Crystal Reports IllegalStateException

So, my companies web app was throwing this nebulous IllegalStateException exception (see stacktrace below) that did not seem to adversely affect the application but I just couldn't let it go. I was able to resolve it like this:

1. First, I googled it... not much help in the first few pages other than telling me what I already knew. 'out' was being called after it had been commited/closed.
2. Though I usually don't have to do this anymore, it finally dawned on me to look at the compiled JSP code. (This was legacy, pure JSP... no struts nor nothing.) We were using Tomcat 5.5 and Eclipse 3.3+ so my JSP class was in the 'work' directory of my Eclipse project. Sure enough, there were out.print("") in my compiled JSP class. Where were they coming from?
   
3. We had no explicit out.print() in our JSP code, so just looking at where they were in the class and how our JSPs were constructed, it seemed a close correspondence to an out reference for every JSP directive (like @page, etc.)
   
4. So, I googled this: illegalstateexception crystal tomcat
   and came across this link http://www.forumtopics.com/busobj/viewtopic.php?t=126993&sid=2b09528912043e0fbe72e0a947dc300a which basically tells you to avoid line breaks between your JSP directives.
   
5. Problem solved.

|ESD|13:28:22,363|ERROR|Servlet.service() for servlet jsp threw exception [http-12080-Processor22|org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/esd].[jsp]]
java.lang.IllegalStateException: getOutputStream() has already been called for this response
    at org.apache.catalina.connector.Response.getWriter(Response.java:607)
    at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:196)
    at org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:125)
    at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:118)
    at org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.java:179)
    at org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:116)
    at org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:76)
    at org.apache.jsp.pages.reports.CrystalReportViewer_jsp._jspService(CrystalReportViewer_jsp.java:184)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
    at org.displaytag.filter.ResponseOverrideFilter.doFilter(ResponseOverrideFilter.java:125)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
    at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
    at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
    at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
    at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
    at java.lang.Thread.run(Thread.java:595)