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username should not be null!
com.atlassian.jira.util.dbc.Assertions$NullArgumentException: name should not be null! at com.atlassian.jira.util.dbc.Assertions.notNull(Assertions.java:24) at com.atlassian.jira.util.dbc.Null.not(Null.java:12) at com.atlassian.jira.plugin.PluginVersionImpl.<init>(PluginVersionImpl.java:31) at com.atlassian.jira.plugin.JiraPluginManager.storePluginVersion(JiraPluginManager.java:155) at com.atlassian.jira.plugin.JiraPluginManager.storePluginVersions(JiraPluginManager.java:130) at com.atlassian.jira.plugin.JiraPluginManager.start(JiraPluginManager.java:50) at com.atlassian.jira.ComponentManager$PluginSystem.start(ComponentManager.java:1276) at com.atlassian.jira.ComponentManager.quickStart(ComponentManager.java:200) at com.atlassian.jira.ComponentManager.start(ComponentManager.java:186) at com.atlassian.jira.upgrade.ConsistencyLauncher.launchConsistencyChecker(ConsistencyLauncher.java:59) at com.atlassian.jira.upgrade.ConsistencyLauncher.contextInitialized(ConsistencyLauncher.java:40) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3764) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4216) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014) at org.apache.catalina.core.StandardHost.start(StandardHost.java:736) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443) at org.apache.catalina.core.StandardService.start(StandardService.java:448) at org.apache.catalina.core.StandardServer.start(StandardServer.java:700) at org.apache.catalina.startup.Catalina.start(Catalina.java:552) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)