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https://issues.apache.org/jira/browse/MNG-7449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17522315#comment-17522315
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Michael Osipov commented on MNG-7449:
-------------------------------------
We are waiting for [~redelang] to answer.
> [REGRESSION] StringVisitorModelInterpolator NullPointerException
> ----------------------------------------------------------------
>
> Key: MNG-7449
> URL: https://issues.apache.org/jira/browse/MNG-7449
> Project: Maven
> Issue Type: Bug
> Components: Inheritance and Interpolation
> Affects Versions: 3.8.5
> Reporter: Ronnie de Lang
> Priority: Major
> Fix For: wontfix-candidate
>
>
> Since Maven 3.8.5 our own custom Maven plugin is failing with a
> NullPointerException when trying to interpolate Maven properties in a Maven
> model.
> Code:
> {code:java}
> StringVisitorModelInterpolator interpolator = new
> StringVisitorModelInterpolator();
> interpolated = interpolator.interpolateModel(model, null, new
> DefaultModelBuildingRequest(), new ModelProblemCollector() {
> @Override
> public void add(ModelProblemCollectorRequest
> modelProblemCollectorRequest) {
> problems.add(modelProblemCollectorRequest);
> }
> }); {code}
> Stacktrace:
> {code:java}
> [ERROR] Failed to execute goal
> nl.ing.cis.tools.deploy:deploy-configuration-maven-plugin:5.2.0:flatten
> (default) on project DNL_PMDM_HelloYou: Execution default of goal
> nl.ing.cis.tools.deploy:deploy-configuration-maven-plugin:5.2.0:flatten
> failed.: NullPointerException -> [Help 1]
> org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute
> goal nl.ing.cis.tools.deploy:deploy-configuration-maven-plugin:5.2.0:flatten
> (default) on project DNL_PMDM_HelloYou: Execution default of goal
> nl.ing.cis.tools.deploy:deploy-configuration-maven-plugin:5.2.0:flatten
> failed.
> at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute
> (MojoExecutor.java:306)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:211)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:165)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:157)
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject
> (LifecycleModuleBuilder.java:121)
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject
> (LifecycleModuleBuilder.java:81)
> at
> org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build
> (SingleThreadedBuilder.java:56)
> at org.apache.maven.lifecycle.internal.LifecycleStarter.execute
> (LifecycleStarter.java:127)
> at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:294)
> at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
> at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
> at org.apache.maven.cli.MavenCli.execute (MavenCli.java:960)
> at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:293)
> at org.apache.maven.cli.MavenCli.main (MavenCli.java:196)
> at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke
> (NativeMethodAccessorImpl.java:62)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke
> (DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke (Method.java:498)
> at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced
> (Launcher.java:282)
> at org.codehaus.plexus.classworlds.launcher.Launcher.launch
> (Launcher.java:225)
> at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode
> (Launcher.java:406)
> at org.codehaus.plexus.classworlds.launcher.Launcher.main
> (Launcher.java:347)
> Caused by: org.apache.maven.plugin.PluginExecutionException: Execution
> default of goal
> nl.ing.cis.tools.deploy:deploy-configuration-maven-plugin:5.2.0:flatten
> failed.
> at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo
> (DefaultBuildPluginManager.java:148)
> at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute
> (MojoExecutor.java:301)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:211)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:165)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:157)
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject
> (LifecycleModuleBuilder.java:121)
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject
> (LifecycleModuleBuilder.java:81)
> at
> org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build
> (SingleThreadedBuilder.java:56)
> at org.apache.maven.lifecycle.internal.LifecycleStarter.execute
> (LifecycleStarter.java:127)
> at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:294)
> at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
> at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
> at org.apache.maven.cli.MavenCli.execute (MavenCli.java:960)
> at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:293)
> at org.apache.maven.cli.MavenCli.main (MavenCli.java:196)
> at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke
> (NativeMethodAccessorImpl.java:62)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke
> (DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke (Method.java:498)
> at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced
> (Launcher.java:282)
> at org.codehaus.plexus.classworlds.launcher.Launcher.launch
> (Launcher.java:225)
> at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode
> (Launcher.java:406)
> at org.codehaus.plexus.classworlds.launcher.Launcher.main
> (Launcher.java:347)
> Caused by: java.lang.NullPointerException
> at
> org.apache.maven.model.interpolation.AbstractStringBasedModelInterpolator.createValueSources
> (AbstractStringBasedModelInterpolator.java:165)
> at
> org.apache.maven.model.interpolation.StringVisitorModelInterpolator.interpolateModel
> (StringVisitorModelInterpolator.java:101)
> at
> nl.ing.cis.tools.tibcodeploy.utils.maven.PropertiesInterpolator.interpolateProperties
> (PropertiesInterpolator.java:87)
> at nl.ing.cis.tools.deploy.build.common.AbstractBuilder.replaceProperties
> (AbstractBuilder.java:236)
> at
> nl.ing.cis.tools.deploy.build.common.AbstractBuilder.replacePropertiesInXml
> (AbstractBuilder.java:261)
> at
> nl.ing.cis.tools.deploy.build.flattenedbindings.FlattenedBindingsBuilder.prefetchDtlScmResources
> (FlattenedBindingsBuilder.java:683)
> at
> nl.ing.cis.tools.deploy.build.flattenedbindings.FlattenedBindingsBuilder.build
> (FlattenedBindingsBuilder.java:91)
> at nl.ing.cis.tools.deploy.configuration.maven.FlattenMojo.buildBindings
> (FlattenMojo.java:140)
> at nl.ing.cis.tools.deploy.configuration.maven.FlattenMojo.doFlatten
> (FlattenMojo.java:122)
> at nl.ing.cis.tools.deploy.configuration.maven.FlattenMojo.execute
> (FlattenMojo.java:101)
> at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo
> (DefaultBuildPluginManager.java:137)
> at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute
> (MojoExecutor.java:301)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:211)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:165)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:157)
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject
> (LifecycleModuleBuilder.java:121)
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject
> (LifecycleModuleBuilder.java:81)
> at
> org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build
> (SingleThreadedBuilder.java:56)
> at org.apache.maven.lifecycle.internal.LifecycleStarter.execute
> (LifecycleStarter.java:127)
> at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:294)
> at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
> at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
> at org.apache.maven.cli.MavenCli.execute (MavenCli.java:960)
> at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:293)
> at org.apache.maven.cli.MavenCli.main (MavenCli.java:196)
> at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke
> (NativeMethodAccessorImpl.java:62)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke
> (DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke (Method.java:498)
> at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced
> (Launcher.java:282)
> at org.codehaus.plexus.classworlds.launcher.Launcher.launch
> (Launcher.java:225)
> at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode
> (Launcher.java:406)
> at org.codehaus.plexus.classworlds.launcher.Launcher.main
> (Launcher.java:347) {code}
> When analysing the issue it showed that the NullPointerException is caused
> because the AbstractStringBasedModelInterpolator tries to use the newly
> introduced ModelVersionProcessor, but the member is null.
> Programmatically providing the interpolator with an instance of the default
> ModelVersionProcessor class solves this issue. But that is not backwards
> compatible as this class is new in Maven 3.8.5.
> {code:java}
> interpolator.setVersionPropertiesProcessor(new
> DefaultModelVersionProcessor()); {code}
> Is this a bug, or am I doing something wrong here?
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