Remove reflection usage in orm.hibernate4.*

Previously reflection was required when interacting with Hibernate 4 in
order to support both Hibernate 3 and Hibernate 4 since there were
non-passive changes in the APIs. Now that the Spring build uses Gradle
it is trivial to support multiple Hibernate versions.

This commit removes the reflection usage in orm.hibernate4.* by
creating a spring-orm-hibernate4 module that uses
gradle/merge-artifacts.gradle to build a single artifact but keep
distinct classpaths.

Issue: SPR-10039

build.gradle

@@ -431,10 +431,9 @@ project('spring-orm') {
         // our respective orm.hibernate3 and orm.hibernate4 packages
         compile("aopalliance:aopalliance:1.0")
         compile("org.hibernate:com.springsource.org.hibernate:3.3.1.GA", optional)
-        compile("org.hibernate:hibernate-core:4.1.0.Final", optional)
         compile("org.hibernate:hibernate-cglib-repack:2.1_3", optional)
         compile("org.hibernate:hibernate-annotations:3.4.0.GA", optional)
-        compile("org.hibernate:hibernate-entitymanager:4.1.0.Final", optional)
+        compile("org.hibernate:hibernate-entitymanager:3.4.0.GA", optional)
         compile("org.apache.openjpa:openjpa:1.1.0", optional)
         compile("org.eclipse.persistence:org.eclipse.persistence.core:1.0.1", optional)
         compile("org.eclipse.persistence:org.eclipse.persistence.jpa:1.0.1", optional)
@@ -459,6 +458,24 @@ project('spring-orm') {
     }
 }
 
+project('spring-orm-hibernate4') {
+    description = 'Spring Object/Relational Mapping - Hibernate 4 support'
+    ext.mergeIntoProject = project(':spring-orm')
+    apply from: "${gradleScriptDir}/merge-artifacts.gradle"
+    dependencies {
+        compile project(":spring-orm").sourceSets.main.output
+        compile project(":spring-tx")
+        compile project(":spring-jdbc")
+        compile("org.hibernate:hibernate-core:4.1.0.Final", optional)
+        compile("org.hibernate:hibernate-entitymanager:4.1.0.Final", optional)
+        compile(project(":spring-web")) { dep ->
+            optional dep
+            exclude group: 'javax.persistence', module: 'persistence-api'
+        }
+        compile("javax.servlet:servlet-api:2.5", optional)
+    }
+}
+
 project('spring-webmvc') {
     description = 'Spring Web MVC'
     dependencies {

settings.gradle

@@ -12,6 +12,7 @@ include 'spring-instrument-tomcat'
 include 'spring-jdbc'
 include 'spring-jms'
 include 'spring-orm'
+include 'spring-orm-hibernate4'
 include 'spring-oxm'
 include 'spring-struts'
 include 'spring-test'

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/HibernateExceptionTranslator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/HibernateJdbcException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/HibernateObjectRetrievalFailureException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/HibernateOptimisticLockingFailureException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/HibernateQueryException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/HibernateSystemException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/HibernateTransactionManager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,7 +16,6 @@
 
 package org.springframework.orm.hibernate4;
 
-import java.lang.reflect.Method;
 import java.sql.Connection;
 import javax.sql.DataSource;
 
@@ -45,8 +44,6 @@ import org.springframework.transaction.support.AbstractPlatformTransactionManage
 import org.springframework.transaction.support.DefaultTransactionStatus;
 import org.springframework.transaction.support.ResourceTransactionManager;
 import org.springframework.transaction.support.TransactionSynchronizationManager;
-import org.springframework.util.ClassUtils;
-import org.springframework.util.ReflectionUtils;
 
 /**
  * {@link org.springframework.transaction.PlatformTransactionManager}
@@ -105,15 +102,6 @@ import org.springframework.util.ReflectionUtils;
 public class HibernateTransactionManager extends AbstractPlatformTransactionManager
 		implements ResourceTransactionManager, InitializingBean {
 
-	/**
-	 * A Method handle for the <code>SessionFactory.getCurrentSession()</code> method.
-	 * The return value differs between Hibernate 3.x and 4.x; for cross-compilation purposes,
-	 * we have to use reflection here as long as we keep compiling against Hibernate 3.x jars.
-	 */
-	private static final Method getCurrentSessionMethod =
-			ClassUtils.getMethod(SessionFactory.class, "getCurrentSession");
-
-
 	private SessionFactory sessionFactory;
 
 	private DataSource dataSource;
@@ -293,7 +281,7 @@ public class HibernateTransactionManager extends AbstractPlatformTransactionMana
 		}
 		else if (this.hibernateManagedSession) {
 			try {
-				Session session = (Session) ReflectionUtils.invokeMethod(getCurrentSessionMethod, this.sessionFactory);
+				Session session = this.sessionFactory.getCurrentSession();
 				if (logger.isDebugEnabled()) {
 					logger.debug("Found Hibernate-managed Session [" + session + "] for Spring-managed transaction");
 				}
@@ -337,7 +325,7 @@ public class HibernateTransactionManager extends AbstractPlatformTransactionMana
 
 		try {
 			if (txObject.getSessionHolder() == null || txObject.getSessionHolder().isSynchronizedWithTransaction()) {
-				Session newSession = SessionFactoryUtils.openSession(getSessionFactory());
+				Session newSession = getSessionFactory().openSession();
 				if (logger.isDebugEnabled()) {
 					logger.debug("Opened new Session [" + newSession + "] for Hibernate transaction");
 				}

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/LocalSessionFactoryBuilder.java

@@ -17,7 +17,6 @@
 package org.springframework.orm.hibernate4;
 
 import java.io.IOException;
-import java.lang.reflect.Method;
 import javax.persistence.Embeddable;
 import javax.persistence.Entity;
 import javax.persistence.MappedSuperclass;
@@ -46,7 +45,6 @@ import org.springframework.core.type.filter.TypeFilter;
 import org.springframework.transaction.jta.JtaTransactionManager;
 import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
-import org.springframework.util.ReflectionUtils;
 
 /**
  * A Spring-provided extension of the standard Hibernate {@link Configuration} class,
@@ -75,13 +73,6 @@ public class LocalSessionFactoryBuilder extends Configuration {
 			new AnnotationTypeFilter(Embeddable.class, false),
 			new AnnotationTypeFilter(MappedSuperclass.class, false)};
 
-	private static final Method addAnnotatedClassMethod =
-			ClassUtils.getMethod(Configuration.class, "addAnnotatedClass", Class.class);
-
-	private static final Method addPackageMethod =
-			ClassUtils.getMethod(Configuration.class, "addPackage", String.class);
-
-
 	private final ResourcePatternResolver resourcePatternResolver;
 
 
@@ -169,7 +160,7 @@ public class LocalSessionFactoryBuilder extends Configuration {
 	 */
 	public LocalSessionFactoryBuilder addAnnotatedClasses(Class<?>... annotatedClasses) {
 		for (Class<?> annotatedClass : annotatedClasses) {
-			ReflectionUtils.invokeMethod(addAnnotatedClassMethod, this, annotatedClass);
+			addAnnotatedClass(annotatedClass);
 		}
 		return this;
 	}
@@ -181,7 +172,7 @@ public class LocalSessionFactoryBuilder extends Configuration {
 	 */
 	public LocalSessionFactoryBuilder addPackages(String... annotatedPackages) {
 		for (String annotatedPackage :annotatedPackages) {
-			ReflectionUtils.invokeMethod(addPackageMethod, this, annotatedPackage);
+			addPackage(annotatedPackage);
 		}
 		return this;
 	}

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/SessionFactoryUtils.java

@@ -16,7 +16,6 @@
 
 package org.springframework.orm.hibernate4;
 
-import java.lang.reflect.Method;
 import javax.sql.DataSource;
 
 import org.apache.commons.logging.Log;
@@ -53,8 +52,6 @@ import org.springframework.dao.IncorrectResultSizeDataAccessException;
 import org.springframework.dao.InvalidDataAccessApiUsageException;
 import org.springframework.dao.InvalidDataAccessResourceUsageException;
 import org.springframework.jdbc.datasource.DataSourceUtils;
-import org.springframework.util.ClassUtils;
-import org.springframework.util.ReflectionUtils;
 
 /**
  * Helper class featuring methods for Hibernate Session handling.
@@ -79,13 +76,6 @@ public abstract class SessionFactoryUtils {
 	public static final int SESSION_SYNCHRONIZATION_ORDER =
 			DataSourceUtils.CONNECTION_SYNCHRONIZATION_ORDER - 100;
 
-	/**
-	 * A Method handle for the <code>SessionFactory.openSession()</code> method.
-	 * The return value differs between Hibernate 3.x and 4.x; for cross-compilation purposes,
-	 * we have to use reflection here as long as we keep compiling against Hibernate 3.x jars.
-	 */
-	private static final Method openSessionMethod = ClassUtils.getMethod(SessionFactory.class, "openSession");
-
 	static final Log logger = LogFactory.getLog(SessionFactoryUtils.class);
 
 
@@ -103,17 +93,6 @@ public abstract class SessionFactoryUtils {
 		return null;
 	}
 
-	/**
-	 * Obtain a new Session from the given SessionFactory.
-	 * <p>Bridges between Hibernate signature differences.
-	 * @param sessionFactory the SessionFactory to use
-	 * @return the new Session
-	 * @see org.hibernate.SessionFactory#openSession()
-	 */
-	public static Session openSession(SessionFactory sessionFactory) {
-		return (Session) ReflectionUtils.invokeMethod(openSessionMethod, sessionFactory);
-	}
-
 	/**
 	 * Perform actual closing of the Hibernate Session,
 	 * catching and logging any cleanup exceptions thrown.

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/SessionHolder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/SpringFlushSynchronization.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/SpringJtaSessionContext.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/SpringSessionContext.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/SpringSessionSynchronization.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/support/OpenSessionInViewFilter.java

@@ -203,7 +203,7 @@ public class OpenSessionInViewFilter extends OncePerRequestFilter {
 	 */
 	protected Session openSession(SessionFactory sessionFactory) throws DataAccessResourceFailureException {
 		try {
-			Session session = SessionFactoryUtils.openSession(sessionFactory);
+			Session session = sessionFactory.openSession();
 			session.setFlushMode(FlushMode.MANUAL);
 			return session;
 		}

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/support/OpenSessionInViewInterceptor.java

@@ -184,7 +184,7 @@ public class OpenSessionInViewInterceptor implements AsyncWebRequestInterceptor
 	 */
 	protected Session openSession() throws DataAccessResourceFailureException {
 		try {
-			Session session = SessionFactoryUtils.openSession(getSessionFactory());
+			Session session = getSessionFactory().openSession();
 			session.setFlushMode(FlushMode.MANUAL);
 			return session;
 		}

spring-orm-hibernate4/src/main/java/org/springframework/orm/hibernate4/support/package-info.java

@@ -1,6 +1,6 @@
 
 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.