Archie Cobbs created MJAVADOC-448:
-------------------------------------
Summary: Emit better error message for simple XML typos
Key: MJAVADOC-448
URL: https://issues.apache.org/jira/browse/MJAVADOC-448
Project: Maven Javadoc Plugin
Issue Type: Improvement
Affects Versions: 2.9.1
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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