Re: Lazy loader throwing NPE

reuben Wed, 19 Oct 2005 19:16:16 -0700

Sure. I can't do this via the BeanFactory (this is a standalone jar) so I've been doing it in code as either one of the following to wrap the DAO in transactions:

Configuration 1:

Code:

Properties p = new Properties();
p.setProperty("create*", "ISOLATION_REPEATABLE_READ");
p.setProperty("update*", "ISOLATION_REPEATABLE_READ");
p.setProperty("remove*", "ISOLATION_REPEATABLE_READ");
p.setProperty("*", "PROPAGATION_REQUIRED,readOnly");

TransactionProxyFactoryBean tpfb = new TransactionProxyFactoryBean();
tpfb.setTransactionManager(new DataSourceTransactionManager(ds));
tpfb.setTransactionAttributes(p);
tpfb.setTarget(new DeploymentDaoIbatis(ds));
tpfb.afterPropertiesSet();
return (DeploymentDao) tpfb.getObject();

Configuration 2:

Code:

Properties p = new Properties();
p.setProperty("create*", "ISOLATION_REPEATABLE_READ");
p.setProperty("update*", "ISOLATION_REPEATABLE_READ");
p.setProperty("remove*", "ISOLATION_REPEATABLE_READ");
p.setProperty("*", "PROPAGATION_REQUIRED,readOnly");

ProxyFactory pf = new ProxyFactory();
pf.addInterface(DeploymentDao.class);
pf.setTarget(new DeploymentDaoIbatis(ds));

TransactionInterceptor ti = new TransactionInterceptor();
ti.setTransactionAttributes(p);
ti.setTransactionManager(new DataSourceTransactionManager(ds));
pf.addAdvisor(new TransactionAttributeSourceAdvisor(ti));
return (DeploymentDao) pf.getProxy();

However, why do you think this has anything to do with the Spring transactions? From the Ibatis source code, it seems that calling:

SqlMapClient smc = SqlMapClientBuilder.buildSqlMapClient(new
InputStreamReader(

leads to a txManager never being initted on SQLMapExecutorDelegate. Is there another call that I'm supposed to be making?

Thanks
Reuben

Geoff Chiang wrote:

Can you post your Spring configuration for the relevant beans?


Geoff

--- [EMAIL PROTECTED] wrote:

If I turn lazy loading on, it is throwing an NPE from one specific
sqlmaps
query. The other queries & inserts work correctly.

When I posted this problem last week, I misdirected attention by
theorizing that this had something to do with the fact that I'm using
spring transactions; I'm pretty sure it doesn't:

The stacktrace is:

com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.endTransaction(SqlMapExecutorDelegate.java:776)

at

com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.endTransaction(SqlMapSessionImpl.java:137)

at

com.ibatis.sqlmap.engine.impl.SqlMapClientImpl.endTransaction(SqlMapClientImpl.java:115)

at

com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.autoEndTransaction(SqlMapExecutorDelegate.java:860)

at

com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:617)

at

com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:584)

at

com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForList(SqlMapSessionImpl.java:101)

at

com.ibatis.sqlmap.engine.impl.SqlMapClientImpl.queryForList(SqlMapClientImpl.java:7Cool

at

com.ibatis.sqlmap.engine.mapping.result.loader.ResultLoader.getResult(ResultLoader.java:72)

at

com.ibatis.sqlmap.engine.mapping.result.loader.LazyResultLoader.loadObject(LazyResultLoader.java:9Cool

at

com.ibatis.sqlmap.engine.mapping.result.loader.LazyResultLoader.invoke(LazyResultLoader.java:81)

at $Proxy1.toArray(Unknown Source)

At this point in the code, it is doing:

txManager.end(session);

txManager is, obviously, a TransactionManager; it is only built,
apparently, from the constructor of SqlMapConfigParser.


To initialize, I do, in the constructor of my class which extends
SqlMapClientDaoSupport:

        super.setDataSource(ds);
        SqlMapClient smc = SqlMapClientBuilder.buildSqlMapClient(new
InputStreamReader(

Config.getClasspathResource("classpath:.../ibatisSQLMapsConfig.xml").getInputStream()));

        super.setSqlMapClient(smc);


SqlMapClientBuilder.buildSqlMapClient(...)

calls:

  return new SqlMapConfigParser().parse(reader);

The constructor with no arguments is as follows:

  public SqlMapConfigParser() {
    this(null, null);
  }

However, line 272 of SqlMapConfigParser is never reached:

  vars.client.getDelegate().setTxManager(txManager);

In fact, the process(Node node) method that it is wrapped in is never
invoked; I don't have the source for NodeletParser handy, so I can't
see
why it is failing. I can look into this further if this problem is
not
reproducible by the devs.

Am I missing something from my setup, or this a bug in Ibatis?

Thanks




		
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Re: Lazy loader throwing NPE

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