Fix compilation issue due to generic Exception

After modifying common to remove generic Exceptions, drools-pdp would
no longer compile.  Had to modify drools-pdp to accomodate the
specific exception.

Change-Id: Ib804da2ebfc7dbf5f4035ba3d48832ffe541f902
Issue-ID: POLICY-246
Signed-off-by: Jim Hahn <jrh3@att.com>
diff --git a/feature-state-management/src/main/java/org/onap/policy/drools/statemanagement/DroolsPDPIntegrityMonitor.java b/feature-state-management/src/main/java/org/onap/policy/drools/statemanagement/DroolsPDPIntegrityMonitor.java
index 382f01e..46bba91 100644
--- a/feature-state-management/src/main/java/org/onap/policy/drools/statemanagement/DroolsPDPIntegrityMonitor.java
+++ b/feature-state-management/src/main/java/org/onap/policy/drools/statemanagement/DroolsPDPIntegrityMonitor.java
@@ -430,14 +430,14 @@
 		}
   	}
 
-	public static DroolsPDPIntegrityMonitor getInstance() throws Exception{
+	public static DroolsPDPIntegrityMonitor getInstance() throws IntegrityMonitorException{
 		if(logger.isDebugEnabled()){
 			logger.debug("getInstance() called");
 		}
 		if (im == null) {
 			String msg = "No DroolsPDPIntegrityMonitor instance exists."
 					+ " Please use the method DroolsPDPIntegrityMonitor init(String configDir)";
-			throw new Exception(msg);
+			throw new IntegrityMonitorException(msg);
 		}else{
 			return im;
 		}