Cannot update pmml-android from 1.3.6 to 1.4.15 due to jackson dependency

[jamesweb1]

I try to update pmml-android from 1.3.6 to 1.4.15. But it cannot run mvn clean install successfully. It shows the following errors:

[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary for JPMML-Android 1.0-SNAPSHOT:
[INFO] 
[INFO] JPMML-Android ...................................... SUCCESS [  0.158 s]
[INFO] pmml-android ....................................... SUCCESS [  3.407 s]
[INFO] pmml-android-example ............................... FAILURE [01:19 min]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  01:24 min
[INFO] Finished at: 2020-02-19T18:09:49+08:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.jpmml:pmml-maven-plugin:1.4.15:ser (default) on project pmml-android-example: Execution default of goal org.jpmml:pmml-maven-plugin:1.4.15:ser failed: Plugin org.jpmml:pmml-maven-plugin:1.4.15 or one of its dependencies could not be resolved: Failed to collect dependencies at org.jpmml:pmml-maven-plugin:jar:1.4.15 -> org.jpmml:pmml-model-jackson:jar:1.4.15 -> com.fasterxml.jackson.core:jackson-databind:jar:2.9.0,pr4-SNAPSHOT: Failed to read artifact descriptor for com.fasterxml.jackson.core:jackson-databind:jar:2.9.0,pr4-SNAPSHOT: Could not find artifact com.fasterxml.jackson:jackson-bom:pom:2.9.0.pr4-SNAPSHOT in sonatype-nexus-snapshots (https://oss.sonatype.org/content/repositories/snapshots) -> [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/PluginResolutionException
[ERROR] 
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR]   mvn <goals> -rf :pmml-android-example

How can I solve this issue?

[vruusmann]

The JPMML-Android project is obsolete today, because you can distribute PMML models in the JSON data format (instead of the default XML data format), or transpile them to 100% Java bytecode using the JPMML-Transpiler library.

I really should do a technical post about it one day.

How can I solve this issue?

Identify which JPMML library is bringing in the Jackson transitive dependency (eg. using mvn dependency:tree), and then add the following exclusion:

<dependency>
  <groupId>..</groupId>
  <artifactId>..</artifactId>
  <exclusions>
    <exclusion>
      <groupId>org.jpmml</groupId>
      <artifactId>pmml-model-jackson</artifactId>
    </exclusion>
  </exclusions>
</dependency>

[vruusmann]

Failed to read artifact descriptor for com.fasterxml.jackson.core:jackson-databind:jar:2.9.0,pr4-SNAPSHOT

I ran into exactly the same issue today, when pushing out new commits to the 1.5-SNAPSHOT development branch:
https://travis-ci.org/jpmml/jpmml-model/builds/652544379

Turns out that some Maven repositories contain an incomplete Jackson 2.9.0.pr4-SNAPSHOT version. The only fix for this is to update the range of Jackson dependency to "2.9.1 or greater", so that this incomplete 2.9.0-pr4 would fall outside of its bounds.

Here's my code change:
c952016

[jamesweb1]

Thanks your help. I'm trying to use jpmml-transpiler to load the pmml file into my Android App. But I cannot translate it to ModelEvaluator successfully.

Here is the example of my code:

val inputStream = context!!.assets.open("model.pmml")
val xmlPmml = PMMLUtil.unmarshal(inputStream)
val jCodeModel = TranspilerUtil.translate(xmlPmml, "com.example.PMMLModel")
val javaPmml = PMMLUtil.load(jCodeModel.javaClass.classLoader)
clf = ModelEvaluatorBuilder(javaPmml).build()
clf?.verify()

It shows error:

2020-02-20 10:55:00.984 7810-7810/com.example.pmml W/System.err: org.xml.sax.SAXException: Can't create default XMLReader; is system property org.xml.sax.driver set?
2020-02-20 10:55:00.984 7810-7810/com.example.pmml W/System.err:     at org.xml.sax.helpers.XMLReaderFactory.createXMLReader(XMLReaderFactory.java:160)
2020-02-20 10:55:00.984 7810-7810/com.example.pmml W/System.err:     at org.jpmml.model.SAXUtil.createFilteredSource(SAXUtil.java:35)
2020-02-20 10:55:00.984 7810-7810/com.example.pmml W/System.err:     at org.jpmml.model.PMMLUtil.unmarshal(PMMLUtil.java:54)
2020-02-20 10:55:00.984 7810-7810/com.example.pmml W/System.err:     at com.example.pmml.Classifier$Companion.initEventClassifier(Classifier.kt:24)
2020-02-20 10:55:00.984 7810-7810/com.example.pmml W/System.err:     at com.example.pmm.InitProvider.onCreate(InitProvider.kt:16)
2020-02-20 10:55:00.984 7810-7810/com.example.pmml W/System.err:     at android.content.ContentProvider.attachInfo(ContentProvider.java:2113)
2020-02-20 10:55:00.984 7810-7810/com.example.pmml W/System.err:     at android.content.ContentProvider.attachInfo(ContentProvider.java:2087)
2020-02-20 10:55:00.984 7810-7810/com.example.pmml W/System.err:     at android.app.ActivityThread.installProvider(ActivityThread.java:7364)
2020-02-20 10:55:00.984 7810-7810/com.example.pmml W/System.err:     at android.app.ActivityThread.installContentProviders(ActivityThread.java:6909)
2020-02-20 10:55:00.984 7810-7810/com.example.pmml W/System.err:     at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6826)
2020-02-20 10:55:00.984 7810-7810/com.example.pmml W/System.err:     at android.app.ActivityThread.access$1400(ActivityThread.java:267)
2020-02-20 10:55:00.984 7810-7810/com.example.pmml W/System.err:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1981)
2020-02-20 10:55:00.985 7810-7810/com.example.pmml W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:107)
2020-02-20 10:55:00.985 7810-7810/com.example.pmml W/System.err:     at android.os.Looper.loop(Looper.java:237)
2020-02-20 10:55:00.985 7810-7810/com.example.pmml W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:7770)
2020-02-20 10:55:00.985 7810-7810/com.example.pmml W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
2020-02-20 10:55:00.985 7810-7810/com.example.pmml W/System.err:     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
2020-02-20 10:55:00.985 7810-7810/com.example.pmml W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1047)

I saw the usage in JPMML-Transpiler, and it said loading xmllmml first and then write to file and read from file and using URLClassLoader to load to javaPmml. It seems to be a little complicated for my application. I just want to load model.pmml in the Android device and make the correct ModelEvaluator to predict. What's the best solution for me?

[vruusmann]

In principle, you need to split your workflow into two pieces.

The first three lines must be executed in an environment that provides JAXB functionality (Android doesn't):

val inputStream = context!!.assets.open("model.pmml")
val xmlPmml = PMMLUtil.unmarshal(inputStream)
val jCodeModel = TranspilerUtil.translate(xmlPmml, "com.example.PMMLModel")

Dump the above jCodeModel object into a JAR file, and distribute it instead of the PMML XML file.

The second piece - loading a transpiled org.dmg.pmml.PMML object from the JAR file - should work in any environment as it uses Java/JVM natine class file loading only (ie. there is no XML work involved).