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From "Rijk van Haaften (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (DDLUTILS-227) NullPointerException in ModelBasedResultSetIterator
Date Wed, 05 Nov 2008 12:23:44 GMT

    [ https://issues.apache.org/jira/browse/DDLUTILS-227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12645195#action_12645195
] 

cordeo edited comment on DDLUTILS-227 at 11/5/08 4:22 AM:
--------------------------------------------------------------------

Forgot data insertion in previous attachment. My console output is:
DEBUG - Borrowed connection org.apache.commons.dbcp.PoolableConnection@87c268 from data source
DEBUG - About to execute SQL -- -----------------------------------------------------------------------

-- a 
-- ----------------------------------------------------------------------- 

DROP TABLE a IF EXISTS
DEBUG - After execution, 0 row(s) have been changed
DEBUG - About to execute SQL -- -----------------------------------------------------------------------

-- a 
-- ----------------------------------------------------------------------- 

CREATE TABLE a
(
    a BOOLEAN
)
DEBUG - After execution, 0 row(s) have been changed
INFO - Executed 2 SQL command(s) with 0 error(s)
DEBUG - Returning connection org.apache.commons.dbcp.PoolableConnection@87c268 to data source.
Remaining connections: None
DEBUG - Borrowed connection org.apache.commons.dbcp.PoolableConnection@87c268 from data source
DEBUG - About to execute SQL: INSERT INTO a (a) VALUES (?)
DEBUG - Returning connection org.apache.commons.dbcp.PoolableConnection@87c268 to data source.
Remaining connections: None
DEBUG - Borrowed connection org.apache.commons.dbcp.PoolableConnection@87c268 from data source
DEBUG - Returning connection org.apache.commons.dbcp.PoolableConnection@87c268 to data source.
Remaining connections: None
Exception in thread "main" org.apache.ddlutils.DatabaseOperationException: Exception while
reading the row from the resultset
        at org.apache.ddlutils.platform.ModelBasedResultSetIterator.next(ModelBasedResultSetIterator.java:269)
        at org.apache.ddlutils.platform.PlatformImplBase.fetch(PlatformImplBase.java:1638)
        at org.apache.ddlutils.platform.PlatformImplBase.fetch(PlatformImplBase.java:1598)
        at DDLUtilsTest.main(DDLUtilsTest.java:44)
Caused by: java.lang.NullPointerException
        at org.apache.ddlutils.platform.ModelBasedResultSetIterator.next(ModelBasedResultSetIterator.java:237)
        ... 3 more


      was (Author: cordeo):
    Forgot data insertion in previous attachment
  
> NullPointerException in ModelBasedResultSetIterator
> ---------------------------------------------------
>
>                 Key: DDLUTILS-227
>                 URL: https://issues.apache.org/jira/browse/DDLUTILS-227
>             Project: DdlUtils
>          Issue Type: Bug
>          Components: Core (No specific database), Core - HSQLDB
>         Environment: HSQLDB
>            Reporter: Rijk van Haaften
>            Assignee: Thomas Dudziak
>             Fix For: 1.1
>
>         Attachments: DDLUtilsTest.java
>
>
> The bug is in initFromMetaData(Database)
> For subqueries in HSQLDB, tableOfColumn = metaData.getTableName(idx) = "SYSTEM_SUBQUERY",
rather than null or "", so the if-block (see below) is executed.
> That table, of course is not in the model, so table = model.findTable... will set table
to null.
> That is correct. But unlike the else-block, tableOfColumn is left unchanged.
> This causes the tableName to be wrong, which later on sets the _dynaClass to be null:
_dynaClass = model.getDynaClassFor(tableName); // model does not contain a "SYSTEM_SUBQUERY"-table
> This finally causes a NullPointerException in the implementation of next():
> DynaBean bean  = _dynaClass.newInstance();
> The solution is simple: Update the tableOfColumn not only in the else-block, but always
(only the last few lines changed):
>             if ((tableOfColumn != null) && (tableOfColumn.length() > 0))
>             {
>                 _log.debug("Table from metadata: " + tableOfColumn);
>                 // jConnect might return a table name enclosed in quotes
>                 if (tableOfColumn.startsWith("\"") && tableOfColumn.endsWith("\"")
&& (tableOfColumn.length() > 1))
>                 {
>                     tableOfColumn = tableOfColumn.substring(1, tableOfColumn.length()
- 1);
>                 }
>                 // the JDBC driver gave us enough meta data info
>                 table = model.findTable(tableOfColumn, _caseSensitive);
>             }
>             else
>             {
>                 _log.debug("Try query hints");
>                 // not enough info in the meta data of the result set, lets try the
>                 // user-supplied query hints
>                 table         = (Table)_preparedQueryHints.get(_caseSensitive ? columnName
: columnName.toLowerCase());
>             }
>             tableOfColumn = (table == null ? null : table.getName()); // Moved out of
the else-block

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