WebSphere Trace, Spring, commons ToStringBuilder, Hibernate, and LazyInitializationException

We've seen the exception below, because WebSphere diagnostics and tracing was enabled.
We disabled it by editing the logging properties from WebSphere console/Logs and Trace/select your server's/select Diagnostics Trace Server/Runtime/click Change Log Detail Levels, then editing logging information, and removing unneeded packages after "*=info:" ...

Stack trace:

[2009-07-23 15:56:10,078] WebContainer : 1651 org.hibernate.LazyInitializationException ERROR - could not initialize proxy - no Session
org.hibernate.LazyInitializationException: could not initialize proxy - no Session
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:86)
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:140)
at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:190)
at com.mycompany.myproject.domain.MyObject_$$_javassist_20.hashCode(MyObject_$$_javassist_20.java)
at org.apache.commons.lang.builder.HashCodeBuilder.append(HashCodeBuilder.java:452)
at org.apache.commons.lang.builder.HashCodeBuilder.reflectionAppend(HashCodeBuilder.java:413)
at org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode(HashCodeBuilder.java:379)
at org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode(HashCodeBuilder.java:155)
at com.mycompany.myproject.domain.DomainObject.hashCode(DomainObject.java:14)
at java.util.HashMap.hash(HashMap.java:324)
at java.util.HashMap.containsKey(HashMap.java:470)
at java.util.HashSet.contains(HashSet.java:207)
at org.apache.commons.lang.builder.ReflectionToStringBuilder.isRegistered(ReflectionToStringBuilder.java:135)
at org.apache.commons.lang.builder.ReflectionToStringBuilder.appendFieldsIn(ReflectionToStringBuilder.java:660)
at org.apache.commons.lang.builder.ReflectionToStringBuilder.toString(ReflectionToStringBuilder.java:867)
at org.apache.commons.lang.builder.ReflectionToStringBuilder.toString(ReflectionToStringBuilder.java:339)
at org.apache.commons.lang.builder.ReflectionToStringBuilder.toString(ReflectionToStringBuilder.java:173)
at org.apache.commons.lang.builder.ToStringBuilder.reflectionToString(ToStringBuilder.java:124)
at com.mycompany.myproject.domain.DomainObject.toString(DomainObject.java:24)
at java.lang.String.valueOf(String.java:1505)
at java.util.AbstractCollection.toString(AbstractCollection.java:469)
at com.ibm.ws.webcontainer.srt.SRTServletRequest.setAttribute(SRTServletRequest.java:488)
at org.springframework.web.servlet.view.AbstractView.exposeModelAsRequestAttributes(AbstractView.java:337)
at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:206)
at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:257)
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1183)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:902)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:807)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:511)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1095)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1036)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:118)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:87)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:832)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:679)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:565)
at com.ibm.ws.wswebcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:478)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:321)
at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:236)
at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:257)
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1183)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:902)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:807)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:511)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1095)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1036)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:145)
at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:119)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:55)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:186)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:130)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:87)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:832)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:679)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:565)
at com.ibm.ws.wswebcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:478)
at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:90)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:748)
at com.ibm.ws.wswebcontainer.WebContainer.handleRequest(WebContainer.java:1461)
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:118)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:458)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:387)
at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:102)
at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:136)
at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:195)
at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:743)
at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:873)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1473)

Analysis

It seems that enabling logging for the package com.ibm.ws.webcontainer causes WebSphere to log request attributes. During view rendering, the call to request.setAttribute(), in Spring's AbstractView.exposeModelAsRequestAttributes() , which is implemented by com.ibm.ws.webcontainer.srt.SRTServletRequest.setAttribute(), attempts to log model attributes by calling toString(). We add our domain objects as values for model attributes, and our DomainObject implements toString() using Apache commons ToStringBuilder, which recursively walks the whole object graph, causing all references to be initialized. This all happens outside the boundaries of a transaction, and hence we get the exception above for our lazily loaded references.

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