R help - Mar 2011 - java+R+serverEval failed+request status: control pipe to master process is closed/broken

hi:
when I run the example program on windows XP+NetBeans:
Rserve_0.6-3\Rserve\src\client\javanew\Rserve\test\test.java
{ // test control commands (works only when enabled and in Rserve 0.6-0 and
higher only) - must be the last test since it closes the connection and shuts
down the server
   System.out.println("* Test control commands (this will fail if control
commands are disabled) ...");
   System.out.println("  server eval");
   String key = "rn" + Math.random(); // generate a random number to
prevent contamination from previous tests
                        c.serverEval("xXx<-'" + key +
"'");
   c.close();
   c = new RConnection();
   REXP x = c.eval("xXx");
   if (x == null || !x.isString() || x.length() != 1 ||
!x.asString().equals(key))
    throw new TestException("control eval test failed - assignment was not
persistent");
   c.serverEval("rm(xXx)"); // remove the test variable to not pollute
the global workspace
                       
   System.out.println("  server shutdown");
   c.serverShutdown();
   c.close();
   System.out.println("PASSED");
  }
 
It report the following error on program
statement:c.serverEval("xXx<-'" + key + "'");
org.rosuda.REngine.Rserve.RserveException: serverEval failed, request status:
control pipe to master process is closed/broken.
Perhaps the following words can help solve the problem,but,I really don't
know how to enable the control commands(on windows XP):
test control commands (works only when enabled and in Rserve 0.6-0 and higher
only).
 
                                                                                
Shi Shengfeng
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