Sunday, November 16, 2008

Read parts of my book on Google Books

I just found out that parts of my book (fragments ranging from page 224 to page 374) has been scanned and available online.

The entire section on running Groovy in the database is available.

Enjoy!

22 comments:

IBM Lenovo Laptop Parts said...

kuassi,
i want to start off this blog by saying ur book was very interesting. I read it from cover to cover in one sitting. keep on the great work!!!

Jaromir D.B. Nemec said...

Hi Kuassi,
I found the chapter on running Groovy Scripts in the database very useful. Unfortunately I encounter some additional issues with java security using current release 1.5.7. I write the experience down ad post it on www.db-nemec.com/groovy/Running_Groovy_Scripts_in_the_Database.html. I’d enjoy if you could review it and possible propose some better solution how to deal with the security exceptions.
I general I thing that Groovy can be very handy in Oracle database especially for leveraging templates and builder – I add some basic examples in my post.

Great book that save me lot of time!

Regards,

Jaromir D.B. Nemec

Kuassi Mensah said...

Hi Jaromir,

Kudos for experimenting Groovy in the database.
It look like the root cause is that the Permission
(java.lang.RuntimePermission accessDeclaredMembers) has not been granted to /appl/home/oracle/groovy/groovy-all-1.5.7.jar.
Can you:
1) grant the permission (look for this article http://www.oracle.com/technology/oramag/oracle/03-jul/o43devjvm.html)
2) replace
SQL> select dbms_java.runjava ()
by
SQL>set serveroutput on
SQL>call dbms_output.put_line(dbms_java.runjava(...));

Kuassi

Jaromir D.B. Nemec said...

Hi Kuassi,
Thanks for the valuable comments. I add the privilege as proposed
exec dbms_java.grant_permission( 'GROOVY', 'SYS:java.lang.RuntimePermission', 'accessDeclaredMembers', 'file:/appl/home/oracle/groovy/groovy-all-1.5.7.jar' );

Unfortunately I got a java.lang.ExceptionInInitializerError running dbms_output.put_line(dbms_java.runjava(...)); with GROOVY user
Connected with SYS was the run OK.

This is not really a problem as I see much more perspective the way of loading the groovy jar in DB and running the scripts using TestGroovyShell – as you proposed in your book. This works, the only problem still is the required manipulation of the SecurityManager to be able to pass the security checks.

My current problems are:

1) I’m not able to javaload the groovy all jar successfully. Even using –genmissing the load fails with some ORA-29534: referenced object xxx could not be resolved.
The problem is that some referenced classes that are missing in the jar are not generated. Actually I manage a successful complete load once, but I can’t repeat it. Are there some hidden parameters such a classpath, resolver, priviledes etc. that can influence the result?

2) I’m not able to dump the loaded classes. This will at least workaround the problem 1 and speed up the installation. I found three possibilities of class dumping in your book but neither works for me in 11.1.0.6.

Despite those problems it works and I complete some promising examples. There are some home works still to be done such a support for CLOB – I crashed on a VARCHAR2 boundary while generating a script for a long partitioned table.

Regards,

Jaromir D.B. Nemec

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Inspection of Work said...

I found the chapter on running Groovy Scripts in the database very useful. Unfortunately I encounter some additional issues with java security using current release 1.5.7.

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Kudos for experimenting Groovy in the database.

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Despite those problems it works and I complete some promising examples. There are some home works still to be done such a support for CLOB – I crashed on a VARCHAR2 boundary while generating a script for a long partitioned table.

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This works, the only problem still is the required manipulation of the SecurityManager to be able to pass the security checks.

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