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The main FAQ is Confluence Main FAQ. For troubleshooting:

Page: Fix Out of Memory Errors by Increasing Available Memory
Page: Confluence UNIX and X11 Dependencies
Page: Troubleshooting Character Encodings
Page: Cannot install Confluence due to 'NullPointerException in DefaultPluginManager' error
Page: Cannot register Confluence due to 'License you entered was not valid' error
Page: Confluence will not start - CommandBridge ClassNotFoundException
Page: Confluence won't start with "Error creating Home directory"
Page: Fix JavaScript browser errors
Page: How to resolve the "Unprocessed Continuation Reference" error
Page: Fix JavaScript browser errors
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: Fix Out of Memory errors by Increasing Available Memory
Page: Confluence Unix and X11 Dependencies
Page: Confluence Unix and X11 Dependencies
Page: Confluence Unix and X11 Dependencies
Page: Fix Out of Memory Errors by Increasing Available Memory
Page: Confluence Unix and X11 Dependencies
Page: Confluence won't start with "Error creating Home directory"
Page: Confluence will not start - CommandBridge ClassNotFoundException
Page: Cannot register Confluence due to 'License you entered was not valid' error
Page: Cannot install Confluence due to 'NullPointerException in DefaultPluginManager' error
Page: Fix JavaScript browser errors
Page: Confluence Unix and X11 Dependencies
Page: What browsers are supported? I cannot see the Rich Text Editor in my browser
Page: Troubleshooting HTTPS or SSL-related problems
Page: Troubleshooting HTTPS or SSL-related problems
Page: What browsers are supported? I cannot see the Rich Text Editor in my browser
Page: Confluence content or attachments are randomly lost
Page: What browsers are supported? I cannot see the Rich Text Editor in my browser
Page: Troubleshooting HTTPS or SSL-related problems
Page: Fix Out of Memory errors by Increasing Available Memory
Page: Confluence won't start with "Error creating Home directory"
Page: Confluence will not start - CommandBridge ClassNotFoundException
Page: Cannot register Confluence due to 'License you entered was not valid' error
Page: Cannot install Confluence due to 'NullPointerException in DefaultPluginManager' error
Page: Fix JavaScript browser errors
Page: Edit page fails with 'DataIntegrityViolationException... Violation of PRIMARY KEY constraint'
Page: Confluence won't start with "Error creating Home directory"
Page: Confluence will not start - CommandBridge ClassNotFoundException
Page: Cannot register Confluence due to 'License you entered was not valid' error
Page: Cannot install Confluence due to 'NullPointerException in DefaultPluginManager' error
Page: Fix JavaScript browser errors
Page: Edit page fails with 'DataIntegrityViolationException... Violation of PRIMARY KEY constraint'
Page: Confluence content or attachments are randomly lost
Page: Fix 'java.lang.UnsupportedClassVersionError... Unsupported major.minor version 49.0'
Page: Dynamic tasklist macro edits fail with ConversionException after JDK upgrade
Page: Fix 'Error using thumbnails - No image support in Java runtime'
Page: View page containing Chart macro throws 'NoClassDefFoundError'
Page: Cannot send email due to 'javax.mail.NoSuchProviderException' SMTP error
Page: Confluence stops responding after some time
Page: Custom HTML broken in Look and Feel after saving invalid HTML
Page: Edit page fails with 'DataIntegrityViolationException... Violation of PRIMARY KEY constraint'
Page: Fix '404' errors in Space tree view
Page: Fix Case Mismatches in Permissions
Page: Fix 'Page Not Found' errors for pages with spaces in the title
Page: PDF export fails on Linux with UnsatisfiedLinkError
Page: Search is not finding my data AND the indexing process does not appear to be completing
Page: Troubleshooting HTTPS or SSL-related problems
Page: Confluence content or attachments are randomly lost
Page: Search is not finding my data AND the indexing process does not appear to be completing
Page: PDF export fails on Linux with UnsatisfiedLinkError
Page: Cannot send email due to 'javax.mail.NoSuchProviderException' SMTP error
Page: View page containing Chart macro throws 'NoClassDefFoundError'
Page: View page containing Chart macro throws 'NoClassDefFoundError'
Page: Fix '404' errors in Space tree view
Page: Fix 'Page Not Found' errors for pages with spaces in the title
Page: Fix 'Error using thumbnails - No image support in Java runtime'
Page: Confluence stops responding after some time
Page: Fix 'java.lang.UnsupportedClassVersionError... Unsupported major.minor version 49.0'
Page: Fix 'Out of Memory' errors by increasing available memory
Page: Custom HTML broken in Look and Feel after saving invalid HTML
Page: Dynamic tasklist macro edits fail with ConversionException after JDK upgrade
Page: Fix 'Too many open files' error on Linux by increasing filehandles
Page: Search is not finding my data AND the indexing process does not appear to be completing
Page: PDF export fails on Linux with UnsatisfiedLinkError
Page: Cannot send email due to 'javax.mail.NoSuchProviderException' SMTP error
Page: View page containing Chart macro throws 'NoClassDefFoundError'
Page: Fix '404' errors in Space tree view
Page: Fix 'Page Not Found' errors for pages with spaces in the title
Page: Fix 'Error using thumbnails - No image support in Java runtime'
Page: Confluence stops responding after some time
Page: Fix 'java.lang.UnsupportedClassVersionError... Unsupported major.minor version 49.0'
Page: Fix 'Out of Memory' errors by increasing available memory
Page: Custom HTML broken in Look and Feel after saving invalid HTML
Page: Dynamic tasklist macro edits fail with ConversionException after JDK upgrade
Page: Troubleshooting Character Encodings
Page: Troubleshooting Character Encodings
Page: Troubleshooting Character Encodings
Page: Troubleshooting Character Encodings
Page: Troubleshooting Character Encodings
Page: Troubleshooting Character Encodings
Page: Troubleshooting Character Encodings
Page: Troubleshooting Character Encodings
Page: Fix Out of Memory errors by Increasing Available Memory
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'
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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'