The main FAQ is Confluence Main FAQ. For troubleshooting:
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Page: Cannot install Confluence due to 'NullPointerException in DefaultPluginManager' error
Page: Cannot install Confluence due to missing demo-site.zip
Page: Cannot register Confluence due to 'License you entered was not valid' error
Page: Cannot send email due to 'javax.mail.NoSuchProviderException' SMTP error
Page: Confluence content or attachments are randomly lost
Page: Confluence stops responding after some time
Page: Confluence will not start - CommandBridge ClassNotFoundException
Page: Confluence won't start with "Error creating Home directory"
Page: Custom HTML broken in Look and Feel after saving invalid HTML
Page: Dynamic tasklist macro edits fail with ConversionException after JDK upgrade
Page: Edit page fails with 'DataIntegrityViolationException... Violation of PRIMARY KEY constraint'
Page: Fix '404' errors in Space tree view
Page: Fix 'Error using thumbnails - No image support in Java runtime'
Page: Fix 'java.lang.UnsupportedClassVersionError... Unsupported major.minor version 49.0'
Page: Fix 'Out of Memory' errors by increasing available memory
Page: Fix 'Page Not Found' errors for pages with spaces in the title
Page: Fix 'Too many open files' error on Linux by increasing filehandles
Page: Fix JavaScript browser errors
Page: PDF export fails on Linux with UnsatisfiedLinkError
Page: Resolve Missing Attachments in Confluence
Page: RSS Feed FAQ
Page: Search is not finding my data AND the indexing process does not appear to be completing
Page: View page containing Chart macro throws 'NoClassDefFoundError'






