Re: Re : Problem with iBatis SQLMap and stored procedure

Beemsterboer Software Tue, 16 May 2006 14:19:09 -0700

Hi,

As you've already pointed out in the stacktrace, the problem "clearly"comes from DBCP:

Caused by:java.lang.NullPointerException

   at 
org.apache.commons.dbcp.DelegatingResultSet.close(DelegatingResultSet.java:132)

I haven't met this problem before, but I already had Tomcat working withiBatis using the Datasource configuration.

By the way, you don't need the <![CDATA[ part in your stored proceduremapping.

Good luck with your team training!

Greetings,
Hans Beemsterboer.

Cyril wrote:

Hi,

I tried your suggestion and it works !

I was very surprised, because I downloaded DBCP sources and managed to continue 
my debugging. It suggested that the CallbackStatement.execute() didn't return 
any result; but since it is a DelegatingCallableStatement, I suspected there 
may be some kind of lazy initialisation. My conclusion was there is some kind 
of bug in Sybase JDBC driver, or special parameters which prevent us to use 
iBatis with Tomcat and Sybase.

I am ecstatic you found the solution to my problem so easily. Have you met this 
problem before? Do you know any problem between DBCP and Sybase or iBatis?

Thank you very much, you saved my (professional) life (I did push iBatis on 
this project and another project very strongly) !

Cyril

PS: my post can also be viewed as an exemple of how to use iBatis and stored 
procedures. The documentation of iBatis is not very wordy on this.


----- Message d'origine ----
De : Beemsterboer Software <[EMAIL PROTECTED]>
À : user-java@ibatis.apache.org
Cc : [EMAIL PROTECTED]
Envoyé le : Mardi, 16 Mai 2006, 6h49mn 30s
Objet : Re: Problem with iBatis SQLMap and stored procedure

Hi Cyril,

Can you try to configure the Tomcat Datasource without DBCP?

For example, here is a configuration for MySQL:

  <Resource name="xxxx" auth="Container"
            type="javax.sql.DataSource"/>
  <ResourceParams name="xxxx">
    <parameter>
      <name>username</name>
      <value></value>
    </parameter>
    <parameter>
      <name>password</name>
      <value></value>
    </parameter>
    <parameter>
      <name>driverClassName</name>
      <value>com.mysql.jdbc.Driver</value>
    </parameter>
    <parameter>
      <name>url</name>

<value>jdbc:mysql:///test?jdbcCompliantTruncation=false&zeroDateTimeBehavior=convertToNull</value>

    </parameter>
    <parameter>
      <name>maxActive</name>
      <value>8</value>
    </parameter>
    <parameter>
      <name>maxIdle</name>
      <value>4</value>
    </parameter>
  </ResourceParams>

Cyril wrote:

Hi everybody,

Please, can you help me?

I'm migrating a web application from proprietary JDBC framework to iBatis. 
Every data retrieving from the database come from stored procedure.
I managed to refactor a small unit, after some difficulties finding the correct 
syntax for stored procedure returning an object, and a problem with Websphere 
creating a new transaction never commited. Everything was alright, and I set up 
a small training for my team to present iBatis with a live exemple.

Then, we decided to use Tomcat instead of Websphere, in dev environment, and we 
noticed my code didn't work anymore.
It works on Webphere, and not in Tomcat. Another topic in the mailing list is 
very similar:

http://www.mail-archive.com/user-java@ibatis.apache.org/msg00942.html

but since the procedure returns several columns (we map an object from them), I 
can't use the answer here: 
http://www.mail-archive.com/user-java@ibatis.apache.org/msg00946.html

Here are some more informations:

I debugged from the iBatis source, and the deeper I managed to get was :
File: SqlExecutor.java, method: handleResults(RequestScope, ResultSet, int, 
int, RowHandlerCallback)
Line: if (rs.getType() != ResultSet.TYPE_FORWARD_ONLY)
I suspect rs.getType throws a nullpointerexception (but rs is a 
DelegationResultSet, and is not null)

The stack trace is:

2006-05-16 15:02:48,413 ERROR[http-8080-Processor5] xxxxx.model.client.dao.impl.ClientDescriptionIbatisDAO(41) - SQLException--- The error occurred in xxxxx/ibatis/sqlmap/ClientDescription.xml.--- The error occurred while applying a parameter map.--- Check the ClientDescription.clientDescriptionParams.--- Check the results (failed to retrieve results).--- Cause: java.lang.NullPointerExceptioncom.ibatis.common.jdbc.exception.NestedSQLException:--- The error occurred in xxxxx/ibatis/sqlmap/ClientDescription.xml.--- The error occurred while applying a parameter map.--- Check the ClientDescription.clientDescriptionParams.--- Check the results (failed to retrieve results).--- Cause: java.lang.NullPointerException

Caused by: java.lang.NullPointerException
    at 
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback(GeneralStatement.java:188)
    at 
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryForObject(GeneralStatement.java:104)
    at 
com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForObject(SqlMapExecutorDelegate.java:561)
    at 
com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForObject(SqlMapExecutorDelegate.java:536)
    at 
com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForObject(SqlMapSessionImpl.java:93)
    at 
com.ibatis.sqlmap.engine.impl.SqlMapClientImpl.queryForObject(SqlMapClientImpl.java:70)
...........
Caused by: java.lang.NullPointerException
    at 
org.apache.commons.dbcp.DelegatingResultSet.close(DelegatingResultSet.java:132)
    at 
com.ibatis.sqlmap.engine.execution.SqlExecutor.closeResultSet(SqlExecutor.java:423)
    at 
com.ibatis.sqlmap.engine.execution.SqlExecutor.executeQueryProcedure(SqlExecutor.java:305)
    at 
com.ibatis.sqlmap.engine.mapping.statement.ProcedureStatement.sqlExecuteQuery(ProcedureStatement.java:34)
    at 
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback(GeneralStatement.java:173)
    ... 60 more

Caused by:java.lang.NullPointerException

    at 
org.apache.commons.dbcp.DelegatingResultSet.close(DelegatingResultSet.java:132)
    at 
com.ibatis.sqlmap.engine.execution.SqlExecutor.closeResultSet(SqlExecutor.java:423)
    at 
com.ibatis.sqlmap.engine.execution.SqlExecutor.executeQueryProcedure(SqlExecutor.java:305)
    at 
com.ibatis.sqlmap.engine.mapping.statement.ProcedureStatement.sqlExecuteQuery(ProcedureStatement.java:34)


My sqlmap-config file is:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE sqlMapConfig
    PUBLIC "-//iBATIS.com//DTD SQL MAP Config 2.0//EN"
    "http://www.ibatis.com/dtd/sql-map-config-2.dtd";;>

<sqlMapConfig>

    <settings
        cacheModelsEnabled="true"
        enhancementEnabled="false"
        lazyLoadingEnabled="true"
        maxRequests="256"
        maxSessions="32"
        maxTransactions="16"
        useStatementNamespaces="false"
    />

<!-- Normal version, but we can't use it because of Websphere
    <transactionManager type="JDBC">
        <dataSource type="JNDI">
            <property name="DataSource" value="java:comp/env/jdbc/xxxxx"/>
        </dataSource>
    </transactionManager>
-->

<!-- Special version, because Websphere create a transaction itself, and never 
commit or rollback it -->
    <transactionManager commitRequired="true"  type="EXTERNAL">
        <property name="DefaultAutoCommit" value="false"/>
        <property name="SetAutoCommitAllowed" value="false"/>
        <dataSource type="JNDI">
            <property name="DataSource" value="java:comp/env/jdbc/xxxxx"/>
        </dataSource>
    </transactionManager>

    <sqlMap resource="xxxxx/ibatis/sqlmap/ClientDescription.xml"/>

</sqlMapConfig>



NOTE : I TRY WITH THE "NORMAL SECTION" AND TOMCAT TOO. I tried both, and had 
the same results.

My sqlmap file:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE sqlMap PUBLIC "-//iBATIS.com//DTD SQL Map 2.0//EN""http://www.ibatis.com/dtd/sql-map-2.dtd";;>


<sqlMap namespace="ClientDescription">

    <typeAlias alias="clientDescription" 
type="xxxxx.ibatis.pojo.IbatisClientDescription"/>

<parameterMap id="clientDescriptionParams" class="java.util.Map">

        <parameter property="contextId"/>
        <parameter property="ricosId"/>
    </parameterMap>

    <resultMap id="clientDescriptionResult" class="clientDescription">
        <result property="sector" column="SECTOR"/>
        <result property="sectorLab" column="SECTORLABEL"/>
        <result property="category" column="CATEGORY"/>
        <result property="categoryLab" column="CATEGORYLABEL"/>
        <result property="economicSector" column="ECONOMICSECTOR"/>
        <result property="economicSectorLab" column="BUSAREALABEL"/>
        <result property="businessArea" column="BUSAREA"/>
        <result property="businessAreaLab" column="BUSAREALABEL"/>
        <result property="country" column="COUNTRY"/>
        <result property="countryLab" column="COUNTRYLABEL"/>
        <result property="residence" column="RESIDENCE"/>
        <result property="residenceLab" column="RESIDENCELABEL"/>
        <result property="region" column="REGION"/>
        <result property="regionLab" column="REGIONLABEL"/>
        <result property="rating" column="RATING"/>
        <result property="ratingLab" column="RATINGLABEL"/>
        <result property="freezeDateAsSybase" column="FREEZEDATE"/>
        <result property="comment" column="COMMENT"/>
    </resultMap>

<procedure id="getClientDescription" parameterMap="clientDescriptionParams" resultMap="clientDescriptionResult">

        <![CDATA[
            {call CCCCustomersDetail(?, ?)}
        ]]>
    </procedure>

</sqlMap>

The problem may come from 
org.apache.commons.dbcp.DelegatingResultSet.close(DelegatingResultSet.java:132) 
(which seems to be a Tomcat class), anybody found some way to make calling 
stored procedure (Database is SYBASE) work?


I hope you could help me,
sorry for the bad english,

Cyril

Re: Re : Problem with iBatis SQLMap and stored procedure

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