{"id":2429,"date":"2017-06-12T17:04:40","date_gmt":"2017-06-12T15:04:40","guid":{"rendered":"http:\/\/hasselba.ch\/blog\/?p=2429"},"modified":"2017-06-12T17:05:56","modified_gmt":"2017-06-12T15:05:56","slug":"quick-n-dirty-hotfix-for-datetimehelper","status":"publish","type":"post","link":"https:\/\/hasselba.ch\/blog\/?p=2429","title":{"rendered":"Quick-n-Dirty: Hotfix for DateTimeHelper"},"content":{"rendered":"

This weekend I stumbled over a bug of the DateTimeHelper<\/em>: If the value of the field is empty, no actions and\/or action listeners connected with a managed bean will be executed anymore.<\/p>\n

Here is an example of a small XPage to illustrate the problem:<\/p>\n

<?xml version=\"1.0\" encoding=\"UTF-8\"?><?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n<xp:view xmlns:xp=\"http:\/\/www.ibm.com\/xsp\/core\">\r\n \r\n    <xp:label \r\n        value=\"#{javascript:java.lang.System.currentTimeMillis()}\" id=\"labelNow\" \/>\r\n\r\n     <xp:inputText id=\"inputTextDT\" value=\"#{myBean.valueDT}\">\r\n         <xp:this.converter>\r\n             <xp:convertDateTime type=\"date\" \/>\r\n         <\/xp:this.converter>\r\n         <xp:dateTimeHelper \/>\r\n     <\/xp:inputText>\r\n\r\n    <xp:button id=\"button\" value=\"OK\">\r\n        <xp:eventHandler\r\n            event=\"onclick\"\r\n            submit=\"true\"\r\n            refreshMode=\"partial\"\r\n            refreshId=\"labelNow\"\r\n            actionListener=\"#{myBean.action}\" \/>\r\n     <\/xp:button>\r\n\r\n<\/xp:view><\/code><\/pre>\n
It does not matter if you set the disableValidators<\/em> property for the text field to true<\/em>, even an immediate=true<\/em> won’t help here. The reason for the problem is that the renderer of the dateTimeHelper\u00a0<\/em>always uses the attached converter and fails with a null pointer exception if the value is empty (this infringes the JSF specification, but IBM has implemented it this way).<\/p>\n
The workaround for this problem is to overwrite the existing renderer class and handle the NPE by yourself:<\/p>\n
package ch.hasselba.xpages.renderer;\r\n\r\nimport javax.faces.component.UIComponent;\r\nimport javax.faces.context.FacesContext;\r\nimport javax.faces.convert.ConverterException;\r\npublic class DateTimeHelperRenderer\r\n    extends com.ibm.xsp.renderkit.dojo.DateTimeHelperRenderer{\r\n\r\n\u00a0\u00a0\u00a0 public Object getConvertedValue(FacesContext fc, UIComponent uiComponent, Object obj)\r\n    \u00a0 \u00a0 throws ConverterException\u00a0 {\r\n\r\n         \u00a0Object result = super.getConvertedValue(fc, uiComponent, obj);\r\n\r\n         \u00a0if( result == null )\r\n           \u00a0return new Object();\r\n\r\n       \u00a0 \u00a0return result;\r\n  \u00a0 }\r\n}<\/code><\/pre>\n
The renderer must now be registered in faces-config.xml<\/em>:<\/p>\n
<?xml version=\"1.0\" encoding=\"UTF-8\"?><?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n<faces-config>\r\n  <render-kit>\r\n    <renderer>\r\n      <component-family>javax.faces.Input<\/component-family>\r\n      <renderer-type>com.ibm.xsp.DateTimeHelper<\/renderer-type>\r\n      <renderer-class>ch.hasselba.xpages.renderer.DateTimeHelperRenderer<\/renderer-class>\r\n    <\/renderer>\r\n  <\/render-kit>\r\n<\/faces-config>\r\n<\/code><\/pre>\n
Now the problem is solved, the managed bean’s action get executed even if the value is empty.<\/p>\n","protected":false},"excerpt":{"rendered":"
This weekend I stumbled over a bug of the DateTimeHelper: If the value of the field is empty, no actions and\/or action listeners connected with a managed bean will be executed anymore. Here is an example of a small XPage … Weiterlesen →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[89,26,74],"tags":[47,15,7,31,86,3],"class_list":["post-2429","post","type-post","status-publish","format-standard","hentry","category-java","category-jsf","category-xpages","tag-9-0","tag-bug","tag-domino","tag-java","tag-jsf","tag-xpages"],"_links":{"self":[{"href":"https:\/\/hasselba.ch\/blog\/index.php?rest_route=\/wp\/v2\/posts\/2429","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hasselba.ch\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hasselba.ch\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hasselba.ch\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hasselba.ch\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2429"}],"version-history":[{"count":5,"href":"https:\/\/hasselba.ch\/blog\/index.php?rest_route=\/wp\/v2\/posts\/2429\/revisions"}],"predecessor-version":[{"id":2435,"href":"https:\/\/hasselba.ch\/blog\/index.php?rest_route=\/wp\/v2\/posts\/2429\/revisions\/2435"}],"wp:attachment":[{"href":"https:\/\/hasselba.ch\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2429"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hasselba.ch\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2429"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hasselba.ch\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2429"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}