${gcloud.plugin.version} cannot be resolved

[codedread]

I'm trying to follow https://cloud.google.com/appengine/docs/java/tools/maven to create a new App Engine skeleton project in my Google Cloud Shell.

1. Java and Maven configuration information from gcloud shell:

$ mvn -v
Apache Maven 3.3.9 (bb52d8502b132ec0a5a3f4c09453c07478323dc5; 2015-11-10T08:41:47-08:00)
Maven home: /apache-maven-3.3.9
Java version: 1.7.0_111, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-7-openjdk-amd64/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.16.0-4-amd64", arch: "amd64", family: "unix"

2. Running the following command:

$ mvn archetype:generate -Dappengine-version=1.9.48 -Dmyappid= -Dfilter=com.google.appengine.archetypes:appengine-skeleton-archetype

3. I get the following prompt:

[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Maven Stub Project (No POM) 1
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] >>> maven-archetype-plugin:2.4:generate (default-cli) > generate-sources @ standalone-pom >>>
[INFO]
[INFO] <<< maven-archetype-plugin:2.4:generate (default-cli) < generate-sources @ standalone-pom <<<
[INFO]
[INFO] --- maven-archetype-plugin:2.4:generate (default-cli) @ standalone-pom ---
[INFO] Generating project in Interactive mode
[INFO] No archetype defined. Using maven-archetype-quickstart (org.apache.maven.archetypes:maven-archetype-quickstart:1.0)
Choose archetype:
1: remote -> com.google.appengine.archetypes:appengine-skeleton-archetype (A skeleton application with Google App Engine)
Choose a number or apply filter (format: [groupId:]artifactId, case sensitive contains):

where I choose 1. (FWIW, Why does it ask me this when I've specified it on the command line via -Dfilter) ?

4. It then asks me the App Engine version:

Choose com.google.appengine.archetypes:appengine-skeleton-archetype version:
1: 1.8.7
2: 2.0.0-1.9.10
3: 2.0.1-1.9.20
4: 2.0.2-1.9.21
5: 2.0.2-1.9.25
6: 2.1.0-1.9.38

I have no idea what to choose here (didn't I specify that in -Dappengine-version?) since 1.9.48 is not listed here. I choose 6 (the default).

5. I then enter a few random strings and accept some random defaults :)

Define value for property 'groupId': : com.foo.bar
Define value for property 'artifactId': : myappid
Define value for property 'version': 1.0-SNAPSHOT: :
Define value for property 'package': com.foo.bar: :
[INFO] Using property: appengine-version = 1.9.48
[INFO] Using property: application-id = myappid
Dec 21, 2016 12:03:07 PM org.apache.velocity.runtime.log.JdkLogChute log
INFO: FileResourceLoader : adding path '.'
Dec 21, 2016 12:03:07 PM org.apache.velocity.runtime.log.JdkLogChute log
INFO: Null reference [template 'gcloud-version', line 1, column 1] : ${gcloud.plugin.version} cannot be resolved.
Define value for property 'gcloud-version': ${gcloud.plugin.version}: :

At this point it's complaining that the gcloud.plugin.version cannot be resolved. Selecting the default seems like it's a broken thing to do.

6. In a different gcloud shell, I tried this:

$ gcloud --version
Google Cloud SDK 137.0.1
alpha 2016.01.12
app-engine-go
app-engine-go-linux-x86_64 1.9.48
app-engine-java 1.9.46
app-engine-php " "
app-engine-python 1.9.40
beta 2016.01.12
bq 2.0.24
bq-nix 2.0.24
cloud-datastore-emulator 1.2.1
core 2016.12.08
core-nix 2016.11.07
gcd-emulator v1beta3-1.0.0
gcloud
gsutil 4.22
gsutil-nix 4.18
kubectl
kubectl-linux-x86_64 1.4.6
pubsub-emulator 2016.08.19

Based on the above, I am not really sure what I should put into the interactive prompt

7. FWIW, I accepted the defaults and it said:

Confirm properties configuration:
groupId: com.foo.bar
artifactId: myappid
version: 1.0-SNAPSHOT
package: com.foo.bar
appengine-version: 1.9.48
application-id: myappid
gcloud-version: ${gcloud.plugin.version}
Y: : y
[INFO] ----------------------------------------------------------------------------
[INFO] Using following parameters for creating project from Archetype: appengine-skeleton-archetype:2.1.0-1.9.38
[INFO] ----------------------------------------------------------------------------
[INFO] Parameter: groupId, Value: com.foo.bar
[INFO] Parameter: artifactId, Value: myappid
[INFO] Parameter: version, Value: 1.0-SNAPSHOT
[INFO] Parameter: package, Value: com.foo.bar
[INFO] Parameter: packageInPathFormat, Value: com/foo/bar
Dec 21, 2016 12:15:33 PM org.apache.velocity.runtime.log.JdkLogChute log
INFO: Null reference [template 'gcloud-version', line 1, column 1] : ${gcloud.plugin.version} cannot be resolved.
[INFO] Parameter: gcloud-version, Value: ${gcloud.plugin.version}
[INFO] Parameter: package, Value: com.foo.bar
[INFO] Parameter: version, Value: 1.0-SNAPSHOT
[INFO] Parameter: groupId, Value: com.foo.bar
[INFO] Parameter: appengine-version, Value: 1.9.48
[INFO] Parameter: application-id, Value: myappid
[INFO] Parameter: artifactId, Value: myappid
[INFO] project created from Archetype in dir: ...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 15:37 min
[INFO] Finished at: 2016-12-21T12:15:33-08:00
[INFO] Final Memory: 15M/48M
[INFO] ------------------------------------------------------------------------

8. I then went into the directory it created and continued to try and follow the tutorial:

$ mvn clean install
[INFO] Scanning for projects...
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[ERROR] Resolving expression: '${gcloud.plugin.version}': Detected the following recursive expression cycle in 'gcloud.plugin.version': [gcloud.plugin.version] @
[ERROR] Resolving expression: '${gcloud.plugin.version}': Detected the following recursive expression cycle in 'gcloud.plugin.version': [gcloud.plugin.version] @
[ERROR] 'build.plugins.plugin.version' for com.google.appengine:gcloud-maven-plugin must be a valid version but is '${gcloud.plugin.version}'. @ line 118, column 24
@
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR] The project ...:1.0-SNAPSHOT (.../pom.xml) has 3 errors
[ERROR] Resolving expression: '${gcloud.plugin.version}': Detected the following recursive expression cycle in 'gcloud.plugin.version': [gcloud.plugin.version] -> [Help 2]
[ERROR] Resolving expression: '${gcloud.plugin.version}': Detected the following recursive expression cycle in 'gcloud.plugin.version': [gcloud.plugin.version] -> [Help 2]
[ERROR] 'build.plugins.plugin.version' for com.google.appengine:gcloud-maven-plugin must be a valid version but is '${gcloud.plugin.version}'. @ line 118, column 24
[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/ProjectBuildingException
[ERROR] [Help 2] http://cwiki.apache.org/confluence/display/MAVEN/InterpolationCycleException

[njtromp]

I encountered the same issue. Choosing option number 5: 2.0.2-1.9.25' solved the issue. This version is also reported as a valid option on https://cloud.google.com/appengine/docs/java/tools/maven.

Hope this helps.