Symptoms

When trying to view issues by component on the Project Page the Issues page appears blank on the Screen. Clicking on Roadmap, gives you an error on the screen.

Caused by: java.lang.NullPointerException
	at com.atlassian.jira.bc.project.component.CachingProjectComponentStore.findByComponentNameCaseInSensitive(CachingProjectComponentStore.java:160)
	at com.atlassian.jira.bc.project.component.DefaultProjectComponentManager.findByComponentNameCaseInSensitive(DefaultProjectComponentManager.java:234)
	at com.atlassian.jira.jql.resolver.ComponentResolver.getIdsFromName(ComponentResolver.java:30)

Cause

There is a component without a name.

Resolution

Browse to Administer >> Project >> Components and delete the null component.

Alternatively, if it is not possible to locate the null component via the UI, review the table 'component' in JIRA's database for any rows with a missing/null value in the cname field.

Note that, removing the component through the database, requires a restart of JIRA and/or possibly clearing out the contents of <jira-install>/work directory.