JPA multi-entity relationship - jpa

Question

How can I write the following relationship in JPA. I have 6 tables: Products, Features, Functions, Tasks, Permissions and Users. I need to be able to create a Product object model that contains a list of Features. Each Feature object model in the list will contain a list of Functions and each Function will contain a list of Tasks. I have no issue building each one of these entities and then relating them together but the problem comes in when I need to filter each entity by its relationship to the Permission table. I'm not sure this can be done. When I map the Permissions entity to each other entity, I seem to get a many-to-many join and too many values are returned. Any insight would be great.
Products
prod_id
user_id
Features
prod_id
feature_id
Functions
prod_id
feature_id
function_id
Tasks
prod_id
feature_id
function_id
task_id
Permissions
prod_id
feature_id
function_id
task_id
user_id
User
user_id
Here is my Permission entity class:
import java.io.Serializable;
import javax.persistence.*;
import static javax.persistence.CascadeType.ALL;
import java.math.BigDecimal;
#IdClass(menu.entity.PermissionKey.class)
#Entity
#Table(name="PERMISSIONS")
#NamedQuery(name = "findPermissionsByUserId",query = "SELECT p FROM Permission p WHERE p.userId = :userId")
public class Permission implements Serializable {
private static final long serialVersionUID = 1L;
#Column(name="AUTH", length=1)
private String auth;
#Column(name="PERM_DESC", length=80)
private String permDesc;
#Id
#Column(name="COMPANY",
nullable = false,
insertable = false,
updatable = false,
length=2)
private String company;
#Id
#Column(name="USER_ID",
nullable = false,
insertable = false,
updatable = false,
length=30)
private String userId;
#Id
#Column(name="PROD_ID", precision=22)
private BigDecimal prodId;
#Id
#Column(name="FEATURE", precision=22)
private BigDecimal feature;
#Id
#Column(name="FUNC", precision=22)
private BigDecimal func;
#Id
#Column(name="TASK", precision=22)
private BigDecimal task;
//uni-directional one-to-one association to Product
#OneToOne(cascade=ALL, mappedBy="permission")
private Product productObj;
#OneToOne(cascade=ALL, mappedBy="permission")
private Feature featureObj;
#OneToOne(cascade=ALL, mappedBy="permission")
private Function functionObj;
#OneToOne(cascade=ALL, mappedBy="permission")
private Task taskObj;
#ManyToOne(optional = false, fetch = FetchType.LAZY)
#JoinColumns({
#JoinColumn(name="USER_ID", referencedColumnName="USER_ID"),
#JoinColumn(name="COMPANY", referencedColumnName="COMPANY")
})
private User user;
public Permission() {
}
public String getAuth() {
return this.auth;
}
public void setAuth(String auth) {
this.auth = auth;
}
public String getCompany() {
return this.company;
}
public void setCompany(String company) {
this.company = company;
}
public String getPermDesc() {
return this.permDesc;
}
public void setPermDesc(String permDesc) {
this.permDesc = permDesc;
}
public String getUserId() {
return this.userId;
}
public void setUserId(String userId) {
this.userId = userId;
}
public BigDecimal getProdId() {
return prodId;
}
public void setProdId(BigDecimal prodId) {
this.prodId = prodId;
}
public BigDecimal getFeature() {
return this.feature;
}
public void setFeature(BigDecimal feature) {
this.feature = feature;
}
public BigDecimal getFunc() {
return func;
}
public void setFunc(BigDecimal func) {
this.func = func;
}
public BigDecimal getTask() {
return task;
}
public void setTask(BigDecimal task) {
this.task = task;
}
public Product getProductObj() {
return this.productObj;
}
public void setProductObj(Product productObj) {
this.productObj = productObj;
}
public Feature getFeatureObj() {
return this.featureObj;
}
public void setFeatureObj(Feature featureObj) {
this.featureObj = featureObj;
}
public Function getFunctionObj() {
return this.functionObj;
}
public void setFunctionObj(Function functionObj) {
this.functionObj = functionObj;
}
public User getUser() {
return this.user;
}
public void setUser(User user) {
this.user = user;
}
public Task getTaskObj() {
return this.taskObj;
}
public void setTaskObj(Task taskObj) {
this.taskObj = taskObj;
}
}