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From "A B (JIRA)" <derby-...@db.apache.org>
Subject [jira] Created: (DERBY-85) NPE when creating a trigger on a table and default schema doesn't exist.
Date Wed, 01 Dec 2004 02:11:28 GMT
NPE when creating a trigger on a table and default schema doesn't exist.
------------------------------------------------------------------------

         Key: DERBY-85
         URL: http://nagoya.apache.org/jira/browse/DERBY-85
     Project: Derby
        Type: Bug
    Versions: 10.0.2.0    
    Reporter: A B


BACKGROUND:

When connecting to a Derby db with a user id and password, the default schema is USER.  For
example, if I connect with:

ij> connect 'jdbc:derby:myDB;user=someUser;password=somePwd';

then the default schema is "SOMEUSER".

PROBLEM:

It turns out that if a table t1 exists in a non-default schema and the default schema (in
this case, "SOMEUSER") doesn't exist yet (because no objects have been created in that schema),
then attempts to create a trigger on t1 using its qualified name will lead to a null pointer
exception in the Derby engine.

REPRO:

In ij:

-- Create database with default schema "SOMEUSER".
ij> connect 'jdbc:derby:myDB;create=true;user=someUser;password=somePwd';

-- Create table t1 in a non-default schema; in this case, call it "ITKO".
ij> create table itko.t1 (i int);
0 rows inserted/updated/deleted

-- Now schema ITKO exists, and T1 exists in schema ITKO, but default schema SOMEUSER does
NOT exist, because we haven't created any objects in that schema yet.

-- So now we try to create a trigger in the ITKO (i.e. the non-default) schema...
ij> create trigger trig1 after update on itko.t1 for each row mode db2sql select * from
sys.systables;
ERROR XJ001: Java exception: ': java.lang.NullPointerException'.

A look at the derby.log file shows the stack trace given below.  In a word, it looks like
the "compilation schema" field of SYS.SYSTRIGGERS isn't getting set, and so it ends up being
null.  That causes the NPE in subsequent processing...

java.lang.NullPointerException
	at org.apache.derby.impl.sql.catalog.SYSSTATEMENTSRowFactory.makeSYSSTATEMENTSrow(SYSSTATEMENTSRowFactory.java:200)
	at org.apache.derby.impl.sql.catalog.DataDictionaryImpl.addSPSDescriptor(DataDictionaryImpl.java:2890)
	at org.apache.derby.impl.sql.execute.CreateTriggerConstantAction.createSPS(CreateTriggerConstantAction.java:354)
	at org.apache.derby.impl.sql.execute.CreateTriggerConstantAction.executeConstantAction(CreateTriggerConstantAction.java:258)
	at org.apache.derby.impl.sql.execute.MiscResultSet.open(MiscResultSet.java:56)
	at org.apache.derby.impl.sql.GenericPreparedStatement.execute(GenericPreparedStatement.java:366)
	at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(EmbedStatement.java:1100)
	at org.apache.derby.impl.jdbc.EmbedStatement.execute(EmbedStatement.java:509)
	at org.apache.derby.impl.jdbc.EmbedStatement.execute(EmbedStatement.java:467)
	at org.apache.derby.impl.tools.ij.ij.executeImmediate(ij.java:299)
	at org.apache.derby.impl.tools.ij.utilMain.doCatch(utilMain.java:433)
	at org.apache.derby.impl.tools.ij.utilMain.go(utilMain.java:310)
	at org.apache.derby.impl.tools.ij.Main.go(Main.java:210)
	at org.apache.derby.impl.tools.ij.Main.mainCore(Main.java:176)
	at org.apache.derby.impl.tools.ij.Main14.main(Main14.java:56)
	at org.apache.derby.tools.ij.main(ij.java:60)

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