I am using service builders to create new entities in my liferay 6.1 hook. I want to create a many to many relation between one of my custom entities and the user entity of the portal. So I did the following:
<entity name="MyEntity" local-service="true" remote-service="true">
<column name="myEntityId" type="long" primary="true"></column>
<column name="users" type="Collection" entity="com.liferay.portal.User" mapping-table="Users_Garages"></column>
<reference entity="User" package-path="com.liferay.portal"></reference>
</entity>
However when I build my service builder I get the following exception:
Method public java.util.List com.liferay.portal.tools.servicebuilder.ServiceBuilder.getMappingEntities(java.lang.String) throws java.io.IOException threw an exception when invoked on com.liferay.portal.tools.servicebuilder.ServiceBuilder#28a6a735
The problematic instruction:
----------
==> list serviceBuilder.getMappingEntities(column.mappingTable) as mapColumn [on line 260, column 41 in com/liferay/portal/tools/servicebuilder/dependencies/model_impl.ftl]
----------
Java backtrace for programmers:
----------
freemarker.template.TemplateModelException: Method public java.util.List com.liferay.portal.tools.servicebuilder.ServiceBuilder.getMappingEntities(java.lang.String) throws java.io.IOException threw an exception when invoked on com.liferay.portal.tools.servicebuilder.ServiceBuilder#28a6a735
at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:130)
at freemarker.core.MethodCall._getAsTemplateModel(MethodCall.java:93)
at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
at freemarker.core.IteratorBlock.accept(IteratorBlock.java:94)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.Environment.visit(Environment.java:310)
at freemarker.core.CompressedBlock.accept(CompressedBlock.java:73)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:79)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:179)
at freemarker.core.Environment.visit(Environment.java:428)
at freemarker.core.IteratorBlock.accept(IteratorBlock.java:102)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.Environment.process(Environment.java:199)
at freemarker.template.Template.process(Template.java:237)
at com.liferay.portal.freemarker.FreeMarkerUtil.process(FreeMarkerUtil.java:47)
at com.liferay.portal.freemarker.FreeMarkerUtil.process(FreeMarkerUtil.java:37)
at com.liferay.portal.tools.servicebuilder.ServiceBuilder._processTemplate(ServiceBuilder.java:4983)
at com.liferay.portal.tools.servicebuilder.ServiceBuilder._createModelImpl(ServiceBuilder.java:2293)
at com.liferay.portal.tools.servicebuilder.ServiceBuilder.<init>(ServiceBuilder.java:671)
at com.liferay.portal.tools.servicebuilder.ServiceBuilder.main(ServiceBuilder.java:151)
Caused by: java.lang.NullPointerException
at com.liferay.portal.tools.servicebuilder.ServiceBuilder.getMappingEntities(ServiceBuilder.java:1048)
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:606)
at freemarker.ext.beans.BeansWrapper.invokeMethod(BeansWrapper.java:866)
at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:106)
... 27 more
Any help with this ?
Thank You
Create one more entity which will store primary key of both the table. by this you can map many to many relationship table.
Tables :
1. user
2. myentity
3.user_myentity
Related
I'm using Primefaces 6.1 running on a clustered WebLogic Server (Mojarra 2.2.8) Version: 12.2.1.3.0 and during the session replication i'm getting the following exception:
<Jan 30, 2018 4:08:08,727 PM CET> <Error> <Cluster> <BEA-003144> <All session objects should be serializable to replicate. Check the objects in the session. Failed to replicate a non-serializable object in context /app.
java.rmi.MarshalException: failed to marshal create(Lweblogic.rmi.spi.HostID;ILweblogic.cluster.replication.ROID;Ljava.io.Serializable;); nested exception is:
java.io.NotSerializableException: org.primefaces.model.SortMeta
at weblogic.rjvm.BasicOutboundRequest.marshalArgs(BasicOutboundRequest.java:100)
at weblogic.rmi.internal.BasicRemoteRef.invoke(BasicRemoteRef.java:297)
at weblogic.cluster.replication.RemoteReplicationServicesInternalImpl_12213_WLStub.create(Unknown Source)
at sun.reflect.GeneratedMethodAccessor1191.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
Truncated. see log file for complete stacktrace
Caused By: java.io.NotSerializableException: org.primefaces.model.SortMeta
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1184)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
at java.util.ArrayList.writeObject(ArrayList.java:766)
at sun.reflect.GeneratedMethodAccessor31.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
Truncated. see log file for complete stacktrace
JSF component binding is never used in the application. Looking at the Primefaces source I can see that the model SortMeta (does not implements Serializable) is only used in the DataTable component.
The view state saving method has to be server side.
How to solve or avoid this exception?
EDIT:
Problem was caused by the "new" datatable attribute multiViewState.
https://forum.primefaces.org/viewtopic.php?f=3&t=54138&p=164132
Class SortMeta is now Serializable:
https://github.com/primefaces/primefaces/issues/3272
I'm working with a third-party jar for the fact. In this jar there are some interfaces, so when I consume the kie server REST API, I get a JAXB error, the log is at the bottom.
If I try to marshal / un-marshal the BatchExecutionCommand using kie rest api libraries I get no error.
I tried to change the webapps\kieserver\WEB-INF\lib jaxb libraries to the 2.3 versions but the error persists.
Thanks!
org.kie.server.api.marshalling.MarshallingException: Error while creating JAXB context from default classes! 9 counts of IllegalAnnotationExceptions
org.kie.server.api.marshalling.jaxb.JaxbMarshaller.<init>(JaxbMarshaller.java:177)
org.kie.server.api.marshalling.MarshallerFactory.getMarshaller(MarshallerFactory.java:39)
org.kie.server.services.impl.KieContainerInstanceImpl.getMarshaller(KieContainerInstanceImpl.java:111)
org.kie.server.services.impl.marshal.MarshallerHelper.marshal(MarshallerHelper.java:47)
org.kie.server.remote.rest.drools.CommandResource.manageContainer(CommandResource.java:75)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:498)
org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:168)
org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:269)
org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:227)
org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:216)
org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:541)
org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:523)
org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:125)
org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208)
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55)
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50)
javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.kie.server.services.impl.security.web.CaptureHttpRequestFilter.doFilter(CaptureHttpRequestFilter.java:42)
Root Cause: com.sun.xml.bind.v2.runtime.IllegalAnnotationsException: 9 counts of IllegalAnnotationExceptions
uk.co.portaltech.rulesengine.wrappers.Order is an interface, and JAXB can't handle interfaces.
this problem is related to the following location:
I'm using the last version of the generator-jhipster.
I have made a microservice-application, build it, it's a success.
Now I'm creating an entity and when I run it, I get this stack trace:
java.lang.IllegalStateException: Failed to load ApplicationContext
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124)
at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83)
at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:189)
at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:131)
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:230)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:228)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:287)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:289)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:247)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:283)
at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:173)
at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:153)
at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:128)
at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:203)
at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:155)
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:103)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.class]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1583)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1081)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:856)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:111)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98)
at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116)
... 26 common frames omitted
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.persistenceException(EntityManagerFactoryBuilderImpl.java:955)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:880)
at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:60)
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:353)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:373)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:362)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1642)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1579)
... 41 common frames omitted
Caused by: org.hibernate.tool.schema.spi.SchemaManagementException: Schema-validation: missing sequence [hibernate_sequence]
at org.hibernate.tool.schema.internal.AbstractSchemaValidator.validateSequence(AbstractSchemaValidator.java:184)
at org.hibernate.tool.schema.internal.AbstractSchemaValidator.performValidation(AbstractSchemaValidator.java:100)
at org.hibernate.tool.schema.internal.AbstractSchemaValidator.doValidation(AbstractSchemaValidator.java:68)
at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.performDatabaseAction(SchemaManagementToolCoordinator.java:185)
at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.process(SchemaManagementToolCoordinator.java:66)
at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:309)
at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:445)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:877)
... 47 common frames omitted
I didn't modify anything, did I do something wrong ?
I had the same issue and my solution may or may not apply to your case. In my case, a previous version of JHipster had generated the hibernate_sequence only for some database types, not including h2 used for tests.
Check your 00000000000000_initial_schema.xml liquibase file, it should contain the instructions for creating the hibernate_sequence sequence, for instance:
<changeSet id="00000000000000" author="jhipster" dbms="postgresql,oracle">
<createSequence sequenceName="hibernate_sequence" startValue="1000" incrementBy="1"/>
</changeSet>
This did not include h2, so the sequence was not generated during testing and thus Hibernate complained.
I removed the dbms="postgresql,oracle" part and then it worked.
your application is failing to load ApplicationContext. Check your folder where it is configured
#ContextConfiguration (locations = "classpath*:/spring/applicationContext*.xml")
this will load all of your application context xml file.
According to stack trace,
Your test class with SpringJUnit4ClassRunner needs a spring context and your spring configuration for this test class needs a bean that's name entityManagerFactory
You must add this bean to your test config(HibernateJpaAutoConfiguration)
For ex:
in Java Config:
#Bean
public EntityManagerFactory entityManagerFactory(){
return new EntityManagerFactory(...){
....
}
}
or autowired:
#Autowire
private EntityManagerFactory entityManagerFactory;
I have a custom textfield, PersistentPromptTextField that extends TextField and would like to be able to add it my .fxml file. When I do and I run it, I get a list of errors such as this:
Caused by: java.lang.InstantiationException: gui.PersistentPromptTextField
at java.lang.Class.newInstance(Unknown Source)
at sun.reflect.misc.ReflectUtil.newInstance(Unknown Source)
... 75 more
Caused by: java.lang.NoSuchMethodException: gui.PersistentPromptTextField.<init>()
at java.lang.Class.getConstructor0(Unknown Source)
... 77 more
In my .fxml file I have included <?import gui.PersistentPromptTextField?> as well, but obviously I am missing something.
The error raised due to the FXMLLoader is (by default) tried to instantiate the given class using its a no-arg constructor. If you didn't define, try it.
Instantiating using a constructor having some arguments, you need to use #NamedArgs annotation. See this comprehensive answer for more details.
I am using redis in a heavily multi-threaded java application and getting intermittent ClassCastExceptions. Reading through various discussions seemed to point out this might be because the Jedis connection instance getting shared between multiple threads (https://github.com/xetorthio/jedis/issues/359). The solution suggested is to use JedisPool which is thread-safe.
I have configured redis through Spring redis support by using RedisTemplate. A thing to note is I am using multiple templates (to support different models for serialization and de-serialization). Here is snippet of my configuration -
<bean id="jedisConnFactory"
class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"
redis:usePool="true" redis:poolConfig-ref="jedisPoolConfig" redis:hostName="${redis.datasource.hostName}"
redis:database="${redis.database.index}" redis:port="${redis.datastore.port}"/>
<bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
<property name="maxIdle" value="${redis.conn.maxIdle}"/>
<property name="maxTotal" value="${redis.conn.maxTotal}"/>
<property name="minIdle" value="${redis.conn.minIdle}"/>
<property name="testOnBorrow" value="true"/>
</bean>
<bean id="redisTemplate"
class="org.springframework.data.redis.core.RedisTemplate"
redis:connectionFactory-ref="jedisConnFactory"
redis:keySerializer-ref="redisStringSerializer"
redis:valueSerializer-ref="redisStringSerializer"
redis:defaultSerializer-ref="redisStringSerializer"/>
Note the use of usePool=true which prompts spring to use JedisPool. Looking through spring code also suggests that spring is handling resource allocation and release properly.
Any help identifying the issue will be appreciated.
Edit: Stack trace -
Thread 1:
[ERROR] [03/01/2015 07:05:32.044] [events-system-akka.actor.default-dispatcher-2281] [akka://events-system/user/$YN/$b/$b/$b] java.lang.Long cannot be cast to java.util.List
java.lang.ClassCastException: java.lang.Long cannot be cast to java.util.List
at redis.clients.jedis.Connection.getRawObjectMultiBulkReply(Connection.java:230)
at redis.clients.jedis.Connection.getObjectMultiBulkReply(Connection.java:236)
at redis.clients.jedis.BinaryJedis.zscan(BinaryJedis.java:3608)
at org.springframework.data.redis.connection.jedis.JedisConnection$3.doScan(JedisConnection.java:2998)
at org.springframework.data.redis.core.KeyBoundCursor.doScan(KeyBoundCursor.java:39)
at org.springframework.data.redis.core.ScanCursor.scan(ScanCursor.java:85)
at org.springframework.data.redis.core.ScanCursor.hasNext(ScanCursor.java:168)
at org.springframework.data.redis.core.ConvertingCursor.hasNext(ConvertingCursor.java:56)
...
application specific stack trace
...
Thread 2:
[ERROR] [03/01/2015 07:03:07.295] [events-system-akka.actor.default-dispatcher-2273] [akka://events-system/user/$VN/$b/$b/$b] Unknown redis exception; nested exception is java.lang.ClassCastException: [B cannot be cast to java.lang.Long
org.springframework.data.redis.RedisSystemException: Unknown redis exception; nested exception is java.lang.ClassCastException: [B cannot be cast to java.lang.Long
at org.springframework.data.redis.FallbackExceptionTranslationStrategy.getFallback(FallbackExceptionTranslationStrategy.java:48)
at org.springframework.data.redis.FallbackExceptionTranslationStrategy.translate(FallbackExceptionTranslationStrategy.java:38)
at org.springframework.data.redis.connection.jedis.JedisConnection.convertJedisAccessException(JedisConnection.java:195)
at org.springframework.data.redis.connection.jedis.JedisConnection.zRem(JedisConnection.java:2321)
at org.springframework.data.redis.core.DefaultZSetOperations$19.doInRedis(DefaultZSetOperations.java:283)
at org.springframework.data.redis.core.DefaultZSetOperations$19.doInRedis(DefaultZSetOperations.java:280)
at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:190)
at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:152)
at org.springframework.data.redis.core.AbstractOperations.execute(AbstractOperations.java:85)
at org.springframework.data.redis.core.DefaultZSetOperations.remove(DefaultZSetOperations.java:280)
...
application specific stack trace
...
Caused by: java.lang.ClassCastException: [B cannot be cast to java.lang.Long
at redis.clients.jedis.Connection.getIntegerReply(Connection.java:210)
at redis.clients.jedis.BinaryJedis.zrem(BinaryJedis.java:1624)
at org.springframework.data.redis.connection.jedis.JedisConnection.zRem(JedisConnection.java:2319)
... 21 more
Forgot to post an update on this here.
In my case, my analysis was that the connection pool by default used ForkJoinPool which works in a work-stealing mode. This made another thread take over the results part of the operation over and gave ClassCastException when there was a mismatch in Type of the result.
This did resolve the issue I had.