[jira] [Commented] (CAMEL-19257) camel-jslt: Exception when using camel-jslt in Tomcat Servlet

["Jacek Szymański (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CAMEL-19257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17709615#comment-17709615 ] 

Jacek Szymański commented on CAMEL-19257:
-----------------------------------------

I'll post a PR to fix it.

> camel-jslt: Exception when using camel-jslt in Tomcat Servlet
> -------------------------------------------------------------
>
>                 Key: CAMEL-19257
>                 URL: https://issues.apache.org/jira/browse/CAMEL-19257
>             Project: Camel
>          Issue Type: Bug
>    Affects Versions: 3.20.3, 4.0-M2
>            Reporter: Jacek Szymański
>            Priority: Major
>
> When a JSLT transformation is used in a route which is called from a Tomcat Servlet in Spring Boot, an exception is thrown after the Exchange is completely processed and the response is being returned to the client:
> {{java.lang.IllegalStateException: getWriter() has already been called for this response}}
> {{at org.apache.catalina.connector.Response.getOutputStream(Response.java:552) ~[tomcat-embed-core-9.0.70.jar:9.0.70]}}
> {{at org.apache.catalina.connector.ResponseFacade.getOutputStream(ResponseFacade.java:210) ~[tomcat-embed-core-9.0.70.jar:9.0.70]}}
> {{at org.apache.camel.http.common.DefaultHttpBinding.doWriteDirectResponse(DefaultHttpBinding.java:537) ~[camel-http-common-3.20.3.jar:3.20.3]}}
> {{at org.apache.camel.http.common.DefaultHttpBinding.doWriteResponse(DefaultHttpBinding.java:439) ~[camel-http-common-3.20.3.jar:3.20.3]}}
> {{at org.apache.camel.http.common.DefaultHttpBinding.writeResponse(DefaultHttpBinding.java:362) ~[camel-http-common-3.20.3.jar:3.20.3]}}
> {{at org.apache.camel.http.common.CamelServlet.afterProcess(CamelServlet.java:349) ~[camel-http-common-3.20.3.jar:3.20.3]}}
> This happens because the Response object is held in a header and getWriter() gets prematurely called when the headers are serialized in JsltEndpoint.extractVariables().



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