The Doxygen publishing part fails with:

Publishing Doxygen HTML results.
The determined Doxygen directory is '/var/lib/jenkins/workspace/ezp-next2/build/api/html'.
FATAL: error
hudson.util.IOException2: java.io.IOException: Unconnected pipe
at hudson.remoting.FastPipedInputStream.read(FastPipedInputStream.java:160)
at hudson.util.HeadBufferingStream.read(HeadBufferingStream.java:61)
at java.io.FilterInputStream.read(FilterInputStream.java:90)
at hudson.util.HeadBufferingStream.fillSide(HeadBufferingStream.java:83)
at hudson.FilePath$TarCompression$2.extract(FilePath.java:538)
at hudson.FilePath.copyRecursiveTo(FilePath.java:1566)
at hudson.FilePath.copyRecursiveTo(FilePath.java:1474)
at hudson.plugins.doxygen.DoxygenArchiver._perform(DoxygenArchiver.java:231)
at hudson.plugins.doxygen.DoxygenArchiver.perform(DoxygenArchiver.java:176)
at hudson.tasks.BuildStepMonitor$2.perform(BuildStepMonitor.java:27)
at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:682)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:657)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:635)
at hudson.model.Build$RunnerImpl.post2(Build.java:161)
at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:604)
at hudson.model.Run.run(Run.java:1400)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:175)

at hudson.FilePath.copyRecursiveTo(FilePath.java:1573)
at hudson.FilePath.copyRecursiveTo(FilePath.java:1474)
at hudson.plugins.doxygen.DoxygenArchiver._perform(DoxygenArchiver.java:231)
at hudson.plugins.doxygen.DoxygenArchiver.perform(DoxygenArchiver.java:176)
at hudson.tasks.BuildStepMonitor$2.perform(BuildStepMonitor.java:27)
at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:682)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:657)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:635)
at hudson.model.Build$RunnerImpl.post2(Build.java:161)
at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:604)
at hudson.model.Run.run(Run.java:1400)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:175)
Caused by: java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:232)
at java.util.concurrent.FutureTask.get(FutureTask.java:91)
at hudson.remoting.LocalChannel$2.get(LocalChannel.java:81)
at hudson.FilePath.copyRecursiveTo(FilePath.java:1569)
... 13 more
Caused by: java.lang.NullPointerException
at hudson.FilePath$33.invoke(FilePath.java:1561)
at hudson.FilePath$33.invoke(FilePath.java:1556)
at hudson.FilePath$FileCallableWrapper.call(FilePath.java:1980)
at hudson.remoting.LocalChannel$1.call(LocalChannel.java:52)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Build step 'Publish Doxygen' changed build result to FAILURE

The generation of the documentation is successfully done as a "doxygen" task made in the build.xml ant file.

Note sure to know the difference between Doxygen publishing and "Publish HTML reports" configured with the output directory of Doxygen.

Doxyfile is in attachment.