Troubleshooting

[Javaid Culasy]

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Hi,

 

I have a management application which uses embedded Derby database. It has been working well until now. Now when we start the Application it hangs when initialising the Database. When I look in the control panel add or remove program window it dose not show me any “Java” programs. Dose Derby Database need java before it works and in the derby.log file most of the says “unknown” I would much appreciate some one help.

 

Javaid Culasy

 

Senior Customer Service Engineer

 

KCOM Gruop

Technology House

Maylands Avenue

Hemel Hempstead

Herts

HP2 7DF

 

 

 

 

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[Andrew Bruno]

Hi Javaid,

Its a little difficult to understand the problem.

if I understand correctly, are you asking whether the application you are running requires Java?

Its possible that Java/JRE was embedded in the management app or was an external app, and was removed, or your %PATH% no longer has Java/bin??

Can you provide more info?

Cheers
Andrew

On Wed, Sep 23, 2009 at 6:07 AM, Javaid Culasy <Javaid.Culasy@...> wrote:

Hi,

 

I have a management application which uses embedded Derby database. It has been working well until now. Now when we start the Application it hangs when initialising the Database. When I look in the control panel add or remove program window it dose not show me any “Java” programs. Dose Derby Database need java before it works and in the derby.log file most of the says “unknown” I would much appreciate some one help.

 

Javaid Culasy

 

Senior Customer Service Engineer

 

KCOM Gruop

Technology House

Maylands Avenue

Hemel Hempstead

Herts

HP2 7DF

 

 

 

 

This email has been scanned for all viruses.

Please consider the environment before printing this email.

The content of this email and any attachment is private and may be privileged. If you are not the intended recipient, any use, disclosure, copying or forwarding of this email and/or its attachments is unauthorised. If you have received this email in error please notify the sender by email and delete this message and any attachments immediately. Nothing in this email shall bind the Company or any of its subsidiaries or businesses in any contract or obligation, unless we have specifically agreed to be bound.

KCOM Group PLC is a public limited company incorporated in England and Wales, company number 02150618 and whose registered office is at 37 Carr Lane, Hull, HU1 3RE.

118288 - KCOM UK Directory Enquiries. Calls will cost no more than 49p connection + 14p per minute including VAT from a KC or BT landline. Call charges from mobiles and other networks may vary. If you are calling from a mobile you will now receive your requested number via text message. You will not be charged for the text message.

[Myrna van Lunteren]

On Tue, Sep 22, 2009 at 5:44 PM, Andrew Bruno <andrew.bruno@...> wrote:

> Hi Javaid,
>
> Its a little difficult to understand the problem.
>
> if I understand correctly, are you asking whether the application you are
> running requires Java?
>
> Its possible that Java/JRE was embedded in the management app or was an
> external app, and was removed, or your %PATH% no longer has Java/bin??
>
> Can you provide more info?
>
> Cheers
> Andrew
>
>
> On Wed, Sep 23, 2009 at 6:07 AM, Javaid Culasy <Javaid.Culasy@...>
> wrote:
>>
>> Hi,
>>
>>
>>
>> I have a management application which uses embedded Derby database. It has
>> been working well until now. Now when we start the Application it hangs when
>> initialising the Database. When I look in the control panel add or remove
>> program window it dose not show me any “Java” programs. Dose Derby Database
>> need java before it works and in the derby.log file most of the says
>> “unknown” I would much appreciate some one help.
>>
>>
>>
>> Javaid Culasy
>>
>>
>>
>> Senior Customer Service Engineer
>>
>>
>>
>> KCOM Gruop
>>
>> Technology House
>>
>> Maylands Avenue
>>
>> Hemel Hempstead
>>
>> Herts
>>
>> HP2 7DF
>>

It sounds like the application 'crashes' when it's trying to
initialize the database...i.e. the jvm (your 'java' process) stops for
some reason.

You said, "most of derby.log says 'unknown'". Does it say 'Unknown
Source'? If so, that likely just means you're running with normal -
not debug - derby jar files (the exact line number in the source are
unknown).
What would help us is the contents of the derby.log - any errors, and
the stack of called methods at the time of the error if it's there.

And just in case - do you have a backup of the database (i.e. a copy
of the database directory) when it was still working? Would be
interesting to see if you can get things going with that backup.

Regards,
Myrna

[Derby-3]

> -----Original Message-----
> From: Myrna van Lunteren [mailto:m.v.lunteren@...]
> Sent: Tuesday, September 22, 2009 10:02 PM
> To: Derby Discussion
> Subject: Re: Troubleshooting
>
[SNIP]

>
> It sounds like the application 'crashes' when it's trying to
> initialize the database...i.e. the jvm (your 'java' process) stops for
> some reason.
>
> You said, "most of derby.log says 'unknown'". Does it say 'Unknown
> Source'? If so, that likely just means you're running with normal -
> not debug - derby jar files (the exact line number in the source are
> unknown).
> What would help us is the contents of the derby.log - any errors, and
> the stack of called methods at the time of the error if it's there.
>
> And just in case - do you have a backup of the database (i.e. a copy
> of the database directory) when it was still working? Would be
> interesting to see if you can get things going with that backup.
>
> Regards,
> Myrna

Just out of curiosity, even if you've got an embedded Derby database within
an app, and its not set up as a networked copy, if the application is down,
couldn't you use IJ to connect to the database for debugging purposes?

This will help reduce the problem set and let you verify that the database
is 'sane' or uncorrupted.

Or am I missing something?

-Mike