STS Roo, GWT and Maven troubles

Maven can be a good tool for its ends. It certainly has its fair share of sharp edges which can make a bad impression with users.  When I was about to work with Maven again, after a long period, I had to find out why it did not run.

I am using STS (SpringSource Tool Suite), built on Eclipse, with Roo included.  In order to experiment and learn Roo, I included relearning Maven as well, as it is used in some examples for learning Roo. Well actually, Roo's setup of GWT uses Maven.
  • springsource-tool-suite-2.5.0.M3-e3.6-win32-x86_64-installer
  • maven-2.2.1.RELEASE (included with this STS)
  • roo-1.1.0.M3 (included with this STS)
Download and installation of this STS went flawless.

The processing of the steps outlined in Roo start went fine.

I started my own project with 4 entities and 2 enums. I figured out some commands to get the enums in.  Entering the last commands, the process halted on the 'gwt setup' command. Two error messages were presented (below).
  • An immidiate message in Roo shell; "Command 'gwt setup' was found but is not currently available (type 'help' then ENTER to learn about this command)". While recognizing the helpful intent, it did alas not give any further clues as to why the command was not available.
  • An error dialog named "Error: Updating Maven Configuration" appeared, delayed by STS trying to process the initiated "Updating Maven Configuration".
After some back and forth troubleshooting, trying the 'gwt setup' command again even hang the STS on the Maven configuration step.

Out of several initiatives, the last one did the trick for me.
  • Set M2, M2_HOME, JAVA_HOME as per Maven installation instructions, and rebooted
  • Created a skeletal ~/.m2/settings.xml which was indicated as missing when accessing STS's Window/Preferences/Maven/User Settings
  • Used Maven command line utility to verify Maven was working; mvn -v
  • Configured a JPA provider and an associated database for Roo to use, simply by issuing the command given by the hint command; persistence setup --provider HIBERNATE --database HYPERSONIC_IN_MEMORY
  • Cleaned ~/.m2 directory and rebuilt it by issuing mvn clean and mvn eclipse:clean eclipse:eclipse
  • Some forum message told that the 'gwt setup' command becomes available after a project has been set up using 'project' command.  So I set up a new project and it now seems the message 'not available' could mean that it has already been issued. How silly!  This error message is nothing to worry about then.

Populære innlegg fra denne bloggen

5 generations of computer languages

We control computers by writing code that is executed by the central processing unit (CPU). With an increasing degree, this code models the functions performed by the computer and its parts, and how they work together.  Such code has a syntax and semantics which together comprise a computer language.  Computer languages have during the last 50+ years undergone big changes.  They have become easier to use, more expressive and more structured than the first generations.   Note that the description of the computer language generations is subject to historical reviews and may change as one get further distance to the matter. However, for the past 10 and coming10 years or so, the current description should do. In the following presentation, some info are picked from Wikipedia [ H1 ] and some are mixed with my own info and viewpoints into a lethal cocktail which is probably neither correct nor complete. Read at your own risk!  My effort has been less to lec...
Les mer

DOJO kamptyper [forbedre egen kompetanse]

Noen ideer har poppet opp i det siste, trigget av dialog med kolleger; DOJO Code Battle / Showdown samme utfordring, implementer over begrenset tid, oppnå mest mulig funksjonalitet, fagfelle scoring, kan velge det språk/rammeverk en vil, kan gjentas flere ganger om en vil, til en får oppnådd og tilfredstilt sine egne krav til ytelse.  F.eks. kode en mikrotjeneste.  Tenk på en idrettsmann som øver på en ting til perfeksjon.  Dette gjør oss i stand til å gjøre løse ofte forekommende situasjoner raskt og effektivt, så vi kan bruke øvrig tid på andre saker, og gir oss selvtillit til at vi gjør en effektiv jobb. DOJO Theory Battle Hvor ulike forklaringer om samme konsept møtes for å bli enige om en felles forståelse, f.eks. bli enige om hva 'mikrotjenester' er.  Slik enighet om begreper er viktig for fremdrift og fellesskap; å dra i samme retning, få drahjelp, å hjelpe andre lenger i samme retning, å komme lenger enn en selv klarer, og å klare å snakke...
Les mer

Generations of text formats

In 1985, on a practice week in  some company downtown Bergen, I was lucky to get a course in Text editing software on Wang Computers.  Extensive use of function keys.  Very advanced functions, word-splitting, etc.  No font to select, very easy that way. In 1991, while visiting ABB in Heidelberg, Germany, as a student on a job acquired through IAESTE, I met my first text file format, the NROFF unix manual typesetting language. In 1992, I tried gopher hyperlink navigation. In 1993, the World Wide Web started for me, authoring web pages.  Setting up a web server. In 1997, while starting work on master thesis, I learned LaTeX.  \bold{text}.  Very powerful.  Even math equations.  Difficult with images.  Much more powerful than MS-Word.  Many templates available, for different end-results.  Each journal had their own format standards. Sometime 2000, a colleague looked into DocBook.  Also 2000s, I used Trac wiki and its syntax. S...
Les mer