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Spring Boot Migration  RSS feed

 
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Hi all,

I would like to migrate a java application using Rest to Spring Boot. I am thinking in using Spring Boot Web starter for migrating an app written in Java.

Should I just "import" the code into the Spring Boot Rest app?

Regards, Isaac
 
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I'm not sure how to answer. Migrating existing apps to Boot have a difficulty ranging from 1 (super easy) to 10 (insanely hard, don't even try it). It kinda depends on the app you're starting with. If you're starting with an existing (non-Boot) Spring application, it might be fairly straightforward. If you're starting with some other framework, then it might be more difficult.

At the risk of giving a trite answer: It depends.

Isaac Ferguson wrote:Hi all,

I would like to migrate a java application using Rest to Spring Boot. I am thinking in using Spring Boot Web starter for migrating an app written in Java.

Should I just "import" the code into the Spring Boot Rest app?

Regards, Isaac

 
Angus Ferguson
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I am starting with the migration for it I am using the Spring Initializr to create the basic structure, but which one shoudl I use?

The project to migrate contains Rest Services and credentials. Which starter should I use ?

Regards, Isaac
 
Craig Walls
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Rest-Repositories is for automatically creating REST endpoints for any repositories you may have created with Spring Data. If you are using Doring Data, it’s certainly worth looking into.

For creating your own REST endpoints, not necessarily associated with a Spring Data repository, you should pick either Spring MVC (Web) or Spring WebFlux (Reactive Web). The choice here hinges on whether you are ready to go reactive in your app.


Isaac Ferguson wrote:I am starting with the migration for it I am using the Spring Initializr to create the basic structure, but which one shoudl I use?

The project to migrate contains Rest Services and credentials. Which starter should I use ?

Regards, Isaac

 
Angus Ferguson
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I have choosen Spring MVC, Security and Jersey.

Jersey for REST, Security for authentication and Spring MVC?
 
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You might want to look at Spring REST: https://spring.io/guides/gs/rest-service/ as it seems to be illustrating something along what you're talking about.

In most cases, Spring modules are built on top of general modules, such as Spring JPA's ability to use Hibernate. And in fact, when you have a standard interface (such as JPA), often the underlying module is plug-replaceable.

So there's a very good chance that you could use Jersey and leverage it using Spring REST.

 
Angus Ferguson
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Spring JPA's ability to use Hibernate



The app I need to migrate it is only Rest and Authetication without persistence I understand that Spring Rest is usd when there is persistence.

 
Angus Ferguson
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You might want to look at Spring REST: https://spring.io/guides/gs/rest-service



This is Spring but I want to use Spring Boot and the right starter.
 
Angus Ferguson
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Tim Holloway
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Isaac Ferguson wrote:

You might want to look at Spring REST: https://spring.io/guides/gs/rest-service



This is Spring but I want to use Spring Boot and the right starter.



Read it more carefully. There's Spring Boot sample code in there.

Also, I question that Spring REST requires persistence. Spring has a whole separate module realm for persistence and they don't tend to lump unrelated functions together.
 
Angus Ferguson
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Yes this is to make it executable...
 
Angus Ferguson
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In fact for security I would like to use LDAP.
 
Angus Ferguson
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When starting the migration and I set up the basic Spring Boot structure I get the next error in the pom.xml.

Plugin execution not covered by lifeclicle configuration: org.apache.maven.plugins : maven-resources-plugin:3.1.0:(execution : default-testResources, phase:testResources.processs-test-resource)
 
Angus Ferguson
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The pom.xml is this one:


 
Angus Ferguson
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I am migrating a Java 2 EE app to Spring Boot and I ask myself which of the next Java EE2 could be correlated with Spring Boot. The same way that we can substitute @Inject by @Autowired.



The question is which ones have a Spring Boot counterpart.

 
Angus Ferguson
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Basically all is about using this dependency in the code.

 
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First of all, I'd upgrade to the latest Spring Boot version, 2.1.1.RELEASE.

You can see the classes related to email sending in Spring (Boot) here:
* https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/mail/package-summary.html
* https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/mail/javamail/package-summary.html

In this case, JavaMailSender is the interface to inject. You can use MimeMessageHelper and MimeMessagePreparator to create the actual message. An example can be found on https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/mail/javamail/MimeMessageHelper.html. However, since MimeMessagePreparator is a functional interface, you can shorten that example:
 
Angus Ferguson
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I am trying to use two @RestControllers in two dfferent classes and within each of them several @RequestMapping.

One of them follows the path /v1 it works and it is reflected in the tab Spring Elements.

The other class is in a different package within src/main/java but it is not automatically reflected in the tab Spring Element and is it not called when the app calls its path "v2"

Any strategy to make it works with v2?

 
Rob Spoor
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Can you give us the fully qualified names of these two classes, and the fully qualified name and annotations of the class annotated with @SpringBootApplication?

My guess is that the second class does not share a package structure with the @SpringBootApplication. If that's the case, you need to explicitly use @ComponentScan to include both sets of packages. @SpringBootApplication implies @ComponentScan without explicit packages / classes which is the same as @ComponentScan with the @SpringBootApplication class' package. If you use @ComponentScan you do not get this package for free anymore, that's why you need to add both sets.
 
Angus Ferguson
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Can you give us the fully qualified names of these two classes



@RestController
@RequestMapping("/v1")
/org.springframework.boot/src/main/java/ddddd/nton/rt/a/NtonController.java




@RestController
@RequestMapping("/v2")
/org.springframework.boot/src/main/java/ddddd/nton/v1/b/Nton.java





and the fully qualified name and annotations of the class annotated with @SpringBootApplication?





 
Angus Ferguson
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Sorry I pur quotes instead of "code"
 
Angus Ferguson
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Where should be this data located in the original JEE app? I need to migrate it to the springmail.properties ->application.properties
 
Angus Ferguson
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For example when I comment @ComponentScan({ "ddddd.nton.v1.b"}) it works, but when not I get ERR_CONNECTION_REFUSED in the browser.

 
Rob Spoor
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Just as I thought, the v1 controller shares a package structure with the @SpringBootApplication class. Both are in package ddddd.nton.rt.a, whereas the v2 controller lives in package ddddd.nton.v1.b (which is a odd, the versions don't match).

You have a few options:
1) Use @ComponentScan("ddddd.nton") to include everything under dddd.nton.
2) Use @ComponentScan({"dddd.nton.rt.a", "dddd.nton.v1.b"}) to include these exact two packages (and sub packages).
3) Like 2 put some combination of base packages (e.g. dddd.nton.rt and/or dddd.nton.v1).
4) Like 2 or 3 but using basePackageClasses (possibly with basePackages) with some classes instead of package names.

Isaac Ferguson wrote:Where should be this data located in the original JEE app? I need to migrate it to the springmail.properties ->application.properties


I think that depends on your container. In WebLogic those were defined in a mail session in the admin console. I can't remember how JBoss did it, and I've never really used GlassFish.
 
Angus Ferguson
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When I add the @ComponentScan({"dddd.nton.rt.a", "dddd.nton.v1.b"}) I get



The same if I put the packages in different @ComponentScan
 
Angus Ferguson
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I added the next annotations





 
Angus Ferguson
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it is an interface.
 
Angus Ferguson
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I am migrating a JEE application to Spring Boot.Originally in JEE I had this code




After reading about Spring Boot loggers looks like it should be done like this:




Later in the code it is written;



Should the logs go into the console or to a particular file?
 
Rob Spoor
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It depends on your logging configuration. I don't really know the defaults, but you can use a logback-spring.xml configuration file to change it. Alternatively, you can use the logging properties defined at https://docs.spring.io/spring-boot/docs/current/reference/html/common-application-properties.html to configure them in your application.properties.
 
Rob Spoor
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Isaac Ferguson wrote: it is an interface.


Do you have an annotated implementation for this interface? For some interfaces Spring Boot can create implementations (e.g. CrudRepository), but definitely not all.
 
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