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https://issues.apache.org/jira/browse/DERBY-4779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13052162#comment-13052162
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Rick Hillegas commented on DERBY-4779:
--------------------------------------
Hi Siddharth,
You seem to be calling assertTriggerStatus() in order to confirm the behavior
of the table and trigger you added. That method verifies the behavior of
triggers which call the report_proc procedure. Your trigger doesn't call
report_proc. Instead, your trigger just inserts into a dummy table. To verify
the operation of your trigger, you need to verify the contents of the dummy
table. To fix the test, I would do one of the following:
1) Rewrite your trigger so that it calls report_proc like the other triggers in
test_007_basicTriggers().
2) Or rewrite your assertion to invoke assertResults() rather than
assertTriggerStatus().
Hope this helps,
-Rick
> NPE while inserting into a table which has a generated column and an insert
> trigger
> -----------------------------------------------------------------------------------
>
> Key: DERBY-4779
> URL: https://issues.apache.org/jira/browse/DERBY-4779
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.5.3.0, 10.6.1.0, 10.7.1.1
> Reporter: Rick Hillegas
> Assignee: Siddharth Srivastava
> Labels: derby_triage10_8
> Attachments: d4779.diff, test1.diff, testreport.txt
>
>
> The following script generates an NPE on the concluding insert:
> connect 'jdbc:derby:memory:dummy;create=true';
> create function getRegion( v int )
> returns varchar( 20 )
> language java parameter style java deterministic no sql
> external name 'java.lang.Integer.toString'
> ;
> create table orders
> (
> orderID bigint primary key,
> salesPrice int not null,
> region generated always as ( getRegion( salesPrice ) )
> )
> ;
> create table dummy( a int );
> create trigger newOrderTrigger
> after insert on orders
> for each row
> insert into dummy( a ) values ( 1 )
> ;
> insert into orders( orderID, salesPrice ) values ( 1, 2 )
> ;
> ------------------------
> Here is the NPE:
> java.lang.NullPointerException
> at
> org.apache.derby.impl.sql.execute.DMLWriteResultSet.objectifyStreams(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.DMLWriteResultSet.getNextRowCore(Unknown
> Source)
> at org.apache.derby.impl.sql.execute.InsertResultSet.open(Unknown
> Source)
> at
> org.apache.derby.impl.sql.GenericPreparedStatement.executeStmt(Unknown Source)
> at org.apache.derby.impl.sql.GenericPreparedStatement.execute(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
> at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
> at org.apache.derby.impl.tools.ij.ij.executeImmediate(Unknown Source)
> at org.apache.derby.impl.tools.ij.utilMain.doCatch(Unknown Source)
> at org.apache.derby.impl.tools.ij.utilMain.runScriptGuts(Unknown Source)
> at org.apache.derby.impl.tools.ij.utilMain.go(Unknown Source)
> at org.apache.derby.impl.tools.ij.Main.go(Unknown Source)
> at org.apache.derby.impl.tools.ij.Main.mainCore(Unknown Source)
> at org.apache.derby.impl.tools.ij.Main.main(Unknown Source)
> at org.apache.derby.tools.ij.main(Unknown Source)
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