I'm missing the default constructors (public Foo() etc.) Marc Heimann Software Engineer
Prolifics Deutschland GmbH
Notkestr. 3, D-22607 Hamburg
phone +49 (0)40 890 667-70
fax +49 (0)40 890 667-99
[EMAIL PROTECTED]
2007 IBM Award Winner for Overall Technical Excellence
SOA... Building Future Business Solutions Today
Handelsregister: Hamburg, HRB 89903
Geschäftsführer: Ulrich Frotscher
Kenny Pearce <[EMAIL PROTECTED]> wrote on 13.09.2007 15:43:49:
> Alright, this is pretty long, but I've developed a basic case for the
> problem I'm having, and all the files, output, etc. are copied below.
> Maybe you can explain what I'm doing wrong.
>
> =============== table create statement =====================
> create table my_table (foo varchar(20), bar varchar(20), sub_bar
> varchar(20));
>
> =============== insert statement ====================
> insert into my_table values ('foo', 'bar', 'sub_bar');
>
> =============== config.properties ==================
> JDBC.Driver=com.mysql.jdbc.Driver
> JDBC.ConnectionURL=jdbc:mysql://localhost:3306/ibatis_test
> JDBC.Username=root
> JDBC.Password=root
>
> =============== config.xml ================
> <?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>
> <properties resource="sqlmapconfig/config.properties"/>
>
> <transactionManager type="JDBC">
> <dataSource type="SIMPLE">
> <property name="JDBC.Driver" value="${JDBC.Driver}"
> />
> <property name="JDBC.ConnectionURL"
> value="${JDBC.ConnectionURL}" />
> <property name="JDBC.Username" value="${JDBC.Username}"
> />
> <property name="JDBC.Password" value="${JDBC.Password}"
> />
> </dataSource>
> </transactionManager>
>
> <sqlMap resource="sqlmapconfig/Foo.xml"/>
> </sqlMapConfig>
>
> ================ Foo.xml ================
> <?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="Foo">
> <resultMap class="Foo" id="fooResultMap">
> <result property="fooString" column="foo"/>
> <result property="myBar" resultMap="Foo.barResultMap"/>
> </resultMap>
> <resultMap class="SubBar" id="barResultMap">
> <result property="barString" column="bar"/>
> <result property="subBarString" column="sub_bar"/>
> </resultMap>
>
> <select id="fooSelect" parameterClass="string" resultClass="Foo"
> resultMap="fooResultMap">
> SELECT foo, bar, sub_bar from my_table WHERE foo = #value#
> </select>
> </sqlMap>
>
> ========================== Foo.java ========================
> public class Foo {
> private String fooString;
> private Bar myBar;
>
> public String getFooString() {
> return fooString;
> }
> public void setFooString(String fooString) {
> this.fooString = fooString;
> }
> public Bar getMyBar() {
> return myBar;
> }
> public void setMyBar(Bar myBar) {
> this.myBar = myBar;
> }
> }
>
> ===================== Bar.java ====================
> public abstract class Bar {
> private String barString;
>
> public String getBarString() {
> return barString;
> }
>
> public void setBarString(String barString) {
> this.barString = barString;
> }
> }
>
> =================== SubBar.java =======================
> public class SubBar extends Bar {
> private String subBarString;
>
> public String getSubBarString() {
> return subBarString;
> }
>
> public void setSubBarString(String subBarString) {
> this.subBarString = subBarString;
> }
> }
>
> ==================== SQLTest.java ================
> import java.io.InputStreamReader;
> import java.io.Reader;
>
> import com.ibatis.sqlmap.client.SqlMapClient;
> import com.ibatis.sqlmap.client.SqlMapClientBuilder;
>
>
> public class SQLTest {
> /**
> * @param args
> */
> public static void main(String[] args) {
> SqlMapClient sql = null;
> try
> {
> Reader reader = new
> InputStreamReader(SQLTest.class.getResourceAsStream("/sqlmapconfig/
> config.xml"));
> sql = SqlMapClientBuilder.buildSqlMapClient(reader);
> }
> catch (Throwable t)
> {
> t.printStackTrace();
> System.exit(1);
> }
>
> Foo myFoo = null;
> try{
> myFoo = (Foo)sql.queryForObject("fooSelect", "foo");
> }catch(Throwable t){
> t.printStackTrace();
> System.exit(2);
> }
>
> System.out.println(myFoo.getFooString() + " - " +
> myFoo.getMyBar().getBarString()
> + " - " + ((SubBar)myFoo.getMyBar()).getSubBarString());
> }
> }
>
> =============================================================
>
> Executing SQLTest results in the following being printed to stderr:
>
> com.ibatis.common.jdbc.exception.NestedSQLException:
> --- The error occurred in sqlmapconfig/Foo.xml.
> --- The error occurred while applying a result map.
> --- Check the Foo.fooResultMap.
> --- The error happened while setting a property on the result object.
> --- Cause: com.ibatis.sqlmap.client.SqlMapException: Error instantiating
> collection property for mapping 'myBar'. Cause:
> java.lang.InstantiationException
> Caused by: java.lang.InstantiationException
> Caused by: com.ibatis.sqlmap.client.SqlMapException: Error instantiating
> collection property for mapping 'myBar'. Cause:
> java.lang.InstantiationException
> Caused by: java.lang.InstantiationException
> 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)
> at SQLTest.main(SQLTest.java:27)
> Caused by: com.ibatis.sqlmap.client.SqlMapException: Error instantiating
> collection property for mapping 'myBar'. Cause:
> java.lang.InstantiationException
> Caused by: java.lang.InstantiationException
> at
>
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.setNestedResultMappingValue
> (BasicResultMap.java:397)
> at
>
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.applyNestedResultMap
> (BasicResultMap.java:369)
> at
>
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.setResultObjectValues
> (BasicResultMap.java:355)
> at
>
com.ibatis.sqlmap.engine.mapping.statement.RowHandlerCallback.handleResultObject
> (RowHandlerCallback.java:63)
> at
> com.ibatis.sqlmap.engine.execution.SqlExecutor.handleResults
> (SqlExecutor.java:395)
> at
> com.ibatis.sqlmap.engine.execution.SqlExecutor.executeQuery
> (SqlExecutor.java:185)
> at
>
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.sqlExecuteQuery
> (GeneralStatement.java:205)
> at
>
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback
> (GeneralStatement.java:173)
> ... 6 more
> Caused by: java.lang.InstantiationException
> at
> sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance
> (InstantiationExceptionConstructorAccessorImpl.java:30)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> at java.lang.Class.newInstance0(Class.java:355)
> at java.lang.Class.newInstance(Class.java:308)
> at
>
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.setNestedResultMappingValue
> (BasicResultMap.java:395)
> ... 13 more
>
> Caused by:
> com.ibatis.sqlmap.client.SqlMapException: Error instantiating collection
> property for mapping 'myBar'. Cause: java.lang.InstantiationException
> Caused by: java.lang.InstantiationException
> at
>
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.setNestedResultMappingValue
> (BasicResultMap.java:397)
> at
>
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.applyNestedResultMap
> (BasicResultMap.java:369)
> at
>
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.setResultObjectValues
> (BasicResultMap.java:355)
> at
>
com.ibatis.sqlmap.engine.mapping.statement.RowHandlerCallback.handleResultObject
> (RowHandlerCallback.java:63)
> at
> com.ibatis.sqlmap.engine.execution.SqlExecutor.handleResults
> (SqlExecutor.java:395)
> at
> com.ibatis.sqlmap.engine.execution.SqlExecutor.executeQuery
> (SqlExecutor.java:185)
> at
>
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.sqlExecuteQuery
> (GeneralStatement.java:205)
> at
>
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback
> (GeneralStatement.java:173)
> 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)
> at SQLTest.main(SQLTest.java:27)
> Caused by: java.lang.InstantiationException
> at
> sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance
> (InstantiationExceptionConstructorAccessorImpl.java:30)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> at java.lang.Class.newInstance0(Class.java:355)
> at java.lang.Class.newInstance(Class.java:308)
> at
>
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.setNestedResultMappingValue
> (BasicResultMap.java:395)
> ... 13 more
>
> Caused by:
> java.lang.InstantiationException
> at
> sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance
> (InstantiationExceptionConstructorAccessorImpl.java:30)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> at java.lang.Class.newInstance0(Class.java:355)
> at java.lang.Class.newInstance(Class.java:308)
> at
>
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.setNestedResultMappingValue
> (BasicResultMap.java:395)
> at
>
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.applyNestedResultMap
> (BasicResultMap.java:369)
> at
>
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.setResultObjectValues
> (BasicResultMap.java:355)
> at
>
com.ibatis.sqlmap.engine.mapping.statement.RowHandlerCallback.handleResultObject
> (RowHandlerCallback.java:63)
> at
> com.ibatis.sqlmap.engine.execution.SqlExecutor.handleResults
> (SqlExecutor.java:395)
> at
> com.ibatis.sqlmap.engine.execution.SqlExecutor.executeQuery
> (SqlExecutor.java:185)
> at
>
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.sqlExecuteQuery
> (GeneralStatement.java:205)
> at
>
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback
> (GeneralStatement.java:173)
> 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)
> at SQLTest.main(SQLTest.java:27)
>
> Caused by:
> com.ibatis.sqlmap.client.SqlMapException: Error instantiating collection
> property for mapping 'myBar'. Cause: java.lang.InstantiationException
> Caused by: java.lang.InstantiationException
> at
>
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.setNestedResultMappingValue
> (BasicResultMap.java:397)
> at
>
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.applyNestedResultMap
> (BasicResultMap.java:369)
> at
>
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.setResultObjectValues
> (BasicResultMap.java:355)
> at
>
com.ibatis.sqlmap.engine.mapping.statement.RowHandlerCallback.handleResultObject
> (RowHandlerCallback.java:63)
> at
> com.ibatis.sqlmap.engine.execution.SqlExecutor.handleResults
> (SqlExecutor.java:395)
> at
> com.ibatis.sqlmap.engine.execution.SqlExecutor.executeQuery
> (SqlExecutor.java:185)
> at
>
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.sqlExecuteQuery
> (GeneralStatement.java:205)
> at
>
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback
> (GeneralStatement.java:173)
> 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)
> at SQLTest.main(SQLTest.java:27)
> Caused by: java.lang.InstantiationException
> at
> sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance
> (InstantiationExceptionConstructorAccessorImpl.java:30)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> at java.lang.Class.newInstance0(Class.java:355)
> at java.lang.Class.newInstance(Class.java:308)
> at
>
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.setNestedResultMappingValue
> (BasicResultMap.java:395)
> ... 13 more
>
> Caused by:
> java.lang.InstantiationException
> at
> sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance
> (InstantiationExceptionConstructorAccessorImpl.java:30)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> at java.lang.Class.newInstance0(Class.java:355)
> at java.lang.Class.newInstance(Class.java:308)
> at
>
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.setNestedResultMappingValue
> (BasicResultMap.java:395)
> at
>
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.applyNestedResultMap
> (BasicResultMap.java:369)
> at
>
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.setResultObjectValues
> (BasicResultMap.java:355)
> at
>
com.ibatis.sqlmap.engine.mapping.statement.RowHandlerCallback.handleResultObject
> (RowHandlerCallback.java:63)
> at
> com.ibatis.sqlmap.engine.execution.SqlExecutor.handleResults
> (SqlExecutor.java:395)
> at
> com.ibatis.sqlmap.engine.execution.SqlExecutor.executeQuery
> (SqlExecutor.java:185)
> at
>
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.sqlExecuteQuery
> (GeneralStatement.java:205)
> at
>
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback
> (GeneralStatement.java:173)
> 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)
> at SQLTest.main(SQLTest.java:27)
>
> Caused by:
> java.lang.InstantiationException
> at
> sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance
> (InstantiationExceptionConstructorAccessorImpl.java:30)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> at java.lang.Class.newInstance0(Class.java:355)
> at java.lang.Class.newInstance(Class.java:308)
> at
>
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.setNestedResultMappingValue
> (BasicResultMap.java:395)
> at
>
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.applyNestedResultMap
> (BasicResultMap.java:369)
> at
>
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.setResultObjectValues
> (BasicResultMap.java:355)
> at
>
com.ibatis.sqlmap.engine.mapping.statement.RowHandlerCallback.handleResultObject
> (RowHandlerCallback.java:63)
> at
> com.ibatis.sqlmap.engine.execution.SqlExecutor.handleResults
> (SqlExecutor.java:395)
> at
> com.ibatis.sqlmap.engine.execution.SqlExecutor.executeQuery
> (SqlExecutor.java:185)
> at
>
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.sqlExecuteQuery
> (GeneralStatement.java:205)
> at
>
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback
> (GeneralStatement.java:173)
> 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)
> at SQLTest.main(SQLTest.java:27)
>
>
> Niels Beekman wrote:
> > How could iBATIS throw an InstantiationException when you're not even
> > telling it the name of your abstract class? Please post the full
> > exception stacktrace and your result maps.
> >
> > Niels
> >
> > -----Original Message-----
> > From: Kenny Pearce [mailto:[EMAIL PROTECTED]
> > Sent: woensdag 12 september 2007 20:46
> > To: user-java@ibatis.apache.org
> > Subject: abstract property
> >
> > Hello,
> > I am trying to use iBatis in a case where I have an object
> > hierarchy
> > like the following:
> >
> > class Foo{
> > String fooString;
> > Bar myBar;
> > //getters and setters omitted
> > }
> >
> > abstract class Bar{
> > String barString;
> > //getters and setters omitted
> > }
> >
> > class SubBar extends Bar{
> > String subBarString;
> > //getters and setters omitted
> > }
> >
> > I would like to be able to do this:
> >
> > <resultMap id="fooResultMap" class="Foo">
> > <result property="fooString" column="foo"/>
> > <result property="myBar" resultMap="barResultMap"/>
> > </resultMap>
> >
> > <resultMap id="barResultMap" class="SubBar">
> > <result property="barString" column="bar"/>
> > <result proprty="subBarString" column="sub_bar"/>
> > </resultMap>
> >
> > <select id="fooSelect" parameterClass="string" resultClass="Foo"
> > resultMap="fooResultMap">
> > SELECT foo, bar, sub_bar FROM table WHERE foo = #value#
> > </select>
> >
> > But that gives an InstantiationException (despite the fact that the
> > barResultMap has the class SubBar, which is concrete, specified). Next
I
> >
> > tried using a discriminator and making a separate barResultMap and
> > subBarResultMap (where subBarResultMap extends barResultMap) with
> > <subMap value="*" ...> on a column that is never null (I'm not sure if
> > wildcard is supported - I couldn't find discriminator in the docs, but
> > it's not listed on the undocumented features page). That still threw
an
> > exception. Next, I changed the select statement to (the equivalent
of):
> >
> > SELECT foo, bar, sub_bar, 1 as use_submap FROM table WHERE foo =
> > #value#
> >
> > and used:
> >
> > <discriminator column="use_submap" javaType="int">
> > <subMap value="1" resultMap="subBarResultMap"/>
> > </discriminator>
> >
> > But no go there either.
> >
> > Is there any way to do this, short of creating a custom object
factory?
> >
> > Thanks,
> >
>
> --
> Kenny Pearce
> Hx Technologies
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