NotFilter doesn't have equals/hashCode implementation
Hi Guys,
I'm using 3.4.2/411 and NotFilter doesn't have an equals/hashCode implementation - this means that it doesn't get properly removed when you unregister a listener/CQC.
It's easy to work around by extending the class, but it would be nice to have a proper fix.
I'm also suspicius of InFilter...
Thanks, Paul
Thanks for your note.
This issue has been filed as COH-2586 for future reference.
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Implementation of equals, hashCode, and
I am writing an RMI application where the implementation of the remote interface cannot extend UnicastRemoteObject because it already extends another class. So, I need to explicitly export the server object using UnicastRemoteObject.exportObject(server, 0);� no problem.
Problem is I�ve read that in order to make the class behave as if it had extend UnicastRemoteObject, you must provide implementations for equals, hashCode, and toString. I�ve searched the world over for implementations of these methods equivalent to those found in UnicastRemoteObject� no luck so far.
Could you help me out?
I�ve found some code that I�ve listed below� Is it equivalent to the equals and hashCode method found in UnicastRemoteObject? What about toString()?
public class RemoteDataServer extends LocalDataServer implements RemoteInterface{
private Remote serverStub;
public RemoteDataServer() throws IOException {
super();
//export remote object
serverStub = UnicastRemoteObject.exportObject(this);
public boolean equals(Object obj) {
return (obj == this || serverStub.equals(obj));
public int hashCode() {
return serverStub.hashCode();
//toString()???Hi,
At book Effective Java by Joshua Bloch you can see some info
overriding these members.
See at http://java.sun.com/docs/books/effective/index.html
Here is the toString()spec method from Object :
Returns a string representation of the object. In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.
The toString method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:
getClass().getName() + '@' + Integer.toHexString(hashCode())
but toString from class String simply returns the string contents of
an object.
Hope this help -
Field 'record_EMP_ID' doesn't have a default value
I solved org.hibernate.TransientObjectException by adding "@OneToMany(fetch=FetchType.EAGER, cascade=CascadeType.ALL)"
But this time values can't be inserted to DB.
OS : Windows 7
JDK : JDK 1.6
JBoss : JBoss 5.1.0.GA
DB : MySQL 5.5
Error is "Field 'record_EMP_ID' doesn't have a default value"
- Members.java
@Entity
@Table(name = "family")
public class Members implements Serializable {
@Id
@Column(name = "EMP_ID")
private String id ;
@Column(name = "EMP_Passwd")
private String passwd ;
@Column(name = "EMP_Name")
private String name ;
@OneToMany(fetch=FetchType.EAGER, cascade=CascadeType.ALL)
@JoinTable(name="info", joinColumns = {@JoinColumn(name = "EMP_Name")})
private Collection<Records> record = new ArrayList();
....getter and setter
- Records.java
@Entity
@Table(name = "info")
public class Records implements Serializable {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name = "EMP_ID")
private int i;
@Column(name = "EMP_Name")
private String name;
@Column(name = "EMP_Bank_Account")
private String account;
@Column(name = "EMP_Hobby")
private String hobby;
@Column(name = "EMP_Phone")
private int phone;
...getter and setter method
in jsp file I invoke EntityManager.persist
Context ctx = new InitialContext();
IMappingTestPort port = (IMappingTestPort) ctx.lookup("MappingTestBean/remote");
Records r = new Records();
r.setName("aaa");
r.setAccount("111-2222");
r.setHobby("bbb");
r.setPhone(021112222);
Members m = new Members();
m.setId("aupres");
m.setPasswd("aaa");
m.setName("ccc");
m.getRecord().add(r);
port.setFamilyMember(m); // This EntityManager.persist method
But it failed.
In console
20:21:29,233 INFO [STDOUT] Hibernate: insert into family (EMP_Name, EMP_Passwd, EMP_ID) values (?, ?, ?)
20:21:29,268 INFO [STDOUT] Hibernate: insert into info (EMP_Bank_Account, EMP_Hobby, EMP_Name, EMP_Phone) values (?, ?, ?, ?)
20:21:29,288 WARN [JDBCExceptionReporter] SQL Error: 1364, SQLState: HY000
20:21:29,288 ERROR [JDBCExceptionReporter] Field 'record_EMP_ID' doesn't have a default value
record_EMP_ID is automatically generated by hibernate
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your computer is NOT a storage device
clear cut case
You need to change the premise of your SSD use.
see here:
Your Solid State Drive and having enough space inside your Macbook Air & Pro
Solid State Drive usage premise, or the “more space / upgrade SSD” question
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A Professional Example
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Professionals who create and import very large amounts of data have almost no change in the available space on their notebooks internal SSD because they are constantly archiving data to arrays of external or networked HD.
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Slim USB3 1TB external hard drive
External Hard Drives
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While ever changing in price, typical portable 2.5” external hard drives in USB3 run roughly $65 for 1TB or $120 for 2TB small portable USB3 hard drives. Such drives range in thickness between 5mm and 15mm, with recent improvements in storage of 500GB drives in 5mm profiles.
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Method "equals" not implemented for class "Pan1"
Method "equals" not implemented for class "Pan1" -- this is the error I'm getting while running one static Analyzer. Can anybody say, what is this error , and how to rectify it ?
The static analyzer may have noticed that either you may invoke .equals() on instances of this class (possibly through polymorphism) and you have not implemented the method in your class. This is most likely a warning since many times lack of an implemented .equals() method in such cicumstances will lead to Object.equals() being executed and that simply checks to see if the object references are the same - quite a bit stronger than what one would probably expect from .equals();
it is also possible that you did implement an equals() method but that you used the wrong argument type. This is a common mistake:
public boolean equals(MyClass other) {
return /* something */;
}This type of warning may be ignored, or if it troubles you and there is no way to disable it for the classes that you know you have implemented correctly, you might consider adding an equals method of the form:
public boolean equals(Object other) {
return super.equals(other);
}Chuck -
Hi all,
I am studying the hash code implementation of java. And from the source code of java.lang.Object class, I have found that the actual implementation of it is in the native codes. But, I can not find the native source code which corresponds to that. (I am using linux, btw) And in the documentation it simply says the hash code is generated simply mapping the object address to an integer value. So, could you please enlighten me about its implementation? algorithms? or source code ?
thanks in advanceMurat wrote:
Hi all,
I am studying the hash code implementation of java. And from the source code of java.lang.Object class, I have found that the actual implementation of it is in the native codes. But, I can not find the native source code which corresponds to that. (I am using linux, btw) And in the documentation it simply says the hash code is generated simply mapping the object address to an integer value. So, could you please enlighten me about its implementation? algorithms? or source code ?
thanks in advanceYou shouldn't look at java.lang.Object 's hashCode() implementation as a reference.
Have a look at this article:
http://www.ibm.com/developerworks/java/library/j-jtp05273.html -
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The first is my Order table which has a single row for each unique order - there are no duplicate order numbers.The order id column here is called
OrderID.
The second is my Submissions table which is similar to a transactions table, there are multiple submissions for every order. This table also contains an
OrderID column that contains the relevant OrderID.
The submission table also contains a calculated field called Date and a calculated field called
MaxDate field which is the date of the most recent submission that relates to any particular order in cases where there are multipple.
My goal is to add a column to the Order table this MaxDate column. The reason for duplicating the information rather than linking the tables is because I need to create more calculated columns in the
Orders table based on this value.
I have created a relationship between the two tables however when I use:
=RELATED(Submissions[MaxDate]
I get this error:
"...either doesn't exist or doesn't have a relationship to any table available in the current context"
I don't really understand why this would be, because MaxDate definitely exists and contains only numerical values. What is more strange is that if I try and combine the data through a pivot table it actually works! I can create a pivot with OrderID in the first
column and then associate it with MaxDate from the Submissions
table as the value.
Can anyone help me understand what is the problem here?
P.S. if it is useful the formula I'm using to calculate the MaxDate is:
=MAXX(FILTER(Submissions,Submissions[OrderID] = EARLIER(Submissions[OrderID])),[Date])
Thanks.Maracles, is this still an issue?
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