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Posted to dev@sling.apache.org by "Eric Norman (Jira)" <ji...@apache.org> on 2021/06/09 21:22:00 UTC
[jira] [Created] (SLING-10478) SlingServletResolver#handleError
should not attempt to flush/close an already closed response writer
Eric Norman created SLING-10478:
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Summary: SlingServletResolver#handleError should not attempt to flush/close an already closed response writer
Key: SLING-10478
URL: https://issues.apache.org/jira/browse/SLING-10478
Project: Sling
Issue Type: Bug
Reporter: Eric Norman
Assignee: Eric Norman
Fix For: Servlets Resolver 2.7.16
In SlingServletResolver#handleError if the errorHandler servlet has already closed the response writer, then it should not attempt to flush/close it again.
The attempt to flush/close the already closed writer after the errorHandler servlet is invoked can result in a WriterAlreadyClosedException being thrown which can fill up the logs with noise.
For example, if a custom error handler servlet is generating a JSON error response using a JsonGenerator that writes to the response writer, then closing the JsonGenerator object would also close the response writer.
The logs have exceptions like this:
{noformat}
java.io.IOException: Error handler failed: org.apache.sling.engine.impl.SlingHttpServletResponseImpl$WriterAlreadyClosedExceptionjava.io.IOException: Error handler failed: org.apache.sling.engine.impl.SlingHttpServletResponseImpl$WriterAlreadyClosedException at org.apache.sling.servlets.resolver.internal.SlingServletResolver.handleError(SlingServletResolver.java:655) [org.apache.sling.servlets.resolver:2.7.14] at org.apache.sling.servlets.resolver.internal.SlingServletResolver.handleError(SlingServletResolver.java:328) [org.apache.sling.servlets.resolver:2.7.14] at org.apache.sling.engine.impl.DefaultErrorHandler.handleError(DefaultErrorHandler.java:97) [org.apache.sling.engine:2.7.6]...{noformat}
Expected:
Track whether the response writer is closed and skip the flush/close calls if it is already closed.
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