Merge pull request eugenp#6129 from chandra1123/BAEL-2088-HibernateExceptions

Bael 2088 hibernate exceptions

Author: lor6

persistence-modules/hibernate5/src/main/java/com/baeldung/hibernate/exception/EntityWithNoId.java

@@ -0,0 +1,16 @@
+package com.baeldung.hibernate.exception;
+
+import javax.persistence.Entity;
+
+@Entity
+public class EntityWithNoId {
+    private int id;
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+}

persistence-modules/hibernate5/src/main/java/com/baeldung/hibernate/exception/HibernateUtil.java

@@ -0,0 +1,63 @@
+package com.baeldung.hibernate.exception;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.net.URL;
+import java.util.Properties;
+
+import org.apache.commons.lang3.StringUtils;
+import org.hibernate.SessionFactory;
+import org.hibernate.boot.Metadata;
+import org.hibernate.boot.MetadataSources;
+import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
+import org.hibernate.service.ServiceRegistry;
+
+public class HibernateUtil {
+    private static SessionFactory sessionFactory;
+    private static String PROPERTY_FILE_NAME;
+
+    public static SessionFactory getSessionFactory() throws IOException {
+        return getSessionFactory(null);
+    }
+
+    public static SessionFactory getSessionFactory(String propertyFileName)
+        throws IOException {
+        PROPERTY_FILE_NAME = propertyFileName;
+        if (sessionFactory == null) {
+            ServiceRegistry serviceRegistry = configureServiceRegistry();
+            sessionFactory = makeSessionFactory(serviceRegistry);
+        }
+        return sessionFactory;
+    }
+
+    private static SessionFactory makeSessionFactory(
+        ServiceRegistry serviceRegistry) {
+        MetadataSources metadataSources = new MetadataSources(serviceRegistry);
+        metadataSources.addAnnotatedClass(Product.class);
+        Metadata metadata = metadataSources.getMetadataBuilder()
+            .build();
+        return metadata.getSessionFactoryBuilder()
+            .build();
+
+    }
+
+    private static ServiceRegistry configureServiceRegistry()
+        throws IOException {
+        Properties properties = getProperties();
+        return new StandardServiceRegistryBuilder().applySettings(properties)
+            .build();
+    }
+
+    private static Properties getProperties() throws IOException {
+        Properties properties = new Properties();
+        URL propertiesURL = Thread.currentThread()
+            .getContextClassLoader()
+            .getResource(StringUtils.defaultString(PROPERTY_FILE_NAME,
+                "hibernate-exception.properties"));
+        try (FileInputStream inputStream = new FileInputStream(
+            propertiesURL.getFile())) {
+            properties.load(inputStream);
+        }
+        return properties;
+    }
+}

persistence-modules/hibernate5/src/main/java/com/baeldung/hibernate/exception/Product.java

@@ -0,0 +1,40 @@
+package com.baeldung.hibernate.exception;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+
+@Entity
+public class Product {
+
+    private int id;
+    
+    private String name;
+    private String description;
+
+    @Id
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+    
+    @Column(nullable=false)
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+}