Below is some filtered output from a maven build (showing maven meta
data being downloaded for one artifact). All my dependencies use version
ranges of the form [1.0.0.SNAPSHOT,2.0.0.SNAPSHOT)
In general the build fails with out of memory. I can increase the heap
size and the build is successful, but a relatively simple build is now
requiring 500MB heap size.
First question is why is maven re-checking and downloading the same meta
data over and over again?
If I add additional version ranged dependencies to my pom then the
problem seems to get exponentially worse. For a larger build so many
requests are made so quickly to the nexus remote repository that I start
to see "Error transferring file: Address already in use: connect".
Any ideas how to reduce the memory usage? Do not say "do not use version
ranges". We use semantic versioning enforced by API analysis tools for
each of our modules (OSGi bundles) so we require version ranges.
If I change all version range dependencies to an exact dependency (a
serious amount of pom editing) then all is fine. As you can tell below
we have 3 main internal remote repos setup (kirona, kirona-snapshot and
third.party.libraries). We do not specify version ranges on libraries
that are not in our control e.g. log4j etc etc
Downloading:
http://fuji:8081/nexus/content/repositories/third-party/com/kirona/server/third.party.libraries/maven-metadata.xml
Downloading:
http://fuji:8081/nexus/content/repositories/kirona/com/kirona/server/third.party.libraries/maven-metadata.xml
Downloaded:
http://fuji:8081/nexus/content/repositories/kirona-snapshots/com/kirona/server/third.party.libraries/maven-metadata.xml
(354 B at 21.6 KB/sec)
Downloaded:
http://fuji:8081/nexus/content/repositories/kirona/com/kirona/server/third.party.libraries/maven-metadata.xml
(318 B at 6.6 KB/sec)
Downloading:
http://fuji:8081/nexus/content/repositories/kirona/com/kirona/server/third.party.libraries/maven-metadata.xml
Downloading:
http://fuji:8081/nexus/content/repositories/kirona-snapshots/com/kirona/server/third.party.libraries/maven-metadata.xml
Downloading:
http://fuji:8081/nexus/content/repositories/kirona-knopflerfish/com/kirona/server/third.party.libraries/maven-metadata.xml
Downloading:
http://fuji:8081/nexus/content/repositories/third-party/com/kirona/server/third.party.libraries/maven-metadata.xml
Downloaded:
http://fuji:8081/nexus/content/repositories/kirona/com/kirona/server/third.party.libraries/maven-metadata.xml
(318 B at 10.0 KB/sec)
Downloaded:
http://fuji:8081/nexus/content/repositories/kirona-snapshots/com/kirona/server/third.party.libraries/maven-metadata.xml
(354 B at 11.2 KB/sec)
Downloading:
http://fuji:8081/nexus/content/repositories/kirona-snapshots/com/kirona/server/third.party.libraries/maven-metadata.xml
Downloading:
http://fuji:8081/nexus/content/repositories/third-party/com/kirona/server/third.party.libraries/maven-metadata.xml
Downloading:
http://fuji:8081/nexus/content/repositories/kirona/com/kirona/server/third.party.libraries/maven-metadata.xml
Downloading:
http://fuji:8081/nexus/content/repositories/kirona-knopflerfish/com/kirona/server/third.party.libraries/maven-metadata.xml
Downloaded:
http://fuji:8081/nexus/content/repositories/kirona/com/kirona/server/third.party.libraries/maven-metadata.xml
(318 B at 9.7 KB/sec)
Downloaded:
http://fuji:8081/nexus/content/repositories/kirona-snapshots/com/kirona/server/third.party.libraries/maven-metadata.xml
(354 B at 10.8 KB/sec)
Downloading:
http://fuji:8081/nexus/content/repositories/kirona/com/kirona/serve...........
The above problems renders eclipse useless with m2e, it causes eclipse
to hang on start up (build automatically set to true) and eventually die!!
I'm starting to come to the conclusion that between maven and m2e
version ranges just do not work very well. I hope I am wrong!!
Thanks
Paul
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