java.lang.IllegalStateException: getWriter() has already been called for this response

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    java.lang.IllegalStateException: getWriter() has already been called for this response
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    Root Cause Analysis

    1. java.lang.IllegalStateException

      getWriter() has already been called for this response

      at org.apache.catalina.connector.Response.getOutputStream()
    2. Glassfish Core
      ResponseFacade.getOutputStream
      1. org.apache.catalina.connector.Response.getOutputStream(Response.java:604)
      2. org.apache.catalina.connector.ResponseFacade.getOutputStream(ResponseFacade.java:197)
      2 frames