最近项目上需要openmeetings做视频会议，需要做二次开发。我这边在官网下载的openmeetings 3.3源码进行部署，maven项目，包那些都导入完毕，启动的时候也没报错。但是我访问的时候总是报这个错误，
org.apache.openjpa.persistence.ArgumentException: An error occurred while parsing the query filter "SELECT c FROM Configuration c WHERE c.key IN :keys and c.deleted = false". Error message: The name "Configuration" is not a recognized entity or identifier. Known entity names: []
at org.apache.openjpa.kernel.exps.AbstractExpressionBuilder.parseException(AbstractExpressionBuilder.java:118)
at org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.getClassMetaData(JPQLExpressionBuilder.java:198)
at org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.resolveClassMetaData(JPQLExpressionBuilder.java:168)
at org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.getCandidateMetaData(JPQLExpressionBuilder.java:243)
at org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.getCandidateMetaData(JPQLExpressionBuilder.java:213)
at org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.getCandidateType(JPQLExpressionBuilder.java:206)
at org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder.access$200(JPQLExpressionBuilder.java:81)
at org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder$ParsedJPQL.populate(JPQLExpressionBuilder.java:2444)
at org.apache.openjpa.kernel.jpql.JPQLParser.populate(JPQLParser.java:60)
at org.apache.openjpa.kernel.ExpressionStoreQuery.populateFromCompilation(ExpressionStoreQuery.java:162)
at org.apache.openjpa.datacache.QueryCacheStoreQuery.populateFromCompilation(QueryCacheStoreQuery.java:266)
at org.apache.openjpa.kernel.QueryImpl.newCompilation(QueryImpl.java:679)
at org.apache.openjpa.kernel.QueryImpl.compilationFromCache(QueryImpl.java:652)
at org.apache.openjpa.kernel.QueryImpl.compileForCompilation(QueryImpl.java:619)
at org.apache.openjpa.kernel.QueryImpl.compileForExecutor(QueryImpl.java:688)
at org.apache.openjpa.kernel.QueryImpl.compile(QueryImpl.java:588)
at org.apache.openjpa.persistence.EntityManagerImpl.createNamedQuery(EntityManagerImpl.java:1047)
at org.apache.openjpa.persistence.EntityManagerImpl.createNamedQuery(EntityManagerImpl.java:1026)
at sun.reflect.GeneratedMethodAccessor115.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:298)
at com.sun.proxy.$Proxy15.createNamedQuery(Unknown Source)
at org.apache.openmeetings.db.dao.basic.ConfigurationDao.get(ConfigurationDao.java:96)
at org.apache.openmeetings.db.dao.basic.ConfigurationDao.getConfValue(ConfigurationDao.java:117)
at org.apache.openmeetings.db.dao.basic.ConfigurationDao$$FastClassBySpringCGLIB$$2f9526f2.invoke()
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:721)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:656)
at org.apache.openmeetings.db.dao.basic.ConfigurationDao$$EnhancerBySpringCGLIB$$ab5cc224.getConfValue()
at org.apache.openmeetings.core.mail.MailHandler.init(MailHandler.java:98)
at org.apache.openmeetings.core.mail.MailHandler.sendMails(MailHandler.java:278)
at sun.reflect.GeneratedMethodAccessor117.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.util.MethodInvoker.invoke(MethodInvoker.java:269)
at org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean$MethodInvokingJob.executeInternal(MethodInvokingJobDetailFactoryBean.java:257)
at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:75)
at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573)
看样子是jpa错误，找不到实体类，但是表这些都自动生成了的。在线等！求救求救！
