maybe a serialization error?

Hi all,
I have a strange problem using pgsql driver in my Tomcat 4.1 server. I have an object that manages my sql queries (simply put: it receives the sql expression, executes it and stores the resultset in a private variable). For some reason, if I get one of these objects of mine and set it as an page attribute in my tomcat application, the following error occurs when I try fetch data from it. Why? I guess it's a serialization issue, because I'm sure this query returns data...

java.lang.NullPointerException
at org.postgresql.jdbc2.AbstractJdbc2ResultSet.beforeFirst(AbstractJdbc2ResultSet.java:204)
at org.apache.commons.dbcp.DelegatingResultSet.beforeFirst(DelegatingResultSet.java:188)
at com.w2.infra.db.DbVector.first(DbVector.java:175)
at com.w2.infra.tags.logic.IterateTag.doTag(IterateTag.java:27)
at com.w2.infra.tags.Taglib.doStartTag(Taglib.java:116)
at org.apache.jsp.vest2_jsp._jspx_meth_w2_iterateTag_0(vest2_jsp.java:553)
at org.apache.jsp.vest2_jsp._jspx_meth_w2_beanLoaderTag_0(vest2_jsp.java:524)
at org.apache.jsp.vest2_jsp._jspService(vest2_jsp.java:238)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:210)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:432)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:356)
at com.w2.infra.mvc.FormHandler.redirectTo(FormHandler.java:102)
at com.w2.vest.forms.FormCadsVest.doForm(FormCadsVest.java:54)
at com.w2.infra.servlets.FormManager.service(FormManager.java:61)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at com.w2.infra.servlets.ErrorPageFilter.doFilter(ErrorPageFilter.java:25)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
at

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