As referenced in the previous question , why does the @PostConstruct method not work?
glassfish gives:
INFO: MessageBean.. INFO: MessageBean.getModel.. INFO: SingletonNNTP.getMessages.. INFO: MessageBean.getModel.. INFO: SingletonNNTP.getMessages.. INFO: SingletonNNTP.setIndex..2,205 INFO: SingletonNNTP.setIndex..2,205 INFO: SingletonNNTP.setIndex..2,206 INFO: SingletonNNTP.setIndex..2,206 INFO: SingletonNNTP.setIndex..2,207 INFO: SingletonNNTP.setIndex..2,207 INFO: SingletonNNTP.setIndex..2,208 INFO: SingletonNNTP.setIndex..2,208 INFO: SingletonNNTP.setIndex..2,209 INFO: SingletonNNTP.setIndex..2,209 INFO: SingletonNNTP.setIndex..2,210 INFO: SingletonNNTP.setIndex..2,210 INFO: SingletonNNTP.setIndex..2,211 INFO: SingletonNNTP.setIndex..2,211 INFO: SingletonNNTP.setIndex..2,212 INFO: SingletonNNTP.setIndex..2,212 INFO: SingletonNNTP.setIndex..2,213 INFO: SingletonNNTP.setIndex..2,213 INFO: SingletonNNTP.setIndex..2,214 INFO: SingletonNNTP.setIndex..2,214 INFO: SingletonNNTP.setIndex..2,215 INFO: SingletonNNTP.setIndex..2,215 INFO: MessageBean.getModel.. INFO: SingletonNNTP.getMessages.. INFO: Detail.. WARNING: /foo/detail.xhtml @9,67 value="#{detail.id}": org.jboss.weld.exceptions.WeldException: WELD-000049 Unable to invoke [method] @PostConstruct public net.bounceme.dur.nntp.Detail.configBean() on net.bounceme.dur.nntp.Detail@c8e43a javax.el.ELException: /foo/detail.xhtml @9,67 value="#{detail.id}": org.jboss.weld.exceptions.WeldException: WELD-000049 Unable to invoke [method] @PostConstruct public net.bounceme.dur.nntp.Detail.configBean() on net.bounceme.dur.nntp.Detail@c8e43a at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:114) at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194) at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182) at javax.faces.component.UIOutput.getValue(UIOutput.java:169) at javax.faces.component.UIInput.validate(UIInput.java:972) at javax.faces.component.UIInput.executeValidate(UIInput.java:1233) at javax.faces.component.UIInput.processValidators(UIInput.java:698) at javax.faces.component.UIViewParameter.processValidators(UIViewParameter.java:273) at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1214) at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1214) at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:1172) at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:76) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593) at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1542) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161) at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231) at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317) at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195) at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:849) at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:746) at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1045) at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:228) at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90) at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79) at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54) at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59) at com.sun.grizzly.ContextTask.run(ContextTask.java:71) at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532) at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513) at java.lang.Thread.run(Thread.java:722) Caused by: org.jboss.weld.exceptions.WeldException: WELD-000049 Unable to invoke [method] @PostConstruct public net.bounceme.dur.nntp.Detail.configBean() on net.bounceme.dur.nntp.Detail@c8e43a at org.jboss.weld.bean.AbstractClassBean.defaultPostConstruct(AbstractClassBean.java:508) at org.jboss.weld.bean.ManagedBean$ManagedBeanInjectionTarget.postConstruct(ManagedBean.java:174) at org.jboss.weld.bean.ManagedBean.create(ManagedBean.java:291) at org.jboss.weld.context.AbstractContext.get(AbstractContext.java:107) at org.jboss.weld.bean.proxy.ContextBeanInstance.getInstance(ContextBeanInstance.java:90) at org.jboss.weld.bean.proxy.ProxyMethodHandler.invoke(ProxyMethodHandler.java:79) at net.bounceme.dur.nntp.Detail$Proxy$_$$_WeldClientProxy.getId(Detail$Proxy$_$$_WeldClientProxy.java) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at javax.el.BeanELResolver.getValue(BeanELResolver.java:363) at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176) at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203) at com.sun.el.parser.AstValue.getValue(AstValue.java:138) at com.sun.el.parser.AstValue.getValue(AstValue.java:183) at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:224) at org.jboss.weld.el.WeldValueExpression.getValue(WeldValueExpression.java:50) at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109) ... 38 more Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.jboss.weld.util.reflection.SecureReflections$13.work(SecureReflections.java:264) at org.jboss.weld.util.reflection.SecureReflectionAccess.run(SecureReflectionAccess.java:52) at org.jboss.weld.util.reflection.SecureReflectionAccess.runAsInvocation(SecureReflectionAccess.java:137) at org.jboss.weld.util.reflection.SecureReflections.invoke(SecureReflections.java:260) at org.jboss.weld.introspector.jlr.WeldMethodImpl.invoke(WeldMethodImpl.java:174) at org.jboss.weld.bean.AbstractClassBean.defaultPostConstruct(AbstractClassBean.java:506) ... 56 more Caused by: java.lang.NumberFormatException: null at java.lang.Integer.parseInt(Integer.java:454) at java.lang.Integer.parseInt(Integer.java:527) at net.bounceme.dur.nntp.Detail.configBean(Detail.java:29) ... 66 more INFO: Detail..
I got the best result before, in which the bean was created, but with default values and did not get URL parameters in time, so some fields were filled and some were not.
If my Java code is unclear, let me know how this is unclear. For example, I do not know how to parse strings in Integer better. See comments here .
package net.bounceme.dur.nntp; import java.io.Serializable; import java.util.logging.Level; import java.util.logging.Logger; import javax.annotation.PostConstruct; import javax.enterprise.context.ConversationScoped; import javax.inject.Named; import javax.mail.Message; @Named @ConversationScoped public class Detail implements Serializable { private static final long serialVersionUID = 1L; private static final Logger LOG = Logger.getLogger(Detail.class.getName()); private String id = null; private Message message = null; private SingletonNNTP nntp = SingletonNNTP.INSTANCE; private int forward = 0; private int back = 0; public Detail() { LOG.info("Detail.."); } @PostConstruct public void configBean() { int intId = Integer.parseInt(id); try { nntp.setIndex(intId); message = nntp.getMessage(); } catch (Exception ex) { LOG.info("Detail.configBean..failed to set message"); } setForward(intId + 1); setBack(intId - 1); } public Message getMessage() throws Exception { LOG.info("Detail.getMessage.." + getId()); return message; } public void setMessage(Message message) { LOG.info("Detail.setMessage.."); this.message = message; } public String getId() throws Exception { LOG.info("Detail.getId.." + id); if (id == null) {
and view:
<?xml version='1.0' encoding='UTF-8' ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:ui="http://java.sun.com/jsf/facelets" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html"> <body> <f:metadata> <f:viewParam name="id" id="id" value="#{detail.id}" /> </f:metadata> <ui:composition template="./complexTemplate.xhtml"> <ui:define name="top"> <div style="float: left"> <h:link value="back" outcome="detail" includeViewParams="true"> <f:param name="id" value="#{detail.back}"/> </h:link> </div> <div style="float: right"> <h:link value="forward" outcome="detail" includeViewParams="true"> <f:param name="id" value="#{detail.forward}"/> </h:link> </div> <p align="center"><h:outputText value="#{detail.message.messageNumber}" /></p> </ui:define> <ui:define name="left"> <h:outputText value="#{detail.message.sentDate}" /><p/> <h:outputText value="#{detail.message.subject}"/><p/> </ui:define> <ui:define name="right"> </ui:define> <ui:define name="content"> <h:outputText value="#{detail.message.content}" escape="false"/> </ui:define> <ui:define name="bottom"> </ui:define> </ui:composition> </body> </html>
I believe that getter / setter methods that take URL parameters as method arguments are called after @PostConstruct, which results in a bean in an undefined state. The bean was created, but the fields were not initialized with the values from the URL parameters. This does not mean that I know to determine whether the bean was initialized or not with the URL parameters.
I used to have a conclusion where it was clearer, but at the moment I can only generate this error.
For practical purposes, I just left and moved the contents of the @PostConstruct method to Detail.setId (String), which at least works. Looking at the oracle docs , I just don’t see it being directly considered, however, the implication I draw from these documents is to use the Converter, which was also proposed earlier.
I'm more curious than actually implementing the converter, as it just seems like a pretty complicated way to do a simple thing. However, does the “logic” in @PostConstruct rightly belong to the converter?
The above code is not the one I use, it is just for this question, so the "logic" does not work in the @PostConstruct method, but instead of the setId () method.