PH01681: CASE THEN AND ELSE SCALAR EXPRESSION CONSTANTS SHOULD NOT BE CASTED TO CASE OPERAND TYPE

Fixes are available

APAR status

Closed as program error.

Error description

Given a JPQL query utilizing a CASE expression, Eclipselink
JPQL processing can inappropriately force-typecast the
THEN/ELSE scalar_expressions to the CASE's case_operation
type.
The incompatible typecasting can can lead to a failure.

Local fix

```
N/A
```

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server Liberty - Java Persistence APA - JPA *
*                  2.1 & EclipseLink                           *
****************************************************************
* PROBLEM DESCRIPTION: EclipseLink throws an exception when    *
*                      parsing a Query containing a CASE       *
*                      function with an operand                *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
The following sample code demonstrates how an application would
encounter this exception:

Query:
TypedQuery<EntityTbl01> query = em.createQuery(""
    + "SELECT t FROM EntityTbl01 t "
    + "WHERE t.itemString1 = ( "
        + "CASE t.itemInteger1 "
            + "WHEN 1000 THEN '047010' "
            + "WHEN 100 THEN '023010' "
            + "ELSE '033020' "
        + "END )", EntityTbl01.class);

Entity:
@Entity
@Table(name="SIMPLE_TBL01")
public class EntityTbl01 implements Serializable {
    @Column(name="ITEM_STRING1")
    private String itemString1;

    @Column(name="ITEM_INTEGER1")
    private Integer itemInteger1;
}

Notice that the query contains a CASE function with an operand
't.itemInteger1'. According to the JPA specification, Section
4.8.6, the result of the CASE function should be the product of
the THEN and ELSE expressions. However, EclipseLink is
attempting to use the operand as the return type. As a result,
the following exception is thrown:

java.sql.SQLSyntaxErrorException: Comparisons between 'VARCHAR
(UCS_BASIC)' and 'INTEGER' are not supported. Types must be
comparable. String types must also have matching collation. If
collation does not match, a possible solution is to cast
operands to force them to the default collation (e.g. SELECT
tablename FROM sys.systables WHERE CAST(tablename AS
VARCHAR(128)) = 'T1')
	at
org.apache.derby.client.am.SQLExceptionFactory.getSQLException(U
nknown Source)
	at
org.apache.derby.client.am.SqlException.getSQLException(Unknown
Source)
	at
org.apache.derby.client.am.ClientStatement.executeQuery(Unknown
Source)
	at
org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor
.executeSelect(DatabaseAccessor.java:1007)
	at
org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor
.basicExecuteCall(DatabaseAccessor.java:644)

Problem conclusion

The fix for this APAR changes the EclipseLink implementation and
involves an update to the thirdparty source. See
https://bugs.eclipse.org/bugs/show_bug.cgi?id=537795

This fix is currently targeted for WebSphere Application Server
9.0.0.10 and WebSphere Liberty 18.0.0.3.  Please refer to the
Recommended Updates page for delivery information:
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980

Temporary fix

Comments

APAR Information

APAR number
PH01681
Reported component name
LIBERTY PROFILE
Reported component ID
5724J0814
Reported release
CD0
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-08-13
Closed date
2018-10-16
Last modified date
2018-10-16

APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:

Fix information

Fixed component name
LIBERTY PROFILE
Fixed component ID
5724J0814

Applicable component levels

RCD0 PSY
UP

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"CD0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
17 October 2021

Tips

PH01681: CASE THEN AND ELSE SCALAR EXPRESSION CONSTANTS SHOULD NOT BE CASTED TO CASE OPERAND TYPE

Fixes are available

Subscribe

APAR status

Closed as program error.

Error description

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

APAR number

Reported component name

Reported component ID

Reported release

Status

PE

HIPER

Special Attention

Submitted date

Closed date

Last modified date

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Fix information

Fixed component name

Fixed component ID

Applicable component levels

RCD0 PSY

Document Information

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