dblook fails with client if derby.jar is not in classpath with java.sql.SQLException: Error marshalling or unmarshalling a user defined type

With Derby 10.6 and higher, dblook fails if derby.jar is not in the classpath because of DERBY-4688. It cannot execute the queries against the system catalogs that have UDT's. Users can work around this issue by adding derby.jar to the classpath before running dblook.

This could be fixed in dblook by casting UDT fields in its queries to long varchar, per the release note attached to DERBY-4688.

To reproduce.
Start network server
java org.apache.derby.drda.NetworkServerControl start

In another window set classpath to contain only derbyclient.jar and derbytools.jar but not derby.jar

e.g.
export CLASSPATH=".;C:/cygwin/svn2/trunk/jars/sane/derbyclient.jar;C:/cygwin/svn2/trunk/jars/sane/derbytools.jar"

Create a database with ij
java org.apache.derby.tools.ij

ij version 10.10
ij> connect 'jdbc:derby://localhost:1527/wombat;create=true';
ij> create table mytab (i int);
0 rows inserted/updated/deleted
ij> insert into mytab values(1);
1 row inserted/updated/deleted
ij> exit;

run dblook

java org.apache.derby.tools.dblook -d 'jdbc:derby://localhost:1527/wombat'

The output is:
– Timestamp: 2012-07-10 11:08:36.829
– Source database is: wombat
– Connection URL is: jdbc:derby://localhost:1527/wombat
– appendLogs: false

– ----------------------------------------------
– DDL Statements for tables
– ----------------------------------------------

CREATE TABLE "APP"."MYTAB" (-- Note: At least one unexpected error/warning message was
– encountered during DDL generation. See dblook.log
– to review the message(s).

The dblook.log contains
~/repro/dblookclient $cat dblook.log
java.sql.SQLException: Error marshalling or unmarshalling a user defined type: org.apache.derby.catalog.types.TypeDescri
ptorImpl
at org.apache.derby.client.am.SQLExceptionFactory40.getSQLException(SQLExceptionFactory40.java:108)
at org.apache.derby.client.am.SqlException.getSQLException(SqlException.java:364)
at org.apache.derby.client.am.ResultSet.getString(ResultSet.java:1079)
at org.apache.derby.impl.tools.dblook.DB_Table.createColumn(DB_Table.java:151)
at org.apache.derby.impl.tools.dblook.DB_Table.doTables(DB_Table.java:104)
at org.apache.derby.tools.dblook.go(dblook.java:538)
at org.apache.derby.tools.dblook.<init>(dblook.java:142)
at org.apache.derby.tools.dblook.main(dblook.java:97)
Caused by: org.apache.derby.client.am.SqlException: Error marshalling or unmarshalling a user defined type: org.apache.d
erby.catalog.types.TypeDescriptorImpl
at org.apache.derby.client.am.SqlException.<init>(SqlException.java:167)
at org.apache.derby.client.am.SqlException.<init>(SqlException.java:231)
at org.apache.derby.client.am.Cursor.get_UDT(Cursor.java:651)
at org.apache.derby.client.am.Cursor.getString(Cursor.java:1059)
at org.apache.derby.client.am.ResultSet.getString(ResultSet.java:1069)
... 5 more
Caused by: java.lang.ClassNotFoundException: org.apache.derby.catalog.types.TypeDescriptorImpl
at java.lang.Class.forName(Class.java:174)
at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:636)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1607)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1528)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1764)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1361)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:383)
at org.apache.derby.client.am.Cursor.get_UDT(Cursor.java:647)
... 7 more
– **--> DEBUG: Error marshalling or unmarshalling a user defined type: org.apache.derby.catalog.types.TypeDescriptorImp
l