The following works:

  |       // Create a test.Info class with a static String version = "Version 
1.0"
  |       ClassPool defaultPool = ClassPool.getDefault();
  |       ClassPool classes1Pool = new ClassPool(defaultPool);
  |       CtClass info = classes1Pool.makeClass("test.Info");
  |       // Don't let javassist optimize the class so we can modify it after 
writing it out
  |       info.stopPruning(true);
  |       CtClass s = classes1Pool.get("java.lang.String");
  |       CtField version = new CtField(s, "version", info);
  |       version.setModifiers(Modifier.PUBLIC | Modifier.STATIC);
  |       info.addField(version, CtField.Initializer.constant("Version 1.0"));
  |       info.writeFile(classes1.getAbsolutePath());
  | 
  |       // Create a test.Info class with a static String version = "Version 
2.0"
  |       ClassPool classes2Pool = new ClassPool(defaultPool);
  |       info = classes2Pool.makeClass("test.Info");
  |       File classes2 = new File(libDir, "classes2");
  |       classes2.mkdir();
  |       version = new CtField(s, "version", info);
  |       version.setModifiers(Modifier.PUBLIC | Modifier.STATIC);
  |       info.addField(version, CtField.Initializer.constant("Version 2.0"));  
    
  |       info.writeFile(classes2.getAbsolutePath());
  | 


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