Problem copying file using ANT API

[Shiladitya . Ghosh]

Hi,

I am a very new user  of ANT so plz excuse what could eb a elementary
question.I am simply trying to copy a jar file to a destination
directory.The code I am using is:

                Copy cpy = new Copy();
                File file = new File("D://WrkingFolder//src//caps.jar");
                File trgDir = new File("D://antTest");
                cpy.setFile(file);
                cpy.setTodir(trgDir);
                cpy.execute();

        

This is the error message that I am being shown:

Exception in thread "main" java.lang.NullPointerException
        at org.apache.tools.ant.Task.log(Task.java:207)
        at org.apache.tools.ant.Task.log(Task.java:197)
        at
org.apache.tools.ant.taskdefs.Copy.doFileOperations(Copy.java:351)
        at org.apache.tools.ant.taskdefs.Copy.execute(Copy.java:254)
        at AntTest.main(AntTest.java:25)


        Secondly,could I get any detailed  ANT APIs . 

        Thanks,
        aditya 

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