reported first at https://community.jboss.org/message/725744

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:s="urn:java:ee"
xmlns:t="urn:java:org.jboss.seam.transaction"
xmlns:ft="urn:java:org.jboss.seam.faces.transaction"
xmlns:sc="urn:java:org.jboss.solder.core"
xsi:schemaLocation="
http://java.sun.com/xml/ns/javaee
http://docs.jboss.org/cdi/beans_1_0.xsd">

<t:SeSynchronizations>
<s:modifies />
</t:SeSynchronizations>

<t:EntityTransaction>
<s:modifies />
</t:EntityTransaction>

<sc:Veto>
<s:Qualifier />
</sc:Veto>

<ft:TransactionPhaseListener>
<s:replaces />
<sc:Veto />
</ft:TransactionPhaseListener>
</beans>

gives:

Errors occurred during the build.
Errors running builder 'CDI (Context and Dependency Injection) Builder' on project 'VeereJSF'.
java.lang.NullPointerException

!MESSAGE Errors running builder 'CDI (Context and Dependency Injection) Builder' on project 'VeereJSF'.
!STACK 0
java.lang.NullPointerException
at org.jboss.tools.cdi.seam.config.core.ConfigDefinitionContext.addAnnotation(ConfigDefinitionContext.java:149)
at org.jboss.tools.cdi.seam.config.core.scanner.SeamDefinitionBuilder.scanAnnotation(SeamDefinitionBuilder.java:140)
at org.jboss.tools.cdi.seam.config.core.scanner.SeamDefinitionBuilder.scanElement(SeamDefinitionBuilder.java:101)
at org.jboss.tools.cdi.seam.config.core.scanner.SeamDefinitionBuilder.scanRoot(SeamDefinitionBuilder.java:85)
at org.jboss.tools.cdi.seam.config.core.scanner.SeamDefinitionBuilder.createDefinition(SeamDefinitionBuilder.java:75)
at org.jboss.tools.cdi.seam.config.core.CDISeamConfigExtension.buildDefinitions(CDISeamConfigExtension.java:147)
at org.jboss.tools.cdi.core.CDICoreBuilder.build(CDICoreBuilder.java:227)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:728)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:199)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:239)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:292)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:295)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:351)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:374)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:143)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:241)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)