javax.ejb.EJBException: This exception has no message.

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com.sun.jdo.api.persistence.support.JDODataStoreException: JDO77006: SQL exception: state = null, error code = 0. NestedException: java.sql.SQLException: Error in allocating a connection. Cause: Connection could not be allocated because: Communications link failure Last packet sent to the server was 0 ms ago.
at com.sun.jdo.spi.persistence.support.sqlstore.impl.TransactionImpl.getConnectionInternal(TransactionImpl.java:1465)
at com.sun.jdo.spi.persistence.support.sqlstore.impl.TransactionImpl.getConnection(TransactionImpl.java:1358)
at com.sun.jdo.spi.persistence.support.sqlstore.SQLStoreManager.executeQuery(SQLStoreManager.java:447)
at com.sun.jdo.spi.persistence.support.sqlstore.SQLStoreManager.retrieve(SQLStoreManager.java:376)
at com.sun.jdo.spi.persistence.support.sqlstore.SQLStateManager.retrieve(SQLStateManager.java:2059)
at com.sun.jdo.spi.persistence.support.sqlstore.SQLStateManager.reload(SQLStateManager.java:1197)
at com.sun.jdo.spi.persistence.support.sqlstore.SQLStateManager.reload(SQLStateManager.java:1153)
at com.sun.jdo.spi.persistence.support.sqlstore.impl.PersistenceManagerImpl.getObjectById(PersistenceManagerImpl.java:658)
at com.sun.jdo.spi.persistence.support.sqlstore.impl.PersistenceManagerWrapper.getObjectById(PersistenceManagerWrapper.java:276)
at sun.reflect.GeneratedMethodAccessor156.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.enterprise.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1011)
at com.sun.ejb.containers.BaseContainer.invokeTargetBeanMethod(BaseContainer.java:2920)
at com.sun.ejb.containers.EntityContainer.invokeFindByPrimaryKey(EntityContainer.java:803)
at com.sun.ejb.containers.EJBLocalHomeInvocationHandler.invoke(EJBLocalHomeInvocationHandler.java:233)

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