output: #fixed code
                                  public Object execute(Object ctx, Map tokens, TemplateRegistry registry) {
          synchronized (Runtime.getRuntime()) {
  
              if (nodes == null) {
                  return new String(expression);
              }
              else if (nodes.length == 2) {
                  /**
                   * This is an optimization for property expressions.
                   */
                  switch (nodes[0].getToken()) {
                      case PROPERTY_EX:
                          //noinspection unchecked
                          if (!cacheAggressively) {
                              char[] seg = new char[expression.length - 3];
                              arraycopy(expression, 2, seg, 0, seg.length);
  
                              return MVEL.eval(seg, ctx, tokens);
                          }
                          else {
                              String s = new String(expression, 2, expression.length - 3);
                              if (!EX_PRECOMP_CACHE.containsKey(s)) {
                                  synchronized (EX_PRECOMP_CACHE) {
                                      EX_PRECOMP_CACHE.put(s, compileExpression(s));
                                      return executeExpression(EX_PRECOMP_CACHE.get(s), ctx, tokens);
                                  }
                              }
                              else {
                                  return executeExpression(EX_PRECOMP_CACHE.get(s), ctx, tokens);
                              }
  
                          }
                      case LITERAL:
                          return new String(expression);
  
                  }
  
                  return new String(expression);
              }
  
              Object register = null;
  
              StringAppender sbuf = new StringAppender(10);
              Node currNode = null;
  
              try {
                  //noinspection unchecked
                  MVELInterpretedRuntime oParser = new MVELInterpretedRuntime(ctx, tokens);
  
                  initStack();
                  pushAndForward();
  
                  while ((currNode = pop()) != null) {
                      node = currNode.getNode();
  
                      switch (currNode.getToken()) {
                          case LITERAL: {
                              sbuf.append(register = new String(expression, currNode.getStartPos(),
                                      currNode.getEndPos() - currNode.getStartPos()));
                              break;
                          }
                          case PROPERTY_EX: {
                              sbuf.append(
                                      valueOf(register = oParser.setExpressionArray(getInternalSegment(currNode)).parse())
                              );
                              break;
                          }
                          case IF:
                          case ELSEIF: {
                              try {
                                  if (!((Boolean) oParser.setExpressionArray(getInternalSegment(currNode)).parse())) {
                                      exitContext();
                                  }
                              }
                              catch (ClassCastException e) {
                                  throw new CompileException("IF expression does not return a boolean: " + new String(getSegment(currNode)));
                              }
                              break;
                          }
                          case FOREACH: {
                              ForeachContext foreachContext = (ForeachContext) currNode.getRegister();
                              if (foreachContext.getItererators() == null) {
                                  try {
                                      String[] lists = getForEachSegment(currNode).split(",");
                                      Iterator[] iters = new Iterator[lists.length];
                                      for (int i = 0; i < lists.length; i++) {
                                          //noinspection unchecked
                                          Object listObject = new MVELInterpretedRuntime(lists[i], ctx, tokens).parse();
                                          if (listObject instanceof Object[]) {
                                              listObject = Arrays.asList((Object[]) listObject);
                                          }
                                          iters[i] = ((Collection) listObject).iterator();
                                      }
                                      foreachContext.setIterators(iters);
                                  }
                                  catch (ClassCastException e) {
                                      throw new CompileException("expression for collections does not return a collections object: " + new String(getSegment(currNode)));
                                  }
                                  catch (NullPointerException e) {
                                      throw new CompileException("null returned for foreach in expression: " + (getForEachSegment(currNode)));
                                  }
                              }
  
                              Iterator[] iters = foreachContext.getItererators();
                              String[] alias = currNode.getAlias().split(",");
                              // must trim vars
                              for (int i = 0; i < alias.length; i++) {
                                  alias[i] = alias[i].trim();
                              }
  
                              if (iters[0].hasNext()) {
                                  push();
  
                                  //noinspection unchecked
                                  for (int i = 0; i < iters.length; i++) {
                                      //noinspection unchecked
                                      tokens.put(alias[i], iters[i].next());
                                  }
                                  if (foreachContext.getCount() != 0) {
                                      sbuf.append(foreachContext.getSeperator());
                                  }
                                  //noinspection unchecked
                                  tokens.put("i0", foreachContext.getCount());
                                  foreachContext.setCount(foreachContext.getCount() + 1);
                              }
                              else {
                                  for (int i = 0; i < iters.length; i++) {
                                      tokens.remove(alias[i]);
                                  }
                                  foreachContext.setIterators(null);
                                  foreachContext.setCount(0);
                                  exitContext();
                              }
                              break;
                          }
                          case ELSE:
                          case END:
                              if (stack.isEmpty()) forwardAndPush();
                              continue;
                          case GOTO:
                              pushNode(currNode.getEndNode());
                              continue;
                          case TERMINUS: {
                              if (nodes.length != 2) {
                                  return sbuf.toString();
                              }
                              else {
                                  return register;
                              }
                          }
                          case INCLUDE_BY_REF: {
                              IncludeRef includeRef = (IncludeRef) nodes[node].getRegister();
  
                              IncludeRefParam[] params = includeRef.getParams();
                              Map<String, Object> vars = new HashMap<String, Object>(params.length * 2);
                              for (IncludeRefParam param : params) {
                                  vars.put(param.getIdentifier(), MVEL.eval(param.getValue(), ctx, tokens));
                              }
  
                              if (registry == null) {
                                  throw new CompileException("No TemplateRegistry specified, cannot load template='" + includeRef.getName() + "'");
                              }
                              String template = registry.getTemplate(includeRef.getName());
  
                              if (template == null) {
                                  throw new CompileException("Template does not exist in the TemplateRegistry, cannot load template='" + includeRef.getName() + "'");
                              }
  
                              sbuf.append(TemplateInterpreter.parse(template, ctx, vars, registry));
                          }
                      }
  
                      forwardAndPush();
                  }
                  throw new CompileException("expression did not end properly: expected TERMINUS node");
              }
              catch (CompileException e) {
                  throw e;
              }
              catch (Exception e) {
                  if (currNode != null) {
                      throw new CompileException("problem encountered at node [" + currNode.getNode() + "] "
                              + currNode.getToken() + "{" + currNode.getStartPos() + "," + currNode.getEndPos() + "}: " + e.getMessage(), e);
                  }
                  throw new CompileException("unhandled fatal exception (node:" + node + ")", e);
              }
          }
      }
input: #vulnerable code 
                                  public Object execute(Object ctx, Map tokens, TemplateRegistry registry) {
          if (nodes == null) {
              return new String(expression);
          }
          else if (nodes.length == 2) {
              /**
               * This is an optimization for property expressions.
               */
              switch (nodes[0].getToken()) {
                  case PROPERTY_EX:
                      //noinspection unchecked
                      if (!cacheAggressively) {
                          char[] seg = new char[expression.length - 3];
                          arraycopy(expression, 2, seg, 0, seg.length);
  
                          return MVEL.eval(seg, ctx, tokens);
                      }
                      else {
                          String s = new String(expression, 2, expression.length - 3);
                          if (!EX_PRECOMP_CACHE.containsKey(s)) {
                              synchronized (EX_PRECOMP_CACHE) {
                                  EX_PRECOMP_CACHE.put(s, compileExpression(s));
                                  return executeExpression(EX_PRECOMP_CACHE.get(s), ctx, tokens);
                              }
                          }
                          else {
                              return executeExpression(EX_PRECOMP_CACHE.get(s), ctx, tokens);
                          }
  
                      }
                  case LITERAL:
                      return new String(expression);
  
              }
  
              return new String(expression);
          }
  
          Object register = null;
  
          StringAppender sbuf = new StringAppender(10);
          Node currNode = null;
  
          try {
              //noinspection unchecked
              MVELInterpretedRuntime oParser = new MVELInterpretedRuntime(ctx, tokens);
  
              initStack();
              pushAndForward();
  
              while ((currNode = pop()) != null) {
                  node = currNode.getNode();
  
                  switch (currNode.getToken()) {
                      case LITERAL: {
                          sbuf.append(register = new String(expression, currNode.getStartPos(),
                                  currNode.getEndPos() - currNode.getStartPos()));
                          break;
                      }
                      case PROPERTY_EX: {
                          sbuf.append(
                                  valueOf(register = oParser.setExpressionArray(getInternalSegment(currNode)).parse())
                          );
                          break;
                      }
                      case IF:
                      case ELSEIF: {
                          try {
                              if (!((Boolean) oParser.setExpressionArray(getInternalSegment(currNode)).parse())) {
                                  exitContext();
                              }
                          }
                          catch (ClassCastException e) {
                              throw new CompileException("IF expression does not return a boolean: " + new String(getSegment(currNode)));
                          }
                          break;
                      }
                      case FOREACH: {
                          ForeachContext foreachContext = (ForeachContext) currNode.getRegister();
                          if (foreachContext.getItererators() == null) {
                              try {
                                  String[] lists = getForEachSegment(currNode).split(",");
                                  Iterator[] iters = new Iterator[lists.length];
                                  for (int i = 0; i < lists.length; i++) {
                                      //noinspection unchecked
                                      Object listObject = new MVELInterpretedRuntime(lists[i], ctx, tokens).parse();
                                      if (listObject instanceof Object[]) {
                                          listObject = Arrays.asList((Object[]) listObject);
                                      }
                                      iters[i] = ((Collection) listObject).iterator();
                                  }
                                  foreachContext.setIterators(iters);
                              }
                              catch (ClassCastException e) {
                                  throw new CompileException("expression for collections does not return a collections object: " + new String(getSegment(currNode)));
                              }
                              catch (NullPointerException e) {
                                  throw new CompileException("null returned for foreach in expression: " + (getForEachSegment(currNode)));
                              }
                          }
  
                          Iterator[] iters = foreachContext.getItererators();
                          String[] alias = currNode.getAlias().split(",");
                          // must trim vars
                          for (int i = 0; i < alias.length; i++) {
                              alias[i] = alias[i].trim();
                          }
  
                          if (iters[0].hasNext()) {
                              push();
  
                              //noinspection unchecked
                              for (int i = 0; i < iters.length; i++) {
                                  //noinspection unchecked
                                  tokens.put(alias[i], iters[i].next());
                              }
                              if (foreachContext.getCount() != 0) {
                                  sbuf.append(foreachContext.getSeperator());
                              }
                              //noinspection unchecked
                              tokens.put("i0", foreachContext.getCount());
                              foreachContext.setCount(foreachContext.getCount() + 1);
                          }
                          else {
                              for (int i = 0; i < iters.length; i++) {
                                  tokens.remove(alias[i]);
                              }
                              foreachContext.setIterators(null);
                              foreachContext.setCount(0);
                              exitContext();
                          }
                          break;
                      }
                      case ELSE:
                      case END:
                          if (stack.isEmpty()) forwardAndPush();
                          continue;
                      case GOTO:
                          pushNode(currNode.getEndNode());
                          continue;
                      case TERMINUS: {
                          if (nodes.length != 2) {
                              return sbuf.toString();
                          }
                          else {
                              return register;
                          }
                      }
                      case INCLUDE_BY_REF: {
                          IncludeRef includeRef = (IncludeRef) nodes[node].getRegister();
  
                          IncludeRefParam[] params = includeRef.getParams();
                          Map<String, Object> vars = new HashMap<String, Object>(params.length * 2);
                          for (IncludeRefParam param : params) {
                              vars.put(param.getIdentifier(), MVEL.eval(param.getValue(), ctx, tokens));
                          }
  
                          if (registry == null) {
                              throw new CompileException("No TemplateRegistry specified, cannot load template='" + includeRef.getName() + "'");
                          }
                          String template = registry.getTemplate(includeRef.getName());
  
                          if (template == null) {
                              throw new CompileException("Template does not exist in the TemplateRegistry, cannot load template='" + includeRef.getName() + "'");
                          }
  
                          sbuf.append(TemplateInterpreter.parse(template, ctx, vars, registry));
                      }
                  }
  
                  forwardAndPush();
              }
              throw new CompileException("expression did not end properly: expected TERMINUS node");
          }
          catch (CompileException e) {
              throw e;
          }
          catch (Exception e) {
              if (currNode != null) {
                  throw new CompileException("problem encountered at node [" + currNode.getNode() + "] "
                          + currNode.getToken() + "{" + currNode.getStartPos() + "," + currNode.getEndPos() + "}: " + e.getMessage(), e);
              }
              throw new CompileException("unhandled fatal exception (node:" + node + ")", e);
          }
      } 
                              #location 62 
                              #vulnerability type THREAD_SAFETY_VIOLATION