我有一个Ajax发布请求表单* input_graph.xhtml *由View作用域bean InputTablePlot.java 支持，我有一个应用程序作用域bean，其中eager = true，它创建了一个应用程序启动时的连接池。我已将此应用程序作用域bean注入InputTablePlot中的托管属性，并从中检索连接对象。连接池在部分提交中可用，但在提交方法中为NULL，通过单击命令按钮“Plot”调用该方法。
Input.xhtml
<?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"
xmlns:p="http://primefaces.org/ui">
<f:view contentType="text/html">
<h:head>
</h:head>
<h:body>
<h:panelGroup id="container" style="background-color: white"
layout="block">
<h:panelGroup id="center" class="column" layout="block">
<h:form>
<p:messages id="validations" />
<p:panelGrid columns="2" styleClass="panelgrid">
<h:outputLabel for="ip" value="Source:"></h:outputLabel>
<p:selectManyMenu id="ip" value="#{inputTablePlot.ipAddress}"
required="true" requiredMessage="Enter Source">
<f:selectItems value="#{inputTablePlot.ipAddressList}" />
<p:ajax listener="#{inputTablePlot.populateDstn}" event="change"
update="dstn" process="@this"/>
</p:selectManyMenu>
<h:outputLabel for="dstn" value="Destination:"></h:outputLabel>
<p:selectManyMenu id="dstn" value="#{inputTablePlot.m_destination}"
required="true" requiredMessage="Enter Destination">
<f:selectItems value="#{inputTablePlot.m_destinationMenu}" />
</p:selectManyMenu>
<h:outputLabel for="start_date">Start Date/Time:</h:outputLabel>
<p:calendar id="start_date" value="#{inputTablePlot.startDtTime}"
navigator="true" pattern="MM/dd/yyyy hh:mm:ss a" required="true"
requiredMessage="Enter Start Date/Time" effect="fadeIn">
</p:calendar>
<h:outputLabel for="stop_date">Stop Date/Time:</h:outputLabel>
<p:calendar id="stop_date" value="#{inputTablePlot.stopDtTime}"
navigator="true" pattern="MM/dd/yyyy hh:mm:ss a" required="true"
requiredMessage="Enter Stop Date/Time" effect="fadeIn">
</p:calendar>
<h:outputLabel>Period:</h:outputLabel>
<p:selectOneMenu value="#{inputTablePlot.selPeriodType}"
required="true" requiredMessage="Enter Period">
<f:selectItems value="#{inputTablePlot.periodType}" />
<p:ajax listener="#{inputTablePlot.modifyperiod}" event="change"
process="@this" partialSubmit="true"/>
</p:selectOneMenu>
<p:inputText id="txt1" value="#{inputTablePlot.period}" />
<p:slider for="txt1" id="slider"/>
<h:commandButton value="Plot" action="#{inputTablePlot.submit}"
styleClass="button" id="bt2"></h:commandButton>
<h:commandButton value="Clear" action="#{inputTablePlot.clear}"
styleClass="button"></h:commandButton>
</p:panelGrid>
<p:defaultCommand target="bt2" />
</h:form>
</h:panelGroup>
</h:panelGroup>
</h:body>
</f:view>
</html>
InputTablePlot.java
@ManagedBean
@ViewScoped
public class InputTablePlot implements Serializable
{
private List<Long> m_ipAddress;
private Map<String, Long> m_ipAddrMenu;
private List<Long> m_destination;
private Map<String, Long> m_destinationMenu;
private List<Long> m_ssrc;
private Map<String, Long> m_ssrcMenu;
private Date m_startDtTime;
private Date m_stopDtTime;
private int m_period;
private List<String> m_periodType;
private String m_selectedPrdType;
@ManagedProperty("#{analyzerUIDatabase}")
private transient AnalyzerUIDatabase m_analyzerUIDatabase;
private List<List<PeriodStats>> m_results;
private StringBuilder m_query;
public InputTablePlot()
{
m_ipAddrMenu = new LinkedHashMap<String, Long>();
m_destinationMenu = new LinkedHashMap<String, Long>();
m_periodType = new ArrayList<String>();
m_results = new ArrayList<List<PeriodStats>>();
m_period = 10;
m_query = new StringBuilder();
}
@PostConstruct
public void init()
{
m_ipAddrMenu.clear();// Removing existing sources
m_destinationMenu.clear();// Removing existing destinations
m_periodType.clear();// Removing existing period types
m_periodType.add("Seconds");
m_periodType.add("Minutes");
m_periodType.add("Hours");
m_periodType.add("Days");
try
{
Connection m_connection = null;
ResultSet m_rs = null;
PreparedStatement m_pst_query = null;
m_query.setLength(0);
m_connection = m_analyzerUIDatabase.getConnection();
//process query
m_pst_query = m_connection.prepareStatement(m_query.toString());
m_rs = m_pst_query.executeQuery();
while (m_rs.next())
{
m_ipAddrMenu.put(ipLongToString(m_rs.getLong("IPADDRESS")), m_rs.getLong("IPADDRESS"));
}
m_rs.close();
m_query.setLength(0);
m_pst_query.close();
m_connection.close();
}
catch (SQLException e)
{
e.printStackTrace();
}
}
> //Getters and Setters
public String submit()
{
System.out.println("In Submit >>>>>>>> ");
log(m_analyzerUIDatabase); // <--
> Returning NULL
log(m_startDtTime);
log(m_stopDtTime);
log(m_selectedPrdType);
log(m_period);
log(m_ipAddress);
log(m_destination);
if (m_startDtTime.after(m_stopDtTime))
{
FacesContext facesContext = FacesContext.getCurrentInstance();
FacesMessage facesMessage = new FacesMessage("Stop Date/Time should be after Start Date/Time");
facesContext.addMessage("tableplot:validations", facesMessage);
return "FAILURE";
}
else if (m_selectedPrdType.equalsIgnoreCase("Seconds") && m_period < 10)
{
FacesContext facesContext = FacesContext.getCurrentInstance();
FacesMessage facesMessage = new FacesMessage("Minimum Period in Seconds is 10");
facesContext.addMessage("tableplot:validations", facesMessage);
return "FAILURE";
}
else
{
Connection m_connection = null;
ResultSet m_rs = null;
PreparedStatement m_pst_query = null;
for (int i = 0; i < m_ipAddress.size(); i++)
{
// Execute some logic
Flash flash = FacesContext.getCurrentInstance().getExternalContext().getFlash();
flash.put("m_results", m_results);
flash.put("resultJSON", resultJSON);
return "SUCCESS";
}
}
public void populateDstn()
{
System.out.println("ipaddr : " + this.m_ipAddress);
Connection m_connection = null;
ResultSet m_rs = null;
PreparedStatement m_pst_query = null;
try
{
m_destinationMenu.clear();
m_connection = m_analyzerUIDatabase.getConnection();
//execute some logic
m_rs.close();
m_query.setLength(0);
ipAddress.setLength(0);
m_pst_query.close();
m_connection.close();
}
catch (SQLException e)
{
FacesContext.getCurrentInstance().addMessage("tableplot:validations", new FacesMessage("Problem fetching Destinations"));
e.printStackTrace();
}
}
private void log(Object object)
{
String methodName = Thread.currentThread().getStackTrace()[2].getMethodName();
System.out.println("MyBean " + methodName + ": " + object);
}
}
栈跟踪
START PHASE RESTORE_VIEW 1
userAgent ::: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.72 Safari/537.36 accept :: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
userAgent ::: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.72 Safari/537.36 accept :: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
userAgent ::: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.72 Safari/537.36 accept :: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
END PHASE RESTORE_VIEW 1
START PHASE APPLY_REQUEST_VALUES 2
END PHASE APPLY_REQUEST_VALUES 2
START PHASE PROCESS_VALIDATIONS 3
MyBean getIpAddress: [168821850]
MyBean getIpAddress: [168821850]
MyBean getM_destination: null
MyBean getM_destination: null
END PHASE PROCESS_VALIDATIONS 3
START PHASE UPDATE_MODEL_VALUES 4
MyBean setIpAddress: [168821850]
MyBean setM_destination: [168821876]
END PHASE UPDATE_MODEL_VALUES 4
START PHASE INVOKE_APPLICATION 5
In Submit >>>>>>>>
MyBean submit: null
MyBean submit: Wed Jul 17 00:00:00 CDT 2013
MyBean submit: Fri Jul 19 00:00:00 CDT 2013
MyBean submit: Seconds
MyBean submit: 10
MyBean submit: [168821850]
MyBean submit: [168821876]
java.lang.NullPointerException
at com.InputTablePlot.submit(InputTablePlot.java:298)
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 com.sun.el.parser.AstValue.invoke(AstValue.java:234)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
at javax.faces.component.UICommand.broadcast(UICommand.java:315)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
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.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:681)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:452)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:138)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:564)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:213)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1083)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:379)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:175)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1017)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:136)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:445)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:260)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:225)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.run(AbstractConnection.java:358)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:596)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:527)
at java.lang.Thread.run(Thread.java:722)
END PHASE INVOKE_APPLICATION 5
START PHASE RENDER_RESPONSE 6
MyBean getIpAddress: [168821850]
MyBean getIpAddress: [168821850]
MyBean getM_destination: [168821876]
MyBean getM_destination: [168821876]
END PHASE RENDER_RESPONSE 6