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Import Java Custom Method in Xquery

I am using Weblogic Integration framework. While transforming one XML format to another using .xq file, I want to apply some logic written in a custom Java Class.
For example, XML1 has tag: <UnitCode>XYZ</UnitCode>
Custom Java Class:
public class unitcodemapper{
public static String getMappedUnitCode(String unitCode){
if(unitCode=="XYZ")
return <<value from DB table>>
else
return unitCode;
}
}
XML2 will have a tag: <UnitCode>unitcodemapper.getMappedUnitCode(XML1/UnitCode)</UnitCode>
I cannot find any documentation or example to do this. Can someone please help in understanding how this can be done?

This is known as an "extension function". The documentation for your XQuery implementation should have a section telling you how to write such functions and plug them into the processor. (The details may differ from one XQuery processor to another, which is why I'm referring you to the manual.)

Whilst #keshlam mentions Extension Functions, which are indeed supported by many implementations each with their own API.
I think perhaps what you are looking for instead is Java Binding from XQuery. Many implementations also support this and tend to use the same approach. I do not know whether WebLogic supports this or not! If it does, the trick is to use java: at the start of your namespace URI declaration, you can then use the fully qualified Java class name of a static class, each static method you may then call directly from that namespace.
You can from two examples of implementations that offer the same Java Binding from XQuery functionality here:
http://exist-db.org/exist/apps/doc/xquery.xml#calling-java
http://docs.basex.org/wiki/Java_Bindings
These could serve as examples for you to try on WebLogic to see if it is supported in the same way. However, I strongly suggest you check their documentation as they may take a different approach.

placeholder for any code

I need to define a object at runtime like below.
Filter rowFilter = new RowFilter(CompareFilter.CompareOp.EQUAL,
new RegexStringComparator(".*-.5"));
I am reading one String which is having code like below
String _filterString = "RowFilter(CompareFilter.CompareOp.EQUAL,
new RegexStringComparator(\".*-.5\"))";
Now I need to define a filter object by using the above String.
I know, this type of problems we can achieve by using Reflections.But I am looking for alternatives. Is there any simple way to solve problems like this?

The Java Scripting API allows embedding of miscellaneous languages like JavaScript and have bindings to Java variables and methods. In your case the language BeanShell (Java subset) can be used.

Java Compiler can be used for compiling at Runtime, but it requires a full source (Compilation Unit). I don't think a single expression can be compiled. Maybe, you can work out from here to get your objects from the classes compiled at runtime.

Custom formatter for Sun Codemodel

I'm using Java Sun Codemodel to generate java classes on the fly, and it works pretty well for me.
Now I have an additional challenge: How do I control how the code is formatted? Is there any way at all? In particular, I'd like to have all curly brackets in a new line and would like to extend the line length to let's say 130 chars.
E.g., we have a formatter that we use in Eclipse. There's no way I can just tell Codemodel to use that somehow, right?
There's this JFormatter class that kind of looks like it could be useful for something, but it doesn't look like it can do more sophisticated stuff like that.

JFormatter declared as final, so not, it isn't possible.
There's only two ways to solve the problem and continue using codemodel.
Process generated code with some another tool/library.
Redefine library classes. Find which concrete classes does unwanted formatting, then create classes with same package/name in your project and write your own implementation. There classes must appear in classpath earlier than codemodel jar.

Something like `libconfig` for Java?

I'm looking for Java framework like libconfig. I like its simple human readable configuration files and also that I can create complex setting values composed from arrays, lists, groups.
Is there anything similar for Java (not XML) ?

Looks like a simple JSON-esque format; why not just use JSON?
Commons Configuration supports a similarly-formatted config using PropertyListConfiguration.
A Groovy-based ConfigSlurper might be suitable if you're considering JVM, rather than Java-the-language, solutions. JRuby and JavaScript etc. has similar implementations.

Simple List of All Java Standard Classes and Methods?

I'm building a very simple Java parser, to look for some specific usage models. This is in no way lex/yacc or any other form of interpreter/compiler for puposes of running the code.
When I encounter a word or a set of two words separated by a dot ("word.word"), I would like to know if that's a standard Java class (and method), e.g. "Integer", or some user defined name. I'm not interested in whether the proper classes were included/imported in the code (i.e. if the code compiles well), and the extreme cases of user defined classes that override the names of standard Java classes also does not interest me. In other words: I'm okay with false negative, I'm only interesting in being "mostly" right.
If there a place wher I could find a simple list of all the names of all Java standard classes and methods, in the form easily saved into a text file or database? (J2SE is okay, but J2EE is better). I'm familiar with http://java.sun.com/j2se/ etc, but it seems I need a terrible amount of manual work to extract all the names from there. Also, the most recent JDK is not neccesary, I can live with 1.4 or 1.5.
Clarification: I'm not working in Java but in Python, so I can't use Java-specific commands in my parsing mechanism.
Thanks

What's wrong with the javadoc? The index lists all classes, methods, and static variables. You can probably grep for parenthesis.

To get all classes and methods you can look at the index on
http://java.sun.com/javase/6/docs/api/index-files/index-1.html
This will be 10's of thousands classes and method which can be overwhelming.
I suggest instead you use auto-complete in your IDE. This will show you all the matching classes/methods appropriate based on context.
e.g. say you have a variable
long time = System.
This will show you all the methods in System which return a long value, such as
long time = System.nanoTime();
Even if you know a lot of the method/classes, this can save you a lot of typing.

If you just want to create a list of all classes in Java and their methods (so that you can populate a database or an XML file), you may want to write an Eclipse-plugin that looks at the entire JavaCore model, and scans all of its classes (e.g., by searching all subtypes of Object). Then enumerate all the methods. You can do that technically to any library by including it in your context.

IBM had a tool for creating XML from JavaDocs, if I am not mistaken:
http://www.ibm.com/developerworks/xml/library/x-tipjdoc/index.html

There's also an option to either parse classlist file from jre/lib folder or open the jsse.jar file, list all classes there and make a list of them in dot-separated form by yourself.

When I encounter a word or a set of two words separated by a dot ("word.word"), I would like to know if that's a standard Java class (and method), e.g. "Integer", or some user defined name.
If thats what you're after, you could do without a (limited) list of Java Classes by using some simple reflection:
http://java.sun.com/developer/technicalArticles/ALT/Reflection/
try {
Class.forName("word.word");
System.out.println("This is a valid class!");
} catch (ClassNotFoundException e) {
System.out.println("This is not a valid class.");
}
Something like this should be enough for your purposes, with he added benefit of not being limited to a subset of classes, and extensible by any libraries on the classpath.