https://stackoverflow.com/questions/23285809
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RussianI was missing this in the faces-config.xml file
<application>
<el-resolver>org.springframework.web.jsf.el.SpringBeanFacesELResolver</el-resolver>
</application>
Null pointer Exception on DAO call [duplicate]
Frage
This is not regarding any object or value being null.This is regarding some configuration issue which I am facing with the application. So it cannot be a possible duplicate of the question specified as duplicate. The issue I am facing is that while I am trying to make a simple example using JSF,Spring and hibernate. I am getting a null pointer exception when I make the hibernateDAO function call from the ExpenseForm class where I read all the variables from the jsf form. Below are my related code files.I am using Spring 3.0 and JSF 2.0 configurations.
ExpenseBean:
@Entity
@Table(name = "Expenses")
public class ExpenseBean implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private int food;
private int travel;
private int living;
@Id
@Column(name = "Food", nullable = false)
public int getFood() {
return food;
}
public void setFood(int food) {
this.food = food;
}
@Column(name = "Travel", nullable = false)
public int getTravel() {
return travel;
}
public void setTravel(int travel) {
this.travel = travel;
}
@Column(name = "Living", nullable = false)
public int getLiving() {
return living;
}
public void setLiving(int living) {
this.living = living;
}
}
ExpenseForm:
public class ExpenseForm {
private int food;
private int travel;
private int living;
private ConfigureExpenseDAO configureExpenseDAO;
public ConfigureExpenseDAO getConfigureExpenseDAO() {
return configureExpenseDAO;
}
public void setConfigureExpenseDAO(ConfigureExpenseDAO configureExpenseDAO) {
this.configureExpenseDAO = configureExpenseDAO;
}
public String addExpense() {
ExpenseBean expense = new ExpenseBean();
System.out.println(food);
expense.setFood(food);
expense.setLiving(living);
expense.setTravel(travel);
System.out.println(expense.getFood() + expense.getLiving());
/*line 33*/
configureExpenseDAO.saveExpenseDetails(food, living, travel);
return "index";
}
public int getFood() {
return food;
}
public void setFood(int food) {
this.food = food;
}
public int getTravel() {
return travel;
}
public void setTravel(int travel) {
this.travel = travel;
}
public int getLiving() {
return living;
}
public void setLiving(int living) {
this.living = living;
}
}
ConfigureExpenseDAOImpl:
@Repository("configureExpenseDAO")
public class ConfigureExpenseDAOImpl extends HibernateAbstractBase implements ConfigureExpenseDAO{
@Override
public void saveExpenseDetails(int food, int living, int travel) {
// TODO Auto-generated method stub
System.out.println("DAO");
ExpenseBean expense=new ExpenseBean();
expense.setFood(food);
expense.setLiving(living);
expense.setTravel(travel);
HibernateTemplate hTemp = getHibernateTemplate();
hTemp.saveOrUpdate(expense);
}
}
SessionFactory.xml
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<property name="annotatedClasses">
<list>
<value>com.src.jsfsample.model.ExpenseBean</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
<prop key="hibernate.show_sql">false</prop>
<!-- <prop key="hibernate.current_session_context_class">thread</prop> -->
</props>
</property>
</bean>
applicationContext.xml
<context:component-scan base-package="com.src.jsfsample"/>
<import resource="/SpringBeans/DataSource.xml"/>
<import resource="/SpringBeans/SessionFactory.xml"/>
faces-config.xml
<managed-bean>
<managed-bean-name>expenseForm</managed-bean-name>
<managed-bean-class>com.src.jsfsample.managedbean.ExpenseForm</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
<managed-property>
<property-name>configureExpenseDAO</property-name>
<value>#{configureExpenseDAO}</value>
</managed-property>
</managed-bean>
StackTrace:
20
40
SEVERE: Servlet.service() for servlet [Faces Servlet] in context with path [/JSFExample] threw exception [javax.el.ELException: java.lang.NullPointerException] with root cause
java.lang.NullPointerException
at com.src.jsfsample.managedbean.ExpenseForm.addExpense(ExpenseForm.java:33)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.el.parser.AstValue.invoke(AstValue.java:277)
at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:273)
at org.apache.myfaces.view.facelets.el.ContextAwareTagMethodExpression.invoke(ContextAwareTagMethodExpression.java:96)
at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:74)
at javax.faces.component.UICommand.broadcast(UICommand.java:120)
at javax.faces.component.UIViewRoot._broadcastAll(UIViewRoot.java:1172)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:365)
at javax.faces.component.UIViewRoot._process(UIViewRoot.java:1656)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:862)
at org.apache.myfaces.lifecycle.InvokeApplicationExecutor.execute(InvokeApplicationExecutor.java:42)
at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:196)
at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:143)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:196)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:357)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Lösung 2
Andere Tipps
Probably the property value of model ExpenseBean : food,travel,living is null. You should set value for them!
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