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From Eduardo Piva <edua...@gwe.com.br>
Subject NullPointer with lazy-load.
Date Thu, 24 Feb 2005 21:24:42 GMT
Hello list,

I'm using iBatis with SpringFramework. I have an application that is
working fine today, but without lazy loading. If I enable lazy-load but
does not enable enhancements, it seems that lazy loading does not works,
because I can see the same number of selects going to my database.

If I enable both lazy-load and enhancements, there is just one select
going to my database, witch is correct, but when I try to access a field
of my bean, I get a NullPointerException. It seems that it's something
related to Transactions into a Session.

If I disable transaction in SpringFramework, I continue to have the same
error. Can someone help me? Here are my iBatis map and the error I get.

************** Settings ********************
<settings
		cacheModelsEnabled="true"
		enhancementEnabled="true"
		lazyLoadingEnabled="true"
		useStatementNamespaces="false"
	/>


********* User.xml Map, with some information ommited. *********
  <cacheModel id="userCache" type="MEMORY" readOnly="false">
	<flushInterval hours="24"/>
	<flushOnExecute statement="update-user-info"/>
	<flushOnExecute statement="insert-user"/>
	<property name="reference-type" value="WEAK"/>
  </cacheModel>

  <cacheModel id="roleCache" type="MEMORY" readOnly="false">
	<flushInterval hours="24"/>
	<flushOnExecute statement="insert-role"/>
	<flushOnExecute statement="remove-role"/>
	<property name="reference-type" value="WEAK"/>
  </cacheModel>

  <resultMap id="userResult" class="br.com.gwe.domain.User">
	<result property="login" column="username"/>
	<result property="name" column="name"/>
	<result property="telephone" column="telephone"/>
	<result property="celphone" column="celphone"/>
	<result property="roles" column="username" select="get-role"/>
  </resultMap>

  <resultMap id="roleResult" class="br.com.gwe.domain.Role">
	<result property="code" column="authority"/>
	<result property="description" column="description"/>
  </resultMap>

  <statement id="get-user-by-login" resultMap="userResult"
parameterClass="java.lang.String" cacheModel="userCache">
	select username, name, telephone, celphone from users where username =
#param#
  </statement>

  <statement id="get-role" resultMap="roleResult"
parameterClass="java.lang.String" cacheModel="roleCache">
	 select * from authorities, valid_authorities where username = #param#
and authorities.authority = valid_authorities.authority
  </statement>

************* Error *********************
java.lang.NullPointerException
	com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.endTransaction(SqlMapExecutorDelegate.java:776)
	com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.endTransaction(SqlMapSessionImpl.java:141)
	com.ibatis.sqlmap.engine.impl.SqlMapClientImpl.endTransaction(SqlMapClientImpl.java:114)
	com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.autoEndTransaction(SqlMapExecutorDelegate.java:860)
	com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:617)
	com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForList(SqlMapExecutorDelegate.java:584)
	com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForList(SqlMapSessionImpl.java:105)
	com.ibatis.sqlmap.engine.impl.SqlMapClientImpl.queryForList(SqlMapClientImpl.java:77)
	com.ibatis.sqlmap.engine.mapping.result.loader.ResultLoader.getResult(ResultLoader.java:72)
	com.ibatis.sqlmap.engine.mapping.result.loader.EnhancedLazyResultLoader$EnhancedLazyResultLoaderImpl.loadObject(EnhancedLazyResultLoader.java:130)
	com.ibatis.sqlmap.engine.mapping.result.loader.EnhancedLazyResultLoader$EnhancedLazyResultLoaderImpl.invoke(EnhancedLazyResultLoader.java:113)
	$java.util.List$$EnhancerByCGLIB$$7e9071fc.toString(<generated>)
	java.lang.String.valueOf(String.java:2131)
	java.lang.StringBuffer.append(StringBuffer.java:370)
	br.com.gwe.web.controller.UserController.formBackingObject(UserController.java:109)
	org.springframework.web.servlet.mvc.AbstractFormController.showNewForm(AbstractFormController.java:270)
	org.springframework.web.servlet.mvc.AbstractFormController.handleRequestInternal(AbstractFormController.java:240)
	org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:128)
	org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:44)
	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:522)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:321)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118)
	com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52)
	net.sf.acegisecurity.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:70)
	net.sf.acegisecurity.intercept.web.SecurityEnforcementFilter.doFilter(SecurityEnforcementFilter.java:169)
	net.sf.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:105)
	net.sf.acegisecurity.ui.AbstractIntegrationFilter.doFilter(AbstractIntegrationFilter.java:170)
	net.sf.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:105)
	net.sf.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:333)
	net.sf.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:105)

If you need more information, just ask me that I can provide it. I've
ommited a lot of XML, since it is a full application and it would flood
this email.

-- 
Eduardo Piva
GWE Software
+55 (19) 3254-7633
+55 (19) 8114-9488
www.gwe.com.br



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