Program: 131842
Project: 131842
Buggy source:
/** 
 * Indicates whether the engine has been configured correctly and is ready for operation. In more advanced engines, the result of this method should be taken as a suggestion and not as a prerequisite to operate the engine.
 * @param message (if not null) contains the configuration errors of theengine
 * @return whether the engine is ready to operate
 */
public boolean isReady(StringBuilder message){
  message.setLength(0);
  if (this.inputVariables.isEmpty()) {
    message.append("String_Node_Str");
  }
  for (int i=0; i < this.inputVariables.size(); ++i) {
    InputVariable inputVariable=this.inputVariables.get(i);
    if (inputVariable == null) {
      message.append(String.format("String_Node_Str",i));
    }
  }
  if (this.outputVariables.isEmpty()) {
    message.append("String_Node_Str");
  }
  for (int i=0; i < this.outputVariables.size(); ++i) {
    OutputVariable outputVariable=this.outputVariables.get(i);
    if (outputVariable == null) {
      message.append(String.format("String_Node_Str",i));
    }
 else {
      if (outputVariable.getTerms().isEmpty()) {
        message.append(String.format("String_Node_Str",outputVariable.getName()));
      }
      Defuzzifier defuzzifier=outputVariable.getDefuzzifier();
      if (defuzzifier == null) {
        message.append(String.format("String_Node_Str",outputVariable.getName()));
      }
 else       if (defuzzifier instanceof IntegralDefuzzifier && outputVariable.fuzzyOutput().getAggregation() == null) {
        message.append(String.format("String_Node_Str",outputVariable.getName()));
      }
    }
  }
  if (this.ruleBlocks.isEmpty()) {
    message.append("String_Node_Str");
  }
  for (int i=0; i < this.ruleBlocks.size(); ++i) {
    RuleBlock ruleBlock=this.ruleBlocks.get(i);
    if (ruleBlock == null) {
      message.append(String.format("String_Node_Str",i));
    }
 else {
      if (ruleBlock.getRules().isEmpty()) {
        message.append(String.format("String_Node_Str",ruleBlock.getName()));
      }
      int requiresConjunction=0;
      int requiresDisjunction=0;
      int requiresImplication=0;
      for (int r=0; r < this.ruleBlocks.size(); ++r) {
        Rule rule=ruleBlock.getRule(r);
        if (rule == null) {
          message.append(String.format("String_Node_Str",ruleBlock.getName(),r));
        }
 else {
          int thenIndex=rule.getText().indexOf("String_Node_Str" + Rule.FL_THEN + "String_Node_Str");
          int andIndex=rule.getText().indexOf("String_Node_Str" + Rule.FL_AND + "String_Node_Str");
          int orIndex=rule.getText().indexOf("String_Node_Str" + Rule.FL_OR + "String_Node_Str");
          if (andIndex != -1 && andIndex < thenIndex) {
            ++requiresConjunction;
          }
          if (orIndex != -1 && orIndex < thenIndex) {
            ++requiresDisjunction;
          }
          if (rule.isLoaded()) {
            Consequent consequent=rule.getConsequent();
            for (            Proposition proposition : consequent.getConclusions()) {
              Variable variable=proposition.getVariable();
              if (variable instanceof OutputVariable) {
                OutputVariable outputVariable=(OutputVariable)variable;
                if (outputVariable.getDefuzzifier() instanceof IntegralDefuzzifier) {
                  ++requiresImplication;
                  break;
                }
              }
            }
          }
        }
      }
      if (requiresConjunction > 0 && ruleBlock.getConjunction() == null) {
        message.append(String.format("String_Node_Str",ruleBlock.getName()));
        message.append(String.format("String_Node_Str",ruleBlock.getName(),requiresConjunction));
      }
      if (requiresDisjunction > 0 && ruleBlock.getDisjunction() == null) {
        message.append(String.format("String_Node_Str",ruleBlock.getName()));
        message.append(String.format("String_Node_Str",ruleBlock.getName(),requiresDisjunction));
      }
      if (requiresImplication > 0 && ruleBlock.getImplication() == null) {
        message.append(String.format("String_Node_Str",ruleBlock.getName()));
        message.append(String.format("String_Node_Str",ruleBlock.getName(),requiresImplication));
      }
    }
  }
  return message.length() == 0;
}

Fixed version (ground truth):
/** 
 * Indicates whether the engine has been configured correctly and is ready for operation. In more advanced engines, the result of this method should be taken as a suggestion and not as a prerequisite to operate the engine.
 * @param message (if not null) contains the configuration errors of theengine
 * @return whether the engine is ready to operate
 */
public boolean isReady(StringBuilder message){
  message.setLength(0);
  if (this.inputVariables.isEmpty()) {
    message.append("String_Node_Str");
  }
  for (int i=0; i < this.inputVariables.size(); ++i) {
    InputVariable inputVariable=this.inputVariables.get(i);
    if (inputVariable == null) {
      message.append(String.format("String_Node_Str",i));
    }
  }
  if (this.outputVariables.isEmpty()) {
    message.append("String_Node_Str");
  }
  for (int i=0; i < this.outputVariables.size(); ++i) {
    OutputVariable outputVariable=this.outputVariables.get(i);
    if (outputVariable == null) {
      message.append(String.format("String_Node_Str",i));
    }
 else {
      if (outputVariable.getTerms().isEmpty()) {
        message.append(String.format("String_Node_Str",outputVariable.getName()));
      }
      Defuzzifier defuzzifier=outputVariable.getDefuzzifier();
      if (defuzzifier == null) {
        message.append(String.format("String_Node_Str",outputVariable.getName()));
      }
 else       if (defuzzifier instanceof IntegralDefuzzifier && outputVariable.fuzzyOutput().getAggregation() == null) {
        message.append(String.format("String_Node_Str",outputVariable.getName()));
      }
    }
  }
  if (this.ruleBlocks.isEmpty()) {
    message.append("String_Node_Str");
  }
  for (int i=0; i < this.ruleBlocks.size(); ++i) {
    RuleBlock ruleBlock=this.ruleBlocks.get(i);
    if (ruleBlock == null) {
      message.append(String.format("String_Node_Str",i));
    }
 else {
      if (ruleBlock.getRules().isEmpty()) {
        message.append(String.format("String_Node_Str",ruleBlock.getName()));
      }
      int requiresConjunction=0;
      int requiresDisjunction=0;
      int requiresImplication=0;
      for (int r=0; r < ruleBlock.numberOfRules(); ++r) {
        Rule rule=ruleBlock.getRule(r);
        if (rule == null) {
          message.append(String.format("String_Node_Str",ruleBlock.getName(),r));
        }
 else {
          int thenIndex=rule.getText().indexOf("String_Node_Str" + Rule.FL_THEN + "String_Node_Str");
          int andIndex=rule.getText().indexOf("String_Node_Str" + Rule.FL_AND + "String_Node_Str");
          int orIndex=rule.getText().indexOf("String_Node_Str" + Rule.FL_OR + "String_Node_Str");
          if (andIndex != -1 && andIndex < thenIndex) {
            ++requiresConjunction;
          }
          if (orIndex != -1 && orIndex < thenIndex) {
            ++requiresDisjunction;
          }
          if (rule.isLoaded()) {
            Consequent consequent=rule.getConsequent();
            for (            Proposition proposition : consequent.getConclusions()) {
              Variable variable=proposition.getVariable();
              if (variable instanceof OutputVariable) {
                OutputVariable outputVariable=(OutputVariable)variable;
                if (outputVariable.getDefuzzifier() instanceof IntegralDefuzzifier) {
                  ++requiresImplication;
                  break;
                }
              }
            }
          }
        }
      }
      if (requiresConjunction > 0 && ruleBlock.getConjunction() == null) {
        message.append(String.format("String_Node_Str",ruleBlock.getName()));
        message.append(String.format("String_Node_Str",ruleBlock.getName(),requiresConjunction));
      }
      if (requiresDisjunction > 0 && ruleBlock.getDisjunction() == null) {
        message.append(String.format("String_Node_Str",ruleBlock.getName()));
        message.append(String.format("String_Node_Str",ruleBlock.getName(),requiresDisjunction));
      }
      if (requiresImplication > 0 && ruleBlock.getImplication() == null) {
        message.append(String.format("String_Node_Str",ruleBlock.getName()));
        message.append(String.format("String_Node_Str",ruleBlock.getName(),requiresImplication));
      }
    }
  }
  return message.length() == 0;
}