Java – hibernate – entity manager factory

2020-09-06 • Java

I recently encountered a problem that my web application can't start normally, and the stack trace can't tell exactly what happened I've been able to isolate it from the event listener I wrote Whenever I try to activate it, I get a very general exception:

org.jboss.seam.InstantiationException: Could not instantiate Seam component: entityManagerFactory
    at org.jboss.seam.Component.newInstance(Component.java:2144)
    at org.jboss.seam.contexts.Contexts.startup(Contexts.java:304)
    at org.jboss.seam.contexts.Contexts.startup(Contexts.java:278)
    at org.jboss.seam.contexts.ServletLifecycle.endInitialization(ServletLifecycle.java:116)
    at org.jboss.seam.init.Initialization.init(Initialization.java:740)
    at org.jboss.seam.servlet.SeamListener.contextInitialized(SeamListener.java:36)
    at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:645)
    at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:189)
    at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:978)
    at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:586)
    at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:349)
    at org.mortbay.jetty.plugin.JettyWebAppContext.doStart(JettyWebAppContext.java:102)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)
    at org.eclipse.jetty.server.handler.HandlerCollection.doStart(HandlerCollection.java:165)
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:162)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)
    at org.eclipse.jetty.server.handler.HandlerCollection.doStart(HandlerCollection.java:165)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)
    at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:92)
    at org.eclipse.jetty.server.Server.doStart(Server.java:228)
    at org.mortbay.jetty.plugin.JettyServer.doStart(JettyServer.java:69)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)
    at org.mortbay.jetty.plugin.AbstractJettyMojo.startJetty(AbstractJettyMojo.java:433)
    at org.mortbay.jetty.plugin.AbstractJettyMojo.execute(AbstractJettyMojo.java:377)
    at org.mortbay.jetty.plugin.JettyRunWarMojo.execute(JettyRunWarMojo.java:68)
    at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:569)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:539)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
    at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
    at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
    at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
    at org.codehaus.classworlds.Launcher.main(Launcher.java:375)

Now, I have encountered this problem in the past because I try to optimize each entity class by making setters and getters finally Hibernate needs to set proxy for entity classes, so it can delay loading things, so if I make a setter / getter final, it can't do so

The event listener I want to use is essentially listening for persistent and update events When a occurs, the current date should be set on the field annotated with the corresponding annotation to mark the field as the current date to be set

I'm thinking this is because I'm running a newer version of javassist:

Javassist is: javassist is: jar: 3.11 0. GA: running

Has anyone ever encountered this problem?

I run JBoss seam 2.2 on jetty 7 0.GA.

persistence. XML (abbreviated version)

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
             version="1.0">
    <persistence-unit name="${jdbc.database}" transaction-type="RESOURCE_LOCAL">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <non-jta-data-source>${jdbc.datasource.name}</non-jta-data-source>

        <class> ... classes go here </class>

        <exclude-unlisted-classes>true</exclude-unlisted-classes>
        <properties>
            <property name="hibernate.dialect" value="${hibernate.dialect}"/>
            <property name="hibernate.hbm2ddl.auto" value="${ddl.mode}"/>

            <property name="hibernate.show_sql" value="${hibernate.showsql}"/>
            <property name="format_sql" value="${hibernate.formatsql}"/>
            <property name="use_sql_comments" value="${hibernate.usesqlComments}"/>

            <property name="hibernate.jdbc.batch_versioned_data" value="true"/>

            <property name="hibernate.cache.provider_class" value="org.hibernate.cache.EHCacheProvider"/>

            <property name="hibernate.cache.provider_class" value="org.hibernate.cache.EhCacheProvider"/>
            <property name="hibernate.cache.use_query_cache" value="true"/>
            <property name="hibernate.cache.provider_configuration_file_resource_path" value="/ehcache.xml"/>

            <property name="hibernate.connection.release_mode" value="after_transaction"/>
            <property name="hibernate.connection.autocommit" value="true"/>

            <!-- Current Date listeners -->
            <!--
            <property name="hibernate.ejb.event.pre-insert" value="org.hibernate.ejb.event.EJB3PersistEventListener,com.walterjwhite.listener.persistence.listener.SetCurrentDateListener"/>
            <property name="hibernate.ejb.event.pre-update" value="org.hibernate.ejb.event.EJB3MergeEventListener,com.walterjwhite.listener.persistence.listener.SetCurrentDateListener"/>
            -->

            <!-- Envers listeners -->
            <property name="hibernate.ejb.event.post-insert" value="org.hibernate.ejb.event.EJB3PostInsertEventListener,org.hibernate.envers.event.AuditEventListener"/>
            <property name="hibernate.ejb.event.post-update" value="org.hibernate.ejb.event.EJB3PostUpdateEventListener,org.hibernate.envers.event.AuditEventListener"/>
            <property name="hibernate.ejb.event.post-delete" value="org.hibernate.ejb.event.EJB3PostDeleteEventListener,org.hibernate.envers.event.AuditEventListener"/>
            <property name="hibernate.ejb.event.pre-collection-update" value="org.hibernate.envers.event.AuditEventListener"/>
            <property name="hibernate.ejb.event.pre-collection-remove" value="org.hibernate.envers.event.AuditEventListener"/>
            <property name="hibernate.ejb.event.post-collection-recreate" value="org.hibernate.envers.event.AuditEventListener"/>

            <!--    Hibernate Search    -->
            <property name="hibernate.search.default.directory_provider" value="org.hibernate.search.store.FSDirectoryProvider"/>
            <property name="hibernate.search.default.indexBase" value="${application.directory}/lucene/indexes"/>
        </properties>
    </persistence-unit>
</persistence>

When I use javassist 3.4 GA instead of 3.11 GA, I received this error

java.lang.IllegalAccessError: tried to access class javassist.bytecode.StackMapTable$Writer from class org.jboss.seam.util.ProxyFactory
    at org.jboss.seam.util.ProxyFactory.makeConstructor(ProxyFactory.java:803)
    at org.jboss.seam.util.ProxyFactory.makeConstructors(ProxyFactory.java:685)
    at org.jboss.seam.util.ProxyFactory.make(ProxyFactory.java:565)
    at org.jboss.seam.util.ProxyFactory.createClass3(ProxyFactory.java:346)
    at org.jboss.seam.util.ProxyFactory.createClass2(ProxyFactory.java:325)
    at org.jboss.seam.util.ProxyFactory.createClass(ProxyFactory.java:284)
    at org.jboss.seam.Component.createProxyFactory(Component.java:2426)
    at org.jboss.seam.Component.getProxyFactory(Component.java:1513)
    at org.jboss.seam.Component.wrap(Component.java:1504)
    at org.jboss.seam.Component.instantiateJavaBean(Component.java:1442)
    at org.jboss.seam.Component.instantiate(Component.java:1359)
    at org.jboss.seam.Component.newInstance(Component.java:2122)
    at org.jboss.seam.contexts.Contexts.startup(Contexts.java:304)
    at org.jboss.seam.contexts.Contexts.startup(Contexts.java:278)
    at org.jboss.seam.contexts.ServletLifecycle.endInitialization(ServletLifecycle.java:116)
    at org.jboss.seam.init.Initialization.init(Initialization.java:740)
    at org.jboss.seam.servlet.SeamListener.contextInitialized(SeamListener.java:36)
    at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:645)
    at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:189)
    at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:978)
    at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:586)
    at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:349)
    at org.mortbay.jetty.plugin.JettyWebAppContext.doStart(JettyWebAppContext.java:102)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)
    at org.eclipse.jetty.server.handler.HandlerCollection.doStart(HandlerCollection.java:165)
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:162)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)
    at org.eclipse.jetty.server.handler.HandlerCollection.doStart(HandlerCollection.java:165)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)
    at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:92)
    at org.eclipse.jetty.server.Server.doStart(Server.java:228)
    at org.mortbay.jetty.plugin.JettyServer.doStart(JettyServer.java:69)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:55)
    at org.mortbay.jetty.plugin.AbstractJettyMojo.startJetty(AbstractJettyMojo.java:433)
    at org.mortbay.jetty.plugin.AbstractJettyMojo.execute(AbstractJettyMojo.java:377)
    at org.mortbay.jetty.plugin.JettyRunWarMojo.execute(JettyRunWarMojo.java:68)
    at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:569)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:539)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
    at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
    at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
    at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
    at org.codehaus.classworlds.Launcher.main(Launcher.java:375)

Walter

Solution

My suggestion is:

This way, you don't have to worry about the libraries your project needs

The message is:

org.jboss.seam.InstantiationException: Could not instantiate Seam component: entityManagerFactory

Have you set up your entitymanagerfactory?

If not, please do the following (I assume you do not use JTA environment, so I will show you a resource_local entitymanagerfactory)

/WEB-INF/components.xml

<!--I AM USING 2.1 version-->
<!--SO I SUPPOSE YOU HAVE TO REPLACE 2.1 by 2.2-->
<components xmlns="http://jboss.com/products/seam/components"
        xmlns:core="http://jboss.com/products/seam/core"
        xmlns:persistence="http://jboss.com/products/seam/persistence"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation=
            "http://jboss.com/products/seam/core http://jboss.com/products/seam/core-2.1.xsd 
             http://jboss.com/products/seam/persistence http://jboss.com/products/seam/persistence-2.1.xsd 
             http://jboss.com/products/seam/components http://jboss.com/products/seam/components-2.1.xsd">

<!--SET UP A MANAGED EntityManagerFactory-->
<!--DEFAULT TO ScopeType.APPLICATION-->
<persistence:entity-manager-factory name="entityManagerFactory" persistence-unit-name="<PERSISTENCE_UNIT_NAME_MUST_MATCH_NAME_ATTRIBUTE_IN_PERSISTENCE.XML>"/>

<!--SET UP A MANAGED EntityManager-->
<!--DEFAULT TO ScopeType.CONVERSATION-->
<persistence:managed-persistence-context name="entityManager" entity-manager-factory="#{entityManagerFactory}" auto-create="true"/>

<!--SET UP SEAM TRANSACTION MANAGER-->
<!--IT TAKES CARE OF CALLING BEGIN AND COMMIT-->
<tx:entity-transaction entity-manager="#{entityManager}"/>

</components>

Note that you do not have to set the create attribute in the @ in annotation when using the auto create attribute equal to true

// You do not need to set up create attribute 
// because of auto-create atrribute in persistence:managed-persistence-context component
@In(create=true)
private EntityManager entityManager;

By using a naming convention, the entitymanager reference must match the name attribute in persistence: the managed persistence context component

Now you must define / meta - inf / persistence xml

/Meta-INF/persistence.xml

<persistence-unit name="<PERSISTENCE_UNIT_NAME_GOES_HERE>" transaction-type="RESOURCE_LOCAL">
    // Set up properties here
</persistence-unit>

If you are using a data source that can be obtained through JNDI – you need to set it according to the target application server (tomcat, jetty, etc.), please do the following

/Meta-INF/persistence.xml

<persistence-unit name="<PERSISTENCE_UNIT_NAME_GOES_HERE>">
    <non-jta-data-source>jdbc/myAppDS</non-jta-data-source>
</persistence-unit>

If you want to set the current date, do the following instead of using hibernate events

<!--currentDate IS A BUILT-IN Seam component-->
<!--DEFAULT TO ScopeType.STATELESS-->
<!--ScopeType.STATELESS IS SIMILAR TO Spring prototype scope-->
<h:inputHidden value="#{currentDate}" rendered="false" binding="#{mybackingBean.currentDate}"/>

For the final keyword, you may want to see I get a log message: Reflection optimizer disabled

to greet,

The content of this article comes from the network collection of netizens. It is used as a learning reference. The copyright belongs to the original author.

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