feat: catch ClassCastException instead of Exception

Author: Wenhua Zhang

framework/src/main/java/org/tron/core/services/jsonrpc/TronJsonRpcImpl.java

@@ -731,7 +731,7 @@ public String getCall(CallArguments transactionCall, Object blockParamObj)
       if (paramMap.containsKey("blockNumber")) {
         try {
           blockNumOrTag = paramMap.get("blockNumber");
-        } catch (Exception e) {
+        } catch (ClassCastException e) {
           throw new JsonRpcInvalidRequestException(JSON_ERROR);
         }
 
@@ -749,7 +749,7 @@ public String getCall(CallArguments transactionCall, Object blockParamObj)
       } else if (paramMap.containsKey("blockHash")) {
         try {
           blockNumOrTag = paramMap.get("blockHash");
-        } catch (Exception e) {
+        } catch (ClassCastException e) {
           throw new JsonRpcInvalidRequestException(JSON_ERROR);
         }