[jira] Created: (CLI-144) adding a FileValidator results in ClassCastException in parser.parseAndHelp(args)

[David Biesack (JIRA)]

adding a FileValidator results in ClassCastException in 
parser.parseAndHelp(args)
---------------------------------------------------------------------------------

                 Key: CLI-144
                 URL: https://issues.apache.org/jira/browse/CLI-144
             Project: Commons CLI
          Issue Type: Bug
          Components: CLI-2.x
    Affects Versions: 2.0
         Environment: Windows XP
            Reporter: David Biesack


When I add a FileValidator.getExistingFileInstance() to an Argument, I get a 
ClassCastException when I parse args.

Below is a testcase invoke with

   java org.apache.commons.cli2.issues.CLI2Sample -classpath 
commons-cli-2.0-SNAPSHOT.jar --file-name path-to-an-existing-file

Run it and you get:

Exception in thread "main" java.lang.ClassCastException: java.io.File cannot be 
cast to java.lang.String
        at 
org.apache.commons.cli2.validation.FileValidator.validate(FileValidator.java:122)
        at 
org.apache.commons.cli2.option.ArgumentImpl.validate(ArgumentImpl.java:250)
        at 
org.apache.commons.cli2.option.ParentImpl.validate(ParentImpl.java:123)
        at 
org.apache.commons.cli2.option.DefaultOption.validate(DefaultOption.java:175)
        at org.apache.commons.cli2.option.GroupImpl.validate(GroupImpl.java:264)
        at org.apache.commons.cli2.commandline.Parser.parse(Parser.java:105)
        at 
org.apache.commons.cli2.commandline.Parser.parseAndHelp(Parser.java:125)
        at org.apache.commons.cli2.issues.CLI2Sample.main(CLI2Sample.java:38)

Comment out the withValidator call and it runs with no exception. 

I also get a similar ClassCastException if I add a 

  .withValidator(NumberValidator.getIntegerInstance())

to another option/argument.

package org.apache.commons.cli2.issues;

import java.io.File;
import org.apache.commons.cli2.CommandLine;
import org.apache.commons.cli2.Group;
import org.apache.commons.cli2.builder.ArgumentBuilder;
import org.apache.commons.cli2.builder.DefaultOptionBuilder;
import org.apache.commons.cli2.builder.GroupBuilder;
import org.apache.commons.cli2.commandline.Parser;
import org.apache.commons.cli2.option.DefaultOption;
import org.apache.commons.cli2.validation.FileValidator;

public class CLI2Sample
{
   public static void main(String[] args)
   {
      final DefaultOptionBuilder obuilder = new DefaultOptionBuilder();
      final ArgumentBuilder abuilder = new ArgumentBuilder();
      final GroupBuilder gbuilder = new GroupBuilder();
      DefaultOption fileNameOption = obuilder//
            .withShortName("f")//
            .withLongName("file-name")//
            .withRequired(true)//
            .withDescription("Name of dense data file containing NxM double 
matrix") //
            .withArgument(abuilder//
                  .withName("file-name")//
                  .withValidator(FileValidator.getExistingFileInstance())//
                  .create())//
            .create();
      Group options = gbuilder//
            .withName("options")//
            .withOption(fileNameOption)//
            .create();
      Parser parser = new Parser();
      parser.setHelpTrigger("--help");
      parser.setGroup(options);
      CommandLine cl = parser.parseAndHelp(args);
     }
}


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