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Posted to issues@maven.apache.org by "Elliotte Rusty Harold (Jira)" <ji...@apache.org> on 2019/12/16 12:17:00 UTC
[jira] [Commented] (MNG-6004) Emit better error message for simple
XML typos
[ https://issues.apache.org/jira/browse/MNG-6004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16997225#comment-16997225 ]
Elliotte Rusty Harold commented on MNG-6004:
--------------------------------------------
Yes, this could be done. Ideally we won't use JAXB at all, (deprecated in java 9+ and it was not a good idea in the first place) but short of ripping it out and replacing it with something better, we could add a preprocessing validation step with better error messages.
> Emit better error message for simple XML typos
> ----------------------------------------------
>
> Key: MNG-6004
> URL: https://issues.apache.org/jira/browse/MNG-6004
> Project: Maven
> Issue Type: Improvement
> Affects Versions: 3.3.9
> Environment: Maven 3.2.5
> Reporter: Archie Cobbs
> Priority: Minor
>
> When porting a project from ant to maven, I accidentally said this:
> {noformat}
> <configuration>
> <links>
> <link href="http://www.slf4j.org/api/"/>
> </links>
> </configuration>
> {noformat}
> instead of this:
> {noformat}
> <configuration>
> <links>
> <link>http://www.slf4j.org/api/</link>
> </links>
> </configuration>
> {noformat}
> Easy enough mistake to make. However, the error message was utterly mystifying:
> {noformat}
> [ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:2.9.1:jar (attach-javadocs) on project msrp4j: Execution attach-javadocs of goal org.apache.maven.plugins:maven-javadoc-plugin:2.9.1:jar failed. NullPointerException -> [Help 1]
> org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:2.9.1:jar (attach-javadocs) on project msrp4j: Execution attach-javadocs of goal org.apache.maven.plugins:maven-javadoc-plugin:2.9.1:jar failed.
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:224)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
> at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
> at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
> at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
> at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:120)
> at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:355)
> at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:155)
> at org.apache.maven.cli.MavenCli.execute(MavenCli.java:584)
> at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:216)
> at org.apache.maven.cli.MavenCli.main(MavenCli.java:160)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
> at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
> at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
> at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
> Caused by: org.apache.maven.plugin.PluginExecutionException: Execution attach-javadocs of goal org.apache.maven.plugins:maven-javadoc-plugin:2.9.1:jar failed.
> at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:143)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
> ... 19 more
> Caused by: java.lang.NullPointerException
> at org.codehaus.plexus.util.xml.pull.MXSerializer.writeElementContent(MXSerializer.java:921)
> at org.codehaus.plexus.util.xml.pull.MXSerializer.text(MXSerializer.java:785)
> at org.apache.maven.plugin.javadoc.options.io.xpp3.JavadocOptionsXpp3Writer.writeJavadocOptions(JavadocOptionsXpp3Writer.java:268)
> at org.apache.maven.plugin.javadoc.options.io.xpp3.JavadocOptionsXpp3Writer.write(JavadocOptionsXpp3Writer.java:70)
> at org.apache.maven.plugin.javadoc.AbstractJavadocMojo.buildJavadocOptions(AbstractJavadocMojo.java:5867)
> at org.apache.maven.plugin.javadoc.AbstractJavadocMojo.executeReport(AbstractJavadocMojo.java:1857)
> at org.apache.maven.plugin.javadoc.JavadocJar.execute(JavadocJar.java:181)
> at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:132)
> ... 20 more
> {noformat}
> Suggestion: include code that performs basic structural checks so as to make it impossible for a cryptic {{NullPointerException}} to occur simply due to incorrect POM input.
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