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POA cycle is detected in the object graph. This will cause infinitely deep XML
 

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  1. POA cycle is detected in the object graph. This will cause infinitely deep XML
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    <p>I have two DTO objects say A and B which are having getters and setters and are used to take data from the database. The problem is when I am calling A, B gets called and B again points itself to A and a cycle is created. </p> <p>I cannot ignore/hide the method which is creating the cycle. I need to take the whole data of A and B.</p> <p>Is there any way to achieve it ?</p> <p>Please help</p> <p>This is my code which is causing the problem. This is application DTO which is calling environment DTO</p> <pre><code>@OneToMany(mappedBy="application", fetch=FetchType.LAZY ,cascade=CascadeType.ALL ) public Set&lt;EnvironmentDTO&gt; getEnvironment() { return environment; } public void setEnvironment(Set&lt;EnvironmentDTO&gt; environment) { this.environment = environment; } </code></pre> <p>And this is environment DTO which is calling the application DTO</p> <pre><code>@ManyToOne(targetEntity=ApplicationDTO.class ) @JoinColumn(name="fk_application_Id") public ApplicationDTO getApplication() { return application; } public void setApplication(ApplicationDTO application) { this.application = application; } </code></pre> <p>Here cycle is getting created</p> <p>This is my rest call which will give result in XML format and I think while creating XML cycle is getting created</p> <pre><code>@GET @Path("/get") @Produces({MediaType.APPLICATION_XML}) public List&lt;ApplicationDTO&gt; getAllApplications(){ List&lt;ApplicationDTO&gt; allApplication = applicationService.getAllApplication(); return allApplication; } </code></pre> <p>This is the Application DTO class</p> <pre><code>@Entity @Table(name="application") @org.hibernate.annotations.GenericGenerator( name ="test-increment-strategy",strategy = "increment") @XmlRootElement public class ApplicationDTO implements Serializable { @XmlAttribute public Long appTypeId; private static final long serialVersionUID = -8027722210927935073L; private Long applicationId; private String applicationName; private ApplicationTypeDTO applicationType; private String applicationDescription; private Integer owner; private Integer createdBy; private Integer assignedTo; private Date createTime; private Date modifiedTime; private Set&lt;EnvironmentDTO&gt; environment; @Id @GeneratedValue(generator = "test-increment-strategy") @Column(name = "applicationId") public Long getApplicationId() { return applicationId; } private void setApplicationId(Long applicationId) { this.applicationId = applicationId; } @Column(name = "applicationName") public String getApplicationName() { return applicationName; } public void setApplicationName(String applicationName) { this.applicationName = applicationName; } @ManyToOne(targetEntity=ApplicationTypeDTO.class ,fetch = FetchType.LAZY ) @JoinColumn(name="applicationType") public ApplicationTypeDTO getApplicationType() { return applicationType; } public void setApplicationType(ApplicationTypeDTO applicationType) { this.applicationType = applicationType; } @Column(name = "description") public String getApplicationDescription() { return applicationDescription; } public void setApplicationDescription(String applicationDescription) { this.applicationDescription = applicationDescription; } @Column(name = "owner") public Integer getOwner() { return owner; } public void setOwner(Integer owner) { this.owner = owner; } @Column(name = "createdBy") public Integer getCreatedBy() { return createdBy; } public void setCreatedBy(Integer createdBy) { this.createdBy = createdBy; } @Column(name = "assignedTo") public Integer getAssignedTo() { return assignedTo; } public void setAssignedTo(Integer assignedTo) { this.assignedTo = assignedTo; } @Column(name = "createTime") public Date getCreateTime() { return createTime; } public void setCreateTime(Date createTime) { this.createTime = createTime; } @Column(name = "modifiedTime") public Date getModifiedTime() { return modifiedTime; } public void setModifiedTime(Date modifiedTime) { this.modifiedTime = modifiedTime; } @OneToMany(mappedBy="application", fetch=FetchType.LAZY ,cascade=CascadeType.ALL ) public Set&lt;EnvironmentDTO&gt; getEnvironment() { return environment; } public void setEnvironment(Set&lt;EnvironmentDTO&gt; environment) { this.environment = environment; } </code></pre> <p>This is the Environment DTO class</p> <pre><code>@Entity @Table(name="environment") @org.hibernate.annotations.GenericGenerator( name = "test-increment-strategy", strategy = "increment") @XmlRootElement public class EnvironmentDTO implements Serializable { @XmlAttribute public Long envTypeId; @XmlAttribute public Long appId; private static final long serialVersionUID = -2756426996796369998L; private Long environmentId; private String environmentName; private EnvironmentTypeDTO environmentType; private Integer owner; private Date createTime; private Set&lt;InstanceDTO&gt; instances; private ApplicationDTO application; @Id @GeneratedValue(generator = "test-increment-strategy") @Column(name = "envId") public Long getEnvironmentId() { return environmentId; } private void setEnvironmentId(Long environmentId) { this.environmentId = environmentId; } @Column(name = "envName") public String getEnvironmentName() { return environmentName; } public void setEnvironmentName(String environmentName) { this.environmentName = environmentName; } @ManyToOne(targetEntity=EnvironmentTypeDTO.class) @JoinColumn(name = "envType") public EnvironmentTypeDTO getEnvironmentType() { return environmentType; } public void setEnvironmentType(EnvironmentTypeDTO environmentType) { this.environmentType = environmentType; } @Column(name = "owner") public Integer getOwner() { return owner; } public void setOwner(Integer owner) { this.owner = owner; } @Temporal(TemporalType.DATE) @Column(name = "createTime") public Date getCreateTime() { return createTime; } public void setCreateTime(Date createTime) { this.createTime = createTime; } @OneToMany(mappedBy="environment", cascade=CascadeType.ALL, fetch = FetchType.EAGER) public Set&lt;InstanceDTO&gt; getInstances() { return instances; } public void setInstances(Set&lt;InstanceDTO&gt; instances) { this.instances = instances; } @ManyToOne(targetEntity=ApplicationDTO.class ) @JoinColumn(name="fk_application_Id") //@XmlTransient public ApplicationDTO getApplication() { return application; } public void setApplication(ApplicationDTO application) { this.application = application; } </code></pre>
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    1. COYour title says "This will cause infinitely deep XML", but your question says nothing about XML. You mention the existence of cycles, but say nothing about why cycles are a problem. What are you actually trying to do with these objects?
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    2. COI am using restful web services to get data from the database and show it in XML format in the frontend
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