Jakarta EE microprofiles, some readings

https://openliberty.io/blog/2018/06/08/java-microservices-microprofile.html


https://jakarta.ee/about/

https://www.amazon.com/Hands-Cloud-Native-Microservices-Jakarta-microservices-ebook/dp/B07NDBQPLF/ref=sr_1_4?__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&keywords=microprofiles&qid=1558959093&s=books&sr=1-4

Swagger for Java EE reasteasy or jersey

Making Swagger work in Spring is very easy.

You can use it also in Java EE (Wildfly, WebLogic, even Tomcat!!! )

but all the documentation I have found is a bit outdated:

I have tried APIEE https://dzone.com/articles/apiee-an-easy-way-to-get-swagger-on-java-ee and https://github.com/phillip-kruger/apiee but it's not showing my services and I see no error.

Some other outdated articles:

https://github.com/swagger-api/swagger-core/wiki/Swagger-Core-Jersey-2.X-Project-Setup-1.5



https://github.com/swagger-api/swagger-core/wiki/Swagger-Core-RESTEasy-2.X-Project-Setup-1.5

I have no time now, but if I need to write REST services in Java EE I would not live without Swagger...

CDI and javax.transaction.TransactionScoped

I was wondering how TransactionScoped works, and I stumbled upon this wonderful example:

https://www.byteslounge.com/tutorials/java-ee-cdi-transactionscoped-example

This also is a great explanation on Injected beans https://www.byteslounge.com/tutorials/java-ee-cdi-dependency-injection-inject-tutorial

It's so clearly explained that I was deeply impressed by this www.byteslounge.com
Gonçalo Marques. We need more of this stuff. Often people post partial, overcomplicated examples.... Gonçalo instead goes straight to the point.

Useful Java EE patterns

If you need a self-refreshing cache - with a timer to fetch updates - visible to all users:

annotate a class ApplicationCache with:

@javax.enterprise.context.ApplicationScoped
@javax.ejb.Singleton
@javax.ejb.ConcurrencyManagement(ConcurrencyManagementType.BEAN)


initialize it with a method annotated with
@javax.annotation.PostConstruct
public void startup()

provide a scheduled method:

@javax.ejb.Schedule(dayOfWeek = "1-5", hour = "*", minute = "*/30", persistent = false)
public void refreshCache()


Wherever you want to invoke a service method on the above class, you acquire a reference with

@javax.inject.Inject
private ApplicationCache applicationCache;


=================



If you need a logger:

@javax.inject.Inject
private org.slf4j.Logger logger;


=================



if you need a thread-safe collection:

private final List employees = Collections.synchronizedList(new ArrayList());
private final Map employeesMap = Collections.synchronizedMap(new HashMap());

===================

WebLogic 12 shared libraries

https://docs.oracle.com/cd/E24329_01/web.1211/e24368/libraries.htm#WLPRG325

Excellent presentation here:



it's always recommended to set Specification Version and Implementation Version in the MANIFEST.MF

same is true with Applications : Weblogic-Application-Version should be set in MANIFEST.MF (see https://docs.oracle.com/cd/E24329_01/web.1211/e24368/versioning.htm#WLPRG250 )

WebLogic Java EE tutorials

(or J2EE as someone still says)
putting together a lost of documentation and training material to become a WebLogic and Java Enterprise Edition GURU:

https://docs.oracle.com/javaee/7/JEETT.pdf

https://docs.oracle.com/middleware/12212/wls/WLPRG/WLPRG.pdf "Developing Applications for Oracle WebLogic Server"

https://docs.oracle.com/middleware/1221/wls/EJBAD.pdf Developing Enterprise JavaBeans for Oracle WebLogic Server

Install latest JDK from here http://www.oracle.com/technetwork/java/javase/downloads/index-jsp-138363.html

You can download "Oracle Enterprise Pack for Eclipse" from here http://www.oracle.com/technetwork/developer-tools/eclipse/downloads/index.html and the WLS 12 installer here http://www.oracle.com/technetwork/middleware/weblogic/downloads/wls-main-097127.html

Security https://docs.oracle.com/middleware/1221/wls/SCOVR.pdf

Web Services https://docs.oracle.com/middleware/1221/wls/WSOVR.pdf and https://docs.oracle.com/middleware/12212/wls/WSGET/WSGET.pdf

WebService security https://docs.oracle.com/middleware/1221/wls/WSSOV.pdf

Restful WebServices https://docs.oracle.com/middleware/1221/wls/RESTF.pdf

Securing WebServices with Policies https://docs.oracle.com/middleware/1221/owsm/OWSMS.pdf

Developing Web Applications https://docs.oracle.com/middleware/12212/wls/WBAPP/WBAPP.pdf

Of course, don't expect to find anything readable in the Oracle documents, they are made 90% of "if you want to know something about this, follow this link" , or just a dry list of standards, all in a completely unemotional language that puts you immediately to sleep. But their JEE7 Tutorial is quite decent, however it's only meant for Glasshfish development.

Here also plenty of short tutorials https://apexapps.oracle.com/pls/apex/f?p=44785:OLL_SEARCH:116956567220019:::2:P2_SEARCH_TEXT:Weblogic

And of course all the OracleWeblogic youtube videos https://www.youtube.com/user/OracleWebLogic/videos