Re: Hibernate ClassCastException in GWT hosted mode only

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* Hibernate, Relational Persistence for Idiomatic Java
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package org.hibernate.service.classloading.internal;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.ServiceLoader;

import org.hibernate.cfg.AvailableSettings;
import org.hibernate.service.classloading.spi.ClassLoaderService;
import org.hibernate.service.classloading.spi.ClassLoadingException;

/**
* Standard implementation of the service for interacting with class loaders
*
* @author Steve Ebersole
*/
public class ClassLoaderServiceImpl implements ClassLoaderService {
private final ClassLoader classClassLoader;
private final ClassLoader resourcesClassLoader;

public ClassLoaderServiceImpl() {
this( ClassLoaderServiceImpl.class.getClassLoader() );
}

public ClassLoaderServiceImpl(ClassLoader classLoader) {
this( classLoader, classLoader, classLoader, classLoader );
}

public ClassLoaderServiceImpl(
ClassLoader applicationClassLoader,
ClassLoader resourcesClassLoader,
ClassLoader hibernateClassLoader,
ClassLoader environmentClassLoader) {
// Normalize missing loaders
if ( hibernateClassLoader == null ) {
hibernateClassLoader = ClassLoaderServiceImpl.class.getClassLoader();
}

if ( environmentClassLoader == null || applicationClassLoader == null ) {
ClassLoader sysClassLoader = locateSystemClassLoader();
ClassLoader tccl = locateTCCL();
if ( environmentClassLoader == null ) {
environmentClassLoader = sysClassLoader != null ? sysClassLoader : hibernateClassLoader;
}
if ( applicationClassLoader == null ) {
applicationClassLoader = tccl != null ? tccl : hibernateClassLoader;
}
}

if ( resourcesClassLoader == null ) {
resourcesClassLoader = applicationClassLoader;
}

final LinkedHashSet<ClassLoader> classLoadingClassLoaders = new LinkedHashSet<ClassLoader>();
classLoadingClassLoaders.add( applicationClassLoader );
classLoadingClassLoaders.add( hibernateClassLoader );
classLoadingClassLoaders.add( environmentClassLoader );

//this.classClassLoader = new ClassLoader() {
System.out.println("PATCH: https://hibernate.onjira.com/browse/HHH-7084");
this.classClassLoader = new ClassLoader( applicationClassLoader ) {
@Override
protected Class<?> findClass(String name) throws ClassNotFoundException {
for ( ClassLoader loader : classLoadingClassLoaders ) {
try {
return loader.loadClass( name );
}
catch (Exception ignore) {
}
}
throw new ClassNotFoundException( "Could not load requested class : " + name );
}
};

this.resourcesClassLoader = resourcesClassLoader;
}

@SuppressWarnings( {"UnusedDeclaration"})
public static ClassLoaderServiceImpl fromConfigSettings(Map configVales) {
return new ClassLoaderServiceImpl(
(ClassLoader) configVales.get( AvailableSettings.APP_CLASSLOADER ),
(ClassLoader) configVales.get( AvailableSettings.RESOURCES_CLASSLOADER ),
(ClassLoader) configVales.get( AvailableSettings.HIBERNATE_CLASSLOADER ),
(ClassLoader) configVales.get( AvailableSettings.ENVIRONMENT_CLASSLOADER )
);
}

private static ClassLoader locateSystemClassLoader() {
try {
return ClassLoader.getSystemClassLoader();
}
catch ( Exception e ) {
return null;
}
}

private static ClassLoader locateTCCL() {
try {
return Thread.currentThread().getContextClassLoader();
}
catch ( Exception e ) {
return null;
}
}

@Override
@SuppressWarnings( {"unchecked"})
public <T> Class<T> classForName(String className) {
try {
return (Class<T>) Class.forName( className, true, classClassLoader );
}
catch (Exception e) {
throw new ClassLoadingException( "Unable to load class [" + className + "]", e );
}
}

@Override
public URL locateResource(String name) {
// first we try name as a URL
try {
return new URL( name );
}
catch ( Exception ignore ) {
}

try {
return resourcesClassLoader.getResource( name );
}
catch ( Exception ignore ) {
}

return null;
}

@Override
public InputStream locateResourceStream(String name) {
// first we try name as a URL
try {
return new URL( name ).openStream();
}
catch ( Exception ignore ) {
}

try {
return resourcesClassLoader.getResourceAsStream( name );
}
catch ( Exception ignore ) {
}

return null;
}

@Override
public List<URL> locateResources(String name) {
ArrayList<URL> urls = new ArrayList<URL>();
try {
Enumeration<URL> urlEnumeration = resourcesClassLoader.getResources( name );
if ( urlEnumeration != null && urlEnumeration.hasMoreElements() ) {
while ( urlEnumeration.hasMoreElements() ) {
urls.add( urlEnumeration.nextElement() );
}
}
}
catch ( Exception ignore ) {
}

return urls;
}

@Override
public <S> LinkedHashSet<S> loadJavaServices(Class<S> serviceContract) {
final ClassLoader serviceLoaderClassLoader = new ClassLoader() {
final ClassLoader[] classLoaderArray = new ClassLoader[] {
// first look on the hibernate class loader
getClass().getClassLoader(),
// next look on the resource class loader
resourcesClassLoader,
// finally look on the combined class class loader
classClassLoader
};

@Override
public Enumeration<URL> getResources(String name) throws IOException {
final HashSet<URL> resourceUrls = new HashSet<URL>();

for ( ClassLoader classLoader : classLoaderArray ) {
final Enumeration<URL> urls = classLoader.getResources( name );
while ( urls.hasMoreElements() ) {
resourceUrls.add( urls.nextElement() );
}
}

return new Enumeration<URL>() {
final Iterator<URL> resourceUrlIterator = resourceUrls.iterator();
@Override
public boolean hasMoreElements() {
return resourceUrlIterator.hasNext();
}

@Override
public URL nextElement() {
return resourceUrlIterator.next();
}
};
}

@Override
protected Class<?> findClass(String name) throws ClassNotFoundException {
for ( ClassLoader classLoader : classLoaderArray ) {
try {
return classLoader.loadClass( name );
}
catch (Exception ignore) {
}
}

throw new ClassNotFoundException( "Could not load requested class : " + name );
}
};

final ServiceLoader<S> loader = ServiceLoader.load( serviceContract, serviceLoaderClassLoader );
final LinkedHashSet<S> services = new LinkedHashSet<S>();
for ( S service : loader ) {
services.add( service );
}

return services;
}
}
Hi all,

here the procedure to apply the patch while  4.1.4 is not relased.

1. create a source folder (ie: src_patch) in your eclipse project

2. create the package org.hibernate.service.classloading.internal;

3. copy the patched source file ClassLoaderServiceImpl.java (attached) in the package (patch from v4.1.3)

-> eclipse will compile the class in web-inf/classes and it will override the old class

Vincent

Le jeudi 17 mai 2012 20:46:37 UTC+2, Christomania a écrit :

Has somebody found a way to try the patch described here  https://hibernate.onjira.com/browse/HHH-7084 ?

Le mardi 1 mai 2012 18:42:18 UTC+2, AK a écrit :

Same question, as it has been almost 2 months.  Any word on ways to
get this to work without downgrading hibernate?

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