config-pusher error in messaging4transport; possibly because Messaging4TransportModule.getInstance() returned null

original bug filed was 4535, but it was requested to split that in to two separate bugs. here is the relevant trace when installing "odl-integration-compatible-with-all"

2015-10-27 14:16:36,071 | ERROR | config-pusher | ConfigTransactionControllerImpl | 116 - org.opendaylight.controller.config-manager - 0.4.0.SNAPSHOT | Commit failed on ModuleIdentifier

{factoryName='messaging4transport', instanceName='messaging4transport-default'} in transaction TransactionIdentifier{name='ConfigTransaction-234-236'}
java.lang.IllegalStateException: Error in createInstance - null is not allowed as return value. Module: ModuleIdentifier{factoryName='messaging4transport', instanceName='messaging4transport-default'}

at org.opendaylight.controller.config.spi.AbstractModule.getInstance(AbstractModule.java:83)
at sun.reflect.GeneratedMethodAccessor16.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[:1.8.0_60]
at java.lang.reflect.Method.invoke(Method.java:497)[:1.8.0_60]
at org.opendaylight.controller.config.manager.impl.dependencyresolver.DependencyResolverManager$ModuleInvocationHandler.handleInvocation(DependencyResolverManager.java:150)
at com.google.common.reflect.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:87)
at com.sun.proxy.$Proxy41.getInstance(Unknown Source)
at org.opendaylight.controller.config.manager.impl.ConfigTransactionControllerImpl.secondPhaseCommit(ConfigTransactionControllerImpl.java:421)
at org.opendaylight.controller.config.manager.impl.ConfigRegistryImpl.secondPhaseCommit(ConfigRegistryImpl.java:280)
at org.opendaylight.controller.config.manager.impl.ConfigRegistryImpl.commitConfig(ConfigRegistryImpl.java:227)
at sun.reflect.GeneratedMethodAccessor52.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[:1.8.0_60]
at java.lang.reflect.Method.invoke(Method.java:497)[:1.8.0_60]
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)[:1.8.0_60]
at sun.reflect.GeneratedMethodAccessor33.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[:1.8.0_60]
at java.lang.reflect.Method.invoke(Method.java:497)[:1.8.0_60]
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)[:1.8.0_60]
at com.sun.jmx.mbeanserver.ConvertingMethod.invokeWithOpenReturn(ConvertingMethod.java:193)[:1.8.0_60]
at com.sun.jmx.mbeanserver.ConvertingMethod.invokeWithOpenReturn(ConvertingMethod.java:175)[:1.8.0_60]
at com.sun.jmx.mbeanserver.MXBeanIntrospector.invokeM2(MXBeanIntrospector.java:117)[:1.8.0_60]
at com.sun.jmx.mbeanserver.MXBeanIntrospector.invokeM2(MXBeanIntrospector.java:54)[:1.8.0_60]
at com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java:237)[:1.8.0_60]
at com.sun.jmx.mbeanserver.PerInterface.invoke(PerInterface.java:138)[:1.8.0_60]
at com.sun.jmx.mbeanserver.MBeanSupport.invoke(MBeanSupport.java:252)[:1.8.0_60]
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)[:1.8.0_60]
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)[:1.8.0_60]
at com.sun.jmx.mbeanserver.MXBeanProxy$InvokeHandler.invoke(MXBeanProxy.java:150)[:1.8.0_60]
at com.sun.jmx.mbeanserver.MXBeanProxy.invoke(MXBeanProxy.java:167)[:1.8.0_60]
at javax.management.MBeanServerInvocationHandler.invoke(MBeanServerInvocationHandler.java:258)[:1.8.0_60]
at com.sun.proxy.$Proxy23.commitConfig(Unknown Source)[108:org.opendaylight.controller.config-api:0.4.0.SNAPSHOT]
at org.opendaylight.controller.config.util.ConfigRegistryJMXClient.commitConfig(ConfigRegistryJMXClient.java:110)[112:org.opendaylight.controller.config-util:0.4.0.SNAPSHOT]
at org.opendaylight.controller.config.facade.xml.transactions.TransactionProvider.commitTransaction(TransactionProvider.java:145)[118:org.opendaylight.controller.config-manager-facade-xml:0.4.0.SNAPSHOT]
at org.opendaylight.controller.config.facade.xml.ConfigSubsystemFacade.commitSilentTransaction(ConfigSubsystemFacade.java:138)[118:org.opendaylight.controller.config-manager-facade-xml:0.4.0.SNAPSHOT]
at org.opendaylight.controller.config.persist.impl.ConfigPusherImpl.pushConfig(ConfigPusherImpl.java:292)[120:org.opendaylight.controller.config-persister-impl:0.4.0.SNAPSHOT]
at org.opendaylight.controller.config.persist.impl.ConfigPusherImpl.pushConfigWithConflictingVersionRetries(ConfigPusherImpl.java:144)[120:org.opendaylight.controller.config-persister-impl:0.4.0.SNAPSHOT]
at org.opendaylight.controller.config.persist.impl.ConfigPusherImpl.internalPushConfigs(ConfigPusherImpl.java:114)[120:org.opendaylight.controller.config-persister-impl:0.4.0.SNAPSHOT]
at org.opendaylight.controller.config.persist.impl.ConfigPusherImpl.processSingle(ConfigPusherImpl.java:81)[120:org.opendaylight.controller.config-persister-impl:0.4.0.SNAPSHOT]
at org.opendaylight.controller.config.persist.impl.ConfigPusherImpl.process(ConfigPusherImpl.java:74)[120:org.opendaylight.controller.config-persister-impl:0.4.0.SNAPSHOT]
at org.opendaylight.controller.config.persist.impl.osgi.ConfigPersisterActivator$2.run(ConfigPersisterActivator.java:131)[120:org.opendaylight.controller.config-persister-impl:0.4.0.SNAPSHOT]
at java.lang.Thread.run(Thread.java:745)[:1.8.0_60]
2015-10-27 14:16:36,075 | ERROR | config-pusher | ConfigRegistryImpl | 116 - org.opendaylight.controller.config-manager - 0.4.0.SNAPSHOT | Configuration Transaction failed on 2PC, server is unhealthy
java.lang.IllegalStateException: Error - getInstance() failed for ModuleIdentifier

{factoryName='messaging4transport', instanceName='messaging4transport-default'} in transaction TransactionIdentifier{name='ConfigTransaction-234-236'}
at org.opendaylight.controller.config.manager.impl.ConfigTransactionControllerImpl.secondPhaseCommit(ConfigTransactionControllerImpl.java:427)
at org.opendaylight.controller.config.manager.impl.ConfigRegistryImpl.secondPhaseCommit(ConfigRegistryImpl.java:280)
at org.opendaylight.controller.config.manager.impl.ConfigRegistryImpl.commitConfig(ConfigRegistryImpl.java:227)
at sun.reflect.GeneratedMethodAccessor52.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[:1.8.0_60]
at java.lang.reflect.Method.invoke(Method.java:497)[:1.8.0_60]
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)[:1.8.0_60]
at sun.reflect.GeneratedMethodAccessor33.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[:1.8.0_60]
at java.lang.reflect.Method.invoke(Method.java:497)[:1.8.0_60]
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)[:1.8.0_60]
at com.sun.jmx.mbeanserver.ConvertingMethod.invokeWithOpenReturn(ConvertingMethod.java:193)[:1.8.0_60]
at com.sun.jmx.mbeanserver.ConvertingMethod.invokeWithOpenReturn(ConvertingMethod.java:175)[:1.8.0_60]
at com.sun.jmx.mbeanserver.MXBeanIntrospector.invokeM2(MXBeanIntrospector.java:117)[:1.8.0_60]
at com.sun.jmx.mbeanserver.MXBeanIntrospector.invokeM2(MXBeanIntrospector.java:54)[:1.8.0_60]
at com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java:237)[:1.8.0_60]
at com.sun.jmx.mbeanserver.PerInterface.invoke(PerInterface.java:138)[:1.8.0_60]
at com.sun.jmx.mbeanserver.MBeanSupport.invoke(MBeanSupport.java:252)[:1.8.0_60]
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)[:1.8.0_60]
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)[:1.8.0_60]
at com.sun.jmx.mbeanserver.MXBeanProxy$InvokeHandler.invoke(MXBeanProxy.java:150)[:1.8.0_60]
at com.sun.jmx.mbeanserver.MXBeanProxy.invoke(MXBeanProxy.java:167)[:1.8.0_60]
at javax.management.MBeanServerInvocationHandler.invoke(MBeanServerInvocationHandler.java:258)[:1.8.0_60]
at com.sun.proxy.$Proxy23.commitConfig(Unknown Source)[108:org.opendaylight.controller.config-api:0.4.0.SNAPSHOT]
at org.opendaylight.controller.config.util.ConfigRegistryJMXClient.commitConfig(ConfigRegistryJMXClient.java:110)[112:org.opendaylight.controller.config-util:0.4.0.SNAPSHOT]
at org.opendaylight.controller.config.facade.xml.transactions.TransactionProvider.commitTransaction(TransactionProvider.java:145)[118:org.opendaylight.controller.config-manager-facade-xml:0.4.0.SNAPSHOT]
at org.opendaylight.controller.config.facade.xml.ConfigSubsystemFacade.commitSilentTransaction(ConfigSubsystemFacade.java:138)[118:org.opendaylight.controller.config-manager-facade-xml:0.4.0.SNAPSHOT]
at org.opendaylight.controller.config.persist.impl.ConfigPusherImpl.pushConfig(ConfigPusherImpl.java:292)[120:org.opendaylight.controller.config-persister-impl:0.4.0.SNAPSHOT]
at org.opendaylight.controller.config.persist.impl.ConfigPusherImpl.pushConfigWithConflictingVersionRetries(ConfigPusherImpl.java:144)[120:org.opendaylight.controller.config-persister-impl:0.4.0.SNAPSHOT]
at org.opendaylight.controller.config.persist.impl.ConfigPusherImpl.internalPushConfigs(ConfigPusherImpl.java:114)[120:org.opendaylight.controller.config-persister-impl:0.4.0.SNAPSHOT]
at org.opendaylight.controller.config.persist.impl.ConfigPusherImpl.processSingle(ConfigPusherImpl.java:81)[120:org.opendaylight.controller.config-persister-impl:0.4.0.SNAPSHOT]
at org.opendaylight.controller.config.persist.impl.ConfigPusherImpl.process(ConfigPusherImpl.java:74)[120:org.opendaylight.controller.config-persister-impl:0.4.0.SNAPSHOT]
at org.opendaylight.controller.config.persist.impl.osgi.ConfigPersisterActivator$2.run(ConfigPersisterActivator.java:131)[120:org.opendaylight.controller.config-persister-impl:0.4.0.SNAPSHOT]
at java.lang.Thread.run(Thread.java:745)[:1.8.0_60]
Caused by: java.lang.IllegalStateException: Error in createInstance - null is not allowed as return value. Module: ModuleIdentifier{factoryName='messaging4transport', instanceName='messaging4transport-default'}

at org.opendaylight.controller.config.spi.AbstractModule.getInstance(AbstractModule.java:83)
at sun.reflect.GeneratedMethodAccessor16.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[:1.8.0_60]
at java.lang.reflect.Method.invoke(Method.java:497)[:1.8.0_60]
at org.opendaylight.controller.config.manager.impl.dependencyresolver.DependencyResolverManager$ModuleInvocationHandler.handleInvocation(DependencyResolverManager.java:150)
at com.google.common.reflect.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:87)
at com.sun.proxy.$Proxy41.getInstance(Unknown Source)
at org.opendaylight.controller.config.manager.impl.ConfigTransactionControllerImpl.secondPhaseCommit(ConfigTransactionControllerImpl.java:421)
... 33 more