garydgregory opened a new issue, #130:
URL: https://github.com/apache/maven-changes-plugin/issues/130
### Affected version
3.0.0-M3
### Bug description
Whatever the actual problem is, the plugin should log an actionable error
message instead of throwing a `NullPointerException`.
```
auncher.Launcher.launch (Launcher.java:201)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode
(Launcher.java:361)
at org.codehaus.plexus.classworlds.launcher.Launcher.main
(Launcher.java:314)
Caused by: java.lang.NullPointerException: Cannot invoke
"java.lang.CharSequence.toString()" because "target" is null
at java.lang.String.replace (String.java:3085)
at jdk.internal.reflect.DirectMethodHandleAccessor.invoke
(DirectMethodHandleAccessor.java:103)
at java.lang.reflect.Method.invoke (Method.java:580)
at
org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke
(UberspectImpl.java:571)
at
org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke
(UberspectImpl.java:554)
at org.apache.velocity.runtime.parser.node.ASTMethod.execute
(ASTMethod.java:221)
at org.apache.velocity.runtime.parser.node.ASTReference.execute
(ASTReference.java:368)
at org.apache.velocity.runtime.parser.node.ASTReference.value
(ASTReference.java:704)
at org.apache.velocity.runtime.parser.node.ASTExpression.value
(ASTExpression.java:75)
at org.apache.velocity.runtime.parser.node.ASTSetDirective.render
(ASTSetDirective.java:242)
at org.apache.velocity.runtime.parser.node.SimpleNode.render
(SimpleNode.java:439)
at org.apache.velocity.Template.merge (Template.java:358)
at org.apache.velocity.Template.merge (Template.java:262)
at
org.apache.maven.plugins.changes.announcement.AnnouncementMojo.processTemplate
(AnnouncementMojo.java:624)
at
org.apache.maven.plugins.changes.announcement.AnnouncementMojo.doGenerate
(AnnouncementMojo.java:579)
at
org.apache.maven.plugins.changes.announcement.AnnouncementMojo.doGenerate
(AnnouncementMojo.java:536)
at
org.apache.maven.plugins.changes.announcement.AnnouncementMojo.execute
(AnnouncementMojo.java:519)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo
(DefaultBuildPluginManager.java:126)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2
(MojoExecutor.java:328)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute
(MojoExecutor.java:316)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute
(MojoExecutor.java:212)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute
(MojoExecutor.java:174)
at org.apache.maven.lifecycle.internal.MojoExecutor.access$000
(MojoExecutor.java:75)
at org.apache.maven.lifecycle.internal.MojoExecutor$1.run
(MojoExecutor.java:162)
at org.apache.maven.plugin.DefaultMojosExecutionStrategy.execute
(DefaultMojosExecutionStrategy.java:39)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute
(MojoExecutor.java:159)
at
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject
(LifecycleModuleBuilder.java:105)
at
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject
(LifecycleModuleBuilder.java:73)
at
org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build
(SingleThreadedBuilder.java:53)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute
(LifecycleStarter.java:118)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:261)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:173)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:101)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:906)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:283)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:206)
at jdk.internal.reflect.DirectMethodHandleAccessor.invoke
(DirectMethodHandleAccessor.java:103)
at java.lang.reflect.Method.invoke (Method.java:580)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced
(Launcher.java:255)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch
(Launcher.java:201)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode
(Launcher.java:361)
at org.codehaus.plexus.classworlds.launcher.Launcher.main
(Launcher.java:314)
```
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