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Date: Fri, 31 Jul 2009 12:46:08 -0700
Message-ID: <1ba4850e0907311246h2514971fs9f29110d651d244@mail.gmail.com>
Subject: Null pointer error with ReflectData.getProtocol
From: tazan007 <tazan007@gmail.com>
To: avro-user@hadoop.apache.org
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Hi guys, I am experimenting with avro and trying to generate a protocol from
an existing class.  As as test, I created this class:

public class Hello {
    public void hello(String name)
    {
        System.out.println("Hello " +name);
    }
}

I am using the following method to create the procotol:

        ReflectData.getProtocol(Hello.class);

And here is the exception I am getting:

Exception in thread "main" java.lang.NullPointerException
    at
org.apache.avro.reflect.ReflectData.createSchema(ReflectData.java:153)
    at
org.apache.avro.reflect.ReflectData.createSchema(ReflectData.java:183)
    at org.apache.avro.reflect.ReflectData.getMessage(ReflectData.java:228)
    at org.apache.avro.reflect.ReflectData.getProtocol(ReflectData.java:204)
    at
com.ask.tiburon.frill.test.AvroProtocolGenerator.main(AvroProtocolGenerator.java:36)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)

I am using the avro 1.0 jars/source.

Any ideas to what I am doing wrong would be appreciated.  I do have
PARANAMER being run and the following code does show the parameter names:

         try
        {
            Method[] methods = Hello.class.getMethods();
            Paranamer paranamer = new CachingParanamer();

            for(Method method: methods)
            {
                String[] parameterNames =
paranamer.lookupParameterNames(method);
                System.out.println(method.getName() + " : ");
                for(String name : parameterNames)
                {
                    System.out.println("\t" + name);
                }
            }

        } catch (Exception e)
        {
            System.out.println("Exception: " + e.getMessage());
        }

Thanks,
Hiral

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