If a JAR without any MANIFEST.MF is placed in the bundles directory (or is scanned as part of WEB-INF/lib in a WAR-packed Nuxeo), a crash occurs:
[StandardContext.listenerStart] Exception sending context initialized event to listener instance of class org.nuxeo.runtime.deployment.NuxeoStarter java.lang.NullPointerException at org.nuxeo.osgi.application.loader.FrameworkLoader.isBundle(FrameworkLoader.java:197) at org.nuxeo.osgi.application.loader.FrameworkLoader.doStart(FrameworkLoader.java:208) at org.nuxeo.osgi.application.loader.FrameworkLoader.start(FrameworkLoader.java:112) at org.nuxeo.runtime.deployment.NuxeoStarter.start(NuxeoStarter.java:111) at org.nuxeo.runtime.deployment.NuxeoStarter.contextInitialized(NuxeoStarter.java:79) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4206) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4705)