1 problem was encountered while building the effective model for XXX during n/a

[Bukama]

Not sure if it's a problem of the flatten-plugin or the specific dependency, but the error message looks strange

[INFO] --- flatten:1.7.0:flatten (common-flatten) @ XXXX ---
[INFO] Generating flattened POM of project XXX ...
[WARNING] 1 problem was encountered while building the effective model for org.javassist:javassist::3.18.1-GA during n/a (use -X to see details)
[WARNING] 1 problem was encountered while building the effective model for org.javassist:javassist::3.18.1-GA during n/a (use -X to see details)
[WARNING] 1 problem was encountered while building the effective model for org.javassist:javassist::3.18.1-GA during n/a (use -X to see details)
[WARNING] 1 problem was encountered while building the effective model for org.javassist:javassist::3.20.0-GA during n/a (use -X to see details)

"during n/a" is not very useful :( Maybe it can be improved.

[slawekjaranowski]

Are more info with -X?

[Bukama]

So finally found some time to analyse this with -X.

The flatten plugin first says "while building the effective model for org.javassist:javassist:jar:3.18.1-GA during dependency collection step for ", without saying for what at the end.
Then (in the "stacktrace" of this) it says multiple times "while building the effective model for org.javassist:javassist::3.18.1-GA during n/a".

[INFO] --- flatten:1.7.0:flatten (flatten) @ MYONE ---
[DEBUG] Loading mojo org.codehaus.mojo:flatten-maven-plugin:1.7.0:flatten from plugin realm ClassRealm[plugin>org.codehaus.mojo:flatten-maven-plugin:1.7.0, parent: jdk.internal.loader.ClassLoaders$AppClassLoader@5bc2b487]
[DEBUG] Configuring mojo execution 'org.codehaus.mojo:flatten-maven-plugin:1.7.0:flatten:flatten' with basic configurator -->
[DEBUG]   (f) defaultOperation = flatten
[DEBUG]   (f) embedBuildProfileDependencies = false
[DEBUG]   (f) flattenDependencyMode = all
[DEBUG]   (f) flattenMode = resolveCiFriendliesOnly
[DEBUG]   (f) flattenedPomFilename = .flattened-pom.xml
[DEBUG]   (f) keepCommentsInPom = false
[DEBUG]   (f) mojoExecution = org.codehaus.mojo:flatten-maven-plugin:1.7.0:flatten {execution: flatten}
[DEBUG]   (f) omitExclusions = false
[DEBUG]   (f) outputDirectory = /home/jenkins/workspace/MYONE_defaultpipeline/jdk17/MYONE
[DEBUG]   (f) project = MavenProject: MYONE @ /home/jenkins/workspace/MYONE_defaultpipeline/jdk17/MYONE/pom.xml
[DEBUG]   (f) session = org.apache.maven.execution.MavenSession@11b32a14
[DEBUG]   (f) settings = org.apache.maven.execution.SettingsAdapter@5c5f0edc
[DEBUG]   (f) skip = false
[DEBUG]   (f) skipFlatten = false
[DEBUG]   (f) updatePomFile = true
[DEBUG] -- end configuration --
[INFO] Generating flattened POM of project MYONE...
[DEBUG] Property artifactId will be handled using interpolate in flattened POM.
[DEBUG] Property build will be handled using interpolate in flattened POM.
[DEBUG] Property ciManagement will be handled using interpolate in flattened POM.
[DEBUG] Property contributors will be handled using interpolate in flattened POM.
[DEBUG] Property dependencies will be handled using interpolate in flattened POM.
[DEBUG] Property dependencyManagement will be handled using interpolate in flattened POM.
[DEBUG] Property description will be handled using interpolate in flattened POM.
[DEBUG] Property developers will be handled using interpolate in flattened POM.
[DEBUG] Property distributionManagement will be handled using interpolate in flattened POM.
[DEBUG] Property groupId will be handled using interpolate in flattened POM.
[DEBUG] Property inceptionYear will be handled using interpolate in flattened POM.
[DEBUG] Property issueManagement will be handled using interpolate in flattened POM.
[DEBUG] Property licenses will be handled using flatten in flattened POM.
[DEBUG] Resolving dependencies of MYONE

[WARNING] 1 problem was encountered while building the effective model for org.javassist:javassist:jar:3.18.1-GA during dependency collection step for . Path to offending node from root:
 -> MYONE
 => org.javassist:javassist:jar:3.18.1-GA (compile)
Problem
* 'dependencies.dependency.systemPath' for com.sun:tools:jar refers to a non-existing file /opt/java/openjdk/../lib/tools.jar. Please verify that you run Maven using a JDK and not just a JRE. @ org.javassist:javassist:3.18.1-GA
[DEBUG] Dependency collection stats {ConflictMarker.analyzeTime=176654, ConflictMarker.markTime=178040, ConflictMarker.nodeCount=595, ConflictIdSorter.graphTime=122262, ConflictIdSorter.topsortTime=59600, ConflictIdSorter.conflictIdCount=100, ConflictIdSorter.conflictIdCycleCount=0, ConflictResolver.totalTime=1975727, ConflictResolver.conflictItemCount=293, DfDependencyCollector.collectTime=12015988, DfDependencyCollector.transformTime=2550636}
[WARNING] 1 problem was encountered while building the effective model for org.javassist:javassist::3.18.1-GA during n/a
Problem
* 'dependencies.dependency.systemPath' for com.sun:tools:jar refers to a non-existing file /opt/java/openjdk/../lib/tools.jar. Please verify that you run Maven using a JDK and not just a JRE. @ org.javassist:javassist:3.18.1-GA
[WARNING] 1 problem was encountered while building the effective model for org.javassist:javassist::3.18.1-GA during n/a
Problem
* 'dependencies.dependency.systemPath' for com.sun:tools:jar refers to a non-existing file /opt/java/openjdk/../lib/tools.jar. Please verify that you run Maven using a JDK and not just a JRE. @ org.javassist:javassist:3.18.1-GA
[WARNING] 1 problem was encountered while building the effective model for org.javassist:javassist::3.18.1-GA during n/a
Problem
* 'dependencies.dependency.systemPath' for com.sun:tools:jar refers to a non-existing file /opt/java/openjdk/../lib/tools.jar. Please verify that you run Maven using a JDK and not just a JRE. @ org.javassist:javassist:3.18.1-GA

To comparision the cycloneDX plugin can resolve it a little better ´(also the missing ??? after "for") as it seems. There it's only stated once:

[INFO] --- cyclonedx:2.9.1:makeAggregateBom (default) @ MYONE ---

[...]

[INFO] CycloneDX: Resolving Aggregated Dependencies

[...]

[DEBUG] Writing tracking file '/root/.m2/repository/org/javassist/javassist/3.18.1-GA/_remote.repositories'
[DEBUG] Writing tracking file '/root/.m2/repository/org/javassist/javassist/3.18.1-GA/javassist-3.18.1-GA.pom.lastUpdated'
[WARNING] 1 problem was encountered while building the effective model for org.javassist:javassist:jar:3.18.1-GA during dependency collection step for . Path to offending node from root:
 -> MYONE 
 -> org.hibernate:hibernate-entitymanager:jar:4.3.9.Final (compile)
 -> org.hibernate:hibernate-core:jar:4.3.9.Final (compile)
 => org.javassist:javassist:jar:3.18.1-GA (compile)
Problem
* 'dependencies.dependency.systemPath' for com.sun:tools:jar refers to a non-existing file /opt/java/openjdk/../lib/tools.jar. Please verify that you run Maven using a JDK and not just a JRE. @ org.javassist:javassist:3.18.1-GA

So I think there are things missing in the message output.

(Regardless that I have no clue how to fix the error of with that JDK). The JDK used in the container is temurin 17 (and 21 - we do two builds in a sequential line of Jenkins steps to verify build on 17 and 21)