First change is required because in case we have EXPORTS parser goes inn infinite loop. Also this change must be applied to SmiGrammar.jcc

Second change is required in order to check for optional node list and check it only if it is present.

com/mod_snmp/SmiParser/Grammar/SmiGrammar.java

@@ -389,7 +389,7 @@
Token tok;
while ( true ) {
tok = getToken(1);

•    if ((tok.kind == SEMI_COLON_T) && (tok.kind == IMPORTS_T)) {
  

•    if ((tok.kind == SEMI_COLON_T) || (tok.kind == IMPORTS_T)) {
       break;
   }
   if (tok.kind != COMMA_T) {
  

com/mod_snmp/SmiParser/Semantics/SemanticsCheck.java
@@ -536,13 +536,17 @@
if (n.module_id.present()) {
msg = "not defined in this module '" + n.module_id + "'";
table = ModuleHashTable.lookup(n.module_id.toString());

•            checkVariablesDefined(((NodeList)n.mandatory_part.node),
  

•                  ModuleHashTable.lookup(n.module_id.toString()),
  

•                  msg);
  

•            if (n.mandatory_part.present()) {
  

•                checkVariablesDefined(((NodeList)n.mandatory_part.node),
  

•                    ModuleHashTable.lookup(n.module_id.toString()),
  

•                    msg);
  

•            }
       } else {
           msg = "not defined in this module";
           table = current;
  

•            checkVariablesDefined(((NodeList)n.mandatory_part.node));
  

•            if (n.mandatory_part.present()) {
  

•                checkVariablesDefined(((NodeList)n.mandatory_part.node));
  

•            }
       }
       if (n.compliance_part.present()) {
           Enumeration e = n.compliance_part.elements();