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From "Rick Hillegas (JIRA)" <derby-...@db.apache.org>
Subject [jira] Updated: (DERBY-930) Add support for autoloading of Derby client drivers
Date Mon, 27 Feb 2006 22:44:55 GMT
     [ http://issues.apache.org/jira/browse/DERBY-930?page=all ]

Rick Hillegas updated DERBY-930:
--------------------------------

    Attachment: ClassloadingTest.jar

I have attached a jarred up experiment which demonstrates a SecurityManager-induced classloading
issue which results in the silent failure to autoload the jdbc driver. The autoloading logic
is using the thread context class loader to look in the classpath for all resources with the
name META-INF/services/java.sql.Driver. If you run with a SecurityManager, the thread context
class loader only finds one META-INF/services/java.sql.Driver, namely, the one in the jar
file which contains the calling code. However, if you don't run with a SecurityManager, then
the thread context class loader finds many META-INF/services/java.sql.Driver(s), one in each
jar file on the classpath.

The experiment contains the following files:

o A.jar - Jar file holding the calling program and its own META-INF/services/java.sql.Driver
o B.jar - Jar file containing another META-INF/services/java.sql.Driver
o AB.policy - Security policy for both jar files
o autoloadslim - Driving script which runs the application both with and without a SecurityManager
o AutoloadClassloader.java - The application which looks for META-INF/services/java.sql.Driver
using the thread context class loader


> Add support for autoloading of Derby client drivers
> ---------------------------------------------------
>
>          Key: DERBY-930
>          URL: http://issues.apache.org/jira/browse/DERBY-930
>      Project: Derby
>         Type: New Feature
>     Reporter: Rick Hillegas
>     Assignee: Rick Hillegas
>  Attachments: ClassloadingTest.jar, bug930.diff, bug930_problem.diff, bug930_problem2.diff
>
> Write Derby's driver names into the correct spot in derby.jar and derbyclient.jar so
that the 1.6 vm autoloads Derby drivers. Section 10.2.1 of the JDBC4 spec describes the details.

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