Hello,
we've experimenting with fop as an PDF renderer and would like to
upgrde to fop0.20. As this is only a part of a larger framework,
we used to use the TraX Result Wrappers to pass along our input to
fop. Somehow I do not understand the latest FOP-API changes:
The call sequence we used succesfully with fop0.17(?), 0.18 and 0.19
was, like
Result res = obtainResult(XMLServletRequestStatus status, OutputStream
out)
//
// ... Do s.th. to "fill" the result
//
Driver driver = status.getDriver();
driver.format();
driver.render();
with the method obtainResult() defined like
protected Result obtainResult(XMLServletRequestStatus status,
OutputStream out)
throws IOException
{
if(!status.isFOStyle())
{
return new StreamResult(out);
}
else
{
Driver driver = new Driver();
String version = org.apache.fop.apps.Version.getVersion();
driver.setRenderer("org.apache.fop.render.pdf.PDFRenderer",version);
driver.addElementMapping("org.apache.fop.fo.StandardElementMapping");
driver.addElementMapping("org.apache.fop.svg.SVGElementMapping");
driver.addPropertyList("org.apache.fop.fo.StandardPropertyListMapping");
driver.addPropertyList("org.apache.fop.svg.SVGPropertyListMapping");
driver.setOutputStream(out);
status.setDriver(driver);
return new SAXResult(driver.getContentHandler());
}
}
as it turned out, some of those API ceased to exist, though marked as
deprecated
in the JavaDoc. So I reworked obtainResult() to this:
protected Result obtainResult(XMLServletRequestStatus status,
OutputStream out)
throws IOException
{
if(!status.isFOStyle())
{
return new StreamResult(out);
}
else
{
Driver driver = new Driver();
String version = org.apache.fop.apps.Version.getVersion();
// as of version 0.20.1
//driver.setRenderer("org.apache.fop.render.pdf.PDFRenderer",version);
org.apache.fop.render.Renderer rend = new
org.apache.fop.render.pdf.PDFRenderer();
log.msg("Renderer = "+rend);
driver.setRenderer(rend);
driver.addElementMapping("org.apache.fop.fo.StandardElementMapping");
driver.addElementMapping("org.apache.fop.svg.SVGElementMapping");
// as of version 0.20.1
//
driver.addPropertyList("org.apache.fop.fo.StandardPropertyListMapping");
//
driver.addPropertyList("org.apache.fop.svg.SVGPropertyListMapping");
driver.setOutputStream(out);
status.setDriver(driver);
return new SAXResult(driver.getContentHandler());
}
}
This compiles, so at least it uses only known API's, but plugin it into
the surrounding environment, I end up with this:
java.lang.NullPointerException
at
org.apache.fop.fo.FOTreeBuilder.startDocument(FOTreeBuilder.java:167)
at
com.icl.saxon.output.ContentHandlerProxy.startDocument(ContentHandlerProxy.j
ava:80)
at
com.icl.saxon.output.ProxyEmitter.startDocument(ProxyEmitter.java:61)
at com.icl.saxon.output.Outputter.open(Outputter.java:58)
at
com.icl.saxon.output.GeneralOutputter.setOutputDestination(GeneralOutputter.
java:70)
at
com.icl.saxon.Controller.changeOutputDestination(Controller.java:403)
at com.icl.saxon.Controller.transformDocument(Controller.java:1036)
at com.icl.saxon.Controller.transform(Controller.java:917)
at
de.coi.xml.xslt.FileTransformerPool$PoolableTransformer.transform(FileTransf
ormerPool.java:562)
at de.coi.servlet.XMLServlet.doGet(XMLServlet.java:302)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:102)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:83)
at com.caucho.server.http.Invocation.service(Invocation.java:325)
at
com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:121)
at
com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:239)
at
com.caucho.server.http.HttpRequest.handleConnection(HttpRequest.java:157)
at com.caucho.server.TcpConnection.run(TcpConnection.java:140)
at java.lang.Thread.run(Thread.java:484)
Which looks like the streamRenderer member in FOTreeBuilder has not been
initialized.
Before I start sifting thru the whole code, any quick clue from a guru?
You might also note that I actually don't think I need SVG, put I didn't get
the
older fops to works without it.
Thank you very much,
Frank
--
Dr. Frank Sven Nestel
Principal Software Engineer
COI GmbH Erlanger Straße 62, D-91074 Herzogenaurach
Phone +49 (0) 9132 82 4611
http://www.coi.de, mailto:[EMAIL PROTECTED]
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