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From "Niels Beekman" <n.beek...@wis.nl>
Subject RE: JAVA 1.5 enum > typehandler woes
Date Mon, 05 Nov 2007 08:26:04 GMT
Hi,

 

Are you sure this is the complete stacktrace? Did you try debugging?

This error can be caused by numerous things, for example the property
frequency can be null in your bean, ensure that you are handling the
null-case in your typehandler, for a comprehensive explanation, see:

http://opensource.atlassian.com/confluence/oss/display/IBATIS/How+do+I+u
se+a+Custom+Type+Handler+with+complex+property+or+Type+Safe+Enumeration

 

Hth,

 

Niels

________________________________

From: Raymond McDermott [mailto:ray@mcdermott.be] 
Sent: zondag 4 november 2007 21:57
To: user-java@ibatis.apache.org
Subject: JAVA 1.5 enum > typehandler woes

 

I am having some, ahem, fun trying to get enums persisting as varchars
using iBatis 2.3 for Java

Can I just check something... is there are a 'proper' way for iBATIS to
persist enums or do we really have to write a typehandler?  Is this is
something that the developer group will patch in 2.x or is there
something more fundamental in the architecture that makes it a 3.0
feature?

Also, I wonder if i have to do something extra in the definition of an
ENUM to support access by the typehandler framework? 

Anyway, for the moment it seems that we are stuck with the, IMHO overly
complex, task of scripting support for our enum types.  I am getting
null pointers despite debugging the code and seeing that the typehandler
is being properly registered and invoked. 

I have a simple enum class 'frequency':

---> ENUM START

/**
 * The frequency over which measurements are made
 */

public enum Frequency {
    DAILY, 
    WEEKLY, 
    MONTHLY, 
    YEARLY
}


---> ENUM END

I used the generic enum typehandler from the FAQ:

---> GENERIC TYPEHANDLER START

import java.sql.SQLException;

import com.ibatis.sqlmap.client.extensions.ParameterSetter;
import com.ibatis.sqlmap.client.extensions.ResultGetter;
import com.ibatis.sqlmap.client.extensions.TypeHandlerCallback ;

public abstract class EnumTypeHandler<E extends Enum> implements
TypeHandlerCallback
{
    private Class<E> enumClass_;
    
    public EnumTypeHandler(Class<E> enumClass)
    {
        enumClass_ = enumClass;
    }

    @SuppressWarnings("unchecked")
    public void setParameter(ParameterSetter setter, Object parameter)
            throws SQLException
    {
        setter.setString(((E) parameter).name());
    }

    public Object getResult(ResultGetter getter) throws SQLException
    {
        return valueOf(getter.getString());
    }

    @SuppressWarnings("unchecked") 
    public Object valueOf(String s)
    {
        return Enum.valueOf(enumClass_, s);
    }
}

---> GENERIC TYPEHANDLER END

Then I have the simple implementation as proposed in the FAQ:

---> SPECIFIC TYPEHANDLER START

public class FrequencyTypeHandler extends EnumTypeHandler<Frequency> {
    
    public FrequencyTypeHandler() {
    super(Frequency.class);
    }

}

---> SPECIFIC TYPEHANDLER END

---> IBATIS CONFIGURATION FILE START

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

<!DOCTYPE sqlMapConfig      
    PUBLIC "-//ibatis.apache.org//DTD SQL Map Config 2.0//EN"      
    "http://ibatis.apache.org/dtd/sql-map-config-2.dtd">

<sqlMapConfig>

    <typeHandler     javaType="
com.opengrail.circles365.domain.Frequency"
                    jdbcType="VARCHAR"
 
callback="com.opengrail.circles365.config.ibatis.typehandlers.FrequencyT
ypeHandler"/> 

    <typeHandler
javaType="com.opengrail.circles365.domain.MeasurementType"
                    jdbcType="VARCHAR"
 
callback="com.opengrail.circles365.config.ibatis.typehandlers.Measuremen
tTypeTypeHandler "/>


    <!-- List the SQL Map XML files. They can be loaded from the 
         classpath, as they are here (com.domain.data...) -->

    <sqlMap resource="com/opengrail/circles365/config/iBatis-
User.xml"/>
    <sqlMap
resource="com/opengrail/circles365/config/iBatis-MeasurementItem.xml"/>

</sqlMapConfig>

---> IBATIS CONFIGURATION FILE END

---> IBATIS SQLMAP FILE START

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

<!DOCTYPE sqlMap 
    PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN"
    " http://ibatis.apache.org/dtd/sql-map-2.dtd
<http://ibatis.apache.org/dtd/sql-map-2.dtd> ">

<sqlMap namespace="MeasurementItem">

    <resultMap id="result"
class="com.opengrail.circles365.domain.impl.MeasurementItemImpl ">
        <result property="frequency" column="FREQUENCY"/>
        <result property="measurementType" column="MEASUREMENTTYPE"/>
        <result property="name" column="ITEMNAME"/> 
        <result property="derived" column="ISDERIVED"/>
    </resultMap>

    <select id="findMeasurementItemsByUserId" resultMap="result">
        select     FREQUENCY, MEASURETYPE, ITEMNAME, ISDERIVED 
        from     C365MEASUREMENTITEM MI, C365USER U
        where    U.USERID = #value#
        and        MI.USERID = U.ID
    </select>

    <insert id="createMeasurementItem" parameterClass="
com.opengrail.circles365.domain.MeasurementItem">
        insert 
        into C365MEASUREMENTITEM (frequency, measuretype, itemname,
isderived, userid)
            select     #frequency#, #measurementType#, #name#,
#derived#, u.id
            from     c365user u
            where     u.userid = #userId#
    </insert>

</sqlMap>

---> IBATIS SQLMAP FILE END

Unit test trace ON INSERT: 

org.springframework.jdbc.UncategorizedSQLException: SqlMapClient
operation; uncategorized SQLException for SQL []; SQL state [null];
error code [0];   
--- The error occurred in com/opengrail/circles365/config/iBatis-
MeasurementItem.xml.  
--- The error occurred while applying a parameter map.  
--- Check the createMeasurementItem-InlineParameterMap.  
--- Check the parameter mapping for the 'frequency' property.  
--- Cause: java.lang.NullPointerException; nested exception is
com.ibatis.common.jdbc.exception.NestedSQLException:   
--- The error occurred in
com/opengrail/circles365/config/iBatis-MeasurementItem.xml.  
--- The error occurred while applying a parameter map.  
--- Check the createMeasurementItem-InlineParameterMap.  
--- Check the parameter mapping for the 'frequency' property.  
--- Cause: java.lang.NullPointerException
Caused by: com.ibatis.common.jdbc.exception.NestedSQLException:   
--- The error occurred in
com/opengrail/circles365/config/iBatis-MeasurementItem.xml .  
--- The error occurred while applying a parameter map.  
--- Check the createMeasurementItem-InlineParameterMap.  
--- Check the parameter mapping for the 'frequency' property.  
--- Cause: java.lang.NullPointerException 
    at
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeUpdat
e(GeneralStatement.java:94)
    at
com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.update(SqlMapExecut
orDelegate.java:505)
    at
com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.update(SqlMapSessionImpl
.java:90)
    at
org.springframework.orm.ibatis.SqlMapClientTemplate$10.doInSqlMapClient(
SqlMapClientTemplate.java:383)
    at org.springframework.orm.ibatis.SqlMapClientTemplate.execute
(SqlMapClientTemplate.java:193)
    at
org.springframework.orm.ibatis.SqlMapClientTemplate.update(SqlMapClientT
emplate.java:381)
    at
com.opengrail.circles365.data.impl.MeasurementItemDaoImpl.createMeasurem
entItem (MeasurementItemDaoImpl.java:13)
    at
com.opengrail.circles365.service.impl.MeasurementItemManagementImpl.crea
teMeasurementItem(MeasurementItemManagementImpl.java:25)
    at
com.opengrail.circles365.tests.ServiceImplementationTests.testGoodMeasur
ementItem (ServiceImplementationTests.java:56)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav
a:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:585)
    at junit.framework.TestCase.runTest(TestCase.java:154)
    at junit.framework.TestCase.runBare(TestCase.java:127) 
    at
org.springframework.test.ConditionalTestCase.runBare(ConditionalTestCase
.java:69)
    at junit.framework.TestResult$1.protect(TestResult.java:106)
    at junit.framework.TestResult.runProtected(TestResult.java :124)
    at junit.framework.TestResult.run(TestResult.java:109)
    at junit.framework.TestCase.run(TestCase.java:118)
    at junit.framework.TestSuite.runTest(TestSuite.java:208)
    at junit.framework.TestSuite.run (TestSuite.java:203)
    at
org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUn
it3TestReference.java:130)
    at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.ja
va:38)
    at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTe
stRunner.java:460)
    at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTe
stRunner.java:673)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run
(RemoteTestRunner.java:386)
    at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRu
nner.java:196)
Caused by: java.lang.NullPointerException
    at
com.ibatis.sqlmap.engine.mapping.parameter.BasicParameterMap.setParamete
r (BasicParameterMap.java:165)
    at
com.ibatis.sqlmap.engine.mapping.parameter.BasicParameterMap.setParamete
rs(BasicParameterMap.java:125)
    at
com.ibatis.sqlmap.engine.execution.SqlExecutor.executeUpdate(SqlExecutor
.java :79)
    at
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.sqlExecuteUp
date(GeneralStatement.java:200)
    at
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeUpdat
e(GeneralStatement.java :78)
    ... 27 more

Do any of you folks have any ideas?

Thanks in advance for your support.

Ray




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