PM19633: Java compiler produces the 'No unique maximal instance exists' error

Rational Software Architect Standard Edition, Version 7.5.5.4
Rational Application Developer for WebSphere Software, Version 7.5.5.4

APAR status

• Closed as program error.

Error description

• Environment:
  - Operating System: Microsoft Windows XP
    - Product name: Rational Software Architect 7.5.0
  
  Description of problem:
  Java compiler produces 'No unique maximal instance exists' error
  
  This APAR is to include APAR IZ81205 for IBM SDK 1.6 SR2 into Ra
  tional Software Architect.
  
  Step to reproduce:
  1. Create a Java source file GenericTest2.java with the followin
  g source code (between [code] and [/code]):
  [code]
  import java.io.FileInputStream;
  import java.io.ObjectInputStream;
  
  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 FileInputStr
  eam(file)));
          // closing the stream in finally removed to get a small
  example
      }
  
      @SuppressWarnings('unchecked')
      public static ?T? T readObject(ObjectInputStream stream) thr
  ows Exception {
          return (T)stream.readObject();
      }
  }
  [/code]
  2. Call on the command line ?SDP?\jdk\bin\javac.exe GenericTest2
  .java where ?SDP? is the installation directory of RSA (e.g. 'C:
  \Program Files\SDP'
  Result:
  javac exists and prints the following error:
  'type parameters of T cannot be determined; no unique maximal in
  stance exists for type
  variable T with upper bounds T, java.lang.Object return readObje
  ct(new ObjectInputStream(new
  FileInputStream(file)));'
  
  Workaround:
  None
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The version of java compiler in Rational Software Architect
  7.5 contains defects.
  

Problem conclusion

• We have upgraded the java compiler version in Rational
  Software Architect 7.5.5.4 to the newest one.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  RSA-SE WIN

• Fixed component ID

  5724V8800

Applicable component levels

• R755 PSN

     UP