Persistence Error in Netbeans "Building a Java Desktop Database Application" Tut

[igillespie]

When doing the following two tutorials using NetBeans 6.5 and TopLink in a Windows Vista environment...

http://www.netbeans.org/kb/docs/java/gui-db.html

http://www.netbeans.org/kb/docs/java/gui-db-custom.html

...I get the following errors immediately at run time:

[Grover Blue]

You need to add a persistence unit to your class. Right click on the
project and add a new one. Name it car_databasePU

On 2/6/09, igillespie <address-removed> wrote:

[igillespie]

It doesn't say that one needs to do that in the tutorial, but I've just tried it. Here's what happens.

I right-click on my project in the NetBeans "Projects" windows and select "New" | "Other...". Then, in the "New File" window, I select "Persistence" from the "Categories" menu and then "Persistence Unit" from the "File Types" window. I then click next.

On the next screen I type in car_databasePU as the "Persistence Unit Name" and then the "Finish" button at the bottom of the wondow is greyed out and I get a warning message just above that says "the name of the persistence unit must be unique".

This is a little odd since there's no persistence unit file in the existing project (as generated by NetBeans as part of the tutorial), but--in addition to car_databasePU being mentioned twice in the persistence.xml file--there is a line in another file--CarsView.properties--with the line "entityManager.persistenceUnit=car_databasePU". I don't really know what this means given that this is all part of the code generated automatically by NetBeans, but I hope it helps.

In any event, I doubt this is the problem as one doesn't have to create a perisistence unit file as part of the tutorial. All of that seems to be handled automatically.

[giorgio42]

I don't know exactly what is going on inside Toplink here, but from the exception I assume that it searches the list of jars in the class path for persistence archives. During this process it runs into a path that violates the URI specification. You can easily evoke this exception by passing an URI similar to "file://foo/bar/baz.txt" to File(URI uri).

This may be a bug in Toplink, but you could at least check your class path (*not* the environment variable) for unorthodox looking entries?

Georg


2009/2/6 Grover Blue <address-removed ([email]address-removed[/email])>

[pointer2null]

there seems to be a lot of bug in the whole database/binding setup with netbeans. I've been trying for two days to get an embedded database working with no luck at all. I have managed to get the simplist tutorial to work, but if you try and add anything exciting like an auto increment primary key or an embedded database you run into problems.

you say your error is that the persistance manager needs a unique name, but there is not Pm in the project - I think this sounds like *yet* another netbeans bug - try closing netbeans and delete the build and dist folders from the project then restart netbeans. I had a similar case where an entity bean in the project had member values that didn't exist even though I had deleted the old one and made a new one - netbeans seemed not to have updated.

If you find the solution please post it as I'm sure we're not the only people having problems with this.

[igillespie]

I've solved this the problem.

It looks like NetBeans/the compiler/the JVM could not find the persistence.xml file because it was stored on a network drive under the new Vista setup at my office.

I don't know why this would be a problem, but most people where I work don't do any kind of development/technical work so the privileges under the new Vista regime are very restrictive and it doesn't entirely surprise me that they would cause headaches.

Chalk another one up for Microsoft!

[Melongo Annabel]

Please file this issue at: http://www.netbeans.org/community/issues.html

Thanks.


From: pointer2null <address-removed>
To: address-removed
Sent: Wednesday, February 11, 2009 6:22:40 AM
Subject: [nbusers] Persistence Error in Netbeans "Building a Java Desktop Database Application" Tut

there seems to be a lot of bug in the whole database/binding setup with netbeans. I've been trying for two days to get an embedded database working with no luck at all. I have managed to get the simplist tutorial to work, but if you try and add anything exciting like an auto increment primary key or an embedded database you run into problems.



you say your error is that the persistance manager needs a unique name, but there is not Pm in the project - I think this sounds like *yet* another netbeans bug - try closing netbeans and delete the build and dist folders from the project then restart netbeans. I had a similar case where an entity bean in the project had member values that didn't exist even though I had deleted the old one and made a new one - netbeans seemed not to have updated.



If you find the solution please post it as I'm sure we're not the only people having problems with this.

[thompsonwd40]

If you use Oracle, you need to set up an autoincrement trigger, I will post the solution if this applies to you.
Best,
David


----- Original Message -----
From: "Melongo Annabel" <address-removed>
To: address-removed
Sent: Wednesday, February 11, 2009 10:58:31 AM GMT -07:00 US/Canada Mountain
Subject: Re: [nbusers] Persistence Error in Netbeans "Building a Java Desktop Database Application" Tut

Please file this issue at: http://www.netbeans.org/community/issues.html

Thanks.


From: pointer2null <address-removed>
To: address-removed
Sent: Wednesday, February 11, 2009 6:22:40 AM
Subject: [nbusers] Persistence Error in Netbeans "Building a Java Desktop Database Application" Tut

there seems to be a lot of bug in the whole database/binding setup with netbeans. I've been trying for two days to get an embedded database working with no luck at all. I have managed to get the simplist tutorial to work, but if you try and add anything exciting like an auto increment primary key or an embedded database you run into problems.



you say your error is that the persistance manager needs a unique name, but there is not Pm in the project - I think this sounds like *yet* another netbeans bug - try closing netbeans and delete the build and dist folders from the project then restart netbeans. I had a similar case where an entity bean in the project had member values that didn't exist even though I had deleted the old one and made a new one - netbeans seemed not to have updated.



If you find the solution please post it as I'm sure we're not the only people having problems with this.

[JLNavas]

Hi, I have the same problem, my pc runs Vista. I think that I´ve worked it out just changing the project directory.
I started again, but this time creating the project in a simple directory ("c:\testproject") and all has run Ok.

[hantsy]

JLNavas wrote:

[Manfred Riem]

This is a probably bug in the persistence provider (are you using TopLink
Essentials)?

[fuddy]

I also had this same problem.
However, I have found a solution that works for me.

Mine is a Derby ( also known as JavaDB for some strange reason ) database.

My problem was in the definition of the "Database Location" in the JAVADB properties.

While Netbeans was perfectly happy with the way I had set it up, in that it allowed me to access the database using NetBeans itself, the application did not build - it gave the oracle.toplink.essentials.exceptions.PersistenceUnitLoadingException and related errors.

So, I shut the database connection and server down
Created a new directory ( D:\Java\Databases )
Moved my database's directory into that new one.
Amended the "Database Location" in JAVADB Properties to D:\Java\Databases
Restarted the server, connected to the database, dropped and rebuilt the Database GUI

All worked fine.

Note sure if this will help all, but it might help some.

[alexgr]

I had this problem too. After a couple of brain aneurysms, I figured out that the problem was that the Project Location folder path included non-latin characters.

I use windows in greek, which means that the default NetBeans Project Location is "C:\Documents and Settings\User\Τα έγγραφά μου\NetBeansProjects". Changing the location to something that includes only Latin characters solved the problem...

From what I see this is a bug supposedly resolved, but apparently it is not, as I used the very latest versions of all programs involved.

[rdg_software]

I got the same problem. Two days of work but no result.
Tried Hibernate, Eclipselink but the same problem happen.
The EntityManager can't find the persistence library unit or the persistence.xml file. I don't know.

[Edson Richter]

Em 16/02/2013 17:38, rdg_software escreveu: