我得到的错误
struct Student {
let name: String
let age: Int
}
var student = Student(name: "David", age: 17)
/* ^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^-initializer call for the type
\ type 'Student' */
print(type(of: student)) // Student
print(student.name) // David
print(student.age) // 17
我的代码在这里
log4j:WARN No appenders could be found for logger (org.jboss.logging).
log4j:WARN Please initialize the log4j system properly.
Initial SessionFactory creation failed.java.lang.NoSuchFieldError: TRACE
Exception in thread "main" java.lang.ExceptionInInitializerError
at hibernate.example.HibernateUtil.<clinit>(HibernateUtil.java:28)
at hibernate.example.storeProduct.AddProduct(storeProduct.java:20)
at hibernate.example.storeProduct.main(storeProduct.java:13)
Caused by: java.lang.NoSuchFieldError: TRACE
at org.jboss.logging.Log4jLogger.translate(Log4jLogger.java:64)
at org.jboss.logging.Log4jLogger.doLog(Log4jLogger.java:44)
at org.jboss.logging.Logger.trace(Logger.java:107)
at org.hibernate.boot.registry.selector.internal.StrategySelectorImpl.registerStrategyImplementor(StrategySelectorImpl.java:53)
at org.hibernate.boot.registry.selector.internal.StrategySelectorBuilder.addDialect(StrategySelectorBuilder.java:237)
at org.hibernate.boot.registry.selector.internal.StrategySelectorBuilder.addDialects(StrategySelectorBuilder.java:188)
at org.hibernate.boot.registry.selector.internal.StrategySelectorBuilder.buildSelector(StrategySelectorBuilder.java:154)
at org.hibernate.boot.registry.BootstrapServiceRegistryBuilder.build(BootstrapServiceRegistryBuilder.java:222)
at org.hibernate.cfg.Configuration.<init>(Configuration.java:119)
at org.hibernate.cfg.AnnotationConfiguration.<init>(AnnotationConfiguration.java:87)
at hibernate.example.HibernateUtil.<clinit>(HibernateUtil.java:24)
... 2 more
Product.java类
package hibernate.example;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
public class storeProduct {
public static void main(String[] args)
{
AddProduct("Pents", "GUCCI BRAND", 500, 30, "PATA NAI");
}
public static void AddProduct(String pName, String pDes, double price, int items, String Brand) // Access by Admin
{
SessionFactory factory=HibernateUtil.getSessionFactory();
Session session=factory.openSession();
//creating transaction object
Transaction t = session.beginTransaction();
product p = new product();
p.setpName(pName);
p.setpDescription(pDes);
p.setPrice(price);
p.setItemsAvailable(items);
p.setBrand(Brand);
session.persist(p);
t.commit();//transaction is committed
if ( session.isOpen() ) session.close();
System.out.println("Product successfully Inserted to db");
}
HibernateUtil.java CLASS
package hibernate.example;
public class product {
private int pId;
private String pName;
private String pDescription;
private double price;
private int itemsAvailable;
private String Brand;
public product() {
// TODO Auto-generated constructor stub
}
public String getBrand() {
return Brand;
}
public void setBrand(String brand) {
Brand = brand;
}
public int getItemsAvailable() {
return itemsAvailable;
}
public void setItemsAvailable(int itemsAvailable) {
this.itemsAvailable = itemsAvailable;
}
public int getpId() {
return pId;
}
public void setpId(int pId) {
this.pId = pId;
}
public String getpName() {
return pName;
}
public void setpName(String pName) {
this.pName = pName;
}
public String getpDescription() {
return pDescription;
}
public void setpDescription(String pDescription) {
this.pDescription = pDescription;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
}
product.hbm.xml文件
package hibernate.example;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.SessionFactory;
/**
* Hibernate Utility class with a convenient method to get Session Factory object.
*
* @author Ali Hassan
*/
public class HibernateUtil {
private static final SessionFactory sessionFactory;
static {
try {
// Create the SessionFactory from standard (hibernate.cfg.xml)
// config file.
sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
} catch (Throwable ex) {
// Log the exception.
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
Hibernate.cfg.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
<hibernate-mapping>
<class name="hibernate.example.product" table="product">
<id name="pId"
column="pId"
unsaved-value="0"
>
<generator class="native"></generator>
</id>
<property name="pName"></property>
<property name="Brand"></property>
<property name="price"></property>
<property name="itemsAvailable"></property>
<property name="pDescription"></property>
</class>
</hibernate-mapping>
我厌倦了这个错误。从2天起获得相同的错误。甚至没有一个解决方案可行。我正在使用ECLIPSE NEON。包括所有的罐子enter image description here。我在网络项目中使用了休眠模式。相同的文件在具有相同jar的其他项目中运行。
答案 0 :(得分：0)
尝试使用log4J 1.2.12或更高版本。
您可以在类路径中检查类org.apache.log4j.Level的冲突版本并尝试解决它。 TRACE级别在版本1.2.12或更高版本的log4j jar中可用，但您使用的是1.2.11，因此存在问题。
答案 1 :(得分：0)
用以下代码替换HibernateUtil文件： -
#include <type_traits>
template< typename U, typename ... Ts > struct belong_to
{
// before C++17 value will have to be defined recursively on the head of Ts
static constexpr bool value = (std::is_same< U, Ts >::value || ... );
using type = typename std::enable_if< value, U > ::type;
};
// usage example:
template< typename T >
using testable = typename belong_to< T, int, float, const char >::type;
template< typename T > void test ( testable< T > i )
{
// test process
}
int main()
{
test< int > ( 3 );
test< float > ( 3.0 );
test< const char > ('c');
// test< signed char >( 1 ); does not compile!!!
}
com.mkyong.persistence;
import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration;
public class HibernateUtil {
package}