[jira] [Commented] (MNG-7318) NullPointerException during mvn install when property is called "project.version"

["Daniel Langerenken (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MNG-7318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17453259#comment-17453259 ] 

Daniel Langerenken commented on MNG-7318:
-----------------------------------------

Seems to be resolved in 3.8.4. I'm now seeing a proper error message:
{code:java}
 Resolving expression: '${project.version}': Detected the following recursive expression cycle in 'project.version': [version, revision] @ org.example:foo:${revision}, /experiment/pom.xml -> [Help 2] {code}

> NullPointerException during mvn install when property is called "project.version"
> ---------------------------------------------------------------------------------
>
>                 Key: MNG-7318
>                 URL: https://issues.apache.org/jira/browse/MNG-7318
>             Project: Maven
>          Issue Type: Bug
>          Components: Command Line, Inheritance and Interpolation
>    Affects Versions: 3.6.3
>         Environment: Apache Maven 3.6.3
> Maven home: /usr/share/maven
> Java version: 1.8.0_221, vendor: Oracle Corporation, runtime: /usr/lib/jvm/jdk1.8.0_221/jre
> Default locale: en_US, platform encoding: UTF-8
> OS name: "linux", version: "5.11.0-38-generic", arch: "amd64", family: "unix"
>            Reporter: Daniel Langerenken
>            Priority: Major
>
> Use the following (simplified) pom.xml and run mvn install:
> {code:java}
> <?xml version="1.0" encoding="UTF-8"?>
> <project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
>   <modelVersion>4.0.0</modelVersion>
>   <groupId>org.example</groupId>
>   <artifactId>foo</artifactId>
>   <version>${revision}</version>
>   <properties>
>     <project.version>1.0</project.version>
>     <revision>${project.version}</revision>
>   </properties>
> </project>{code}
> It will throw the following exception:
> {code:java}
>  [ERROR] Internal error: java.lang.NullPointerException -> [Help 1]
> org.apache.maven.InternalErrorException: Internal error: java.lang.NullPointerException
>     at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:120)
>     at org.apache.maven.cli.MavenCli.execute (MavenCli.java:957)
>     at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:289)
>     at org.apache.maven.cli.MavenCli.main (MavenCli.java:193)
>     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 java.util.Hashtable$Entry.setValue (Hashtable.java:1286)
>     at org.apache.maven.model.interpolation.StringVisitorModelInterpolator$ModelVisitor.visit (StringVisitorModelInterpolator.java:1429)
>     at org.apache.maven.model.interpolation.StringVisitorModelInterpolator$ModelVisitor.visit (StringVisitorModelInterpolator.java:1027)
>     at org.apache.maven.model.interpolation.StringVisitorModelInterpolator$ModelVisitor.visit (StringVisitorModelInterpolator.java:170)
>     at org.apache.maven.model.interpolation.StringVisitorModelInterpolator.interpolateModel (StringVisitorModelInterpolator.java:107)
>     at org.apache.maven.model.building.DefaultModelBuilder.interpolateModel (DefaultModelBuilder.java:789)
>     at org.apache.maven.model.building.DefaultModelBuilder.build (DefaultModelBuilder.java:393)
>     at org.apache.maven.project.DefaultProjectBuilder.build (DefaultProjectBuilder.java:448)
>     at org.apache.maven.project.DefaultProjectBuilder.build (DefaultProjectBuilder.java:414)
>     at org.apache.maven.project.DefaultProjectBuilder.build (DefaultProjectBuilder.java:377)
>     at org.apache.maven.graph.DefaultGraphBuilder.collectProjects (DefaultGraphBuilder.java:414)
>     at org.apache.maven.graph.DefaultGraphBuilder.getProjectsForMavenReactor (DefaultGraphBuilder.java:405)
>     at org.apache.maven.graph.DefaultGraphBuilder.build (DefaultGraphBuilder.java:82)
>     at org.apache.maven.DefaultMaven.buildGraph (DefaultMaven.java:507)
>     at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:219)
>     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:957)
>     at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:289)
>     at org.apache.maven.cli.MavenCli.main (MavenCli.java:193){code}
> This is only happening when I name the property `*project.version*` indicating that this might be an illegal name. I can switch it to `*project.ver*` and it works fine.
> This should not throw a NullPointerException but instead either work or throw an appropriate exception.



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