Re: [OT????] java.lang.IllegalStateException: NoWriterSupplied: No writer supplied for serializer.

Sat, 15 Nov 2008 11:58:11 -0800 

That's the trick, thanks, Uwe!
Although, I wonder about not passing start/endDocument. Seems like even when you are restricting to an XPath, you still have the start and end of a document. 


On Nov 15, 2008, at 2:34 PM, Uwe Schindler wrote:


Hi Grant,

Here my first answer to a question for this project :-].


From the call stack and your code in the second test step (when you  
use the

XPath with MatchingContentHandler around the serializer), I think the
following is the problem:

The MatchingContentHandler states in the documentation, that it does  
not
pass startDocument/endDocument events to the delegate (maybe because  
these
events do not match the XPath). The Serializer does not like this  
(because
it initializes the output writer in startDocument()). You can fix  
this by

manually adding serializer.startDocument/endDocument before/after
serializing.

-----
Uwe Schindler
H.-H.-Meier-Allee 63, D-28213 Bremen
http://www.thetaphi.de
eMail: [EMAIL PROTECTED]


-----Original Message-----
From: Grant Ingersoll [mailto:[EMAIL PROTECTED]
Sent: Saturday, November 15, 2008 7:58 PM
To: tika-dev@incubator.apache.org

Subject: [OT????] java.lang.IllegalStateException:  
NoWriterSupplied: No

writer supplied for serializer.


This may just show my lack of understanding of XPath, etc., but  
when I

apply [1] to TestParsers, I get the following output:
----------------------------
Val: <?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml";>
    <head>
        <title/>
    </head>
    <body>
        <p>


    Solr Version Control System





      Overview

        The Solr source code resides in the Apache Subversion (SVN)
repository.
        The command-line SVN client can be obtained here or as an
optional package for cygwin.
        The TortoiseSVN GUI client for Windows can be obtained here.
There
        are also SVN plugins available for older versions of Eclipse
and
        IntelliJ IDEA that don't have subversion support already
included.


    Here is some more text.  It contains a link.
    Text Here


</p>
    </body>
</html>


java.lang.IllegalStateException: NoWriterSupplied: No writer supplied
for serializer.
        at org.apache.xml.serialize.XMLSerializer.startElement(Unknown
Source)
        at
org
.apache
.tika

.sax 
.ContentHandlerDecorator.startElement(ContentHandlerDecorator.java:

75)
        at
org
.apache
.tika
.sax

.xpath 
.MatchingContentHandler.startElement(MatchingContentHandler.java:

62)
        at
org
.apache
.tika

.sax 
.ContentHandlerDecorator.startElement(ContentHandlerDecorator.java:

75)
        at
org
.apache

.tika.sax.XHTMLContentHandler.startElement(XHTMLContentHandler.java: 
111)

        at
org
.apache

.tika.sax.XHTMLContentHandler.startElement(XHTMLContentHandler.java: 
115)

        at
org
.apache
.tika

.sax.XHTMLContentHandler.lazyStartDocument(XHTMLContentHandler.java: 
77)

        at
org
.apache

.tika.sax.XHTMLContentHandler.startElement(XHTMLContentHandler.java: 
110)

        at
org
.apache

.tika.sax.XHTMLContentHandler.startElement(XHTMLContentHandler.java: 
115)

        at org.apache.tika.parser.xml.XMLParser.parse(XMLParser.java:51)
        at org.apache.tika.TestParsers.testXML(TestParsers.java:96)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at
sun

.reflect 
.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:

39)
        at
sun
.reflect

.DelegatingMethodAccessorImpl 
.invoke(DelegatingMethodAccessorImpl.java:

25)
        at

com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java: 
40)

-----------------------


Anyone have any insight as to why wrapping a XMLSerializer inside  
of a

MatchingContentHandler is causing such a problem?

Thanks,
Grant



[1]
Index: src/test/java/org/apache/tika/TestParsers.java
===================================================================
--- src/test/java/org/apache/tika/TestParsers.java      (revision
713397)

+++ src/test/java/org/apache/tika/TestParsers.java      (working  
copy)

@@ -19,16 +19,28 @@
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.InputStream;
+import java.io.StringBufferInputStream;
+import java.io.StringWriter;
+import java.io.ByteArrayInputStream;
 import java.util.List;
+import java.nio.charset.Charset;

 import junit.framework.TestCase;

 import org.apache.tika.config.TikaConfig;
 import org.apache.tika.metadata.Metadata;
 import org.apache.tika.parser.Parser;
+import org.apache.tika.parser.xml.XMLParser;
 import org.apache.tika.utils.ParseUtils;
 import org.apache.tika.utils.Utils;
+import org.apache.tika.sax.xpath.Matcher;
+import org.apache.tika.sax.xpath.MatchingContentHandler;
+import org.apache.tika.sax.xpath.XPathParser;
+import org.apache.tika.sax.XHTMLContentHandler;
+import org.apache.xml.serialize.XMLSerializer;
+import org.apache.xml.serialize.OutputFormat;
 import org.xml.sax.helpers.DefaultHandler;
+import org.xml.sax.ContentHandler;

 /**
  * Junit test class for Tika [EMAIL PROTECTED] Parser}s.
@@ -62,7 +74,59 @@
         tc = TikaConfig.getDefaultConfig();
     }

-    public void testPDFExtraction() throws Exception {
+  private static final XPathParser PARSER =
+          new XPathParser("xhtml", XHTMLContentHandler.XHTML);
+
+  public void testXML() throws Exception {
+    XMLParser parser = new XMLParser();
+    StringWriter writer = new StringWriter();
+    Metadata metadata = new Metadata();
+    ContentHandler contentHandler = new XMLSerializer(writer, new
OutputFormat("XML", "UTF-8", true));
+    parser.parse(new
ByteArrayInputStream(sampleXML.getBytes(Charset.forName("UTF-8"))),
contentHandler, metadata);
+    writer.close();
+    System.out.println("Val: " + writer.toString());
+
+
+
+    metadata = new Metadata();
+    writer = new StringWriter();
+    Matcher matcher = PARSER.parse("/xhtml:html/descendant:node()");
+    contentHandler = new XMLSerializer(writer, new
OutputFormat("XML", "UTF-8", true));
+    MatchingContentHandler parsingHandler = new
MatchingContentHandler(contentHandler, matcher);
+    parser.parse(new
ByteArrayInputStream(sampleXML.getBytes(Charset.forName("UTF-8"))),
parsingHandler, metadata);
+    //parser.parse(new StringBufferInputStream(sampleXML),
parsingHandler, metadata);
+    writer.close();
+    System.out.println("Val: " + writer.toString());
+  }
+
+
+
+  private static String sampleXML = "<document>\n" +
+          "  \n" +
+          "  <header>\n" +
+          "    <title>Solr Version Control System</title>\n" +
+          "  </header>\n" +
+          "  \n" +
+          "  <body>\n" +
+          "  \n" +
+          "    <section>\n" +
+          "      <title>Overview</title>\n" +
+          "      <p>\n" +

+          "        The Solr source code resides in the Apache <a  
href=
\"http://subversion.tigris.org/\";>Subversion (SVN)</a> repository. 
\n" +

+          "        The command-line SVN client can be obtained <a
href=\"http://subversion.tigris.org/project_packages.html\";>here</a>
or as an optional package for <a href=\"http://www.cygwin.com/
\">cygwin</a>.\n" +
+          "        The TortoiseSVN GUI client for Windows can be

obtained <a href=\"http://tortoisesvn.tigris.org/\";>here</a>. There 
\n" +

+          "        are also SVN plugins available for older versions
of <a href=\"http://subclipse.tigris.org/\";>Eclipse</a> and \n" +
+          "        <a href=\"http://svnup.tigris.org/\";>IntelliJ
IDEA</a> that don't have subversion support already included.\n" +
+          "      </p>\n" +
+          "    </section>\n" +
+          "    <p>Here is some more text.  It contains <a
href=\"http://lucene.apache.org
\">a link</a>. </p>\n" +
+          "    <p>Text Here</p>\n" +
+          "  </body>\n" +
+          "  \n" +
+          "</document>";
+
+
+  public void testPDFExtraction() throws Exception {
         File file = getTestFile("testPDF.pdf");
         String s1 = ParseUtils.getStringContent(file, tc);
         String s2 = ParseUtils.getStringContent(file, tc,
"application/pdf");
























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