我试图将接缝组件注入另一个组件,然后自动创建它。但是由于某种原因,注入的接缝组件会抛出NPE。
XHTML
<a4j:commandLink id="cbrModal"
action="#{detailAction.showInformation(1L)}"
reRender="DetailModal"
limitToList="true">
<h:outputText value="text"/>
</a4j:commandLink>
DetailActionBean.java
@Name("detailAction")
public class DetailActionBean implements Serializable {
@In(create = true, required = false)
@Out(required = false)
private RulesValidator rulesValidator;
public void showInformation(long id) {
rulesValidator.setCheckCount(0); // rulesValidator == null here and throws npe
}
)
RulesValidator.java
@AutoCreate
@Name("rulesValidator")
@Scope(ScopeType.SESSION)
public class RulesValidator implements Serializable {
private int checkCount = 0;
public void setCheckCount(int checkCount) {
this.checkCount = checkCount;
}
}
最佳答案
Seam将扫描基本软件包并查找@Name组件,然后这些组件可以自动连线。我应该将seam.properties文件(空)放入seam中,以了解要扫描的基本软件包。我正在dint上工作的模块具有seam.properties,因此未对RulesValidator进行扫描并将其视为接缝组件。因此,autoCreate dint工作。