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https://issues.apache.org/jira/browse/MJAVADOC-504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16308853#comment-16308853
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Emmanuel Bourg commented on MJAVADOC-504:
-----------------------------------------
I tried with the fix in commit 7505bb5 but it still triggers the same
NullPointerException (javaHomeValue is null at line 1308). Maybe because the
value of java.home is read from the environment variables instead of the system
properties of the JVM?
> NullPointerException in JavadocUtil.getJavaHome() when JAVA_HOME isn't set
> --------------------------------------------------------------------------
>
> Key: MJAVADOC-504
> URL: https://issues.apache.org/jira/browse/MJAVADOC-504
> Project: Maven Javadoc Plugin
> Issue Type: Bug
> Affects Versions: 3.0.0
> Environment: Debian, OpenJDK 8
> Reporter: Emmanuel Bourg
>
> Hi,
> After upgrading to maven-javadoc-plugin I noticed a NullPointerException in
> {{JavadocUtil.getJavaHome()}} when the JAVA_HOME environment variable isn't
> set:
> {noformat}
> java.lang.NullPointerException
> at java.io.File.<init> (File.java:277)
> at org.apache.maven.plugins.javadoc.JavadocUtil.getJavaHome
> (JavadocUtil.java:1302)
> at org.apache.maven.plugins.javadoc.JavadocUtil.invokeMaven
> (JavadocUtil.java:941)
> at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.getModulesLinks
> (AbstractJavadocMojo.java:5640)
> at
> org.apache.maven.plugins.javadoc.AbstractJavadocMojo.addLinkofflineArguments
> (AbstractJavadocMojo.java:4046)
> at
> org.apache.maven.plugins.javadoc.AbstractJavadocMojo.addStandardDocletOptions
> (AbstractJavadocMojo.java:4936)
> at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.executeReport
> (AbstractJavadocMojo.java:2074)
> at org.apache.maven.plugins.javadoc.JavadocReport.generate
> (JavadocReport.java:134)
> at org.apache.maven.plugins.javadoc.JavadocReport.doExecute
> (JavadocReport.java:329)
> at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.execute
> (AbstractJavadocMojo.java:1909)
> at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo
> (DefaultBuildPluginManager.java:134)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:208)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:154)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute
> (MojoExecutor.java:146)
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject
> (LifecycleModuleBuilder.java:117)
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject
> (LifecycleModuleBuilder.java:81)
> at
> org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build
> (SingleThreadedBuilder.java:51)
> at org.apache.maven.lifecycle.internal.LifecycleStarter.execute
> (LifecycleStarter.java:128)
> at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:309)
> at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:194)
> at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:107)
> at org.apache.maven.cli.MavenCli.execute (MavenCli.java:993)
> at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:345)
> at org.apache.maven.cli.MavenCli.main (MavenCli.java:191)
> at org.apache.maven.cli.MavenCli.main (MavenCli.java:180)
> {noformat}
> This error doesn't occur with the version 3.0.0-M1 or when JAVA_HOME is set.
> It can be reproduced on the byte-buddy project:
> {code}
> git clone https://github.com/raphw/byte-buddy
> cd byte-buddy
> git checkout byte-buddy-1.7.9
> mvn org.apache.maven.plugins:maven-javadoc-plugin:3.0.0:javadoc
> {code}
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