Symptoms

Blog post Macro Fails to render, and the following appears in the atlassian-confluence.log:

Caused by: org.apache.velocity.exception.MethodInvocationException: Invocation of method 'getPostingYear' in  class com.atlassian.confluence.pages.BlogPost$$EnhancerByCGLIB$$118c9662 threw exception java.lang.ClassCastException: com.atlassian.confluence.pages.Page cannot be cast to com.atlassian.confluence.pages.BlogPost at template/includes/macros.vm[line 721, column 72]
	at org.apache.velocity.runtime.parser.node.ASTIdentifier.execute(ASTIdentifier.java:223)
	at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:262)
	at 

Diagnosis

This issue can be reproduced each time a blog post is renamed, as per: CONF-16694 - Getting issue details... STATUS

Cause

Third party plugins, such as the PageTypes plugin by Scandio (de.scandio.confluence.plugins.pagetypes)

Resolution

• Enable Safe Mode via Confluence Admin >> Manage Add-Ons
• Alternatively, you can look for the PageTypes plugin by Scandio and disable that