I think the word "register" comes from DataNucleus, which might be using some sort of mechanism such as ServiceLoader [1] or perhaps the way that JDBC Drivers register themselves with DriverManager through a class static initializer. It obviously doesn't allow two JARs to attempt to re-register the same implementation.
Ultimately the issue must come down to the way in which maven is building the list of JARs to build or run, and it isn't realizing that the lower case c:\... and upper case C:\... are the same file. One clue from this article [2] is the statement: "On Windows systems, the getCanonicalPath() method will also uppercase the drive letter.", so I'm guessing that maven is being fed "c:\..." and then different bits of Maven are inconsistent in how that it is treated, with it being canonicalized along the way. Just a thought... do you have M2_HOME or M2_REPO defined as environment variables? And if so, do they use the lower case c:\... ? In which case, perhaps change them to uppercase might fix the problem. Thx Dan [1] http://www.oracle.com/technetwork/articles/javase/extensible-137159.html [2] http://www.avajava.com/tutorials/lessons/whats-the-difference-between-a-files-path-absolute-path-and-canonical-path.html On Thu, 29 Dec 2016 at 21:38 Stephen Cameron <steve.cameron...@gmail.com> wrote: > OK, I'll try to figure it out. > > I don't know what it means to 'register' something according to maven, that > is a strange message, might have the read the manual, I deleted that jar > from the local maven repository and it just complained again. > > If I just bump up the Isis version number on my own project to 1.13.2 in > pom file that works fine, so something different in the pom files?. > Initially I had a problem, so I tried the archetype, got a problem there, > went back to my project and did a clean and then install and it was fine. > > > > On Fri, Dec 30, 2016 at 4:30 AM, Dan Haywood <d...@haywood-associates.co.uk > > > wrote: > > > Hi guys, > > > > thanks for reporting this, though unfortunately I can't reproduce. > > > > Looking at the error message, I do see one clue: > > > > "file:/d:/maven/repository/org/datanucleus/datanucleus-api- > > jdo/4.1.1/datanucleus-api-jdo-4.1.1.jar" > > > > is already registered, and you are trying to register an identical > > plugin located > > at URL > > > > "file:/D:/maven/repository/org/datanucleus/datanucleus-api- > > jdo/4.1.1/datanucleus-api-jdo-4.1.1.jar." > > > > > > I see that the first is listed as d:, while the second is D: Obviously > > these are the same file, but I can imagine that using cygwin or msysgit > or > > similar might consider these as different files. > > > > Since there's nothing in the archetype (I'm aware of) that relates to > > Windows per se, my guess is that this is some sort of issue with your > > environment. (For what it's worth, I develop on Windows, and "it works > for > > me"). > > > > I've also had a go at building on a vanilla docker image (I used > > frekele/maven on docker hub), and could also build both the archetype and > > the app fine (was I also apt-get update && apt-get install git). > > > > If you can provide any other info, I'll take another look > > > > Thx > > Dan > > > > > > > > On Fri, 23 Dec 2016 at 08:54 Vladimir Nišević <vnise...@gmail.com> > wrote: > > > > > Yes, I observe same issue, tried with artifact version 1.13.2 > > > > > > BR,Vladimir > > > > > > 2016-12-23 5:51 GMT+01:00 Stephen Cameron <steve.cameron...@gmail.com > >: > > > > > > > Hi, > > > > > > > > I am try to a maven clean build on the SimpleApp archetype and get > the > > > > following error message. > > > > > > > > Maybe something in the pom.xml files? > > > > > > > > [INFO] > > > > [INFO] SimpleApp Parent ................................... SUCCESS [ > > > > 2.553 s] > > > > [INFO] SimpleApp Simple Module ............................ FAILURE [ > > > > 10.456 s] > > > > [INFO] SimpleApp Application .............................. SKIPPED > > > > [INFO] SimpleApp Webapp ................................... SKIPPED > > > > [INFO] > > > > ------------------------------------------------------------ > > ------------ > > > > [INFO] BUILD FAILURE > > > > [INFO] > > > > ------------------------------------------------------------ > > ------------ > > > > [INFO] Total time: 14.053 s > > > > [INFO] Finished at: 2016-12-23T15:45:15+11:00 > > > > [INFO] Final Memory: 30M/981M > > > > [INFO] > > > > ------------------------------------------------------------ > > ------------ > > > > [ERROR] Failed to execute goal > > > > org.datanucleus:datanucleus-maven-plugin:4.0.5:enhance > > (process-classes) > > > > on > > > > project myapp-module-simple: Error executing DataNucleus tool > > > > org.datanucleus.enhancer.DataNucleusEnhancer: > > InvocationTargetException: > > > > Plugin (Bundle) "org.datanucleus.api.jdo" is already registered. > Ensure > > > you > > > > dont have multiple JAR versions of the same plugin in the classpath. > > The > > > > URL > > > > "file:/d:/maven/repository/org/datanucleus/datanucleus- > > > > api-jdo/4.1.1/datanucleus-api-jdo-4.1.1.jar" > > > > is already registered, and you are trying to register an identical > > plugin > > > > located at URL > > > > "file:/D:/maven/repository/org/datanucleus/datanucleus- > > > > api-jdo/4.1.1/datanucleus-api-jdo-4.1.1.jar." > > > > -> [Help 1] > > > > [ERROR] > > > > [ERROR] To see the full stack trace of the errors, re-run Maven with > > the > > > -e > > > > switch. > > > > [ERROR] Re-run Maven using the -X switch to enable full debug > logging. > > > > [ERROR] > > > > [ERROR] For more information about the errors and possible solutions, > > > > please read the following articles: > > > > [ERROR] [Help 1] > > > > http://cwiki.apache.org/confluence/display/MAVEN/ > > MojoExecutionException > > > > [ERROR] > > > > [ERROR] After correcting the problems, you can resume the build with > > the > > > > command > > > > [ERROR] mvn <goals> -rf :myapp-module-simple > > > > > > > > > >
