Also I’m getting this when I try compile the project using Java 8. Maybe is a good idea add Java 8 on travis build.

[ERROR] The given File link: /Users/passos/Development/Projects/AeroGear/aerogear-unifiedpush-server/jaxrs/../target/site/apidocs is not a dir.
[ERROR] Error fetching link: /Users/passos/Development/Projects/AeroGear/aerogear-unifiedpush-server/jaxrs/../target/site/apidocs/package-list. Ignored it.
[INFO] 
Loading source files for package org.jboss.aerogear.unifiedpush.rest...
Loading source files for package org.jboss.aerogear.unifiedpush.rest.annotations...
Loading source files for package org.jboss.aerogear.unifiedpush.rest.registry.installations...
Loading source files for package org.jboss.aerogear.unifiedpush.rest.sender...
Constructing Javadoc information...
1 error
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO] 
[INFO] AeroGear UnifiedPush Server ....................... SUCCESS [1.981s]
[INFO] UnifiedPush Model Layer ........................... SUCCESS [0.052s]
[INFO] UnifiedPush Server Model API ...................... SUCCESS [3.359s]
[INFO] UnifiedPush Server Model JPA implementation ....... SUCCESS [16.161s]
[INFO] UnifiedPush Service Layer ......................... SUCCESS [21.848s]
[INFO] UnifiedPush Push Notification Networks ............ SUCCESS [3.745s]
[INFO] UnifiedPush RESTful Endpoint ...................... FAILURE [2.425s]
[INFO] UnifiedPush Server (Admin UI) ..................... SKIPPED
[INFO] UnifiedPush Dependencies Parent ................... SKIPPED
[INFO] UnifiedPush Server Dependencies Server ............ SKIPPED
[INFO] UnifiedPush Auth Server ........................... SKIPPED
[INFO] UnifiedPush Server for JBossAS (WAR) .............. SKIPPED
[INFO] UnifiedPush Server for Wildfly (WAR) .............. SKIPPED
[INFO] UnifiedPush Servers Parent ........................ SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 50.770s
[INFO] Finished at: Tue Oct 21 09:35:48 BRST 2014
[INFO] Final Memory: 88M/716M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:2.9:javadoc (jax-rs-docs) on project unifiedpush-jaxrs: An error has occurred in JavaDocs report generation:
[ERROR] Exit code: 1 - javadoc: error - In doclet class com.lunatech.doclets.jax.jaxrs.JAXRSDoclet,  method start has thrown an exception java.lang.reflect.InvocationTargetException
[ERROR] java.lang.NullPointerException
[ERROR] at com.lunatech.doclets.jax.jaxrs.JAXRSDoclet.<init>(JAXRSDoclet.java:84)
[ERROR] at com.lunatech.doclets.jax.jaxrs.JAXRSDoclet.start(JAXRSDoclet.java:78)
[ERROR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[ERROR] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[ERROR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[ERROR] at java.lang.reflect.Method.invoke(Method.java:483)
[ERROR] at com.sun.tools.javadoc.DocletInvoker.invoke(DocletInvoker.java:310)
[ERROR] at com.sun.tools.javadoc.DocletInvoker.start(DocletInvoker.java:189)
[ERROR] at com.sun.tools.javadoc.Start.parseAndExecute(Start.java:366)
[ERROR] at com.sun.tools.javadoc.Start.begin(Start.java:219)
[ERROR] at com.sun.tools.javadoc.Start.begin(Start.java:205)
[ERROR] at com.sun.tools.javadoc.Main.execute(Main.java:64)
[ERROR] at com.sun.tools.javadoc.Main.main(Main.java:54)
[ERROR] 
[ERROR] Command line was: /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/bin/javadoc @options @packages
[ERROR] 
[ERROR] Refer to the generated Javadoc files in '/Users/passos/Development/Projects/AeroGear/aerogear-unifiedpush-server/jaxrs/target/site/apidocs' dir.
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[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
[ERROR] 
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR]   mvn <goals> -rf :unifiedpush-jaxrs