Syed Khurram Anwar

How to use it in the following class as foreign key?

@Entity @Table(name="configInfo") public class ConfigInfo { @Id @GeneratedValue(strategy=GenerationType.AUTO) @Column(name="id", nullable=false) private Long id; private HardwareConfiguration hardwareConfiguration; // I want help here. What annotations should be applied here? public ConfigInfo () { } public HardwareConfiguration getHardwareConfiguration () { return hardwareConfiguration; } public void setHardwareConfiguration (HardwareConfiguration val) { this.hardwareConfiguration = val; } public Long getId () { return id; } public void setId (Long val) { this.id = val; } }

Thanks. I am new to Hibernate. Would you please tell me the syntax that how will I use this key in another class as foreign key?

I read the book "Hibernate Made Easy" by Cameron. He has explained 3 ways to use embeddable class

1 - @id

2 - @IdClass

3 - @EmbeddedId

I have used the first one.

I have a class HardwareConfiguration which contains a composite primary key. I have done that using JPA Annotations. Here is the code:

@Entity @Table(name="hardwareConfiguration") public class HardwareConfiguration { @Id HardwareConfigurationPK primaryKey = new HardwareConfigurationPK(); @Column(name="description", length=100) private String description; @Column(name="frozenYN") private Boolean frozenYN; @ManyToOne(targetEntity=Machine.class) @JoinColumn(name="machineId", nullable=false) private Machine machine; @OneToMany(mappedBy="hardwareConfiguration") private Set<MachineLevelVariables> machineLevelVariables; public HardwareConfiguration () { frozenYN = Boolean.FALSE; } public String getDescription () { return description; } public void setDescription (String val) { this.description = val; } public boolean getFrozenYN () { return frozenYN; } public void setFrozenYN (boolean val) { this.frozenYN = val; } public Machine getMachine () { return machine; } public void setMachine (Machine val) { this.machine = val; } public Set<MachineLevelVariables> getMachineLevelVariables () { return machineLevelVariables; } public void setMachineLevelVariables (Set<MachineLevelVariables> val) { this.machineLevelVariables = val; } public HardwareConfigurationPK getPrimaryKey() { return primaryKey; } public void setPrimaryKey(HardwareConfigurationPK primaryKey) { this.primaryKey = primaryKey; } }

Here is the class for composite primary key:

@Embeddable public class HardwareConfigurationPK implements Serializable { private Long id; private Long version; public HardwareConfigurationPK() { } public HardwareConfigurationPK(Long id, Long version) { this.id = id; this.version = version; } public Long getId() { return id; } public void setId(Long id) { this.id = id; } public Long getVersion() { return version; } public void setVersion(Long version) { this.version = version; } @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (obj == null) { return false; } if (getClass() != obj.getClass()) { return false; } final HardwareConfigurationPK other = (HardwareConfigurationPK) obj; if (id == null) { if (other.id != null) { return false; } } else if (!id.equals(other.id)) { return false; } if (version == null) { if (other.version != null) { return false; } } else if (!version.equals(other.version)) { return false; } return true; } @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + ((id == null) ? 0 : id.hashCode()); result = prime * result + ((version == null) ? 0 : version.hashCode()); return result; } }

Now I want to use this composite primary key as a foreign key in another class. How can I do that using annotations. here is the class which is using this composite key as foreign key:

@Entity @Table(name="configInfo") public class ConfigInfo { @Id @GeneratedValue(strategy=GenerationType.AUTO) @Column(name="id", nullable=false) private Long id; private HardwareConfiguration hardwareConfiguration; // I want help here. What annotations should be applied here? public ConfigInfo () { } public HardwareConfiguration getHardwareConfiguration () { return hardwareConfiguration; } public void setHardwareConfiguration (HardwareConfiguration val) { this.hardwareConfiguration = val; } public Long getId () { return id; } public void setId (Long val) { this.id = val; } }

I am using Spring Webflow 1.0. There is only one root flow without any subflows. There are 5 pages in the flow so, 5 controllers are being used in the whole flow. When i terminate the flow with an end state, and go back to the flow again, I can see the variables set by a controller during previous flow, which are not even in any scope but they were variables of a controller which still exist even after end of the flow. What is the reason? is it a bug?