action="#{languageFrom.showChoice}": Target Unreachable, identifier 'languageFrom' resolved to null
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package yingServlet;
import javax.faces.bean.ManagedBean; //记得不是import javax.annotation.ManagedBean;
@ManagedBean
public class LanguageForm {
private String language ;
public String getLanguage() {
return language;
}
public void setLanguage(String language) {
this.language = language.trim() ;
}
public String showChoice() {
if (isMissing(language)) {
return "missing-language" ;
}
else if (language.equalsIgnoreCase("Java")
|| language.equalsIgnoreCase("Groovy")) {
return "good-language" ;
}
else {
return "bad-language" ;
}
}
private boolean isMissing(String value) {
return (value == null) || value.trim().isEmpty() ;
}
}
import javax.faces.bean.ManagedBean; //记得不是import javax.annotation.ManagedBean;
@ManagedBean
public class LanguageForm {
private String language ;
public String getLanguage() {
return language;
}
public void setLanguage(String language) {
this.language = language.trim() ;
}
public String showChoice() {
if (isMissing(language)) {
return "missing-language" ;
}
else if (language.equalsIgnoreCase("Java")
|| language.equalsIgnoreCase("Groovy")) {
return "good-language" ;
}
else {
return "bad-language" ;
}
}
private boolean isMissing(String value) {
return (value == null) || value.trim().isEmpty() ;
}
}
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