Following PSARC/1997/123, the solaris exec() mechanism was updated to provide
 for executing jar executables.

 The 1.2 documentation at:
   http://java.sun.com/products/jdk/1.2/docs/guide/extensions/spec.html#javacmd

 indicates that a Manifest entry of Main-Class will create an executable jar
 file and:

  The Solaris 2.6 kernel has already been extended to recognize the special
  "magic" number that identifies a JAR file, and to invoke java -jar on such
  a JAR file as if it were a native Solaris executable. A Java application
  packaged in a JAR file can thus be executed directly from the command line
  or by clicking an icon on the CDE desktop.

 Although the Main-Class entry creates a jar executable suitable for use with
 java -jar:

% javac HelloWorld.java

% cat META-INF/MANIFEST.MF
Manifest-version: 1.0
Main-Class: HelloWorld
Name: HelloWorld.class

% jar -native -cvmf META-INF/MANIFEST.MF HelloWorld HelloWorld.class
adding: HelloWorld.class (in=472) (out=316) (deflated 33%)

% java -native -new -jar HelloWorld
Hello world!

 This file can not be executed directly:

% chmod +x HelloWorld
% HelloWorld
./HelloWorld: syntax error at line 1: `)' unexpected

 truss(1) reveals:

 609: execve("./HelloWorld", 0x00052948, 0x00052950) Err#8 ENOEXEC