Re: Where's my Derby?

Lew <>
Sat, 03 Apr 2010 13:23:56 -0400
Tom Anderson wrote:

Derby aka JavaDB is included in JDK 1.6, right? So what's happening here:

$ java -version
java version "1.6.0_16"
Java(TM) SE Runtime Environment (build 1.6.0_16-b01)
Java HotSpot(TM) Client VM (build 14.2-b01, mixed mode, sharing)
$ javap org.apache.derby.jdbc.EmbeddedDriver
ERROR:Could not find org.apache.derby.jdbc.EmbeddedDriver

What's happening there is that you didn't include Derby in the classpath.

I have Derby, which came with the 1.6.0_18 download but had also come with my
earlier 1.6 downloads, and get the same exact result from that command that
you do. OTOH, when I command

   $ javap -classpath /opt/java/java/db/lib/derby.jar \

I get back:

public class org.apache.derby.jdbc.EmbeddedDriver extends java.lang.Object
implements java.sql.Driver{
     public org.apache.derby.jdbc.EmbeddedDriver();
     public boolean acceptsURL(java.lang.String) throws
     public java.sql.Connection connect(java.lang.String,
java.util.Properties) throws java.sql.SQLException;
     public java.sql.DriverPropertyInfo[] getPropertyInfo(java.lang.String,
java.util.Properties) throws java.sql.SQLException;
     public int getMajorVersion();
     public int getMinorVersion();
     public boolean jdbcCompliant();
     static void boot();
     static {};

Ergo I conclude you have Derby, too, and that it came with your JDK download.

Am i [sic] looking for the wrong driver class? Or do i [sic] have to include some
special jar on the classpath? I searched the entire JDK installation for

Apparently not the *entire* installation.

a mention of EmbeddedDriver, and there was none. Do i [sic] have some special
version of 1.6 which lacks Derby? I have whatever came with Eeebuntu 3,
which is basically Ubuntu 9.04.

I haven't used Derby since before 1.6, so i have no positive control for
how this should work.

Anyway, since it looked like Derby would be a separate download for me,
i [sic] went with H2 instead :).

It's too bad your reason wasn't valid, at least not based on the information
you provided here.


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