26thAirhacksQ&A.md

26thAirhacksQ&A.md

Ask questions and see you at May, 9th at 6.PM. CET: http://www.ustream.tv/channel/adambien Also see archives: airhacks.tv

1. Java EE 8 News

Hi Adam,

i'm using your wildfly-ping example to deploy the ping.war into wildfly in a docker container. Everythings works fine, but how can i redeploy the changed ping.war into wildfly without restarting the container. Stopping the container takes a long time, so no fast redeployment is possible in this way.

Thanks.

Hi Adam,

how to handle distributed systems concerns with microservices such as:

• Service discovery, have you use any platform like snoopEE? Which is the best in your opinion?
• Distributed transaction services, maybe with rest endpoints modeled as staless EJBs?
• Logging and debugging for the whole project.

Thanks in advanced ;)

Hi Adam,

I'm trying to configure security with a jdbc realm on an application bundled up as a fat jar with payara micro, but I just can't seem to get it to work. I've tried to run the jar with the --domainConfig option and a domain.xml with the configuration for the jdbc realm and when I try to log in to the application I get the error that "No LoginModules configured for fileRealm". However if I set the alternate domain.xml within the application using PayaraMicro.setAlternateDomainXML() I get "No LoginModules configured for jdbcRealm". (At least the correct realm).

I already deployed my application using the full payara server and it works. So I don't know what I could be doing wrong or what steps I might be missing to get this to work on payara micro. Do you have any ideas?

Hi Adam,

How would you tackle from the performance perspective the traversing of JPA relationships.
Here is an example:

Class RiskAssessment{
        ...
        List<Step> steps; // one-to-many
}

Class Step{
        ...
        List<HazardType > hazardTypes; // one-to-many
}

Class HazardType{
        ...
        List<Hazard> hazards; // one-to-many
}

Class Hazard{
        ...
        List<Control> controls; // one-to-many
}

Given a RiskAssessment id, I'd like to load all the Hazard and Control objects associated with it.

List<Hazard> loadAllHazardsAndControls(Integer riskAssessmentId){
......
}

I'd like to access the DB as few times as possible.I know that using nested to loops is not efficient as I would fall into the N+1 query issue.

How would you tackle this problem? Using JPQL queries and chaching query_results? If a second call to the method loadAllHazardsAndControls() occurs with the same Id parameter I would like my query(or my way to load the relationships) to remain completely In Memory.

Thanks in advance!

Hi Adam Bien,

I want to Develop Java EE Website, with multi-language(Arabic and English) with JSF.

Arabic is read right to left, layout, fonts are different.
Do i have to maintain two different websites, one for Arabic and the second for English ?
http://www.mydomain.com/ar
http://www.mydomain.com/en

Thanks in advance