The current version of the plugin is not compatible with TeamCity 8.1:
[2014-03-07 09:37:15,338] ERROR - gins.spring.SpringPluginLoader - Failed to initialize spring context for plugin piazza
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'piazza' defined in plugin: piazza#team-piazza-server-1.0-SNAPSHOT.jar!/META-INF/build-server-plugin.xml: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.natpryce.piazza.Piazza]: Constructor threw exception; nested exception is java.lang.NullPointerException: email
at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:288)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1003)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:907)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:485)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:580)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425)
at jetbrains.buildServer.plugins.spring.SpringPluginLoader.pluginClassesLoaded(SpringPluginLoader.java:72)
at sun.reflect.GeneratedMethodAccessor60.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at jetbrains.buildServer.util.EventDispatcher.dispatch(EventDispatcher.java:117)
at jetbrains.buildServer.util.EventDispatcher$2.invoke(EventDispatcher.java:67)
at com.sun.proxy.$Proxy7.pluginClassesLoaded(Unknown Source)
at jetbrains.buildServer.plugins.PluginManagerImpl$2.visitPlugin(PluginManagerImpl.java:122)
at jetbrains.buildServer.plugins.PluginsCollection.foreachLoadedPlugins(PluginsCollection.java:107)
at jetbrains.buildServer.plugins.PluginManagerImpl.firePluginClassesLoaded(PluginManagerImpl.java:120)
at jetbrains.buildServer.plugins.PluginManagerImpl.loadPlugins(PluginManagerImpl.java:80)
at jetbrains.buildServer.web.plugins.PluginManagerConfigurator.initializePlugins(PluginManagerConfigurator.java:10)
at jetbrains.buildServer.web.impl.BuildServerConfigurator.loadConfiguration(BuildServerConfigurator.java:86)
at jetbrains.buildServer.maintenance.TeamCityDispatcherServlet$WebApplicationCreatorAndDestroyer.createApplication(TeamCityDispatcherServlet.java:14)
at jetbrains.buildServer.maintenance.StartupProcessor.doApplicationStarting(StartupProcessor.java:147)
at jetbrains.buildServer.maintenance.StartupProcessor.processConcreteStage(StartupProcessor.java:132)
at jetbrains.buildServer.maintenance.StartupProcessor.processConcreteStageSafe(StartupProcessor.java:186)
at jetbrains.buildServer.maintenance.StartupProcessor.processTeamCityLifecycle(StartupProcessor.java:110)
at jetbrains.buildServer.maintenance.StartupProcessor.access$000(StartupProcessor.java:244)
at jetbrains.buildServer.maintenance.StartupProcessor$1.run(StartupProcessor.java)
at java.lang.Thread.run(Thread.java:744)
Caused by: org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.natpryce.piazza.Piazza]: Constructor threw exception; nested exception is java.lang.NullPointerException: email
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:141)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:108)
at jetbrains.buildServer.spring.InstantiationStrategySelector$1.instantiate(InstantiationStrategySelector.java:57)
at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:280)
... 32 more
Caused by: java.lang.NullPointerException: email
at com.timgroup.jgravatar.internal.com.google.common.base.Preconditions.checkNotNull(Preconditions.java:204)
at com.timgroup.jgravatar.Gravatar.getUrl(Gravatar.java:129)
at com.natpryce.piazza.PiazzaUserAdapter.determineGravatarUrl(PiazzaUserAdapter.java:76)
at com.natpryce.piazza.PiazzaUserAdapter.reloadUsers(PiazzaUserAdapter.java:67)
at com.natpryce.piazza.PiazzaUserAdapter.<init>(PiazzaUserAdapter.java:42)
at com.natpryce.piazza.Piazza.<init>(Piazza.java:50)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:126)
... 35 more
The current version of the plugin is not compatible with TeamCity 8.1: