docs: public final void constantExpression() throws RecognitionException {
  		int constantExpression_StartIndex = input.index();
  
  		try {
  			if ( state.backtracking>0 && alreadyParsedRule(input, 107) ) { return; }
  
  			// src/main/resources/org/drools/compiler/semantics/java/parser/Java.g:1115:5: ( expression )
  			// src/main/resources/org/drools/compiler/semantics/java/parser/Java.g:1115:7: expression
  			{
  			pushFollow(FOLLOW_expression_in_constantExpression4858);
  			expression();
  			state._fsp--;
  			if (state.failed) return;
  			}
  
  		}
  		catch (RecognitionException re) {
  			reportError(re);
  			recover(input,re);
  		}
  		finally {
  			// do for sure before leaving
  			if ( state.backtracking>0 ) { memoize(input, 107, constantExpression_StartIndex); }
  
  		}
  	}