Java org.springframework.transaction.CannotCreateTransactionException:无法打开事务的Hibernate会话

错误日志：

Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 2.372 sec <<< FAILURE!
testCRUDCategory(net.kzn.shoppingbackend.test.CategoryTestCase)  Time elapsed: 0.124 sec  <<< ERROR!
org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is org.hibernate.exception.GenericJDBCException: Unable to acquire JDBC Connection
    at org.springframework.orm.hibernate5.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:542)
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:373)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:447)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:277)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
    at com.sun.proxy.$Proxy32.add(Unknown Source)

测试班 CategoryTestCase.java

public class CategoryTestCase {

    private static AnnotationConfigApplicationContext context;


    private static CategoryDAO categoryDAO;


    private Category category;


    @BeforeClass
    public static void init() {
        context = new AnnotationConfigApplicationContext();
        context.scan("net.kzn.shoppingbackend");
        context.refresh();
        categoryDAO = (CategoryDAO)context.getBean("categoryDAO");
    }


    @Test
    public void testAddCategory() {

        category = new Category();

        category.setName("Laptop");
        category.setDescription("This is some description for laptop!");
        category.setImageURL("CAT_105.png");

        assertEquals("Successfully added a category inside the table!",true,categoryDAO.add(category));


    }
}

@BeforeClass
public static void init() throws Exception {
    org.h2.tools.Server.createTcpServer().start();
    context = new AnnotationConfigApplicationContext();
    context.scan("net.kzn.shoppingbackend");
    context.refresh();
    productDAO = (ProductDAO)context.getBean("productDAO");
}

为什么我无法为事务打开Hibernate会话；嵌套异常，似乎一切都很好，我为什么会得到这个错误 你也可以检查git-Hub代码同样的问题，请帮助我解决这个问题

---

我克隆了您的项目，发现

连接已断开：“java.net.ConnectException:连接被拒绝：localhost”[90067-194]）

，您似乎没有启动H2服务器。根据您的URL，您正在使用tcp连接，即必须首先启动服务器

我在谷歌上搜索了一下，发现你可以用两种方法来解决这个问题：

您需要一个java主程序来启动服务器，如下所示：

org.h2.tools.Server.createTcpServer（）.start（）
例如：
在测试类->ProductTestCase.java中

public class CategoryTestCase {

    private static AnnotationConfigApplicationContext context;


    private static CategoryDAO categoryDAO;


    private Category category;


    @BeforeClass
    public static void init() {
        context = new AnnotationConfigApplicationContext();
        context.scan("net.kzn.shoppingbackend");
        context.refresh();
        categoryDAO = (CategoryDAO)context.getBean("categoryDAO");
    }


    @Test
    public void testAddCategory() {

        category = new Category();

        category.setName("Laptop");
        category.setDescription("This is some description for laptop!");
        category.setImageURL("CAT_105.png");

        assertEquals("Successfully added a category inside the table!",true,categoryDAO.add(category));


    }
}

@BeforeClass
public static void init() throws Exception {
    org.h2.tools.Server.createTcpServer().start();
    context = new AnnotationConfigApplicationContext();
    context.scan("net.kzn.shoppingbackend");
    context.refresh();
    productDAO = (ProductDAO)context.getBean("productDAO");
}

或者，您可以在尝试连接之前手动启动它，如下所示：
java-cp h2*.jar org.h2.tools.Server
我克隆了您的项目，发现
连接已断开：“java.net.ConnectException:连接被拒绝：localhost”[90067-194]）
，您似乎尚未启动h2服务器。根据您的URL，您正在使用tcp连接，即必须首先启动服务器

我在谷歌上搜索了一下，发现你可以用两种方法来解决这个问题：

您需要一个java主程序来启动服务器，如下所示：
org.h2.tools.Server.createTcpServer（）.start（）
例如：
在测试类->ProductTestCase.java中

public class CategoryTestCase {

    private static AnnotationConfigApplicationContext context;


    private static CategoryDAO categoryDAO;


    private Category category;


    @BeforeClass
    public static void init() {
        context = new AnnotationConfigApplicationContext();
        context.scan("net.kzn.shoppingbackend");
        context.refresh();
        categoryDAO = (CategoryDAO)context.getBean("categoryDAO");
    }


    @Test
    public void testAddCategory() {

        category = new Category();

        category.setName("Laptop");
        category.setDescription("This is some description for laptop!");
        category.setImageURL("CAT_105.png");

        assertEquals("Successfully added a category inside the table!",true,categoryDAO.add(category));


    }
}

@BeforeClass
public static void init() throws Exception {
    org.h2.tools.Server.createTcpServer().start();
    context = new AnnotationConfigApplicationContext();
    context.scan("net.kzn.shoppingbackend");
    context.refresh();
    productDAO = (ProductDAO)context.getBean("productDAO");
}

或者，您可以在尝试连接之前手动启动它，如下所示：
java-cp h2*.jar org.h2.tools.Server
确保数据库URL和其他参数正确无误。未建立到数据库的连接。请检查它：可能与数据库的连接重复。请确保数据库URL以及其他参数正确无误。未建立与数据库的连接。请检查：可能存在重复的