{"id":1141,"date":"2012-04-05T10:49:00","date_gmt":"2012-04-05T10:49:00","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/2012\/10\/5-useful-methods-jsf-developers-should-know.html"},"modified":"2014-11-27T21:34:49","modified_gmt":"2014-11-27T19:34:49","slug":"5-useful-methods-jsf-developers-should","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2012\/04\/5-useful-methods-jsf-developers-should.html","title":{"rendered":"5 useful methods JSF developers should know"},"content":{"rendered":"
The aim of this post is a summary about some handy methods for JSF developers they can use in their day-to-day work. An utility class is a good place to put all methods together. I would call such class FacesAccessor. The first method is probably the most used one. It returns managed bean by the given name. <\/p>\n

The bean must be registered either per faces-config.xml or annotation. Injection is good, but sometimes if beans are rare called, it’s not necessary to inject beans into each other.
\n 
\n 
\n <\/p>\n

public static Object getManagedBean(final String beanName) {\r\n    FacesContext fc = FacesContext.getCurrentInstance();\r\n    Object bean;\r\n    \r\n    try {\r\n        ELContext elContext = fc.getELContext();\r\n        bean = elContext.getELResolver().getValue(elContext, null, beanName);\r\n    } catch (RuntimeException e) {\r\n        throw new FacesException(e.getMessage(), e);\r\n    }\r\n\r\n    if (bean == null) {\r\n        throw new FacesException(\"Managed bean with name '\" + beanName\r\n            + \"' was not found. Check your faces-config.xml or @ManagedBean annotation.\");\r\n    }\r\n\r\n    return bean;\r\n}\r\n<\/pre>\n
Using: <\/u><\/p>\n
@ManagedBean\r\npublic class PersonBean {\r\n    ...\r\n}\r\n\r\nPersonBean personBean = (PersonBean)FacesAccessor.getManagedBean(\"personBean\");\r\n\r\n\/\/ do something with personBean\r\n<\/pre>\n
The second method is useful for JSF component developers and everyone who would like to evaluate the given value expression #{…} and sets the result to the given value.  <\/p>\n
public static void setValue2ValueExpression(final Object value, final String expression) {\r\n    FacesContext facesContext = FacesContext.getCurrentInstance();\r\n    ELContext elContext = facesContext.getELContext();\r\n\r\n    ValueExpression targetExpression = \r\n        facesContext.getApplication().getExpressionFactory().createValueExpression(elContext, expression, Object.class);\r\n    targetExpression.setValue(elContext, value);\r\n}\r\n<\/pre>\n
Using: <\/u>
\nI personally use this method for the “log off functionality”. After an user is logged off, he\/she will see a special “logoff page”. The “logoff page” uses user settings (e.g. theme, language, etc.) from a sesion scoped bean. But this session scoped bean doesn’t exist more because the session was invalidated. What to do? Here is the code snippet from my logout method. 
 
<\/div> <\/div><\/p>\n
UserSettings userSettings = (UserSettings) FacesAccessor.getManagedBean(\"userSettings\");\r\n\r\n\/\/ invalidate session\r\nExternalContext ec = FacesContext.getCurrentInstance().getExternalContext();\r\nHttpSession session = (HttpSession) ec.getSession(false);\r\nsession.invalidate();\r\n\r\n\/\/ create new session\r\n((HttpServletRequest) ec.getRequest()).getSession(true);\r\n\r\n\/\/ restore last used user settings because login \/ logout pages reference \"userSettings\"\r\nFacesAccessor.setValue2ValueExpression(userSettings, \"#{userSettings}\");\r\n\r\n\/\/ redirect to the specified logout page\r\nec.redirect(ec.getRequestContextPath() + \"\/views\/logout.jsf\");\r\n<\/pre>\n
The third method maps a variable to the given value expression #{…}. It uses javax.el.VariableMapper to assign the expression to the specified variable, so that any reference to that variable will be replaced by the expression in EL evaluations.  <\/p>\n
public static void mapVariable2ValueExpression(final String variable, final String expression) {\r\n    FacesContext facesContext = FacesContext.getCurrentInstance();\r\n    ELContext elContext = facesContext.getELContext();\r\n    \r\n    ValueExpression targetExpression =\r\n        facesContext.getApplication().getExpressionFactory().createValueExpression(elContext, expression, Object.class);\r\n    elContext.getVariableMapper().setVariable(variable, targetExpression);\r\n}\r\n<\/pre>\n
Using: <\/u>
\nAssume, “PersonBean” is a managed bean having “name” attribute and “PersonsBean” is a bean holding many instances of “PersonBean” (as array, collection or map). The following code allows to use “personBean” as a reference to a specific bean with “name” Oleg. <\/p>\n
FacesAccessor.mapVariable2ValueExpression(\"personBean\", \"#{personsBean.person['Oleg']}\");\r\n<\/pre>\n
In a facelets page, say so, personDetail.xhtml, we can write: <\/p>\n
<html xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\"\r\n      xmlns:ui=\"http:\/\/java.sun.com\/jsf\/facelets\"\r\n      xmlns:h=\"http:\/\/java.sun.com\/jsf\/html\">\r\n<ui:composition>\r\n    ...\r\n    <h:inputText value=\"#{personBean.name}\"\/>\r\n    ...\r\n<\/ui:composition>\r\n<\/html>\r\n<\/pre>\n
Note, the reference “personBean” was set in Java. This mapping can be also used in facelets in declarative way via ui:include \/ ui:param. <\/p>\n
<html xmlns=\"http:\/\/www.w3.org\/1999\/xhtml\"\r\n      xmlns:ui=\"http:\/\/java.sun.com\/jsf\/facelets\">\r\n<ui:composition>\r\n    ...\r\n    <ui:include src=\"personDetail.xhtml\">\r\n        <ui:param name=\"personBean\" value=\"#{personsBean.person['Oleg']}\"\/>\r\n    <\/ui:include>\r\n    ...\r\n<\/ui:composition>\r\n<\/html>\r\n<\/pre>\n
The next two methods are used to create MethodExpression \/ MethodExpressionActionListener programmatically. They are handy if you use component binding via “binding” attribute or create some model classes in Java. <\/p>\n
public static MethodExpression createMethodExpression(String valueExpression,\r\n                                                      Class<?> expectedReturnType,\r\n                                                      Class<?>[] expectedParamTypes) {\r\n    MethodExpression methodExpression = null;\r\n    try {\r\n        FacesContext fc = FacesContext.getCurrentInstance();\r\n        ExpressionFactory factory = fc.getApplication().getExpressionFactory();\r\n        methodExpression = factory.\r\n            createMethodExpression(fc.getELContext(), valueExpression, expectedReturnType, expectedParamTypes);\r\n    } catch (Exception e) {\r\n        throw new FacesException(\"Method expression '\" + valueExpression + \"' could not be created.\");\r\n    }\r\n    \r\n    return methodExpression;\r\n}\r\n\r\npublic static MethodExpressionActionListener createMethodActionListener(String valueExpression,\r\n                                                                        Class<?> expectedReturnType,\r\n                                                                        Class<?>[] expectedParamTypes) {\r\n    MethodExpressionActionListener actionListener = null;\r\n    try {\r\n        actionListener = new MethodExpressionActionListener(createMethodExpression(\r\n            valueExpression, expectedReturnType, expectedParamTypes));\r\n    } catch (Exception e) {\r\n        throw new FacesException(\"Method expression for ActionListener '\" + valueExpression\r\n                          + \"' could not be created.\");\r\n    }\r\n\r\n    return actionListener;\r\n}\r\n\r\n<\/pre>\n
Using: <\/u>
\nIn one of my projects I have created PrimeFaces MenuModel with menu items programmatically. <\/p>\n
MenuItem mi = new MenuItem();\r\nmi.setAjax(true);\r\nmi.setValue(...);\r\nmi.setProcess(...);\r\nmi.setUpdate(...);\r\nmi.setActionExpression(FacesAccessor.createMethodExpression(\r\n    \"#{navigationContext.setBreadcrumbSelection}\", String.class, new Class[] {}));\r\n\r\nUIParameter param = new UIParameter();\r\nparam.setId(...);\r\nparam.setName(...);\r\nparam.setValue(...);\r\nmi.getChildren().add(param);\r\n<\/pre>\n
Do you have nice methods you want to share here? Tips \/ tricks are welcome.   <\/p>\n
Reference: <\/i><\/strong>5 useful methods JSF developers should know  <\/a> from our JCG partner<\/a> Oleg Varaksin at the Thoughts on software development<\/a> blog. <\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
The aim of this post is a summary about some handy methods for JSF developers they can use in their day-to-day work. An utility class is a good place to put all methods together. I would call such class FacesAccessor. The first method is probably the most used one. It returns managed bean by the …<\/p>\n","protected":false},"author":200,"featured_media":174,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[293],"class_list":["post-1141","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-jsf"],"yoast_head":"\n5 useful methods JSF developers should know - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"The aim of this post is a summary about some handy methods for JSF developers they can use in their day-to-day work. 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