CF push works nicely, automated deploy fails on Bluemix - jenkins

Question

I have a Java maven project that i deploy to Bluemix using cf push. Works like a charm. It has this manifest:
applications:
- services:
- Monitoring and Analytics-gm
- somedb
disk_quota: 1024M
hosts:
- someapp
name: someapp
path: target/someapp-0.0.2.war
domain: mybluemix.net
instances: 1
memory: 512M
However when I push my repository to hub.jazz.net and kick off build and deploy, the deploy step fails. I checked the artifacts in the build step and the war file got created.
The error message is:
Server error, status code: 400, error code: 170004, message: App staging failed in the buildpack compile phase
What do I miss?
Update
The last lines from the successful build script:
[INFO] Packaging webapp
[INFO] Assembling webapp [someapp] in [/home/jenkins/workspace/8c791c21-d195-9b03-f3ab-1c2cb5a8a9b4/0d82aa76-8fb2-463b-b1d6-6ec80a763706/target/someapp-0.0.2]
[INFO] Processing war project
[INFO] Copying webapp resources [/home/jenkins/workspace/8c791c21-d195-9b03-f3ab-1c2cb5a8a9b4/0d82aa76-8fb2-463b-b1d6-6ec80a763706/src/main/webapp]
[INFO] Webapp assembled in [56 msecs]
[INFO] Building war: /home/jenkins/workspace/8c791c21-d195-9b03-f3ab-1c2cb5a8a9b4/0d82aa76-8fb2-463b-b1d6-6ec80a763706/target/someapp-0.0.2.war
[INFO] WEB-INF/web.xml already added, skipping
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 11.424 s
[INFO] Finished at: 2015-09-15T10:59:52+00:00
[INFO] Final Memory: 17M/27M
[INFO] ------------------------------------------------------------------------
Uploading artifacts ...
UPLOAD SUCCESSFUL
Total time: 2 seconds
Finished: SUCCESS
As you can see the target/someapp-0.0.2.war is build which is the one referred to in the deploy script
The last lines from the failed deploy script
cf --version
/usr/bin/cf-orig/cf version 6.7.0-IDS-2014-12-04T10:56:46+00:00
+ echo 'Target: https://api.ng.bluemix.net'
Target: https://api.ng.bluemix.net
+ source _deploy.sh
++ cf push someapp
Updating app someapp in org someuser#ibm.com / space somespace as someuser#ibm.com...
OK
Uploading someapp...
Uploading app files from: /home/jenkins/workspace/8c791c21-d195-9b03-f3ab-1c2cb5a8a9b4/7c0cd4a8-8ecf-4020-ae82-fc567dd666e9
Uploading 1.9M, 37 files
Done uploading
OK
Stopping app app someapp in org someuser#ibm.com / space somespace as someuser#ibm.com...
OK
Starting app someapp in org someuser#ibm.com / space somespace as someuser#ibm.com...
-----> Downloaded app package (3.9M)
-----> Downloaded app buildpack cache (4.0K)
FAILED
Server error, status code: 400, error code: 170004, message: App staging failed in the buildpack compile phase
TIP: use 'cf logs someapp --recent' for more information
Build step 'Execute shell' marked build as failure
Finished: FAILURE
log from cf logs someapp --recent
2015-09-15T22:53:49.75+0800 [API/5] OUT Updated app with guid 0ac55e94-12b6-490c-99a9-22dfd96ef293 ({"name"=>"someapp"})
2015-09-15T22:54:06.06+0800 [API/5] OUT Updated app with guid 0ac55e94-12b6-490c-99a9-22dfd96ef293 ({"state"=>"STOPPED"})
2015-09-15T22:54:09.68+0800 [DEA/3] OUT Got staging request for app with id 0ac55e94-12b6-490c-99a9-22dfd96ef293
2015-09-15T22:54:15.04+0800 [API/6] OUT Updated app with guid 0ac55e94-12b6-490c-99a9-22dfd96ef293 ({"state"=>"STARTED"})
2015-09-15T22:54:15.22+0800 [STG/3] OUT -----> Downloaded app package (3.9M)
2015-09-15T22:54:15.40+0800 [STG/3] OUT -----> Downloaded app buildpack cache (4.0K)
2015-09-15T22:54:15.84+0800 [STG/0] OUT -----> Liberty Buildpack Version: v1.22-20150824-1104
2015-09-15T22:54:15.84+0800 [STG/0] ERR E, [2015-09-15T14:54:15.846523 #56] ERROR -- /var/vcap/data/dea_next/admin_buildpacks/b1841a6c-5f84-4c40-ac86-9f4d5e8f0643_e788f7b61c5fadd2fec138a1417cd3e1d345df32/lib/liberty_buildpack/buildpack.rb:50:in `rescue in drive_buildpack_with_logger': Compile failed with exception #<RuntimeError: No supported application type was detected>
2015-09-15T22:54:15.84+0800 [STG/0] ERR No supported application type was detected
2015-09-15T22:54:15.85+0800 [STG/0] OUT Staging failed: Buildpack compilation step failed
2015-09-15T22:54:16.70+0800 [API/6] ERR encountered error: App staging failed in the buildpack compile phase
I tried:
no path: in manifest.yml
path: target/someapp-0.0.2.war (that works on local cf push)
path: someapp-0.0.2.war
None of them worked

Answer 1

Aaarrgghh..... 5 hours of my life gone.
I deleted the project and recreated it. When checking the Build Archive Directory it had the entry target (seems to get added when you select mvn). Despite the fact that I tried with path: someapp-0.0.2.war, that didn't work.
Only after removing target and setting path: target/someapp-0.0.2.war the now clean project did build.
So lesson learned: When switching to a mvn build, remove the target from the Build Archive Directory

Answer 2

Yeah usually the error you got means if wasn't able to find the source for your app or the source for the app is wrong... You could also try adding the following line to manifest.yml.
buildpack: liberty-for-java
Your new manifest would be.
applications:
- services:
- Monitoring and Analytics-gm
- somedb
disk_quota: 1024M
hosts:
- someapp
name: someapp
path: target/someapp-0.0.2.war
buildpack: liberty-for-java
domain: mybluemix.net
instances: 1
memory: 512M