iBatis throws a NPE when performing a sub-select in a resultMap.
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Key: IBATIS-464
URL: https://issues.apache.org/jira/browse/IBATIS-464
Project: iBatis for Java
Issue Type: Bug
Components: SQL Maps
Affects Versions: 2.3.0, 2.2.0
Environment: WinXP, Java 1.5, originally discovered when moving to
Spring 2.0.6 (spring-ibatis depends on ibatis 2.3.0)
Reporter: Mitchell L. Waters III
Priority: Blocker
iBatis throws a NullPointerException when performing a sub-select in a
resultMap.
For some foo record in the DB, there are a variable number of comments. iBatis
allows the user to return an object that contains the information from the foo
table and return the list/array/collection of related items (comments in this
example) from a separate table that relate to the foo record, using a resultMap
like what is listed below.
<resultMap class="test.FooDto" id="fooResult">
<result property="foo" column="foo" />
<result property="bar" column="bar" />
<result property="comments" select="getCommentList" column="{foo=foo}"
/>
</resultMap>
This works without a hitch in iBatis 2.1.7. However when you attempt to do the
same in iBatis 2.2.0 or 2.3.0, you get a NPE (stack trace to follow). Digging
in a bit, it seems that the session returned to do the SessionScope that is
returned for the sub-select is different than that used to run the original
select (different than the behavior in 2.1.7) and that the
transaction/transaction manager for the new SessionScope object is null. It
ends up throwing when it attempts to start a new transaction for the
sub-select.
I originally saw this problem when updating my application to use Spring 2.0.6
(which uses iBatis 2.3.0 as a dependency of the spring-ibatis module), but upon
further investigation I was able to isolate it to being in the ibatis-sqlmap
module. I've since set up our project to use Spring 2.0.6 with an older version
(2.1.7) of iBatis, and this works fine. While testing the problem, we tested
iBatis 2.1.7, 2.2.0 and 2.3.0 with both Spring 1.2.9 and 2.0.6, and we only
experience the problem with iBatis 2.2.0 and 2.3.0.
Hopefully, this will be fixed but until then we will be sticking with 2.1.7.
Thank you,
Mitch Waters
org.springframework.jdbc.UncategorizedSQLException: SqlMapClient operation;
uncategorized SQLException for SQL []; SQL state [null]; error code [0];
--- The error occurred in test.xml.
--- The error occurred while applying a result map.
--- Check the complexResult.
--- Check the result mapping for the 'roles' property.
--- Cause: java.lang.NullPointerException; nested exception is
com.ibatis.common.jdbc.exception.NestedSQLException:
--- The error occurred in test.xml.
--- The error occurred while applying a result map.
--- Check the complexResult.
--- Check the result mapping for the 'roles' property.
--- Cause: java.lang.NullPointerException
Caused by: com.ibatis.common.jdbc.exception.NestedSQLException:
--- The error occurred in test.xml.
--- The error occurred while applying a result map.
--- Check the complexResult.
--- Check the result mapping for the 'roles' property.
--- Cause: java.lang.NullPointerException
at
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback(GeneralStatement.java:188)
at
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryForList(GeneralStatement.java:123)
at
com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:615)
at
com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:589)
at
com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForList(SqlMapSessionImpl.java:118)
at
org.springframework.orm.ibatis.SqlMapClientTemplate$3.doInSqlMapClient(SqlMapClientTemplate.java:269)
at
org.springframework.orm.ibatis.SqlMapClientTemplate.execute(SqlMapClientTemplate.java:194)
at
org.springframework.orm.ibatis.SqlMapClientTemplate.executeWithListResult(SqlMapClientTemplate.java:220)
at
org.springframework.orm.ibatis.SqlMapClientTemplate.queryForList(SqlMapClientTemplate.java:267)
at
org.springframework.orm.ibatis.SqlMapClientTemplate.queryForList(SqlMapClientTemplate.java:261)
at dbtest.UserDao.queryForList(UserDao.java:23)
at dbtest.UserDao.complexQuery(UserDao.java:14)
at dbtest.UserDaoTest.testGetComplexUserList(UserDaoTest.java:43)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java: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:164)
at junit.framework.TestCase.runBare(TestCase.java:130)
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:120)
at junit.framework.TestSuite.runTest(TestSuite.java:230)
at junit.framework.TestSuite.run(TestSuite.java:225)
at
org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
Caused by: java.lang.NullPointerException
at
com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.endTransaction(SqlMapExecutorDelegate.java:782)
at
com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.endTransaction(SqlMapSessionImpl.java:176)
at
com.ibatis.sqlmap.engine.impl.SqlMapClientImpl.endTransaction(SqlMapClientImpl.java:154)
at
com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.autoEndTransaction(SqlMapExecutorDelegate.java:883)
at
com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:622)
at
com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:589)
at
com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForList(SqlMapSessionImpl.java:118)
at
com.ibatis.sqlmap.engine.impl.SqlMapClientImpl.queryForList(SqlMapClientImpl.java:95)
at
com.ibatis.sqlmap.engine.mapping.result.loader.ResultLoader.getResult(ResultLoader.java:72)
at
com.ibatis.sqlmap.engine.mapping.result.loader.ResultLoader.loadResult(ResultLoader.java:59)
at
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.getNestedSelectMappingValue(BasicResultMap.java:502)
at
com.ibatis.sqlmap.engine.mapping.result.BasicResultMap.getResults(BasicResultMap.java:340)
at
com.ibatis.sqlmap.engine.execution.SqlExecutor.handleResults(SqlExecutor.java:381)
at
com.ibatis.sqlmap.engine.execution.SqlExecutor.handleMultipleResults(SqlExecutor.java:301)
at
com.ibatis.sqlmap.engine.execution.SqlExecutor.executeQuery(SqlExecutor.java:190)
at
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.sqlExecuteQuery(GeneralStatement.java:205)
at
com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback(GeneralStatement.java:173)
... 30 more
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