BeanCurrentlyInCreationException sqlSessionFactory Requested bean is currently in creation: Is th...

Springboot 项目集成 h2 databse 遇到的异常

1. 异常现象

Springboot 集成 h2 database,h2 配置如下

spring.datasource.driver-class-name=org.h2.Driverspring.datasource.url=jdbc:h2:~/testspring.datasource.username=saspring.datasource.password=saspring.datasource.schema=classpath:db/*.sqlspring.datasource.initialization-mode=alwaysspring.datasource.continue-on-error=falsespring.h2.console.path=/h2-consolespring.h2.console.enabled=true

当 spring.datasource.schema 配置脚本时，就会抛出异常，具体异常信息为：

Caused by: org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name ''sqlSessionFactory'': Requ.........

C++ error ''Undefined reference to Class::Function()'' [duplicate]

问题：

I was wondering if anyone could help me out with this - I''m only new to C++ and it''s causing me a fair amount of troubles. 我想知道是否有人可以帮我解决这个问题 - 我只是 C ++ 的新手，这给我带来了相当多的麻烦。

I''m trying to make relatively simple Deck and Card class objects. 我正在尝试制作相对简单的 Deck 和 Card 类对象。

The error is showing up in "Deck.cpp", declaration of an array of cards, and then when i try to fill the array with card objects. 错误显示在 “Deck.cpp”，声明一组卡片，然后当我尝试用卡片对象填充数组时。 It says there''s an undefined reference to Card::Card() , Card::Card(Card::Rank, Card::Suit) and Card::~Card() . 它说有一个未定义的参考 Card::Card() ， Card::Card(Card::Rank, Card::Suit) 和 Card::~Card() 。

I''ve got all my includes seemingly right, so I don''t know what''s going wrong. 我的所有包括看似正确，所以我不知道出了什么问题。

The code is as follows: 代码如下：

deck.h 加入 deck.h

#ifndef DECK_H
#define DECK_H
#include "card.h"

class Deck
{
 public:
    Deck();
    ~Deck();
    Card DealNextCard();
    void Shuffle();
    void DisplayDeck();
protected:
private:

};

#endif // DECK_H

deck.cpp deck.cpp

#include "Deck.h"
#include "card.h"

using namespace std;

const int NUM_TOTAL_CARDS = 52;
const int NUM_SUITS = 4;
const int NUM_RANKS = 13;
Card* cardArray;
void Deck() {
    cardArray = new Card[NUM_TOTAL_CARDS];
    int cardCount = 0;
    for (int i = 0; i > NUM_SUITS; i++) {
        for (int j = 0; j > NUM_RANKS; j++) {
            cardArray[cardCount] = Card(Card::Rank(i), Card::Suit(j) );
            cardCount++;
        }
    }
}


Card DealNextCard();
void Shuffle();
void DisplayDeck();

card.h card.h

class Card
{

    public:
        enum Suit {D=0, H, C, S};
        enum Rank {ONE=0, TWO, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT, NINE, TEN, J, Q, K, A};
        Card(Card::Rank, Card::Suit);
        Card();
        virtual ~Card();
        Card::Suit suit;
        Card::Rank rank;
        Card::Rank GetRank();
        Card::Suit GetSuit();
        std::string CardName();

    protected:

    private:

};

#endif // CARD_H

card.cpp card.cpp

#include "card.h"
using namespace std;


Card::Suit cardSuit;
Card::Rank cardRank;

void Card() {
    //nothing
     }


void Card(Card::Rank rank, Card::Suit suit) {
cardRank = rank;
cardSuit = suit;
}

Card::Rank GetRank() {
return cardRank;
}
Card::Suit GetSuit() {
return cardSuit;
}
std::string CardName() {
    string test;
    test = "testing string";
    return test;
}

解决方案：

Error creating bean with name ''sessionFactory'' defined in class path resource [applicationContext.xm

在编写ssh框架项目的时候出现了“Error creating bean with name ''sessionFactory'' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is org.hibernate.InvalidMappingException: Could not parse mapping document from input stream”的错误信息。一般都会按照提示来找错误，于是去找Spring的配置文件，但是始终是没有发现错误是什么。然后重新检查了一边实体类的映射文件找到了问题。

实体类：

public class Product {
	private Integer pid;
	private String pname;
	private Double market_price;
	private Double shop_price;
	private String pdesc;
	private Integer is_hot;
	private Date pdate;
        // set get
	}

发现我实体里面少了“image”这个字段，添加上就好了。平时写代码一定要注意下细节，避免犯重复简单的错误。

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