Hello,
I have some Java code that must work for Java 1.4.2 and must use dom4j from
dynamically loaded code. Unfortunately, I get an exception from dom4j when
I use it.
Here's a minimal program that exhibits the error followed by the error
message itself. (This program works just fine with Java 1.6 BTW, I just
can't use that version.)
I'm hoping someone familiar with the dom4j code can suggest some classes to
explicitly load to avoid this problem. Or, perhaps I need to use an older
version of dom4j (currently using 1.6.1)? I know this code worked for some
version of Java 1.4 and some version of dom4j in the past. I just don't
know what the magical combination was.
Thanks,
Bradford C. Smith
==== Main.java ====
package test;
import java.lang.reflect.Method;
public class Main {
/**
* @param args
*/
public static void main(String[] args) {
Class cl;
try {
cl = Class.forName("test.Dynamic");
Method m = cl.getMethod("run", null);
m.invoke(cl, null);
} catch (Exception e) {
e.printStackTrace();
}
}
}
==== Dynamic.java ====
package test;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
public class Dynamic {
public static void run() {
Document doc = DocumentHelper.createDocument();
doc.addElement("startup");
System.out.println("A dynamic \"Hello!\" to you.");
}
}
==== end Dynamic.java ====
The exception stack trace I get is this:
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at test.Main.main(Main.java:15)
Caused by: java.lang.ExceptionInInitializerError
at org.dom4j.QName.<init>(QName.java:69)
at org.dom4j.tree.QNameCache.createQName(QNameCache.java:236)
at org.dom4j.tree.QNameCache.get(QNameCache.java:94)
at org.dom4j.DocumentFactory.createQName(DocumentFactory.java:203)
at org.dom4j.DocumentFactory.createElement(DocumentFactory.java:148)
at org.dom4j.tree.AbstractDocument.addElement(AbstractDocument.java:172)
at test.Dynamic.run(Dynamic.java:9)
... 5 more
Caused by: java.lang.NullPointerException
at org.dom4j.tree.NamespaceCache.getURICache(NamespaceCache.java:154)
at org.dom4j.tree.NamespaceCache.get(NamespaceCache.java:84)
at org.dom4j.Namespace.<clinit>(Namespace.java:28)
... 12 more
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