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I think that's the problem:

That's the one for session persistence. you should use org.jbpm.task.

TaskSummary is inside jbpm-human-task.jar I've just check it:

package org.jbpm.task.query;

...

public class TaskSummary

and the persistence.xml file looks like:

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

<persistence version="1.0"

             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence

                                 http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd

                                 http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm_1_0.xsd"

             xmlns:orm="http://java.sun.com/xml/ns/persistence/orm"

             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

             xmlns="http://java.sun.com/xml/ns/persistence">

  <persistence-unit name="org.jbpm.task">

    <provider>org.hibernate.ejb.HibernatePersistence</provider>

    <class>org.jbpm.task.Attachment</class>

    <class>org.jbpm.task.Content</class>

    <class>org.jbpm.task.BooleanExpression</class>

    <class>org.jbpm.task.Comment</class>

    <class>org.jbpm.task.Deadline</class>

    <class>org.jbpm.task.Comment</class>

    <class>org.jbpm.task.Deadline</class>

    <class>org.jbpm.task.Delegation</class>

    <class>org.jbpm.task.Escalation</class>

    <class>org.jbpm.task.Group</class>

    <class>org.jbpm.task.I18NText</class>

    <class>org.jbpm.task.Notification</class>

    <class>org.jbpm.task.EmailNotification</class>

    <class>org.jbpm.task.EmailNotificationHeader</class>

    <class>org.jbpm.task.PeopleAssignments</class>

    <class>org.jbpm.task.Reassignment</class>

    <class>org.jbpm.task.Status</class>

    <class>org.jbpm.task.Task</class>

    <class>org.jbpm.task.TaskData</class>

    <class>org.jbpm.task.SubTasksStrategy</class>

    <class>org.jbpm.task.OnParentAbortAllSubTasksEndStrategy</class>

    <class>org.jbpm.task.OnAllSubTasksEndParentEndStrategy</class>

    <class>org.jbpm.task.User</class>

    <properties>

      <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"/>

      <property name="hibernate.connection.driver_class" value="org.h2.Driver"/>

      <property name="hibernate.connection.url" value="jdbc:h2:mem:mydb" />

      <property name="hibernate.connection.username" value="sa"/>

      <property name="hibernate.connection.password" value="sasa"/>

      <property name="hibernate.connection.autocommit" value="false" />

      <property name="hibernate.max_fetch_depth" value="3"/>

      <property name="hibernate.hbm2ddl.auto" value="create" />

      <property name="hibernate.show_sql" value="false" />

    </properties>

  </persistence-unit>

</persistence>

Cheers