我再次来到了百里叶沼泽。
我收到了
There was an unexpected error (type=Internal Server Error, status=500). No primary or default constructor found for interface java.util.List
当我点击 addRow 按钮“+”时。
主页模板:
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<link rel="stylesheet" type="text/css" media="all"
href="../static/css/home-style.css"
th:href="@{/css/home-style.css}"/>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<!--------------------------------------------------------------------------->
<h1 id="page-title"/>
<h3 id="recipe-id"/>
<h3 id="recipe-name"/>
<!--------------------------------------------------------------------------->
<form id="get-recalculated-recipe" action="#" method="post">
<table>
<tr>
<th th:text="#{table.label.quantity}">Quantity</th>
<th>Unit</th>
<th>Ingredient Name</th>
<th>Multiplier</th>
</tr>
<!---------------------------------------------------------------------------->
<div>
<h2 th:text="#{text.new.recipe}">Add new Recipe</h2>
<!-- @{/home} replace via home th xml-->
<!-- Replace ${recipe} via home th xml-->
<form action="#" th:action="@{/home}" th:object="${recipe}" method="post">
<legend th:text="${recipename}">Legend text</legend>
<div>
<!-- message text-->
<label th:text="#{text.ingredients}">Ingredients</label>
<table>
<!--------------------------------------------------------------------------------------------->
<thead>
<tr>
<th th:text="#{text.ingredient.quantity}">Qty</th>
<th th:text="#{text.ingredient.unit}">Unit</th>
<th th:text="#{text.ingredient.name}">Name</th>
<th>
<button type="submit" name="addRow" th:text="#{text.submit.addrow}">Add row</button>
</th>
</tr>
</thead>
<!--------------------------------------------------------------------------------------------->
<tbody>
<!--- Property or field 'ingredients' cannot be found on object of type 'com.potatospy.reciply.web.model.response.Recipe' - maybe not public or not valid? --->
<tr th:each="ingredient : *{ingredientList}">
<!-- <td th:text="${rowStat.count}">1</td>-->
<td>
<input type="text" th:field="*{ingredientName}"
th:errorclass="fieldError"/>
</td>
<!--------------------------------------------------------------------------------------------->
<td>
<input type="text" th:field="*{quantity}"
th:errorclass="fieldError"/>
</td>
<!--------------------------------------------------------------------------------------------->
<td>
<select th:field="*{unit}">
<option th:each="units : ${allUnits}" th:value="${units.id}" th:text="${var.name}">
Thymus Thymi
</option>
</select>
</td>
<!--------------------------------------------------------------------------------------------->
<td>
<button type="submit" name="removeRow" th:value="${rowStat.index}"
th:text="#{text.submit.removerow}">Remove row
</button>
</td>
<!--------------------------------------------------------------------------------------------->
</tr>
</tbody>
</table>
</div>
<!--------------------------------------------------------------------------------------------->
<div class="submit">
<button type="submit" name="save" th:text="#{text.submit.newrecipe}">Add New Recipe</button>
</div>
</form>
</div>
</table>
</form>
</body>
</html>
Controller :
package com.potatospy.reciply.web.controller;
import com.potatospy.reciply.business.service.RecipeService;
import com.potatospy.reciply.business.util.AttributeNames;
import com.potatospy.reciply.business.util.ViewNames;
import com.potatospy.reciply.web.model.response.Unit;
import com.potatospy.reciply.web.model.response.Ingredient;
import com.potatospy.reciply.web.model.response.Recipe;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import com.potatospy.reciply.business.util.Mappings;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
@Controller
@Slf4j
@RequestMapping("/")
public class ReciplyController {
@Autowired
RecipeService svc;
// == Model attributes == todo
@ModelAttribute
public List<Recipe> recipeData(){ return svc.getAllRecipes(); } // Todo For populating a menu of recipes
// Menu Text for recipe row Unit selection
@ModelAttribute("allUnits")
public List<Unit> unitList() {
return Arrays.asList(Unit.ALL);
}
// == FIRST STOP ==
/* This view doesn't require any attributes or params passed to it. It's for first visits only. */
@GetMapping(Mappings.HOME)
public String getHomeView(Model model) { // Took out params and attribs since they dont exist in the model
// until the controller creates them
log.info("Inside getMainView");
Recipe recipe = svc.initNewRecipe(); // Create and initialize a new recipe
//////////////////////////////////////////////////////////////////////////////////////////////////
model.addAttribute(AttributeNames.RECIPE, recipe);
model.addAttribute(AttributeNames.RECIPE_ID, recipe.getRecipeId()); // should I put 0 here or what LOL
model.addAttribute(AttributeNames.RECIPE_NAME, recipe.getRecipeName()); // "" ?
model.addAttribute(AttributeNames.RECIPE_DATA, recipeData());
model.addAttribute("ingredients", recipe.getIngredientList());
log.info("recipe ingredient list size: {}", recipe.getIngredientList().size());
//model.addAttribute(AttributeNames.INGREDIENT_LIST, recipe.getIngredientList());
return ViewNames.HOME;
}
// == ADD ROW ==
// Add Row, creates and initializes a new Recipe, adds it to the DB and List
// and adds the attribute.
@RequestMapping(value=Mappings.ADD_ROW)
public String addRow(Model model
/*final Recipe recipe, */
/*final BindingResult bindingResult*//*holds the result of the validation and binding and contains errors that may have occurred*/) {
svc.initNewRecipe();
model.addAttribute(AttributeNames.RECIPE_DATA, recipeData());
return ViewNames.HOME;
}
/*@RequestMapping(value="/seedstartermng", params={"addRow"})
public String addRow(final SeedStarter seedStarter, final BindingResult bindingResult) {
seedStarter.getRows().add(new Row());
return "seedstartermng";
}*/
@GetMapping("homelink")
public String getHomeViewShortcut(Model model){
log.info("Inside getHomeViewShortcut");
Recipe recipe1 = new Recipe();
recipe1.setIngredientList(new ArrayList<>());
model.addAttribute("RECIPE",recipe1);
return ViewNames.HOME;
}
// == AFTER SUBMIT ==
@PostMapping(Mappings.SUBMIT)
public String submit(Model model/*, @ModelAttribute(AttributeNames.RECIPE*/){
//model.addAttribute(AttributeNames.RECIPE, recipe);
model.addAttribute(AttributeNames.RECIPE_ID, 0); // should i put 0 here or what LOL
model.addAttribute(AttributeNames.RECIPE_NAME, ""); // "" ?
model.addAttribute(AttributeNames.RECIPE_DATA, recipeData());
return "";
}
// == AFTER SUBMIT ==
@PostMapping(Mappings.HOME)
public String getRecipe(
@ModelAttribute(AttributeNames.RECIPE) Recipe recipe,
@ModelAttribute(AttributeNames.INGREDIENT_LIST) List<Ingredient> ingredientList){
return "";
}
}
服务:
package com.potatospy.reciply.business.service;
import com.potatospy.reciply.business.dao.entity.RecipeEntity;
import com.potatospy.reciply.business.dao.repository.RecipeRepository;
import com.potatospy.reciply.business.util.IDManager;
import com.potatospy.reciply.web.model.response.Unit;
import com.potatospy.reciply.web.model.response.Ingredient;
import com.potatospy.reciply.web.model.response.Recipe;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import java.util.ArrayList;
import java.util.List;
@Slf4j
@Service
public class RecipeServiceImpl implements RecipeService{
@Value("${id.length}")
private int idLength;
@Autowired
private RecipeRepository recipeRepository;
@Autowired
IDManager idManager;
List<Recipe> inMemRecipeList = new ArrayList<>(); // In-memory list of recipes
// Get all Recipes from DB, load into list of Recipes, return list
@Override
public List<Recipe> getAllRecipes() {
// "Clear" the list
inMemRecipeList = new ArrayList<>();
// Retrieve recipes from DB and add to In-memory list
for(RecipeEntity recipeDbEntity : recipeRepository.findAll()){
Recipe recipe = new Recipe();
BeanUtils.copyProperties(recipeDbEntity, recipe);
inMemRecipeList.add(recipe);
}
log.info("Returning list from getAllRecipes : {}", inMemRecipeList);
return inMemRecipeList;
}
// Save a recipe and log
@Override
public RecipeEntity addRecipeToDb(RecipeEntity recipeToSave) {
log.info("Saved recipe with ID: " + recipeToSave.getRecipeId());
return recipeRepository.save(recipeToSave);
}
// == Create new blank Recipe, save to DB and memory and return ==
public Recipe initNewRecipe(){
// Create a new recipe
Recipe newRecipe = new Recipe();
newRecipe.setRecipeId(generateId());
newRecipe.setRecipeName("Hamblargers");
// Add a blank ingredient FOR TESTING to the Recipe
Ingredient blankIngredient = new Ingredient(
0L,
0.0,
Unit.CUPS,
""
);
newRecipe.getIngredientList().add(blankIngredient);
// Save it to DB and return the result
RecipeEntity newRecipeEntity = new RecipeEntity();
BeanUtils.copyProperties(newRecipe, newRecipeEntity);
Recipe returnableRecipe = new Recipe();
BeanUtils.copyProperties(addRecipeToDb(newRecipeEntity), returnableRecipe);
getAllRecipes(); // Update memory TODO This should be all automatic!
log.info("New recipe created with id {}", returnableRecipe.getRecipeId());
return returnableRecipe;
}
// Delete a recipe and log
@Override
public void delete(Recipe recipeToDelete) {
RecipeEntity recipeEntityToDelete = new RecipeEntity();
log.info("Deleting recipe with ID: {} There is no undo at this time.",
recipeToDelete.getRecipeId());
recipeRepository.delete(recipeEntityToDelete);
}
@Override
public Long generateId() {
log.info("Service Generating Generic ID with length {}", idLength);
return (idManager.generateId(idLength)); // Return string via service
}
}
最佳答案
我的 Recipe 对象 Ingredient ArrayList 的大小为 0!
我在服务中的初始化似乎不起作用。
关于java - 提交表单时收到接口(interface) java.util.List 未找到主要或默认构造函数？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/57452965/