[jira] [Commented] (DERBY-7097) Update documentation to allow users to properly use EmbeddedDriver

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[jira] [Commented] (DERBY-7097) Update documentation to allow users to properly use EmbeddedDriver

Richard N. Hillegas (Jira)

    [ https://issues.apache.org/jira/browse/DERBY-7097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17267410#comment-17267410 ]

Daniel Le Berre commented on DERBY-7097:

Since the EmbeddedDriver class is located in the derbytools.jar, if that jar is not located in the classpath, the Autoloaded procedure will fail with a ClassNotFoundException (which is what happened to me).

This is exactly what I guess that the fact that the EmbeddedDriver class moved to derbytools.jar is a mistake, it was not meant to be that way.


> Update documentation to allow users to properly use EmbeddedDriver
> ------------------------------------------------------------------
>                 Key: DERBY-7097
>                 URL: https://issues.apache.org/jira/browse/DERBY-7097
>             Project: Derby
>          Issue Type: Bug
>          Components: Documentation
>    Affects Versions:
>            Reporter: Daniel Le Berre
>            Priority: Major
>         Attachments: derby-7097-01-aa-jpms-related-website-changes.diff, derby-7097-01-ab-jpms-related-website-changes.diff, derby-7097-02-aa-releaseSummary.diff, derby-7097-03-aa-embeddedDemo.diff
> In earlier version of Derby, and as reported in the documentation, the EmbeddedDriver class was in derby.jar.
> As such, it was quite easy to deploy a webapp with an embedded derby database: it was sufficient to just add a derby.jar file to the project library.
> In current releases of derby (, the EmbeddedDriver class is no longer in the derby.jar file but in the derbytools.jar file.
> ```
> $ for i in `ls *.jar`; do echo $i ; jar tf $i | grep Driver ; done
>  derby.jar
>  org/apache/derby/iapi/jdbc/AutoloadedDriver$1.class
>  org/apache/derby/iapi/jdbc/AutoloadedDriver.class
>  org/apache/derby/iapi/jdbc/Driver42.class
>  org/apache/derby/iapi/jdbc/InternalDriver$1.class
>  org/apache/derby/iapi/jdbc/InternalDriver$2.class
>  org/apache/derby/iapi/jdbc/InternalDriver$3.class
>  org/apache/derby/iapi/jdbc/InternalDriver$4.class
>  org/apache/derby/iapi/jdbc/InternalDriver$5.class
>  org/apache/derby/iapi/jdbc/InternalDriver$DaemonThreadFactory.class
>  org/apache/derby/iapi/jdbc/InternalDriver$LoginCallable.class
>  org/apache/derby/iapi/jdbc/InternalDriver.class
>  META-INF/services/java.sql.Driver
>  derbyLocale_cs.jar
>  derbyLocale_de_DE.jar
>  derbyLocale_es.jar
>  derbyLocale_fr.jar
>  derbyLocale_hu.jar
>  derbyLocale_it.jar
>  derbyLocale_ja_JP.jar
>  derbyLocale_ko_KR.jar
>  derbyLocale_pl.jar
>  derbyLocale_pt_BR.jar
>  derbyLocale_ru.jar
>  derbyLocale_zh_CN.jar
>  derbyLocale_zh_TW.jar
>  derbyclient.jar
>  org/apache/derby/client/ClientAutoloadedDriver.class
>  META-INF/services/java.sql.Driver
>  derbynet.jar
>  derbyoptionaltools.jar
>  derbyrun.jar
>  derbyshared.jar
>  derbytools.jar
>  org/apache/derby/jdbc/ClientDriver.class
>  org/apache/derby/jdbc/ClientDriver40.class
>  org/apache/derby/jdbc/EmbeddedDriver.class
> ```
> As such, most of the tutorials found on the internet about "how to use derby in embedded mode" are just wrong because they simply mention derby.jar as a dependency.
> Worst, derby own documentation is not up to date: as such, I had no way to understand why new releases of this tool that I have been using for more than a decade in the classroom suddenly did not work anymore.
> The explanation is finally simple: I just wonder how such impacting decision could be done without proper documentation.
> I am also surprised to be the first one reporting this, since the problem exists since at least a year.
> There are two possible fix to this issue:
>  * move back the EmbeddedDriver class to derby.jar (my favorite option I would say), but I guess there is a good reason for moving those classes to derbytools.jar
>  * update the documentation on Derby's web site, with a quite visible alert about this change.
> I have been a pretty happy user of derby for years, and will certainly be in the future. Thanks for that great tool. However, that breaking change has been particularly annoying, which is the reason of that bug report.

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