Unable to Access Attachment Page with java.lang.ClassCastException Error
Symptoms
Unable to access the attachment in the page. Instead of getting the attachment page, java.lang.ClassCastException Error is encountered.
The following appears in the atlassian-confluence.log:
2014-01-02 14:26:05,944 ERROR [http-8090-25] [atlassian.confluence.servlet.ConfluenceServletDispatcher] sendError Could not execute action
-- url: /pages/viewpageattachments.action | userName: sternm40 | referer: http://localhost:8090/pages/viewpage.action?pageId=3407911
java.lang.IllegalArgumentException: java.lang.ClassCastException@6461c58e
at sun.reflect.GeneratedMethodAccessor6114.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at com.opensymphony.xwork.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:302)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:170)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
at com.atlassian.confluence.validation.MessageHolderInterceptor.intercept(MessageHolderInterceptor.java:42)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:165)
...Cause 1
OpenJDK 64-bit is used which is not compatible with Confluence.
Cause 2
A plugin can cause this issue.
Resolution for Cause 1
Use a supported JDK. Refer to Confluence supported platform documentation to find out more about supported JDKs for latest version of Confluence. (visit this link for earlier versions of Confluence)
Resolution for Cause 2
Use safe mode to verify that a third party plugin is the culprit as described in the following article: Disabling and enabling apps
Last modified on Nov 2, 2018
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