the docs of spring framework and trying to realize it by code, but I'm stuck on AppConfig class. What dependency do I need to import AppConfig class? I've injected spring-beans, spring-web, spring-context, spring-webmvc already and my spring version is 5.2.5.RELEASE.
I googled "AppConfig cannot be resolved to a type" but couldn't get anything about it.
And this is the part of code from https://docs.spring.io/spring-framework/docs/current/reference/html/web.html#spring-web...
ANSWERAnswered 2021-Jun-08 at 16:04
You need to create the
Configuration bean first named AppConfig .
Some thing like below:
is there a way to perform insertion of an
@Id-column value into a non
@Id column when entity is being created/updated to avoid double-
ANSWERAnswered 2021-Jun-08 at 11:59
@GeneratorType allows to generate/set values into entity during insertion phase. Suppose your entity looks like this:
I'm trying to write a generic function to do some Webflux operations and I'm getting a class cast exception that I can't figure out...
ANSWERAnswered 2021-Jun-05 at 18:24
This works so you're probably not getting a
ViewModel back from your webClient body but rather the
map of parameters (or something) from the
WebsocketHandler as it was shown in the Webflux websocket doc.
ANSWERAnswered 2021-May-27 at 08:30
After some research I found that, this can be solved with the Flux itself. It is enough that we add
startWith method to the
Flux. As in the definition of the
Prepend the given values before this Flux sequence.
So we prepend our
Hello message to the start of the
Flux and it will be published first.
I am trying to get my head around the Spring
ActiveMQ documentation recommends when using
JmsTemplate that a Spring
CachingConnectionFactory or an ActiveMQ
PooledConnectionFactory is used as the connection factory implementation.
I understand this because using the normal
ConnectionFactory a connection is created, a session started, and both are closed for EVERY call of the
jmsTemplate.send() which is very wasteful.
So I am trying to implement a custom
JmsTemplate bean with a
CachingConnectionFactory for use where I may have many requests that are A) Persisted to DB B) Enqueued JMS.
ANSWERAnswered 2021-May-24 at 16:17
JmsTemplate reliably closes its resources after each operation (returning the session to the cache), including
That comment is related to user code using sessions directly; the close operation is intercepted and used to return the session to the cache, instead of actually closing it. You MUST call close, otherwise the session will be orphaned.
Yes, the transaction will roll back (immediately) if its
sessionTransacted is true.
You should NOT call commit - the template will do that when execute exits normally (if it is
Often I work on Spring Boot Java applications (built with Gradle or Maven) that make network calls to external services (e.g. to external REST-like APIs). When running automated (JUnit) tests, I do not want these calls to happen, even by accident. Calling a real endpoint (even a "dev" environment one designed for testing) could affect external state, cause needless server workload, or unintentionally reveal information to the endpoint. It might also cause the test to inadvertently depend on that external resource being up, leading to build failures if the resource ever goes down while building the project, or when building the project offline.
What should typically happen with these calls is that they should either be mocked out to do nothing or should point to a service on the same machine (e.g. a WireMock endpoint on localhost spun up by the test, or a local Docker container spun up by the test using Testcontainers).
What I tend to in these situations is create a test-specific bean definition profile that overrides all HTTP endpoints with something obviously bogus that is guaranteed not to route somewhere, e.g.
http://example.invalid/bookSearch. That way, if a developer misses mocking out or changing the endpoint in a test, it won't call a real one and trigger real side effects.
However, this approach is potentially error prone, and oversights in the implementation or with future changes could cause network calls to still be made. Examples include:
- A new endpoint could be added by a developer without remembering to or knowing that they needed to override the test route
- An endpoint could be missed being overridden in the first place
- A third party library could be making a request that the developer didn't know about or wasn't accounted for
This is mostly a concern with Spring integration tests that spin up some or all of the environment (e.g. using
@ExtendWith(SpringExtension.class)). However, this could conceivably apply to a unit test if a component used something as a non-required constructor argument that connected to the network, or if a developer passed in a real network-connecting component where they should have used a mock or something connecting to
It occurs to me that there might be a more bullet-proof solution to this scenario. For instance, perhaps there is a way to tell the JVM or its underlying HTTP/FTP/etc. libraries to block all external network traffic.
Is there a way to prevent nonlocal network access in Java Spring Boot JUnit tests, or otherwise provide a guarantee that external network endpoints will not be called?...
ANSWERAnswered 2021-May-12 at 22:43
I don't know of a way to do this within the JVM environment.
It sounds like you are talking more about functional/integration testing than unit testing. I suspect, docker would probably work well since you can isolate the network for a container explicitly. I personally use WireMock with docker compose to do something very similar.
Spring Security here and trying to figure out how to use a
MethodInvocation instance to get:
- a list of all the arguments (name and type) passed to the method; and
- each argument's corresponding value
There is the
MethodInvocation#getArguments() : Object method but there is absolutely zero Spring Security documentation as to what type(s) can be returned inside the object array.
ANSWERAnswered 2021-May-21 at 19:10
It is an array containing all the arguments of the invoked method .The most left argument starts from the index 0 and so on.
Suppose the invoked method is :
See the Build from Source wiki page and also CONTRIBUTING.md.
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