Centos 6.7 and Fedora 23 NiFi build fails to start

In a thread started on Dec 6 by Andre with contributions of many folks it has been discovered that when building NiFi in at least Centos 6.7 and Fedora 23 that there can be problems with pre-compiled JSPs. Stack trace seen on startup looks like this:
Build completes, however ./bin/nifi.sh start causes the error previously
mentioned.

2015-12-07 10:01:26,557 WARN [main] org.apache.nifi.web.server.JettyServer
Failed to start web server... shutting down.
java.lang.IllegalArgumentException: Comparison method violates its general
contract!
at java.util.ComparableTimSort.mergeHi(ComparableTimSort.java:866)
~[na:1.8.0_65]
at java.util.ComparableTimSort.mergeAt(ComparableTimSort.java:483)
~[na:1.8.0_65]
at
java.util.ComparableTimSort.mergeForceCollapse(ComparableTimSort.java:422)
~[na:1.8.0_65]
at java.util.ComparableTimSort.sort(ComparableTimSort.java:222)
~[na:1.8.0_65]
at java.util.Arrays.sort(Arrays.java:1246) ~[na:1.8.0_65]
at
org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:865)
~[jetty-servlet-9.2.11.v20150529.jar:9.2.11.v20150529]
at
org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:298)
~[jetty-servlet-9.2.11.v20150529.jar:9.2.11.v20150529]
at
org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1349)
~[jetty-webapp-9.2.11.v20150529.jar:9.2.11.v20150529]
at
org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1342)
~[jetty-webapp-9.2.11.v20150529.jar:9.2.11.v20150529]
at
org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:741)
~[jetty-server-9.2.11.v20150529.jar:9.2.11.v20150529]
at
org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:505)
~[jetty-webapp-9.2.11.v20150529.jar:9.2.11.v20150529]
at
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
~[jetty-util-9.2.11.v20150529.jar:9.2.11.v20150529]
at
org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)
~[jetty-util-9.2.11.v20150529.jar:9.2.11.v20150529]
at
org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)
~[jetty-util-9.2.11.v20150529.jar:9.2.11.v20150529]
at
org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)
~[jetty-server-9.2.11.v20150529.jar:9.2.11.v20150529]
at
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
~[jetty-util-9.2.11.v20150529.jar:9.2.11.v20150529]
at
org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)
~[jetty-util-9.2.11.v20150529.jar:9.2.11.v20150529]
at org.eclipse.jetty.server.Server.start(Server.java:387)
~[jetty-server-9.2.11.v20150529.jar:9.2.11.v20150529]
at
org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)
~[jetty-util-9.2.11.v20150529.jar:9.2.11.v20150529]
at
org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)
~[jetty-server-9.2.11.v20150529.jar:9.2.11.v20150529]
at org.eclipse.jetty.server.Server.doStart(Server.java:354)
~[jetty-server-9.2.11.v20150529.jar:9.2.11.v20150529]
at
org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
~[jetty-util-9.2.11.v20150529.jar:9.2.11.v20150529]
at
org.apache.nifi.web.server.JettyServer.start(JettyServer.java:663)
~[nifi-jetty-0.4.0-SNAPSHOT.jar:0.4.0-SNAPSHOT]
at org.apache.nifi.NiFi.<init>(NiFi.java:137)
[nifi-runtime-0.4.0-SNAPSHOT.jar:0.4.0-SNAPSHOT]
at org.apache.nifi.NiFi.main(NiFi.java:227)
[nifi-runtime-0.4.0-SNAPSHOT.jar:0.4.0-SNAPSHOT]

Given the comments, I've switched to Java 8 to build:

$ mvn -version
Apache Maven 3.3.9 (bb52d8502b132ec0a5a3f4c09453c07478323dc5;
2015-11-11T03:41:47+11:00)
Maven home: /usr/local/apache-maven-3.3.9
Java version: 1.8.0_65, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-0.b17.el6_7.x86_64/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "2.6.32-573.8.1.el6.x86_64", arch: "amd64",
family: "unix"