I am working on a web project with spring framework and I need the #Transactional annotation for the connection to the database, but I have not been able to add it, I work from the IntelliJ id but it does not allow it.
Thanks
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If you cannot use this notation, which other could you use instead?
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Can anyone please help me on how to integrate Olingo (Odata) in a Springboot Java Appln.
I'm pretty new to Spring boot and have implemented one project and wanted it to convert to Oling (Odata).
I have gone through various resources but with a bunch of different approaches not sure how to do it the correct way.
Please let me know if some has worked on it and can guide me.
link to the project on which I applied spring-boot.
If you are trying to integrate OlingoJPA there are a couple of things you will have to do
Implement JPAServiceFactory and initializeODataJPAContext, basically this is about defining the persistence unit and entity manager
Then you can create a Spring Boot Configuration to mount your OData endpoint and initialize the EntityManagerFactory
Then you can point to your database here
An finally you can define the JPA entities you want your service to expose
The full Spring Boot + JPA project sample is located Github. Feel free to go though it, raise an issue or submit a Pull request for impalements
I'm working on a system's back end that uses Spring Boot, REST, HATEOAS, Hibernate and PostgreSQL. For validation, I started using classes that extend org.springframework.validation.Validator. It works well, but only for calls made by the front end. For calls made in the back end, such as by using EntityManager, they don't fire. I've managed to have another validator being called in this situation by using #Constraint for ElementType.TYPE, but it only gets called for create and save methods.
Is it possible to use this validator to validate on delete methods too? There's a project here that's a non operational subset of the project I'm working on, containing the validators I mentioned.
Thanks in advance.
P.S.: I'd rather avoid manually calling the validators whenever I call a repository method in the back end.
P.P.S.: This answer makes me believe it's possible, but I couldn't translate the XML configuration to JavaConfig.
I finally found the answer. In application.properties, add:
spring.jpa.properties.javax.persistence.validation.group.pre-remove=javax.validation.groups.Default
The linked question told me which property I needed, but I didn't know where to place it. I tried to use custom Java configuration and even persistence.xml configuration, but several other things failed.
Here, I learned that "[...] all properties in spring.jpa.properties.* are passed through as normal JPA properties (with the prefix stripped) when the local EntityManagerFactory is created." So I just added that prefix and it worked.
I have a project structure with three jar files. All are loaded into one classpath and then get executed. I am using the spring core, jpa and hibernate. #Services/#Autowired are working fine, as well as Entities and Repositories (all on a mysql database).
Now I want that the project can send and receive messages over network/internet. So I asked some people how I could achieve this without breaking my current structure. And I was told that spring-boot is the architecture for me because I do not need a web server (tomcat or glassfish) for it.
But now I am not sure if this is correct because I did not find any sources that say the same thing. Because of that I tried implementing it in order to verify it myself.
The important changes I made to my project (all pom.xml files and my configuration class) can be found here: http://84.141.90.123:9910/
From what I read I need the #SpringBootApplication annotation for spring boot. This is a equivalent to #Configuration, #ComponentScan, #EnableAutoConfiguration, #EnableWebMvc.
The first two are already in my structure. But when I add the last two annotations, I get different errors:
When I add #EnableAutoConfiguration I get
Caused by: java.lang.IllegalArgumentException: No auto configuration classes found in META-INF/spring.factories. If you are using a custom packaging, make sure that file is correct.
When I add #EnableWebMvc I get
Caused by: java.lang.IllegalArgumentException: A ServletContext is required to configure default servlet handling
From my bad english knollage, the #EnableWebMvc error seems to say that the application needs a web server (tomcat or glassfish).
So is the main statement wrong and I can not start spring boot without a web server?
Because I do not use any xml files and/or property files for spring (they did not worked), I only rely on java code based configuration for spring, jpa and hibernate. And therefore there are only very few tutorials/threads with help. Most of the time they just say add thi or add that to your xml but because I don't have them, it is a little pain in the ass.
Also I compile with aspectj, so I can not use the spring compile parent. And also I am not able to manipulate the main class/method, because the main class is in an outer jar file that is not programmed by me.
So concrete:
Can a spring boot application in a standalone jar run without a web server wrapping it?
If yes, what am I doing wrong? Am I missing a dependency, an annotation or a configuration?
If you want to receive messages over HTTP(ie run a REST API) then you need a web server.
If you just want to send messages over HTTP then you only need a HTTP client.
Spring-boot has the the option of running an embedded web server(tomcat by default), you don't need to run a separate application server.
To work out your issues with your build I would start with generating a project using spring initializr.
You can select the dependencies you want(try using the advanced version link at the bottom), and it will build a maven/gradle project for you with the right structure, build file and compatible dependencies.
Change :
public static void main(String[] args) {
SpringApplication.run(ActiveMqApplication.class, args);
}
to :
public static void main(String[] args) {
new SpringApplicationBuilder(ActiveMqApplication.class)
.web(WebApplicationType.NONE).run(args);
}
Is there a 'community/Spring' approved method with Boot to have different datasource target for the same project?
Should I include both connector (H2 and Mysql) in the project dependencies and just change the jdbc url in my application.yml?
We are switching our tomcat instance to a Boot project, old habits of having jdbc jar as provided. I was wondering if this was still supported or desired in a boot fat jar/war exec.
If I understood Your question correctly, there are two scenarios, that You could be intrested in.
First is where You use both datasources at once in your project (ex. getting data from both H2 and MySQL in the same time, or one after another).
Second scenario is when You use two datasources but not at once, for example: H2 for test/debug project build, MySQL for production. Another sub-scenario is like You want something like primary/secondary datasources.
Solution for first scenario is to add two dependencies, disable Boot autoconfiguration (autoconfiguration won't work for multiple datasources) for databases and manually configure tho separate EntityManagers etc. (more info here: https://docs.spring.io/spring-boot/docs/current/reference/html/howto-data-access.html#howto-use-two-entity-managers)
Sorry that I can't provide any code sample but I can't access my work repo from home.
Moving to the second scenario what You can do is, use profiles.
You have to create separate profile and application-something.yml file for that profile. Inside you configure your second datasource, and then in dependencies you can make your second database dependency to add only with specific profile as well - but here im not 100% sure, I don't remember how we did it in work ;d.
And again, I cant paste any example but here is some help:
Profiles,
Profile-specific configuration files
An then there is a sub-scenario that I mentioned earlier. Marking datasource as #Primary But here I've never used it, I just know it exists: Link
Edit2: After some rethinking, I think this is the way to go with Boot and active profiles: Spring Boot Maven Plugin
Sorry for a lot of spam, and reconsiderations. That was quite confusing for sure.
Hope that helps,
I'm attempting to integrate Spring's default access control list implementation into a Jersey contained Restful API. I successfully was able to implement Basic Authentication using the Spring Security Filter Chain and setting up an authentication manager in my securityContext.xml.
My problem in a nutshell is, after adding the acl-context.xml and making adjustments to other parts of the project, my project seems to not recognize the #pre and #post annotations. It doesn't throw an error, but it doesn't make queries to the database according to the mysql log. Is there something about the default implementation of Spring's ACL that relies on Spring MVC classes like #controller, #transactional, #resource, or #service?
Here is the repo with the code as it is now (I appologize for the extra classes laying about. It is a maven project.
https://github.com/DataAnalyticsinStudentHands/RESTFUL-WS/tree/secure
web.xml:
https://github.com/DataAnalyticsinStudentHands/RESTFUL-WS/blob/secure/src/main/webapp/WEB-INF/web.xml
webSecurityConfig.xml:
https://github.com/DataAnalyticsinStudentHands/RESTFUL-WS/blob/secure/src/main/resources/webSecurityConfig.xml
acl-context.xml:
https://github.com/DataAnalyticsinStudentHands/RESTFUL-WS/blob/secure/src/main/resources/acl-context.xml
pom.xml:
https://github.com/DataAnalyticsinStudentHands/RESTFUL-WS/blob/secure/pom.xml
I'm sorry I would love to paste the .xmls here but I can't seem to get the formatting to work and its deleting characters. Please let me know if there is anything else I can do to clarify the situation. If I'm doing anything overtly stupid in regards to anything else, please let me know. I welcome the criticism. I'm the only person on our team working on network security and I don't have anyone here to give me feedback.