I have developed a simple dynamic FOP processor with Velocity. I used it to make dynamic pdf reports and i got very good results.

You can download it from here:

• The jar file only: velfop.jar
  You need to download velocity, fop and its dependencies from Apache.
• The source code: velfop.zip
  A Netbeans 6 project, A Basic example, and All dependency jars.

This is only a glue of two good projects from Apache.
For documentation please go to Apache projects homes.

• http://velocity.apache.org/
• http://xmlgraphics.apache.org/fop/

Example usage:

        // Velocity initialization.
        VelocityEngine ve = new VelocityEngine();
        ve.setProperty(VelocityEngine.RUNTIME_LOG_LOGSYSTEM, this);
        ve.setProperty(VelocityEngine.FILE_RESOURCE_LOADER_PATH,
            new File(".").getCanonicalPath());
        ve.init();

        // Load the context.
        Context context = new VelocityContext();
        context.put("messages", Arrays.asList(
            new String[] {"Message one", "Message Two", "Message three"}));

        // Init source template and target output.
        Template t = ve.getTemplate("src/report1.velfop");
        FileOutputStream out = new FileOutputStream(
            new File("./src/report1.pdf").getCanonicalPath());

        // Do the magic
        VelFopProcessor vfp = new VelFopProcessor();
        vfp.merge(t, context, "application/pdf", out);