docs: public final void unaryExpression() throws RecognitionException {
  		int unaryExpression_StartIndex = input.index();
  
  		try {
  			if ( state.backtracking>0 && alreadyParsedRule(input, 124) ) { return; }
  
  			// src/main/resources/org/drools/compiler/semantics/java/parser/Java.g:1196:5: ( '+' unaryExpression | '-' unaryExpression | '++' primary | '--' primary | unaryExpressionNotPlusMinus )
  			int alt156=5;
  			switch ( input.LA(1) ) {
  			case 40:
  				{
  				alt156=1;
  				}
  				break;
  			case 44:
  				{
  				alt156=2;
  				}
  				break;
  			case 41:
  				{
  				alt156=3;
  				}
  				break;
  			case 45:
  				{
  				alt156=4;
  				}
  				break;
  			case CharacterLiteral:
  			case DecimalLiteral:
  			case FloatingPointLiteral:
  			case HexLiteral:
  			case Identifier:
  			case OctalLiteral:
  			case StringLiteral:
  			case 29:
  			case 36:
  			case 53:
  			case 65:
  			case 67:
  			case 70:
  			case 71:
  			case 77:
  			case 79:
  			case 80:
  			case 82:
  			case 85:
  			case 92:
  			case 94:
  			case 97:
  			case 98:
  			case 105:
  			case 108:
  			case 111:
  			case 115:
  			case 118:
  			case 126:
  				{
  				alt156=5;
  				}
  				break;
  			default:
  				if (state.backtracking>0) {state.failed=true; return;}
  				NoViableAltException nvae =
  					new NoViableAltException("", 156, 0, input);
  				throw nvae;
  			}
  			switch (alt156) {
  				case 1 :
  					// src/main/resources/org/drools/compiler/semantics/java/parser/Java.g:1196:9: '+' unaryExpression
  					{
  					match(input,40,FOLLOW_40_in_unaryExpression5484); if (state.failed) return;
  					pushFollow(FOLLOW_unaryExpression_in_unaryExpression5486);
  					unaryExpression();
  					state._fsp--;
  					if (state.failed) return;
  					}
  					break;
  				case 2 :
  					// src/main/resources/org/drools/compiler/semantics/java/parser/Java.g:1197:7: '-' unaryExpression
  					{
  					match(input,44,FOLLOW_44_in_unaryExpression5494); if (state.failed) return;
  					pushFollow(FOLLOW_unaryExpression_in_unaryExpression5496);
  					unaryExpression();
  					state._fsp--;
  					if (state.failed) return;
  					}
  					break;
  				case 3 :
  					// src/main/resources/org/drools/compiler/semantics/java/parser/Java.g:1198:9: '++' primary
  					{
  					match(input,41,FOLLOW_41_in_unaryExpression5506); if (state.failed) return;
  					pushFollow(FOLLOW_primary_in_unaryExpression5508);
  					primary();
  					state._fsp--;
  					if (state.failed) return;
  					}
  					break;
  				case 4 :
  					// src/main/resources/org/drools/compiler/semantics/java/parser/Java.g:1199:9: '--' primary
  					{
  					match(input,45,FOLLOW_45_in_unaryExpression5518); if (state.failed) return;
  					pushFollow(FOLLOW_primary_in_unaryExpression5520);
  					primary();
  					state._fsp--;
  					if (state.failed) return;
  					}
  					break;
  				case 5 :
  					// src/main/resources/org/drools/compiler/semantics/java/parser/Java.g:1200:9: unaryExpressionNotPlusMinus
  					{
  					pushFollow(FOLLOW_unaryExpressionNotPlusMinus_in_unaryExpression5530);
  					unaryExpressionNotPlusMinus();
  					state._fsp--;
  					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, 124, unaryExpression_StartIndex); }
  
  		}
  	}