I looked at the org.apache.xml.serialize classes for the first
time today and I can't seem to get a simple XMLSerializer
example to work. I keep getting NullPointerExceptions all over
the place.
Has anyone else seen these problems? Is it a usage problem?
Perhaps we should have part of the documentation talk about
how to use the new serializer APIs. Anybody interested in
writing those docs?
Also, I think I saw some bugs in the code. But I'd like to
get an answer on whether I'm using them correctly before I
start fixing bugs in the source.
I've included the program below as well as the stack trace of
the exception.
// BEGIN Test.java
package test;
import org.apache.xerces.parsers.DOMParser;
import org.apache.xml.serialize.Method;
import org.apache.xml.serialize.OutputFormat;
import org.apache.xml.serialize.Serializer;
import org.apache.xml.serialize.SerializerFactory;
import org.apache.xml.serialize.XMLSerializer;
import org.w3c.dom.Document;
public class Test {
public static void main(String argv[]) throws Exception {
DOMParser parser = new DOMParser();
SerializerFactory factory =
SerializerFactory.getSerializerFactory(Method.XML);
for (int i = 0; i < argv.length; i++) {
final String arg = argv[i];
System.err.println("argv["+i+"]: "+arg);
parser.parse(arg);
Document document = parser.getDocument();
OutputFormat format = new OutputFormat(document, "UTF-8", false);
Serializer serializer = factory.makeSerializer(format);
serializer.asDOMSerializer().serialize(document);
}
}
}
// END Test.java
// BEGIN personal.xml
<?xml version="1.0"?>
<!DOCTYPE personnel SYSTEM "personal.dtd">
<?xml-stylesheet type='text/xsl' href='personal.xsl'?>
<personnel>
<person id="H.MARUYAMA" >
<name><family>MARUYAMA</family> <given>Hiroshi</given></name>
<email>[EMAIL PROTECTED]</email>
<link subordinates=" N.URAMOTO K.TAMURA "/>
</person>
<person id="N.URAMOTO">
<name><family>URAMOTO</family> <given>Naohiko</given></name>
<email>[EMAIL PROTECTED]</email>
<link manager=" H.MARUYAMA"/>
</person>
<person id="K.TAMURA">
<name>
<family>TAMURA</family> <given>Kent</given>
</name>
<!-- This URL is mail address.-->
<url href="mailto:[EMAIL PROTECTED]"/>
<url href="mailto:[EMAIL PROTECTED]"/>
<link manager="H.MARUYAMA"/>
</person>
</personnel>
// END personal.xml
// BEGIN personal.dtd
<?xml encoding="US-ASCII"?>
<!ELEMENT personnel (person)+>
<!ATTLIST person note CDATA #IMPLIED
contr (true|false) "false"
id ID #REQUIRED>
<!ELEMENT person (name,email*,url*,link?)>
<!ELEMENT family (#PCDATA)>
<!ELEMENT given (#PCDATA)>
<!ELEMENT name (family,given?)>
<!ELEMENT email (#PCDATA)>
<!ELEMENT url EMPTY>
<!ATTLIST url href CDATA "http://";>
<!ELEMENT link EMPTY>
<!ATTLIST link
manager IDREF #IMPLIED
subordinates IDREFS #IMPLIED>
<!NOTATION gif SYSTEM "photoshop.exe">
<!ENTITY internal-entity "entity-value">
<!ENTITY external-entity PUBLIC "-//ENTITY" "external-entity.ent">
<!ENTITY unparsed-entity SYSTEM "unparsed-entity.ent" NDATA gif>
// END personal.dtd
// BEGIN Stack Trace
Exception in thread "main" java.lang.NullPointerException:
at
org.apache.xml.serialize.BaseMarkupSerializer.printDoctypeURL(BaseMarkupSerializer.java:1261)
at
org.apache.xml.serialize.BaseMarkupSerializer.unparsedEntityDecl(BaseMarkupSerializer.java:638)
at
org.apache.xml.serialize.BaseMarkupSerializer.serializeNode(BaseMarkupSerializer.java:773)
at
org.apache.xml.serialize.BaseMarkupSerializer.serialize(BaseMarkupSerializer.java:385)
at test.Test.main(Test.java:27)
// END Stack Trace
--
Andy Clark * IBM, JTC - Silicon Valley * [EMAIL PROTECTED]
