I have participated to LinuxDay 2015 organized by Ferrara Linux User Group with a presentation titled “MUTANTS KILLER - PIT: state of the art of mutation testing system”:
Few days ago I was asked to configure a JBoss EAP 6.4.3.GA environment on my computer because of a new project I should work on in the next months.
The first annoying problem I had to face was about the following error log message:
15:50:12,375 INFO [org.jboss.modules] (main) JBoss Modules version 1.3.7.Final-redhat-1 15:50:12,551 INFO [org.jboss.msc] (main) JBoss MSC version 1.1.5.Final-redhat-1 15:50:12,600 INFO [org.jboss.as] (MSC service thread 1-1) JBAS015899: JBoss EAP 6.4.3.GA (AS 7.5.3.Final-redhat-SNAPSHOT) starting ... 15:50:17,618 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-2) MSC000001: Failed to start service jboss.serverManagement.controller.management.http: org.jboss.msc.service.StartException in service jboss.serverManagement.controller.management.http: Address already in use: bind localhost/127.0.0.1:9990 at org.jboss.as.server.mgmt.HttpManagementService.start(HttpManagementService.java:227) [jboss-as-server-7.5.3.Final-redhat-SNAPSHOT.jar:7.5.3.Final-redhat-SNAPSHOT] at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1980) [jboss-msc-1.1.5.Final-redhat-1.jar:1.1.5.Final-redhat-1] at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1913) [jboss-msc-1.1.5.Final-redhat-1.jar:1.1.5.Final-redhat-1] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0_25] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0_25] at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_25] Caused by: java.net.BindException: Address already in use: bind at sun.nio.ch.Net.bind0(Native Method) [rt.jar:1.8.0_25] at sun.nio.ch.Net.bind(Net.java:436) [rt.jar:1.8.0_25] at sun.nio.ch.Net.bind(Net.java:428) [rt.jar:1.8.0_25] at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:214) [rt.jar:1.8.0_25] at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74) [rt.jar:1.8.0_25] at org.jboss.sun.net.httpserver.ServerImpl.<init>(ServerImpl.java:144) at org.jboss.sun.net.httpserver.HttpServerImpl.<init>(HttpServerImpl.java:54) at org.jboss.sun.net.httpserver.DefaultHttpServerProvider.createHttpServer(DefaultHttpServerProvider.java:38) at org.jboss.com.sun.net.httpserver.HttpServer.create(HttpServer.java:147) at org.jboss.as.domain.http.server.ManagementHttpServer.create(ManagementHttpServer.java:168) at org.jboss.as.server.mgmt.HttpManagementService.start(HttpManagementService.java:193) [jboss-as-server-7.5.3.Final-redhat-SNAPSHOT.jar:7.5.3.Final-redhat-SNAPSHOT] ... 5 more
The log said
Address already in use: bind localhost/127.0.0.1:9990 so the question was: which service is running on port 9990 on this microsoft windows computer?
The scenario is the one in which we want to know some information about a deployed war going to a public url such as
Achiving that is quite simple using maven.
Usually to interact between a remote Subversion repository and a local Git repository you have to be on the local
master branch and run:
git svn dcommitinstead of
git svn rebaseinstead of
git pull --rebase
There is no equivalent to
git pull because Subversion and Git handle merges differently, so to prevent Subversion committers saw merge commits a
rebase is mandatory.
You can get the best of Git working with Subversion interacting between the Git local repository and the local working directory.
So you can:
- preparing to commit only the part of a file you want, by using
git add --patch
- rewriting commit history, by using
git rebase --interactiveand the various
- extremely quickly create new branches
- including in the current branch a single commit made on another branch, by using
git bisectto find which commit caused a particular bug
- temporarily parking last changes to face an emergency, by using
git stash save my_current_issue
and do all the other stuff you can do locally that make you love Git.
I want to stress about using local branches to your benefit only and not to collaborate with other committers. This means you have to merge locally your branches into master before interacting with remote subversion repository. In this way no one could see your merge commits.
Italian government on December 2012 changed the art. 68 of the eGovernment Code (Codice dell'Amministrazione Digitale (in Italian)) (CAD) indicating to public administrations (PA) the obligation to prefer Free Software assessing software acquisition.
The novelty aspect of the new art.68 (it) lies in comma 1-ter where is stated that “proprietary software acquisition with user license” (“l'acquisizione di programmi informatici di tipo proprietario mediante ricorso a licenza d'uso”) is permitted only if
“it is motivationally impossible to get existing solutions yet available to public administrations, or to get Free Software or Open Source Software, appropriate for the current needs to be satisfied”.
“risulti motivatamente l'impossibilità di accedere a soluzioni già disponibili all'interno della pubblica amministrazione, o a software liberi o a codici sorgente aperto, adeguati alle esigenze da soddisfare”.
The comma 1-ter, among other things, designates the Italian Digital Agency (Agenzia per l'Italia Digitale (AgID) to write modalities and criteria to perform the assessment. To do this the AgID published a news (in Italian) to form a committee (tavolo di lavoro (TdL)) to write guidelines about “Criteri per valutazioni comparative ai sensi dell'art. 68 del CAD”. I found the news curious because there were explicitely written:
“It will be a privileged title holding a role as […] open source software community’s representative”
“Costituirà titolo di preferenza rivestire un ruolo di […] referenti di community del software a codice sorgente aperto”
On December 2012 I sent my application as Java User Group Padua (in Italian)’s representative, on March 2013 I was selected, and in the middle of March I started working at the TdL.
TdL’s activities took place among March and July 2013, by 9 meeting e 5 hearings.
On the whole I’m almost satisfied. Certainly we might discuss about how these guidelines were or weren’t simple, but undoubtedly they help delineating the path stated by the art. 68. Moreover I’m proud to have participated in defining a national law which rules the country where I live in. I’m also grateful to had the opportunity to live an experience from which I learnt a lot.
This spring I was selected from Manning as one of the technical reviewers of the book “Git in Practice” by Mike McQuaid.
I’ve been using Git for about a year now, and I studied it on the online documentation but I found the McQuaid’s book easier to read because lots of chapters have their title which may be considered as a FAQ and its four subsections Background, Problem, Solution, Discussion, offer a common way to understand the chapter’s main subject.
Writing good commit messages is extremely important because:
- good commit messages help the future (poor) maintainer
- good commit messages speed up the peer reviewing process
- good commit messages are used to generate a good release note
I hope the presentation “Commit messages - Good practices ” will help developers becoming more aware about how good commit messages could improve their work.
This autumn I was selected from Manning as one of the technical reviewers of the book “Gradle in Action” by Benjamin Muschko.
Gradle in Action starts with a beautiful introduction to Gradle with the classic “in action” approach.
Hibernate Tools is a toolset for Hibernate3 implemented as an integrated suite of Eclipse plugins, together with a unified Ant task for integration into the build cycle.
Working with Maven you can use the hibernate3-maven-plugin. But this is (as the name states) only for Hibernate 3 and does not support Hibernate 4.
As reported by Thomas Letsch  the Hibernate tools for Hibernate 4.x is not yet finished, and the obvious solution is to just use the Maven ant-run plugin and execute the hibernate-tools Ant task. So following the Thomas Letsch’s article I have worked out a solution that suits me well.