Getting java.lang.ClassCastException with all the Hibernate entity classes for ehcache

Question

I am using version "1.7.0_79". Getting the following Exception

2016-11-17 16:42:54,127 : ERROR: net.sf.ehcache.store.disk.DiskStorageFactory - Disk Write of
data_member_keys failed: java.lang.ClassCastException: sun.reflect.GeneratedSerializationConstructorAccessor1 cannot be cast to sun.reflect.SerializationConstructorAccessorImpl at sun.reflect.MethodAccessorGenerator.generateSerializationConstructor(MethodAccessorGenerator.java:113) at enter code heresun.reflect.ReflectionFactory.newConstructorForSerialization(ReflectionFactory.java:331) at java.io.ObjectStreamClass.getSerializableConstructor(ObjectStreamClass.java:1376) at java.io.ObjectStreamClass.access$1500(ObjectStreamClass.java:72) at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:493) at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:468) at java.security.AccessController.doPrivileged(Native Method) at java.io.ObjectStreamClass.(ObjectStreamClass.java:468) at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:365) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1133) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347) at net.sf.ehcache.util.MemoryEfficientByteArrayOutputStream.serialize(MemoryEfficientByteArrayOutputStream.java:97) at net.sf.ehcache.store.disk.DiskStorageFactory.serializeElement(DiskStorageFactory.java:405) at net.sf.ehcache.store.disk.DiskStorageFactory.write(DiskStorageFactory.java:384) at net.sf.ehcache.store.disk.DiskStorageFactory$DiskWriteTask.call(DiskStorageFactory.java:485) at net.sf.ehcache.store.disk.DiskStorageFactory$PersistentDiskWriteTask.call(DiskStorageFactory.java:1088) at net.sf.ehcache.store.disk.DiskStorageFactory$PersistentDiskWriteTask.call(DiskStorageFactory.java:1072) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745)

jpa.xml

<bean id="myEmf" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="packagesToScan" value="com.abc.xyz" />
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />
        </property>
        <property name="jpaProperties">
            <props>
                <prop key="hibernate.show_sql">false</prop>
                <prop key="hibernate.format_sql">false</prop>
                <prop key="hibernate.hbm2ddl.auto">validate</prop>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
                <prop key="hibernate.connection.isolation">2</prop>
                <!-- should be turned off in production -->
                <prop key="hibernate.generate_statistics">false</prop>

                <!-- This is the provider for Ehcache provided by Hibernate, using the "old" SPI -->
                <prop key="hibernate.cache.provider_configuration_file_resource_path">/ehcache.xml</prop>
                <prop key="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</prop>
                <prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory</prop>
                <prop key="hibernate.cache.use_second_level_cache">true"</prop>
                <prop key="hibernate.cache.use_query_cache">true</prop>


            </props>
        </property>
    </bean>

ehcache.xml

<?xml version="1.0" encoding="UTF-8"?>

<ehcache>
    <diskStore path="java.io.tmpdir"/>

    <cache name="org.hibernate.cache.spi.UpdateTimestampsCache"
           maxElementsInMemory="50000"
           eternal="true"
           overflowToDisk="true"/>

    <cache name="org.hibernate.cache.internal.StandardQueryCache"
           maxElementsInMemory="50000"
           eternal="false"
           timeToIdleSeconds="120"
           timeToLiveSeconds="120"
           overflowToDisk="true"
           diskPersistent="false"
               diskExpiryThreadIntervalSeconds="120"
           memoryStoreEvictionPolicy="LRU"
            />

    <defaultCache
            maxElementsInMemory="50000"
            eternal="false"
            timeToIdleSeconds="120"
            timeToLiveSeconds="120"
            overflowToDisk="true"
            diskPersistent="false"
            diskExpiryThreadIntervalSeconds="120"
            memoryStoreEvictionPolicy="LRU"
            />

</ehcache>

Does anyone know any solution for this.

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Henri Henri · Accepted Answer · 2016-11-18T19:53:25

You have a class loader issue.

The only way this error can occur is if the class you are currently serializing is from a class loader that doesn't see the SerializationConstructorAccessorImpl used by the current serializer.

I can't tell anything more without knowing the environment where you are experiencing this error.

And my guess is that you are using JDK 1.6.

Getting java.lang.ClassCastException with all the Hibernate entity classes for ehcache

1 Answers