In this (Why is everybody talking about Quarkus?) Java User Group Hamburg (CyberJUG-HH) session I highlighted possible reasons for Quarkus' popularity, explained Quarkus' optimisation tricks, the differences between Jakarta EE / J2EE / Java EE application servers and Quarkus, discussed the role of MicroProfile and Jakarta EE, migrated a Java EE application to Quarkus, performed multiple deployments, decompiled some code, measured memory consumption and finally cross compiled the Java service to native code using GraalVM:

Macs are using port 5900 for screen sharing, often also used by video conferencing software like Skype or Microsoft Teams.

Payara uses the same port 5900 for the hazelcast grid as starting port. At collision, payara won't start and complain with:

[#|...|WARNING|Payara 5.201|com.hazelcast.nio.tcp.TcpIpConnection|_ThreadID=108;_ThreadName=hz._hzInstance_1_development.IO.thread-in-1;_TimeMillis=1600401135525;_LevelValue=900;|
[...]:4900 [development] [3.12.6] Connection[id=5, /...:63015->/...:5900, qualifier=null, endpoint=[...]:5900, alive=false, type=NONE] closed. 
Reason: Exception in Connection[id=5, /...:63015->/...:5900, qualifier=null, endpoint=[...]:5900, alive=true, type=NONE], thread=hz._hzInstance_1_development.IO.thread-in-1
java.lang.IllegalStateException: Unknown protocol: RFB
    at com.hazelcast.nio.tcp.UnifiedProtocolDecoder.onRead(UnifiedProtocolDecoder.java:107)
    at com.hazelcast.internal.networking.nio.NioInboundPipeline.process(NioInboundPipeline.java:135)
    at com.hazelcast.internal.networking.nio.NioThread.processSelectionKey(NioThread.java:369)
    at com.hazelcast.internal.networking.nio.NioThread.processSelectionKeys(NioThread.java:354)
    at com.hazelcast.internal.networking.nio.NioThread.selectLoop(NioThread.java:280)
    at com.hazelcast.internal.networking.nio.NioThread.run(NioThread.java:235)
|#]
    The DAS was stopped    

Solution

1. Disable screen sharing in "System Preferences->Sharing->Screen Sharing" or:
2. Change Payara's port by replacing in $PAYARA_HOME/glassfish/domains/domain1/domain.xml the line <hazelcast-runtime-configuration></hazelcast-runtime-configuration> with <hazelcast-runtime-configuration start-port="59000"></hazelcast-runtime-configuration>. Now Payara will use the port 59000 instead of 5900

The live, on-stage hacking Guild42 session "Serverless Java #slideless" featuring: fnproject.io, microprofile.io, quarkus.io and several Java (openJDK) and native (GraalVM) deployments to AWS Lambda is available:

openJ9 vs HotSpot: ~48% less memory consumption and ~28% faster startup:

Creating, deploying and testing a Jakarta EE / MicroProfile application with the MicroProfile / Jakarta EE Essentials Archetype and wad.sh in 5 mins:

Subscribe to airhacks.fm podcast via: spotify| iTunes| RSS

78th airhacks.tv event with 20+ questions and topics like:

"Java on RaspberryPI, Quarkus Hackathlon, the state of architectural frameworks, Java on Mac, JPA vs. JDBC, encoding, metrics and OpenTracing, code review, document databases, testing RolesAllowed, kafka and JPA, transaction monitoring, exception handling"

...is published:

Future episodes and online events are also going to be also announced at: Airhacks Meetup Group.

The 0.0.7+ version of the Jakarta EE / MicroProfile essentials archetype:

mvn archetype:generate \
    -DarchetypeGroupId=com.airhacks \
    -DarchetypeArtifactId=jakartaee-essentials-archetype \
    -DarchetypeVersion=0.0.7

...generates a microservice with corresponding system test.

The following command:

mvn archetype:generate \
    -DarchetypeGroupId=com.airhacks \
    -DarchetypeArtifactId=jakartaee-essentials-archetype \
    -DarchetypeVersion=0.0.7 \
    -DgroupId=com.airhacks \
    -DartifactId=duke \
    --batch-mode

...creates the duke (Java 11, Jakarta EE 8, MicroProfile 3 based) microservice, as well as, the module duke-st containing the System- / Black Box tests.

The system tests are accessing the microservice via the Rest Client for MicroProfile API and JUnit 5.

1. Vom Java-Entwickler zum Webguru in 60 Minuten #slideless [online event]
   livecoding session 9 Sep 2020 https://jax.de/web-development-javascript/vom-java-entwickler-zum-webguru-in-60-minuten/
2. Jakarta EE and MicroProfile: a Kickstart with reasonable Practices [online event]
   livecoding session 9 Sep 2020 https://jax.de/serverside-enterprise-java/jakarta-ee-and-microprofile-a-kickstart-with-reasonable-practices/
3. Kickass Java Micro Backends #slideless [online event]
   livecoding session 11 Sep 2020 https://javaday.istanbul/speaker/adam-bien/
4. Kickass Single Page Apps #slideless [online event]
   livecoding session 11 Sep 2020 https://javaday.istanbul/speaker/adam-bien/
5. Serverless Java #slideless [online event]
   livecoding session 14 Sep 2020 https://guild42.ch/event/serverless-java-slideless/
6. "Warum spricht (fast) jeder über Quarkus"? [online event]
   JUG live coding 17 Sep 2020 https://www.meetup.com/jug-hamburg/events/272597035/
7. Architecting and Designing Java, MicroProfile and Jakarta EE Applications [online event]
   live, interactive, virtual workshop 24 Sep 2020 https://airhacks.live
8. MicroProfile Health, Metrics and Fault Tolerance Implementation Strategies #slideless [online event]
   prerecorded session 13 Oct 2020 https://whova.com/embedded/session/jkcon_202009/1115382/
9. Live Virtual MicroProfile on Kubernetes Hacking #slideless [online event]
   prerecorded session 14 Oct 2020 https://whova.com/embedded/session/jkcon_202009/1115432/
10. MicroProfile with Quarkus [online event]
    live, interactive, virtual workshop 10 Dec 2020 https://workshops.adam-bien.com/quarkus.htm
11. Micro Frontends with Web Components, lit-html and redux, December [online event]
    live, interactive, virtual workshop 11 Dec 2020 https://workshops.adam-bien.com/microfrontends.htm

For additional, also free, events like e.g. airhacks.tv, checkout: meetup.com/airhacks/.

Questions and topics (https://gist.github.com/AdamBien/6fb9ae56e83d78d643343013fa1a304d) for the 78th airhacks.tv:

1. Java on RaspberryPI
2. thoughts on Quarkus Hackathlon
3. airhacks.com and airhacks.live 2020 updates
4. architectural frameworks vs. conventions (conventions are explained in Apps with MicroProfile workshop)
5. setup Java environment for a mac
6. JPA vs. JDBC
7. charsets,keyboards and inputs
8. metrics, rest clients and metrics for intra service calls (conventions are explained in Apps with MicroProfile workshop)
9. interactive project jareto review
10. document databases search suggestions
11. test with @RolesAllowed and JASPIC
12. kafka and JPA (overflow from 77th airhacks.tv)
13. transactions profiling with MicroProfile
14. exceptions handling with MicroProfile (overflow from 77th airhacks.tv) (conventions are explained in Apps with MicroProfile workshop)

Any questions left? Ask now: https://gist.github.com/AdamBien/6fb9ae56e83d78d643343013fa1a304d and get the answers at the next airhacks.tv.