Check that all <item> elements in your site.xml have a href, see http://jira.codehaus.org/browse/MSITE-619
HTH, -Lukas Thomas Scheffler wrote:
Hi, I'm having issues with "mvn site" resulting in a NullPointer exception. Could someone give me a hint what can cause these exceptions? regards Thomas [INFO] Generating "Developer Activity" report --- maven-changelog-plugin:2.2 [INFO] Using existing changelog.xml... [DEBUG] Multipage report: 0 subreports [DEBUG] Velocimacro : added #link( href name target img position alt border width height ) : source = org/apache/maven/doxia/siterenderer/resources/default-site.vm [DEBUG] Velocimacro : added #image( img alt border width height ) : source = org/apache/maven/doxia/siterenderer/resources/default-site.vm [DEBUG] Velocimacro : added #banner( banner id ) : source = org/apache/maven/doxia/siterenderer/resources/default-site.vm [DEBUG] Velocimacro : added #links( links ) : source = org/apache/maven/doxia/siterenderer/resources/default-site.vm [DEBUG] Velocimacro : added #breadcrumbs( breadcrumbs ) : source = org/apache/maven/doxia/siterenderer/resources/default-site.vm [DEBUG] Velocimacro : added #displayTree( display item ) : source = org/apache/maven/doxia/siterenderer/resources/default-site.vm [DEBUG] Velocimacro : added #menuItem( item ) : source = org/apache/maven/doxia/siterenderer/resources/default-site.vm [DEBUG] Velocimacro : added #mainMenu( menus ) : source = org/apache/maven/doxia/siterenderer/resources/default-site.vm [DEBUG] Velocimacro : added #copyright( ) : source = org/apache/maven/doxia/siterenderer/resources/default-site.vm [DEBUG] Velocimacro : added #publishDate( position publishDate version ) : source = org/apache/maven/doxia/siterenderer/resources/default-site.vm [DEBUG] Velocimacro : added #poweredByLogo( poweredBy ) : source = org/apache/maven/doxia/siterenderer/resources/default-site.vm [DEBUG] Velocimacro : added #googleAnalytics( accountId ) : source = org/apache/maven/doxia/siterenderer/resources/default-site.vm [ERROR] Method calculateLink threw exception for reference $PathTool in template org/apache/maven/doxia/siterenderer/resources/default-site.vm at [2,29] [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 4.564s [INFO] Finished at: Wed Jan 18 10:18:07 CET 2012 [INFO] Final Memory: 26M/618M [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.apache.maven.plugins:maven-site-plugin:3.0:site (default-site) on project mycore-parent: Error during page generation: Error while generating code. Invocation of method 'calculateLink' in class org.codehaus.plexus.util.PathTool threw exception java.lang.NullPointerException @ org/apache/maven/doxia/siterenderer/resources/default-site.vm[2,39] -> [Help 1] org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-site-plugin:3.0:site (default-site) on project mycore-parent: Error during page generation at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:217) 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:84) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59) at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:319) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156) at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537) at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196) at org.apache.maven.cli.MavenCli.main(MavenCli.java:141) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409) at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352) Caused by: org.apache.maven.plugin.MojoExecutionException: Error during page generation at org.apache.maven.plugins.site.SiteMojo.execute(SiteMojo.java:143) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209) ... 19 more Caused by: org.apache.maven.doxia.siterenderer.RendererException: Error while generating code. at org.apache.maven.doxia.siterenderer.DefaultSiteRenderer.processTemplate(DefaultSiteRenderer.java:566) at org.apache.maven.doxia.siterenderer.DefaultSiteRenderer.writeTemplate(DefaultSiteRenderer.java:530) at org.apache.maven.doxia.siterenderer.DefaultSiteRenderer.generateDocument(DefaultSiteRenderer.java:509) at org.apache.maven.plugins.site.ReportDocumentRenderer.renderDocument(ReportDocumentRenderer.java:283) at org.apache.maven.doxia.siterenderer.DefaultSiteRenderer.renderModule(DefaultSiteRenderer.java:317) at org.apache.maven.doxia.siterenderer.DefaultSiteRenderer.render(DefaultSiteRenderer.java:134) at org.apache.maven.plugins.site.SiteMojo.renderLocale(SiteMojo.java:175) at org.apache.maven.plugins.site.SiteMojo.execute(SiteMojo.java:138) ... 21 more Caused by: org.apache.velocity.exception.MethodInvocationException: Invocation of method 'calculateLink' in class org.codehaus.plexus.util.PathTool threw exception java.lang.NullPointerException @ org/apache/maven/doxia/siterenderer/resources/default-site.vm[2,39] at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:286) at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:203) at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:419) at org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:73) at org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:125) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318) at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:194) at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74) at org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:448) at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74) at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:88) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74) at org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:448) at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318) at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:194) at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170) at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318) at org.apache.velocity.Template.merge(Template.java:254) at org.apache.maven.doxia.siterenderer.DefaultSiteRenderer.processTemplate(DefaultSiteRenderer.java:562) ... 28 more Caused by: java.lang.NullPointerException at org.codehaus.plexus.util.PathTool.calculateLink(PathTool.java:197) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:295) at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:245) ... 49 more [ERROR] [ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
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