Hibernate ClassCastException in GWT hosted mode only

[Alexander Lochschmied]

Hello and thanks for watching ;-)

 

Our problem/error is:

 

javax.persistence.PersistenceException: [PersistenceUnit: PUname] Unable to build EntityManagerFactory

...
Caused by: org.hibernate.HibernateException: Could not instantiate dialect class

...
Caused by: java.lang.ClassCastException: org.hibernate.dialect.MySQLDialect cannot be cast to org.hibernate.dialect.Dialect

...

(see full stack trace at the bottom)

 

It occurs in a GWT based web application using the following technologies:

·         Maven

·         Hibernate EntityManager /JPA

·         Guice

·         GWT

·         GWT-P

·         GWT Maven Plugin

·         ...

 

The fact to stress is that it does work in Tomcat.

Only in development mode aka hosted mode (with Jetty), using GWT Maven Plugin (with goal gwt:run), we get the ClassCastException. We were playing with Hibernate dependencies without luck.

The ClassCastException is thrown on startup of JPA before any service is actually used.

BTW: JPA is setup using Guice:

        install(new JpaPersistModule("PUname"));

        filter("/*").through(PersistFilter.class);

 

It may be worth mentioning that disabling the dialect setting (in persistence.xml) creates another ClassCastException also on JPA startup:

javax.persistence.PersistenceException: [PersistenceUnit: dsmgmt] Unable to build EntityManagerFactory

...

Caused by: org.hibernate.HibernateException: Unable to instantiate specified TransactionFactory class [org.hibernate.engine.transaction.internal.jdbc.JdbcTransactionFactory]

...

Caused by: java.lang.ClassCastException: org.hibernate.engine.transaction.internal.jdbc.JdbcTransactionFactory cannot be cast to org.hibernate.engine.transaction.spi.TransactionFactory

...

 

Why does it break in Jetty? What could be causing it or how can it be fixed?

 

File: META-INF/persistence.xml

<persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.0" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">

            <persistence-unit name="PUname" transaction-type="RESOURCE_LOCAL">

                        <provider>org.hibernate.ejb.HibernatePersistence</provider>

                        <class>our.test.class</class>

                        <properties>

                                   <property name="hibernate.connection.username" value="user"/>

                                   <property name="hibernate.connection.password" value="pass"/>

                                   <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>

                                   <property name="hibernate.connection.url" value="jdbc:mysql://machine:3306/db"/>

                                   <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>

                                   <property name="hibernate.hbm2ddl.auto" value="update"/>

                        </properties>

            </persistence-unit>

</persistence>

 

Our JARs in the webapp:

           445.288 antlr-2.7.7.jar

           150.774 antlr-runtime-3.1.3.jar

             4.467 aopalliance-1.0.jar

            57.963 classmate-0.5.4.jar

           575.389 commons-collections-3.2.1.jar

            52.543 commons-exec-1.1.jar

            59.590 commons-fileupload-1.2.2.jar

           163.151 commons-io-2.1.jar

           284.220 commons-lang-2.6.jar

           313.898 dom4j-1.6.1.jar

           131.929 dsmgmt-shared-0.1-SNAPSHOT.jar

         1.006.424 ehcache-core-2.4.3.jar

           710.492 guice-3.0.jar

            36.998 guice-assistedinject-3.0.jar

            27.633 guice-persist-3.0.jar

            65.012 guice-servlet-3.0.jar

         5.004.997 gwt-servlet-2.3.0.jar

            28.339 gwtp-dispatch-server-0.6.jar

            17.184 gwtp-dispatch-server-guice-0.6.jar

            30.402 gwtp-dispatch-shared-0.6.jar

            81.426 hibernate-commons-annotations-4.0.0.Final.jar

         4.347.499 hibernate-core-4.0.0.CR6.jar

           127.259 hibernate-ehcache-4.0.0.CR6.jar

           471.832 hibernate-entitymanager-4.0.0.CR6.jar

           102.661 hibernate-jpa-2.0-api-1.0.1.Final.jar

           366.592 hibernate-validator-4.2.0.Final.jar

            70.928 jandex-1.0.3.Final.jar

           644.148 javassist-3.12.1.GA.jar

             2.497 javax.inject-1.jar

            60.542 jboss-logging-3.1.0.CR1.jar

            11.209 jboss-transaction-api_1.1_spec-1.0.0.Final.jar

           859.016 jna-3.2.3.jar

           213.781 jsch-0.1.44-1.jar

           281.579 jsoup-1.6.1.jar

           481.535 log4j-1.2.16.jar

           789.885 mysql-connector-java-5.1.18.jar

         1.351.561 org.eclipse.jgit-1.0.0.201106090707-r.jar

           601.287 pd4ml-3.80b1.jar

           149.846 pd4ml-ss-css-3.80b1.jar

            25.962 slf4j-api-1.6.4.jar

             9.748 slf4j-log4j12-1.6.4.jar

           743.673 sqljet-1.0.4.jar

           172.023 stringtemplate-3.2.jar

         1.889.196 svnkit-1.3.5.jar

           251.371 trilead-ssh2-build213-svnkit-1.3-patch.jar

            47.433 validation-api-1.0.0.GA.jar

           109.318 xml-apis-1.0.b2.jar

 

The full stacktrace:

javax.persistence.PersistenceException: [PersistenceUnit: PUname] Unable to build EntityManagerFactory
       at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:916)
       at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:887)
       at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:56)
       at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63)
       at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:47)
       at com.google.inject.persist.jpa.JpaPersistService.start(JpaPersistService.java:94)
       at com.google.inject.persist.PersistFilter.init(PersistFilter.java:77)
       at com.google.inject.servlet.FilterDefinition.init(FilterDefinition.java:114)
       at com.google.inject.servlet.ManagedFilterPipeline.initPipeline(ManagedFilterPipeline.java:98)
       at com.google.inject.servlet.GuiceFilter.init(GuiceFilter.java:172)
       at org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:97)
       at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
       at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:593)
       at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
       at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1220)
       at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:513)
       at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448)
       at com.google.gwt.dev.shell.jetty.JettyLauncher$WebAppContextWithReload.doStart(JettyLauncher.java:468)
       at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
       at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
       at org.mortbay.jetty.handler.RequestLogHandler.doStart(RequestLogHandler.java:115)
       at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
       at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
       at org.mortbay.jetty.Server.doStart(Server.java:222)
       at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
       at com.google.gwt.dev.shell.jetty.JettyLauncher.start(JettyLauncher.java:672)
       at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:509)
       at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1068)
       at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:811)
       at com.google.gwt.dev.DevMode.main(DevMode.java:311)
Caused by: org.hibernate.HibernateException: Could not instantiate dialect class
       at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.constructDialect(DialectFactoryImpl.java:82)
       at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:64)
       at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:142)
       at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:81)
       at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:160)
       at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:133)
       at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:71)
       at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2259)
       at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2255)
       at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1724)
       at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:76)
       at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:907)
       at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:887)
       at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:56)
       at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63)
       at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:47)
       at com.google.inject.persist.jpa.JpaPersistService.start(JpaPersistService.java:94)
       at com.google.inject.persist.PersistFilter.init(PersistFilter.java:77)
       at com.google.inject.servlet.FilterDefinition.init(FilterDefinition.java:114)
       at com.google.inject.servlet.ManagedFilterPipeline.initPipeline(ManagedFilterPipeline.java:98)
       at com.google.inject.servlet.GuiceFilter.init(GuiceFilter.java:172)
       at org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:97)
       at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
       at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:593)
       at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
       at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1220)
       at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:513)
       at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448)
       at com.google.gwt.dev.shell.jetty.JettyLauncher$WebAppContextWithReload.doStart(JettyLauncher.java:468)
       at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
       at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
       at org.mortbay.jetty.handler.RequestLogHandler.doStart(RequestLogHandler.java:115)
       at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
       at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
       at org.mortbay.jetty.Server.doStart(Server.java:222)
       at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
       at com.google.gwt.dev.shell.jetty.JettyLauncher.start(JettyLauncher.java:672)
       at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:509)
       at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1068)
       at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:811)
       at com.google.gwt.dev.DevMode.main(DevMode.java:311)
Caused by: java.lang.ClassCastException: org.hibernate.dialect.MySQLDialect cannot be cast to org.hibernate.dialect.Dialect
       at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.constructDialect(DialectFactoryImpl.java:73)
       at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:64)
       at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:142)
       at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:81)
       at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:160)
       at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:133)
       at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:71)
       at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2259)
       at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2255)
       at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1724)
       at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:76)
       at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:907)
       at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:887)
       at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:56)
       at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63)
       at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:47)
       at com.google.inject.persist.jpa.JpaPersistService.start(JpaPersistService.java:94)
       at com.google.inject.persist.PersistFilter.init(PersistFilter.java:77)
       at com.google.inject.servlet.FilterDefinition.init(FilterDefinition.java:114)
       at com.google.inject.servlet.ManagedFilterPipeline.initPipeline(ManagedFilterPipeline.java:98)
       at com.google.inject.servlet.GuiceFilter.init(GuiceFilter.java:172)
       at org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:97)
       at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
       at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:593)
       at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
       at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1220)
       at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:513)
       at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448)
       at com.google.gwt.dev.shell.jetty.JettyLauncher$WebAppContextWithReload.doStart(JettyLauncher.java:468)
       at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
       at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
       at org.mortbay.jetty.handler.RequestLogHandler.doStart(RequestLogHandler.java:115)
       at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
       at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
       at org.mortbay.jetty.Server.doStart(Server.java:222)
       at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
       at com.google.gwt.dev.shell.jetty.JettyLauncher.start(JettyLauncher.java:672)
       at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:509)
       at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1068)
       at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:811)
       at com.google.gwt.dev.DevMode.main(DevMode.java:311)

 

Best regards,

Alexander

[Juan Pablo Gardella]

Try with http://docs.jboss.org/hibernate/core/4.0/javadocs/org/hibernate/dialect/MySQL5Dialect.html

And see:

http://forum.springsource.org/archive/index.php/t-53779.html (said you must remove validation-api.jar)

Juan

2011/11/16 Alexander Lochschmied <alexander....@gmail.com>

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[Alexander Lochschmied]

It only becomes:

Caused by: java.lang.ClassCastException: org.hibernate.dialect.MySQL5Dialect cannot be cast to org.hibernate.dialect.Dialect

We haven playing with those JARs as there may be incompatibilities (JPA 1 vs 2) I think. Currently we do not reference them (hibernate-jpa-2.0-api, hibernate-validator and validation-api).

Could it be a class loading issue? I see the following in log with JPA setup being disabled (that's when Jetty starts normally):

JspRuntimeContext  - Parent class loader is: ContextLoader@null

Thanks Juan!

[Alexander Lochschmied]

Sorry for the typo; wanted to say: We have been playing ...

[Juan Pablo Gardella]

I have a sample that use hibernate 3.6.x and run inside jetty here: https://bitbucket.org/gardellajuanpablo/gwt-sample/wiki/Home

Check the pom.xml.

If you can't resolve the issue tell me.

Juan

2011/11/18 Alexander Lochschmied <alexander....@gmail.com>

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[kebatshotse setimela]

i cannot solve it

On 11/18/11, Juan Pablo Gardella <gardella...@gmail.com> wrote:
> I have a sample that use hibernate 3.6.x and run inside jetty here:
> https://bitbucket.org/gardellajuanpablo/gwt-sample/wiki/Home
>
> Check the pom.xml.
>
> If you can't resolve the issue tell me.
>
> Juan
>
>
>
> 2011/11/18 Alexander Lochschmied <alexander....@gmail.com>
>
>> It only becomes:
>>
>>
>> Caused by: java.lang.ClassCastException:
>> org.hibernate.dialect.MySQL5Dialect cannot be cast to
>> org.hibernate.dialect.Dialect
>>
>>
>> We haven playing with those JARs as there may be incompatibilities (JPA 1

>> vs 2) I think. Currently we do *not *reference them

[Thomas Broyer]

On Friday, November 18, 2011 2:21:33 PM UTC+1, Alexander Lochschmied wrote:

It only becomes:

Caused by: java.lang.ClassCastException: org.hibernate.dialect.MySQL5Dialect cannot be cast to org.hibernate.dialect.Dialect

We haven playing with those JARs as there may be incompatibilities (JPA 1 vs 2) I think. Currently we do not reference them (hibernate-jpa-2.0-api, hibernate-validator and validation-api).

Could it be a class loading issue?

It's very likely the case yes; generally because the MySQL5Dialect comes from the parent classloader of the one containing the Dialect class. Could it be that some of your dependencies are not in the WEB-INF/lib?

IMO, when using Maven, you should really make at least 2 projects: one for the server and one for the client (you can possibly make server depend on client, but I'd rather make a third project "shared" that both client and server depend on); and you launch the server using the jetty-maven-plugin or whatever, and then run the DevMode in -noserver mode for the client-side code.

The problem is that there's no "scope=client" and "scope=server" in Maven, so everything in scope=compile or scope=runtime will be copied to your webapp's WEB-INF/lib, as expected, but will *also* be in the classpath of the DevMode, because there's no way to know whether your client-side code needs them or not; that leads to having all server classes twice on the classpath of the webapp (because it's a child classloader of the DevMode's one).

[jett]

I'm facing the same issue and was suspecting a class loading issue. I
thought I was inviting trouble when I would place the same Hibernate
annotated class in both the server side code and the GWT client side,
but until upgrading GWT 2.0 to GWT 2.4, I did not experience this
ClassCastException problem.

As Alexander has experienced, things work fine when I deploy the .war
to an external server, and only see problems running in the DevMode.
I see different classes not being "cast-able" depending on my
hibernate.cfg.xml.

I'm still trying to sort out how the switch from GWT 2.0 to 2.4 is a
factor because I made several changes, but I am glad to hear that I'm
not the only one thinking this is a classloader issue.

On Nov 18, 9:54 am, Thomas Broyer <t.bro...@gmail.com> wrote:
> On Friday, November 18, 2011 2:21:33 PM UTC+1, Alexander Lochschmied wrote:
>
> > It only becomes:
>
> > Caused by: java.lang.ClassCastException: org.hibernate.dialect.MySQL5Dialect cannot be cast to org.hibernate.dialect.Dialect
>
> > We haven playing with those JARs as there may be incompatibilities (JPA 1

> > vs 2) I think. Currently we do *not *reference them

[Alexander Lochschmied]

Juan that was a big help. Finally it seems to work with downgraded Hibernate (3.6.3) and additional dependencies:

<dependency>

<groupId>javax.validation</groupId>

<artifactId>validation-api</artifactId>

<!--version>1.0.0.GA</version-->

<version>${javax-validation.version}</version>

<scope>provided</scope>

</dependency>

<dependency>

<groupId>javax.validation</groupId>

<artifactId>validation-api</artifactId>

<!--version>1.0.0.GA</version-->

<version>${javax-validation.version}</version>

<classifier>sources</classifier>

<scope>provided</scope>

</dependency>

<dependency>

<groupId>org.hibernate.javax.persistence</groupId>

<artifactId>hibernate-jpa-2.0-api</artifactId>

<!--version>1.0.0.Final</version-->

<version>${hibernate-jpa.version}</version>

</dependency>

<!-- jsr 303 (javax.validation) provider-->

<dependency>

<groupId>org.apache.bval</groupId>

<artifactId>bval-core</artifactId>

<!--version>0.3-incubating</version-->

<version>${bval.version}</version>

</dependency>

<dependency>

<groupId>org.apache.bval</groupId>

<artifactId>bval-jsr303</artifactId>

<!--version>0.3-incubating</version-->

<version>${bval.version}</version>

</dependency>

Thank you very much Juan! And good luck to jett!

[Juan Pablo Gardella]

:) 

2011/11/21 Alexander Lochschmied <alexander....@gmail.com>

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[Artem V. Navrotskiy]

This is Hibernate 4.0.0+ bug:
https://hibernate.onjira.com/browse/HHH-7084

[Lukasz Plotnicki]

Does anybody know a workaround (other then rollback to and old hibernate version) for this issue?

[AK]

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

[Christopher Tarento]

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

[norandom]

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