[
http://issues.apache.org/jira/browse/DERBY-668?page=comments#action_12358397 ]
Bryan Pendleton commented on DERBY-668:
---------------------------------------
The business about if (loc != null && loc.startsWith("file:") &&
loc.indexOf("!") > 0) is as follows: when we call
getResource(x.y.class).getFile(), the string that we get back looks something
like:
file://path/to/the/jar!x.y.class
so I'm just checking for a string of that format and sucking the file name out
of it.
I'll add a comment to make that more clear.
> SysInfo can give misleading information when JDBC jars are loaded from
> jre/lib/ext
> ----------------------------------------------------------------------------------
>
> Key: DERBY-668
> URL: http://issues.apache.org/jira/browse/DERBY-668
> Project: Derby
> Type: Bug
> Components: Build tools
> Versions: 10.1.1.0
> Reporter: Bryan Pendleton
> Priority: Minor
> Attachments: Derby-668.diff
>
> There is a section in the SysInfo tool's output titled "Derby Information",
> which prints location and version information for the major Derby jars. Here
> is an example of that output:
> --------- Derby Information --------
> JRE - JDBC: J2SE 1.4.2 - JDBC 3.0
> [/home/bpendleton/src/derby-subversion/trunk/jars/insane/derby.jar] 10.2.0.0
> alpha - (315052M)
> [/home/bpendleton/src/derby-subversion/trunk/jars/insane/derbytools.jar]
> 10.2.0.0 alpha - (315052M)
> [/home/bpendleton/src/derby-subversion/trunk/jars/insane/derbynet.jar]
> 10.2.0.0 alpha - (315052M)
> [/home/bpendleton/src/derby-subversion/trunk/jars/insane/derbyclient.jar]
> 10.2.0.0 alpha - (315052M)
> [/home/bpendleton/downloads/derby/db2jcc/lib/db2jcc.jar] 2.4 - (17)
> [/home/bpendleton/downloads/derby/db2jcc/lib/db2jcc_license_c.jar] 2.4 - (17)
> Unfortunately, this tool can be fooled if you arrange for one of these jar
> files to be loaded from a magic location like $JAVA_HOME/jre/lib/ext.
> For example, I had (accidentally) placed an old version of db2jcc.jar into
> $JAVA_HOME/jre/lib/ext. When I ran SysInfo, it printed out:
> --------- Derby Information --------
> JRE - JDBC: J2SE 1.4.2 - JDBC 3.0
> [/home/bpendleton/src/derby-subversion/trunk/jars/insane/derby.jar] 10.2.0.0
> alpha - (315052M)
> [/home/bpendleton/src/derby-subversion/trunk/jars/insane/derbytools.jar]
> 10.2.0.0 alpha - (315052M)
> [/home/bpendleton/src/derby-subversion/trunk/jars/insane/derbynet.jar]
> 10.2.0.0 alpha - (315052M)
> [/home/bpendleton/src/derby-subversion/trunk/jars/insane/derbyclient.jar]
> 10.2.0.0 alpha - (315052M)
> [/home/bpendleton/downloads/derby/db2jcc/lib/db2jcc.jar] 1.0 - (581)
> [/home/bpendleton/downloads/derby/db2jcc/lib/db2jcc_license_c.jar] 1.0 - (581)
> However, the "1.0 (581)" information actually came from
> $JAVA_HOME/jre/lib/ext/db2jcc.jar, NOT from
> /home/bpendleton/downloads/derby/db2jcc/lib/db2jcc.jar.
> It would be nice if SysInfo could detect the difference between a jar file
> being loaded via the application class loader using $CLASSPATH, and a jar
> file being loaded via the system class loader using JDK library extensions.
> To reproduce the problem, simply:
> 1) Place an older version of db2jcc.jar into $JAVA_HOME/jre/lib/ext
> 2) Place a newer version of db2jcc.jar into your $CLASSPATH
> 3) Run SysInfo. You will see that it prints the name of the jarfile from
> $CLASSPATH, but the version info from the JDK copy.
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