[kepler-dev] Kepler won't start for me...

[Matt Jones]

We've encountered this DB lock problem before.  Its not related to the 
tree, but to the underlying database for data access.  I think Jing 
might be able to clarify the details, but try killing all kepler 
processes and then deleting the hsqldb.lck file and starting up Kepler.

I agree the startup sequence is a problem.  I'm hoping that we can 
eliminate the need to load every actor upon startup (or even upon 
opening a tree node) by using a proxy object in the tree that represents 
just some metadata about the actor.  Only upon DnD onto the canvas would 
the actor be instantiated.  This should help tremendously with startup 
time and initial reliability (of course at the expense of not seeing the 
errors until someone tries to use an actor).

Matt

Christopher Brooks wrote:
> Yep, you probably have two keplers running.
> There is an open bug for this problem.
> 
> There is also an open bug for the start up speed issue.
> 
> _C
> --------
> 
>     
>     Kepler won't start for me... I get the following
>     exception (BTW, this sort of experience has convinced me that
>     this idea of loading all the actors at startup time was a really
>     bad idea, and in fact could ultimately make Kepler unusable...
>     Can I talk you into going back to the Ptolemy II model of loading
>     actors only when the libraries are opened?).
>     
>     Any suggestions for starting Kepler?  I tried deleting the lock
>     file, but the OS won't let me, telling me some other application
>     is using it.  I suspect the other application is Kepler, left
>     over from a previous failed attempt to start it...
>     
>     Edward
>     
>     Caused by: java.sql.SQLException: The database is already in use by 
>     another process: org.hsqldb.NIOLockFile at c06705ff[file =C:\Documents 
>     and Settings\eal\.kepler\cache\cachedata\hsqldb.lck, exists=true, 
>     locked=false, valid=false, fl =null]: java.lang.Exception: The 
>     process cannot access the file because another process has locked a 
>     portion of the file : C:\Documents and 
>     Settings\eal\.kepler\cache\cachedata\hsqldb.lck
>              at org.hsqldb.jdbc.jdbcUtil.sqlException(Unknown Source)
>              at org.hsqldb.jdbc.jdbcConnection.<init>(Unknown Source)
>              at org.hsqldb.jdbcDriver.getConnection(Unknown Source)
>              at org.hsqldb.jdbcDriver.connect(Unknown Source)
>              at java.sql.DriverManager.getConnection(DriverManager.java:525)
>              at java.sql.DriverManager.getConnection(DriverManager.java:171)
>              at 
>     org.ecoinformatics.util.DBConnectionFactory.getDBConnection(DBConnectionFac
>    tory.java:91)
>              at 
>     org.ecoinformatics.util.DBConnectionFactory.getDBConnection(DBConnectionFac
>    tory.java:73)
>              at org.kepler.gui.KeplerInitializer.initializeSyste
>     ....
>     
>     ------------
>     Edward A. Lee
>     Professor, Chair of EECS
>     231 Cory Hall, UC Berkeley, Berkeley, CA 94720-1770
>     phone: 510-642-0253 or 510-642-0455, fax: 510-642-2845
>     eal at eecs.Berkeley.EDU, http://ptolemy.eecs.berkeley.edu/~eal  
>     
>     _______________________________________________
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> --------
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-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Matthew B. Jones
jones at nceas.ucsb.edu                         Ph: 805-617-4179
National Center for Ecological Analysis and Synthesis (NCEAS)
UC Santa Barbara     http://www.nceas.ucsb.edu/ecoinformatics
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~