Symptom

Using the default compilation mechanism of Rational Software Architect v7.5.x works as expected, but compiling with Javac option fails.

1. Use the following source code
   
   
public class GenericsTest2 {

   public static void main(String[] args) throws Exception {
       Integer i = readObject(args[0]);
       System.out.println(i);
   }

   public static <T> T readObject(String file) throws Exception {
       return readObject(new ObjectInputStream(new
fileInputStream(file)));
       // closing the stream in finally removed to get a small example
   }

   @SuppressWarnings("unchecked")
   public static <T> T readObject(ObjectInputStream stream) throws Exception {
       return (T)stream.readObject();
   }
}

   
   
2. Compile using command line option
   
   C:\Program Files\IBM\SDP\jdk\bin\javac.exe GenericsTest2.java
   

Actual result:
The following exception is produced:


type parameters of T cannot be determined; no unique maximal instance exists for type variable T with upper bounds T, java.lang.Object return readObject(new ObjectInputStream(new FileInputStream(file)));