Name: boT120536 Date: 01/30/2001


[apope@portage cib]$ java -version
java version "1.3.0beta_refresh"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0beta_refresh-b09)
Java HotSpot(TM) Client VM (build 1.3.0beta-b07, mixed mode)


With JAF 1.0.1, when DataHandler.getTransferData() can't find a
DataContentHandler for a particular MIME type, and the DataHandler was
created with a DataSource or URL, it's supposed to return an InputStream
or throw an UnsupportedFlavorException. It throws a NullPointerException
instead.

Code demonstrating the problem:

import java.awt.datatransfer.*;
import javax.activation.*;

class Test {

    static class MyDataContentHandlerFactory implements
DataContentHandlerFactory {
public DataContentHandler createDataContentHandler( String mimeType ) {
System.out.println( "DCHFactory: request for " + mimeType + " handler" );
return null; // don't have one
}
    }

    static class MyFileTypeMap extends FileTypeMap {
public String getContentType(java.io.File file) { return
"application/x-wombat"; }
public String getContentType(String filename) { return "application/x-wombat";
}
    }

    class Nombat { }

    static public void main( String args[] ) {
DataHandler.setDataContentHandlerFactory( new MyDataContentHandlerFactory() );
FileTypeMap.setDefaultFileTypeMap( new MyFileTypeMap() );
DataSource ds = new FileDataSource( "Test.java" );
DataHandler dh = new DataHandler( ds );
try {
// According to the DataHandler.getTransferData() documentation, this
// should return an InputStream:
Object data = dh.getTransferData(
new ActivationDataFlavor( java.io.InputStream.class, "application/x-wombat",
"Wombat" ) );
System.out.println( data );
} catch (Exception e) {
System.err.print("Request for InputStream threw ");
e.printStackTrace();
}
try {
// According to the DataHandler.getTransferData() documentation, this
// should throw an UnsupportedFlavorException:
Object data = dh.getTransferData(
new ActivationDataFlavor( Nombat.class, "application/not-x-wombat", "Nombat" )
);
System.out.println( data );
} catch (Exception e) {
System.err.print("Request for Nombat threw ");
e.printStackTrace();
}
    }
}

Sample output:

java -classpath .:/export/home/appc/pkg/jaf-1.0.1/activation.jar Test
DCHFactory: request for application/x-wombat handler
Request for InputStream threw java.lang.NullPointerException
at
javax.activation.DataSourceDataContentHandler.getTransferData(DataHandler.java:746)
at javax.activation.DataHandler.getTransferData(DataHandler.java:419)
at Test.main(Test.java:28)
Request for Nombat threw java.lang.NullPointerException
at
javax.activation.DataSourceDataContentHandler.getTransferData(DataHandler.java:746)
at javax.activation.DataHandler.getTransferData(DataHandler.java:419)
at Test.main(Test.java:38)
(Review ID: 109135)
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