i have some standard Spring #Service classes in a separate jar lib that use the standard #Cacheable Spring annotation, in a Spring boot project i declare the dependency, configure a CacheManager and just works!
i try to do the same in a Grails 3.1 project but with no luck!
i discover that https://github.com/grails-plugins/grails-cache require to use its 'proprietary' #Cacheable annotation:
http://grails-plugins.github.io/grails-cache/3.0.x/api/grails/plugin/cache/Cacheable.html
As workaround i FORKED some Service just to use the Grails #Cacheable and it's working but i'd like to have a single #Service that works under grails or not!
I have misconfigured something, it doesn't behave the same way, but i can't figure out what is it!
i'd like to share this jar lib between spring only & grails projects, but so far i can't make caching work, unless i forked the service calsses under
grails-app/services directory & used 'proprietary' #Cacheable annotation;
i try to remove the plugin and configure the bean and the cache in:
/GPsGrails3/grails-app/init/gpsgrails3/Application.groovy
with the org.springframework.context.annotation.Bean annotation:
#Primary
#Bean
public ConcurrentMapCacheManager concurrentMapCacheManager() {
return new ConcurrentMapCacheManager();
}
#Bean
public SignatureService signatureService() {
SignatureService _signatureService = new SignatureService();
return _signatureService;
}
i put signatureService under grails-app/services directory:
/GPsGrails3/grails-app/services/it/finmatica/ifw/impl/SignatureService.groovy
Maybe i have to configure my beans in:
/GPsGrails3/grails-app/conf/spring/resources.groovy ?
i have to use the version 4 of the plugin?
compile "org.grails.plugins:cache:4.+"
I am not sure what the question is but you don't have to use the Grails #Cacheable annotation. If you want to use the Spring one in a Grails app, you can, and it will behave in the same way that it would if you weren't using Grails. You don't even need the plugin in order to do that.
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I have a Spring Boot 2.4 project that is using spring-boot-starter-data-solr. Unfortunately, spring-boot-starter-data-solr is not supported anymore (see https://spring.io/projects/spring-data-solr#overview) , so I can't easily upgrade Spring Boot as I usually do for other projects.
However, I thought I would still try to upgrade my project and keep using the latest spring-boot-starter-data-solr I could get : maybe it's not supported anymore, but I am not making an extensive use of it, so maybe I can take advantage of latest Spring Boot features for a some more time, before there's really a breaking change and I really can't use spring-boot-starter-data-solr
So, I upgraded my project to Spring Boot 2.6.4 letting Spring BOM pull all the latest versions of all dependencies managed. Of course, it failed on spring-boot-starter-data-solr, so I had to declare the version explicitly :
implementation 'org.springframework.boot:spring-boot-starter-data-solr:2.4.13'
I fixed few other things, and my project compiles. However, at startup (and in some integration tests), I have a problem :
#Configuration
public class PersistenceConfig {
#Bean
public TicketRepository ticketRepository(SolrTicketEntityRepository solrTicketEntityRepository) {
return new TicketRepositoryImpl(solrTicketEntityRepository);
}
... some other beans..
}
with SolrTicketEntityRepository defined like below :
public interface SolrTicketEntityRepository extends SolrCrudRepository<TicketEntity, String> {
#Query("?0")
Page<TicketEntity> search(String searchText, Pageable pageable);
With Spring Boot 2.6, the SolrTicketEntityRepository doesn't get instanciated anymore, so I have a missing bean at startup. I've tried adding the #EnableSolrRepositories on PersistenceConfig, but it doesn't do anything.
is there a way to mimic Spring Boot magic, and trigger programmatically SolrTicketEntityRepository / SolrCrudRepository instanciation, to be able to start my application ?
or is it way too complicated, and as recommended here , should I implement the stuff myself with the core Solr libraries without Spring Boot's help (which would be the objective at some point anyway) ?
Upgrading an existing system to Spring Boot with Auto config. Currently the system is all Java config. I'm confused over whether to continue the use of #Profile. Is this annotation no longer needed? I searched extensively about upgrading and found only references to non-Spring Java migration and creating new projects.
Typical #Profile usage in our configuration classes looks something like:
#Bean
#Profile("is-standalone")
public Service unsecuredService(SomeApi someApi) {
return new ...
}
I inferred from the Spring Boot examples that using one of the #Conditional annotations is recommended like this:
#Bean
#ConditionalOnProperty("unsecured.enabled")
public Service unsecuredService(SomeApi someApi) {
return new ...
}
Then in a YAML file the is-standalone Profile enables or disables all the various properties for that Profile. Is this the proper way to upgrade? To repeat a question from above differently, can the #Profile usage be left as is? This is for a fairly large project, the upgrade is non-trivial, so I would like to do this only once!
Depends where your previous #Profile annotation is coming from. If you're using Spring's #Profile, the functionality is as follows:
Annotating a class with #Profile("dev") will load the class and register it in the Spring context only when the dev profile is active
Annotating a class with #Profile("!dev") will load the class and register it in the Spring context only when the dev profile is inactive
If this sounds like what you have already, no change is needed.
I have a spring boot rest service that included an external project in pom as it's dependency. That external project is basically a jar that has spring AOP code.
The base package in my main application that includes this external jar with spring AOP code is x.y.z
The class in external jar where the #before advice is, is under the package a.b.c
With this class under a.b.c package, it doesn't get recognized by the main application where I want to use the spring aop implementation and apply the aspect. However, when I change it's package from a.b.c to x.y.z (which I really can't do in real life) it works fine.
I know that in spring boot service which happens to be the including service, it scans everything under root package given in the application class, x.y.z in this case and that is why aspect works fine if it's class is under x.y.z.
however, the problem is that this spring app jar will be used across multiple applications. So changing package name like this is not an option.
Is there a way to accomplish this without changing the package name of the class where spring app code is ?
Probably component scan is only activated for your application class packages by default. You can extend it to multiple packages, including the aspect package:
XML style configuration:
<context:component-scan base-package="x.y.z, a.b.c" />
Annotation style configuration:
#ComponentScan(basePackages = {"x.y.z", "a.b.c"})
Disclaimer: I am not a Spring user, only an AspectJ expert. I just knew that you can configure component scan, googled the syntax for you and hope it is correct.
Please define the bean (of jar project )inside main application. Give the #ComponentScan(basePackages = {"x.y.z", "a.b.c"}) as well as #EnableAspectJAutoProxy. Also include below piece of code.
ex:
` #Bean
public LoggingHandler loggingHandler()
{
return new LoggingHandler();
}`
Also annotate external jar code with:
`#Aspect
#Component
public class LoggingHandler {`
What #kriegaex suggests is correct. In addition to that, please make sure you are using #Component along with #Aspect. Since #Aspect is not a Spring annotation, Spring won't recognize it and hence your aspect won't be registered. So, using #Component is mandatory to getting aspects to work in Spring environment.
Spring boot provides #ComponentScan to find packages to be scanned.
I am building a library which has #RestControllers inside with package com.mylib.controller. There are other classes as well with stereotype annotations in different packages.
So, if some one is developing SpringBoot Application with com.myapp base package.
He uses my library in his application. He need to mention #ComponentScan("com.mylib") to discover stereotype components of library.
Is there any way to scan components without including library package in #ComponentScan?
As spring-boot-starter-actuator expose its endpoints just with dependency, without defining #ComponentScan. OR any default package which is scanned regardless of application base package.
You could create a Spring Boot Starter in the same style as the Spring Provided Starters. They are essentially a jar'd library with a a spring.factories file pointing to the #Configuration class to load with some other annotations on there to provide overriding/bean back off (#ConditionalOnMissingBean) and generally provide their own #ConfigurationProperties.
Stéphane Nicoll provided an excellent demo of how to build one.
https://github.com/snicoll-demos/hello-service-auto-configuration
It is also documented in the Spring Boot documentation. https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-developing-auto-configuration.html
The library approach would also work but I see no benefit in not making it a starter. Additionally for any library/starter I'd recommend dropping the #ComponentScan and just defining the beans in a #Configuration. This will work for sterotypes like #RestController etc. will function as normal if you create an #Bean out of it in a configuration.
Spring boot starter are special artifacts designed by Spring and used by Spring.
You can check that in the source code that contains mainly a
spring.provides file :
provides: spring-boot-actuator,micrometer-core
I don't know the exact way to process in the same way as Spring Boot Starter but as probably acceptable workaround, you could define in your jar a #Configuration class that specifies #ComponentScan("com.mylib").
#Configuration
#ComponentScan("com.mylib")
public class MyLibConfig {
//...
}
In this way, clients of the jar need "only" to import the #Configuration class :
#Import(MyLibConfig.class)
#Configuration
public class ClientConfig{
//...
}
I looking for dynamically loading jar in spring boot after compiling, for example I will put jars in some folder and when spring boot is started, all jars from this folder will be injected into spring boot app. I don't know how can I do this with spring boot, and if You know can help me with this, with some example.
I need this jars to have #Service, #Controller as this will be module (plugin), with adding capabilities to my spring boot app.
Is possible to do this with spring boot, and if it is possible, please provide me with some sample code.
Thanks in advance.
UPDATE:
I found something https://www.youtube.com/watch?v=F-sw2pFdcDw https://code.google.com/p/jspf/
UPDATE 2: I can't get #Controller bean from plugin jar registered in Spring Boot
Have a look at FlexiCore, an open-source framework that brings modularity to spring boot utilizing plugins(jars) loaded at runtime See wizzdi and FlexiCore.
for example FlexiCore allows you to create a project ( compiled into a seperate jar from your main application) that contains a spring bean as follows:
#Component
#Extension
public class HelloWorldService implements ServicePlugin{
public String hello() {
return "Hello World!";
}
}
it will be automatically be loaded once placed inside the designated plugins folder, it basically allows a full support for most(all) of spring boot features , so for example you can add a RestController bean to your jar as well , FlexiCore will automatically load that bean allowing you to call the controller as if it was in your main application jar:
#RestController
#Extension
public class TestEntityController implements Plugin {
private static final String template = "Hello, %s!";
private final AtomicLong counter = new AtomicLong();
#Autowired
private TestEntityService testEntityService;
#PostMapping("/createTestEntity")
public TestEntity createTestEntity(#RequestParam(name="name", required=false, defaultValue="Stranger") String name) {
return testEntityService.createTestEntity(name);
}
#GetMapping("{id}")
public TestEntity getTestEntity(#PathVariable("id")String id) {
return testEntityService.getTestEntity(id);
}
}
Disclaimer: I am the CTO of wizzdi, the company powering FlexiCore.
One option is definitely to just use broad #ComponentScan. If you add new jar to classpath the annotated classes from that jar will get discovered via #ComponentScan, #Controllers will get mapped etc.
The XML equivalent here would be placing xml configuration files somewhere to your classpath (META-INF folder being obvious choice) and import them all using wildcard. The idea is the same. If the plugin jar file is on classpath you will get the xml file imported and the beans (controllers, ...) will get loaded.
There are drawbacks to this approach like the modules not being isolated but its definitely option for simpler applications.
You can find a sample spring boot web project here.
By dynamically loading jars I assume you want to add dependencies to your project. For this you can update pom.xml of the sample project and put your dependencies here.