Thanks for the suggestion, Myrna. However, it's NOT Intellij Idea
that is having a problem; everything has been working perfectly in
dev. It's when I build a jar and just run under Windows that the
problem occurs. I'm getting desperate, though, so I'll try
"PROGRA~1" and/or moving the jars to somewhere else with no spaces in
the path.
------------------------------------------------------------------------
*From: *"Myrna van Lunteren" <[email protected]>
*To: *"Derby Discussion" <[email protected]>
*Sent: *Monday, August 8, 2011 5:18:17 PM
*Subject: *Re: Can't Load Embedded Driver
On Mon, Aug 8, 2011 at 1:53 PM, <[email protected]> wrote:
> That bottom level plumbing has been working perfectly for two years
in dev.
> I remember thinking it was pretty cool and developer-friendly. I had
> essentially NO trouble getting it all up and working. I have now
added the
> code to explicitly load the driver. It works fine in dev, but not
deployed
> in a jar (java.lang.ClassNotFoundException:
> org.apache.derby.jdbc.EmbeddedDriver). CLASSPATH surely would be
the usual
> suspect, but echo %CLASSPATH% yields "C:\Program
> Files\Apache\db-derby-10.8.1.2-bin\lib\derby.jar;." (derby.jar
really IS in
> that location) and java org.apache.derby.jdbc.EmbeddedDriver yields
> "Exception in thread "main" java.lang.NoSuchMethodError: main" as
Rick says
> it should. So, WTF am I doing wrong? In Unix, I would have
double-checked
> rwx permissions (maybe Intellij Idea is running as root), but I'm not as
> familiar with this stuff in Windows.
>
> ________________________________
> From: "Rick Hillegas" <[email protected]>
> To: "Derby Discussion" <[email protected]>
> Sent: Monday, August 8, 2011 3:24:09 PM
> Subject: Re: Can't Load Embedded Driver
>
> Hi Roy,
>
> Thanks for including the code snippet. As Raymond points out, you are
> not loading the driver explicitly. This should not be necessary if you
> are using Java 6 or 7. However, driver autoloading does not happen in
> Java 5 and earlier versions of Java. What version of Java are you using?
>
> Thanks,
> -Rick
>
> On 8/8/11 11:55 AM, Raymond Kroeker wrote:
>> Hi Roy,
>>
>> The fqcn, is the fully qualified class name of the driver. So in your
>> code you're using the driver manager to grab a connection; however I
>> don't see a reference to loading the driver:
>>
>>
http://db.apache.org/derby/papers/DerbyTut/embedded_intro.html#embedded_driver
>>
>> Class.forName("org.apache.derby.jdbc.EmbeddedDriver").newInstance();
>>
>> Raymond
>>
>> On Mon, Aug 8, 2011 at 11:47,<[email protected]> wrote:
>>> I do not know what an "fqcn" is. I am running the latest Derby
release,
>>> 10.8.1.2. The code pasted in below works great in the dev environment
>>> (IntelliJ Idea), but the same code packaged in a jar cannot find the
>>> driver
>>> with CLASSPATH set correctly.
>>>
>>> public static Connection getConnection()
>>> {
>>> Connection c = null;
>>> try
>>> { // The connectionURL
>>> is "jdbc:derby:EMDatabase;create=true"
>>> c = DriverManager.getConnection(connectionURL);
>>> c.setAutoCommit(false);
>>> }
>>> catch (Throwable e)
>>> {
>>> log(3, "Unable to connect to " + dbName + ": " +
>>> e.getMessage());
>>> stopDBMS();
>>> System.exit(3);
>>> }
>>> return c;
>>> }
>>>
>>>
>>>
>>> ________________________________
>>>
>>> From: "Raymond Kroeker"<[email protected]>
>>>
>>> To: "Derby Discussion"<[email protected]>
>>> Sent: Monday, August 8, 2011 10:08:11 AM
>>> Subject: Re: Can't Load Embedded Driver
>>>
>>> Can you try specifying the driver as a fqcn? If that doesn't solve the
>>> issue
>>> please paste relevant code around how you load the driver and obtain a
>>> connection.
>>>
>>> Raymond
>>>
>>> On Aug 8, 2011 6:55 AM,<[email protected]> wrote:
>>>>
>>>> Rick,
>>>>
>>>>
>>>>
>>>> Thank you very much for offering your help. Apparently my
CLASSPATH is
>>>> good. I typed in "java org.apache.derby.jdbc.EmbeddedDriver" and did
>>>> indeed
>>>> get exactly the expected "Exception in thread "main"
>>>> java.lang.NoSuchMethodError: main" error message. What else could be
>>>> causing my problem?
>>>>
>>>>
>>>>
>>>> Roy
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> ----- Original Message -----
>>>>
>>>>
>>>> From: "Rick Hillegas"<[email protected]>
>>>> To: "Derby Discussion"<[email protected]>
>>>> Sent: Monday, August 8, 2011 9:00:58 AM
>>>> Subject: Re: Can't Load Embedded Driver
>>>>
>>>> On 8/7/11 9:54 AM, [email protected] wrote:
>>>>> I have been happily using Derby for two years within IntelliJ Idea,
>>>>> but have now hit a wall trying to deploy the application I
developed.
>>>>> I have tried setting the path to derby.jar on the command line
and/or
>>>>> in the CLASSPATH environment variable to no avail. The embedded
>>>>> driver doesn't load; the error message is, "No suitable driver found
>>>>> for jdbc:derby:EMDatabase;create=true". I'm under Windows XP Pro.
>>>>> Any help would be appreciated.
>>>>>
>>>>> Roy Minet
>>>>>
>>>>>
>>>> Hi Roy,
>>>>
>>>> This is almost always a CLASSPATH problem. With the same
CLASSPATH, try
>>>> the following experiment:
>>>>
>>>> java org.apache.derby.jdbc.EmbeddedDriver
>>>>
>>>> If the CLASSPATH is good, you should see this error:
>>>>
>>>> Exception in thread "main" java.lang.NoSuchMethodError: main
>>>>
>>>> Hope this helps,
>>>> -Rick
>>
>>
>
Looks like it should work. Perhaps derby/intelliJ Idea/the jvm has
trouble with the space in the classpath. I think with some tools I
have to use the 8 character DOS equivalent (e.g. Progra~1 instead of
Program Files) when I refer to directory names with spaces.
So, perhaps it's worth a quick try to see if it works if you plop
derby.jar and/or your other jar somewhere else than in the Program
Files directory (and adjust the classpath too, of course).
Myrna
