output: #fixed code
                                  @Override
      public Type getType() {
          if (wrappedNode instanceof Parameter) {
              Parameter parameter = (Parameter) wrappedNode;
              if (getParentNode(wrappedNode) instanceof LambdaExpr) {
                  int pos = getParamPos(parameter);
                  Type lambdaType = JavaParserFacade.get(typeSolver).getType(getParentNode(wrappedNode));
  
                  // TODO understand from the context to which method this corresponds
                  //MethodDeclaration methodDeclaration = JavaParserFacade.get(typeSolver).getMethodCalled
                  //MethodDeclaration methodCalled = JavaParserFacade.get(typeSolver).solve()
                  throw new UnsupportedOperationException(wrappedNode.getClass().getCanonicalName());
              } else {
                  Type rawType = null;
                  if (parameter.getType() instanceof com.github.javaparser.ast.type.PrimitiveType) {
                      rawType = PrimitiveType.byName(((com.github.javaparser.ast.type.PrimitiveType) parameter.getType()).getType().name());
                  } else {
                      rawType = JavaParserFacade.get(typeSolver).convertToUsage(parameter.getType(), wrappedNode);
                  }
                  if (parameter.isVarArgs()) {
                      return new ArrayType(rawType);
                  } else {
                      return rawType;
                  }
              }
          } else if (wrappedNode instanceof VariableDeclarator) {
              VariableDeclarator variableDeclarator = (VariableDeclarator) wrappedNode;
              if (getParentNode(wrappedNode) instanceof VariableDeclarationExpr) {
                  VariableDeclarationExpr variableDeclarationExpr = (VariableDeclarationExpr) getParentNode(variableDeclarator);
                  return JavaParserFacade.get(typeSolver).convert(variableDeclarationExpr.getElementType(), JavaParserFactory.getContext(wrappedNode, typeSolver));
              } else if (getParentNode(wrappedNode) instanceof FieldDeclaration) {
                  FieldDeclaration fieldDeclaration = (FieldDeclaration) getParentNode(variableDeclarator);
                  return JavaParserFacade.get(typeSolver).convert(fieldDeclaration.getElementType(), JavaParserFactory.getContext(wrappedNode, typeSolver));
              } else {
                  throw new UnsupportedOperationException(getParentNode(wrappedNode).getClass().getCanonicalName());
              }
          } else {
              throw new UnsupportedOperationException(wrappedNode.getClass().getCanonicalName());
          }
      }
input: #vulnerable code 
                                  @Override
      public Type getType() {
          if (wrappedNode instanceof Parameter) {
              Parameter parameter = (Parameter) wrappedNode;
              if (wrappedNode.getParentNode() instanceof LambdaExpr) {
                  int pos = getParamPos(parameter);
                  Type lambdaType = JavaParserFacade.get(typeSolver).getType(wrappedNode.getParentNode());
  
                  // TODO understand from the context to which method this corresponds
                  //MethodDeclaration methodDeclaration = JavaParserFacade.get(typeSolver).getMethodCalled
                  //MethodDeclaration methodCalled = JavaParserFacade.get(typeSolver).solve()
                  throw new UnsupportedOperationException(wrappedNode.getClass().getCanonicalName());
              } else {
                  Type rawType = null;
                  if (parameter.getType() instanceof com.github.javaparser.ast.type.PrimitiveType) {
                      rawType = PrimitiveType.byName(((com.github.javaparser.ast.type.PrimitiveType) parameter.getType()).getType().name());
                  } else {
                      rawType = JavaParserFacade.get(typeSolver).convertToUsage(parameter.getType(), wrappedNode);
                  }
                  if (parameter.isVarArgs()) {
                      return new ArrayType(rawType);
                  } else {
                      return rawType;
                  }
              }
          } else if (wrappedNode instanceof VariableDeclarator) {
              VariableDeclarator variableDeclarator = (VariableDeclarator) wrappedNode;
              if (wrappedNode.getParentNode() instanceof VariableDeclarationExpr) {
                  VariableDeclarationExpr variableDeclarationExpr = (VariableDeclarationExpr) variableDeclarator.getParentNode();
                  return JavaParserFacade.get(typeSolver).convert(variableDeclarationExpr.getElementType(), JavaParserFactory.getContext(wrappedNode, typeSolver));
              } else if (wrappedNode.getParentNode() instanceof FieldDeclaration) {
                  FieldDeclaration fieldDeclaration = (FieldDeclaration) variableDeclarator.getParentNode();
                  return JavaParserFacade.get(typeSolver).convert(fieldDeclaration.getElementType(), JavaParserFactory.getContext(wrappedNode, typeSolver));
              } else {
                  throw new UnsupportedOperationException(wrappedNode.getParentNode().getClass().getCanonicalName());
              }
          } else {
              throw new UnsupportedOperationException(wrappedNode.getClass().getCanonicalName());
          }
      } 
                              #location 30 
                              #vulnerability type NULL_DEREFERENCE