[DERBY-3718] NPE when firing a trigger

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 10.4.1.3, 10.5.1.1
• Fix Version/s: 10.4.2.0, 10.5.1.1
• Component/s: SQL
• Bug behavior facts: Regression
• Assignee: Mamta A. Satoor
• Reporter: Richard N. Hillegas
• Created: 10/Jun/08 18:18
• Updated: 13/Jul/10 19:18
• Resolved: 25/Jun/08 18:22

Description

NullPointerException raised when firing a trigger. Originally reported by Thiyagu P on the Derby user list: http://www.nabble.com/Trigger-function-broken-in-10.4.1.3--td17760208.html#a17760208 Thiyagu reports that the same script works fine in 10.3.3.0. Here's the script:

CREATE TABLE TRADE(
ID INT PRIMARY KEY GENERATED BY DEFAULT AS IDENTITY (START WITH 1000),
BUYID INT NOT NULL,
QTY FLOAT(2) NOT NULL
);

CREATE TABLE TOTAL(BUYID INT NOT NULL, TOTALQTY FLOAT(2) NOT NULL);

CREATE TRIGGER TRADE_INSERT
AFTER INSERT ON TRADE
REFERENCING NEW AS NEWROW
FOR EACH ROW MODE DB2SQL
UPDATE TOTAL SET TOTALQTY = NEWROW.QTY WHERE BUYID = NEWROW.BUYID;

INSERT INTO TOTAL VALUES (1, 0);

INSERT INTO TRADE VALUES(1, 1, 10);

Here's the stack trace:

java.lang.NullPointerException
at org.apache.derby.iapi.types.DataTypeDescriptor.getNull(DataTypeDescriptor.java:1008)
at org.apache.derby.iapi.types.DataTypeDescriptor.normalize(DataTypeDescriptor.java:645)
at org.apache.derby.impl.sql.execute.NormalizeResultSet.normalizeRow(NormalizeResultSet.java:329)
at org.apache.derby.impl.sql.execute.NormalizeResultSet.getNextRowCore(NormalizeResultSet.java:189)
at org.apache.derby.impl.sql.execute.DMLWriteResultSet.getNextRowCore(DMLWriteResultSet.java:127)
at org.apache.derby.impl.sql.execute.UpdateResultSet.collectAffectedRows(UpdateResultSet.java:424)
at org.apache.derby.impl.sql.execute.UpdateResultSet.open(UpdateResultSet.java:246)
at org.apache.derby.impl.sql.GenericPreparedStatement.execute(GenericPreparedStatement.java:384)
at org.apache.derby.impl.sql.execute.GenericTriggerExecutor.executeSPS(GenericTriggerExecutor.java:159)
at org.apache.derby.impl.sql.execute.RowTriggerExecutor.fireTrigger(RowTriggerExecutor.java:111)
at org.apache.derby.impl.sql.execute.TriggerEventActivator.notifyEvent(TriggerEventActivator.java:269)
at org.apache.derby.impl.sql.execute.InsertResultSet.normalInsertCore(InsertResultSet.java:1150)
at org.apache.derby.impl.sql.execute.InsertResultSet.open(InsertResultSet.java:487)
at org.apache.derby.impl.sql.GenericPreparedStatement.execute(GenericPreparedStatement.java:384)
at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(EmbedStatement.java:1235)
at org.apache.derby.impl.jdbc.EmbedStatement.execute(EmbedStatement.java:625)
at org.apache.derby.impl.jdbc.EmbedStatement.execute(EmbedStatement.java:555)
at org.apache.derby.impl.tools.ij.ij.executeImmediate(ij.java:329)
at org.apache.derby.impl.tools.ij.utilMain.doCatch(utilMain.java:508)
at org.apache.derby.impl.tools.ij.utilMain.runScriptGuts(utilMain.java:350)
at org.apache.derby.impl.tools.ij.utilMain.go(utilMain.java:248)
at org.apache.derby.impl.tools.ij.Main.go(Main.java:215)
at org.apache.derby.impl.tools.ij.Main.mainCore(Main.java:181)
at org.apache.derby.impl.tools.ij.Main.main(Main.java:73)
at org.apache.derby.tools.ij.main(ij.java:59)