(two patches on top of master); master itself also fails in the same way, so my patches are not responsible.
$ /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.101-1.b14.fc24.x86_64/jre/bin/java -jar /home/avi/.m2/repository/p2/osgi/bundle/org.eclipse.equinox.launcher/1.3.100.v20150511-1540/org.eclipse.equinox.launcher-1.3.100.v20150511-1540.jar -debug -install /home/avi/eclipse-cdt/doc/org.eclipse.cdt.doc.user/target/eclipserun-work -configuration /home/avi/eclipse-cdt/doc/org.eclipse.cdt.doc.user/target/eclipserun-work/configuration -application org.eclipse.ant.core.antRunner -buildfile, customBuildCallbacks.xml build.index
Configuration location:
file:/home/avi/eclipse-cdt/doc/org.eclipse.cdt.doc.user/target/eclipserun-work/configuration/
Configuration file:
file:/home/avi/eclipse-cdt/doc/org.eclipse.cdt.doc.user/target/eclipserun-work/configuration/config.ini loaded
Install location:
file:/home/avi/eclipse-cdt/doc/org.eclipse.cdt.doc.user/target/eclipserun-work/
Framework located:
file:/home/avi/.m2/repository/p2/osgi/bundle/org.eclipse.osgi/3.10.102.v20160118-1700/org.eclipse.osgi-3.10.102.v20160118-1700.jar
Framework classpath:
file:/home/avi/.m2/repository/p2/osgi/bundle/org.eclipse.osgi/3.10.102.v20160118-1700/org.eclipse.osgi-3.10.102.v20160118-1700.jar
Debug options:
file:/home/avi/eclipse-cdt/.options not found
Time to load bundles: 11
Starting application: 571
An error has occurred. See the log file
/home/avi/eclipse-cdt/doc/org.eclipse.cdt.doc.user/target/eclipserun-work/configuration/1472285043336.log.
!SESSION 2016-08-27 11:04:03.211 -----------------------------------------------
eclipse.buildId=unknown
java.version=1.8.0_101
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
Framework arguments: -application org.eclipse.ant.core.antRunner -buildfile, customBuildCallbacks.xml build.index
Command-line arguments: -debug -application org.eclipse.ant.core.antRunner -buildfile, customBuildCallbacks.xml build.index
!ENTRY org.eclipse.osgi 4 0 2016-08-27 11:04:03.798
!MESSAGE Application error
!STACK 1
java.lang.NullPointerException: null values not allowed
at org.eclipse.core.internal.registry.ReferenceMap.put(ReferenceMap.java:351)
at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.getBundle(RegistryStrategyOSGI.java:151)
at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:166)
at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:905)
at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:55)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:191)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:669)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608)
at org.eclipse.equinox.launcher.Main.run(Main.java:1515)
at org.eclipse.equinox.launcher.Main.main(Main.java:1488)