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

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

Jacek Szymański created CAMEL-19257:
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             Summary: 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: 4.0-M2, 3.20.3
            Reporter: Jacek Szymański


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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