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Posted to dev@commons.apache.org by bu...@apache.org on 2004/12/12 06:54:18 UTC
DO NOT REPLY [Bug 32653] New: -
Beans and Maps mixed up in PropertyUtils.
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http://issues.apache.org/bugzilla/show_bug.cgi?id=32653
Summary: Beans and Maps mixed up in PropertyUtils.
Product: Commons
Version: Nightly Builds
Platform: All
OS/Version: All
Status: NEW
Severity: major
Priority: P2
Component: Bean Utilities
AssignedTo: commons-dev@jakarta.apache.org
ReportedBy: dakota.jack@gmail.com
CC: dakota.jack@gmail.com
If we want to use BeanUtils to populate a bean, which we do in Struts with an
ActionForm, for example, and want to use the same bean to deliver data to a view
in an MVC framework, which we also do in Struts, again with an ActionForm, we
cannot do so by making the bean implement a Map. The reason is that
PropertyUtils automagically treats Maps in a way that won't allow us to populate
a bean that implements a map.
This is a serious design flaw, I think, in beanutils. One should be able to use
the utilites to both populate a bean and to use the same object to deliver data
to a view as a map. The offending code "works", I think, as follows: when you
want to populate a bean with BeanUtils (BeanUtilsBean) it hands the bean off to
PropertyUtils (PropertyUtilsBean). However, if PropertyUtils "discovers" that
the bean is a map, then population fails. I am not 100% certain that this is
correct, but it sure looks that way.
I think that the inability to populate beans that implements maps is unnecessary
and a design flaw severely limiting the use of beanutils.
Here is what happens with Struts, for example, if an ActionForm bean implements
a Map and the Struts controller attempts to populate the ActionForm bean:
java.lang.IllegalArgumentException: Null property value for 'submit'
at
org.apache.commons.beanutils.PropertyUtils.getNestedProperty(PropertyUtils.java:755)
at org.apache.commons.beanutils.PropertyUtils.getProperty(PropertyUtils.java:801)
at org.apache.commons.beanutils.BeanUtils.setProperty(BeanUtils.java:881)
at org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:808)
at org.apache.struts.util.RequestUtils.populate(RequestUtils.java:495)
at
org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:798)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:205)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:415)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:284)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
at com.crackwillow.filter.GZIPFilter.doFilter(GZIPFilter.java:19)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:233)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:204)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:257)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
at
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:245)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:199)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:184)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:164)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:156)
at
org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:567)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:206)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:833)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:732)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:619)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:688)
at java.lang.Thread.run(Thread.java:534)
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