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:[EMAIL PROTECTED] Sent: zondag 4 november 2007 21:57 To: [email protected] 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
