I use maven-2.1.0, jdk1.5.0_11, encoding cp1252 on windows xpsp2.

FATAL: Unable to copy Javadoc from C:\hudson\jobs\vote-io-trunk\workspace\trunk\target\site\apidocs to C:\hudson\jobs\vote-io-trunk\modules\voxaly$vote-io\javadoc
hudson.util.IOException2: java.io.IOException: Not in GZIP format
	at hudson.FilePath.copyRecursiveTo(FilePath.java:1091)
	at hudson.FilePath.copyRecursiveTo(FilePath.java:1018)
	at hudson.maven.reporters.MavenJavadocArchiver.postExecute(MavenJavadocArchiver.java:88)
	at hudson.maven.reporters.MavenJavadocArchiver.reportGenerated(MavenJavadocArchiver.java:107)
	at hudson.maven.MavenModuleSetBuild$Builder.onReportGenerated(MavenModuleSetBuild.java:648)
	at hudson.maven.MavenBuilder$Adapter.onReportGenerated(MavenBuilder.java:296)
	at hudson.maven.agent.PluginManagerInterceptor$3.invoke(PluginManagerInterceptor.java:231)
	at $Proxy2.generate(Unknown Source)
	at org.apache.maven.plugins.site.ReportDocumentRenderer.renderDocument(ReportDocumentRenderer.java:139)
	at org.apache.maven.doxia.siterenderer.DefaultSiteRenderer.renderModule(DefaultSiteRenderer.java:269)
	at org.apache.maven.doxia.siterenderer.DefaultSiteRenderer.render(DefaultSiteRenderer.java:101)
	at org.apache.maven.plugins.site.SiteMojo.renderLocale(SiteMojo.java:129)
	at org.apache.maven.plugins.site.SiteMojo.execute(SiteMojo.java:96)
	at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:451)
	at hudson.maven.agent.PluginManagerInterceptor.executeMojo(PluginManagerInterceptor.java:182)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:558)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:499)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:478)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:330)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:291)
	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:142)
	at org.apache.maven.lifecycle.LifecycleExecutorInterceptor.execute(LifecycleExecutorInterceptor.java:65)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:336)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:129)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:287)
	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.classworlds.Launcher.launchEnhanced(Launcher.java:315)
	at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
	at hudson.maven.agent.Main.launch(Main.java:158)
	at hudson.maven.MavenBuilder.call(MavenBuilder.java:162)
	at hudson.maven.MavenModuleSetBuild$Builder.call(MavenModuleSetBuild.java:577)
	at hudson.maven.MavenModuleSetBuild$Builder.call(MavenModuleSetBuild.java:523)
	at hudson.remoting.UserRequest.perform(UserRequest.java:92)
	at hudson.remoting.UserRequest.perform(UserRequest.java:46)
	at hudson.remoting.Request$2.run(Request.java:236)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
	at java.lang.Thread.run(Thread.java:619)
Caused by: java.util.concurrent.ExecutionException: java.io.IOException: Not in GZIP format
	at hudson.remoting.Channel$1.adapt(Channel.java:514)
	at hudson.remoting.Channel$1.adapt(Channel.java:509)
	at hudson.remoting.FutureAdapter.get(FutureAdapter.java:55)
	at hudson.FilePath.copyRecursiveTo(FilePath.java:1089)
	... 43 more
Caused by: java.io.IOException: Not in GZIP format
	at java.util.zip.GZIPInputStream.readHeader(GZIPInputStream.java:132)
	at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:58)
	at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:68)
	at hudson.FilePath$27.invoke(FilePath.java:1080)
	at hudson.FilePath$27.invoke(FilePath.java:1077)
	at hudson.FilePath$FileCallableWrapper.call(FilePath.java:1510)
	at hudson.remoting.UserRequest.perform(UserRequest.java:92)
	at hudson.remoting.UserRequest.perform(UserRequest.java:46)
	at hudson.remoting.Request$2.run(Request.java:236)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:417)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:269)
	at java.util.concurrent.FutureTask.run(FutureTask.java:123)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
	at java.lang.Thread.run(Thread.java:595)