docs: public final void shiftOp() throws RecognitionException {
  		int shiftOp_StartIndex = input.index();
  
  		try {
  			if ( state.backtracking>0 && alreadyParsedRule(input, 121) ) { return; }
  
  			// src/main/resources/org/drools/compiler/semantics/java/parser/Java.g:1183:5: ( ( '<' '<' | '>' '>' '>' | '>' '>' ) )
  			// src/main/resources/org/drools/compiler/semantics/java/parser/Java.g:1183:7: ( '<' '<' | '>' '>' '>' | '>' '>' )
  			{
  			// src/main/resources/org/drools/compiler/semantics/java/parser/Java.g:1183:7: ( '<' '<' | '>' '>' '>' | '>' '>' )
  			int alt153=3;
  			int LA153_0 = input.LA(1);
  			if ( (LA153_0==53) ) {
  				alt153=1;
  			}
  			else if ( (LA153_0==56) ) {
  				int LA153_2 = input.LA(2);
  				if ( (LA153_2==56) ) {
  					int LA153_3 = input.LA(3);
  					if ( (synpred228_Java()) ) {
  						alt153=2;
  					}
  					else if ( (true) ) {
  						alt153=3;
  					}
  
  				}
  
  				else {
  					if (state.backtracking>0) {state.failed=true; return;}
  					int nvaeMark = input.mark();
  					try {
  						input.consume();
  						NoViableAltException nvae =
  							new NoViableAltException("", 153, 2, input);
  						throw nvae;
  					} finally {
  						input.rewind(nvaeMark);
  					}
  				}
  
  			}
  
  			else {
  				if (state.backtracking>0) {state.failed=true; return;}
  				NoViableAltException nvae =
  					new NoViableAltException("", 153, 0, input);
  				throw nvae;
  			}
  
  			switch (alt153) {
  				case 1 :
  					// src/main/resources/org/drools/compiler/semantics/java/parser/Java.g:1183:8: '<' '<'
  					{
  					match(input,53,FOLLOW_53_in_shiftOp5373); if (state.failed) return;
  					match(input,53,FOLLOW_53_in_shiftOp5375); if (state.failed) return;
  					}
  					break;
  				case 2 :
  					// src/main/resources/org/drools/compiler/semantics/java/parser/Java.g:1183:18: '>' '>' '>'
  					{
  					match(input,56,FOLLOW_56_in_shiftOp5379); if (state.failed) return;
  					match(input,56,FOLLOW_56_in_shiftOp5381); if (state.failed) return;
  					match(input,56,FOLLOW_56_in_shiftOp5383); if (state.failed) return;
  					}
  					break;
  				case 3 :
  					// src/main/resources/org/drools/compiler/semantics/java/parser/Java.g:1183:32: '>' '>'
  					{
  					match(input,56,FOLLOW_56_in_shiftOp5387); if (state.failed) return;
  					match(input,56,FOLLOW_56_in_shiftOp5389); if (state.failed) return;
  					}
  					break;
  
  			}
  
  			}
  
  		}
  		catch (RecognitionException re) {
  			reportError(re);
  			recover(input,re);
  		}
  		finally {
  			// do for sure before leaving
  			if ( state.backtracking>0 ) { memoize(input, 121, shiftOp_StartIndex); }
  
  		}
  	}