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[英]OpenCSV java.lang.NoSuchMethodException: Unknown property 'X' on class Y
[英]java.lang.NoSuchMethodException: Unknown property 'language' on class 'class java.lang.Class'
我收到以下错误:
java.lang.NoSuchMethodException: Unknown property 'language' on class 'class java.lang.Class'
使用过的休息电话:/ Test / rest / Languages / insertobj / Japanese / Swedish%206
我正在使用:org.apache.commons.beanutils.PropertyUtils;
我确实在我的Languages类中具有指定的属性'language',所以我不确定为什么会引发错误。 当我这样声明时,它可以工作:
语言lanobj = new Lanaguages();
//语言类
public class Languages implements java.io.Serializable {
private String language;
private String displayName;
public Languages() {
this.language = null;
this.displayName = null;
}
public Languages(String language, String displayName) {
this.language = language;
this.displayName = displayName;
}
public void setLanguageId(Long languageId) {
this.languageId = languageId;
}
@Column(name = "language", nullable = false, length = 50)
public String getLanguage() {
return this.language;
}
public void setLanguage(String language) {
this.language = language;
}
@Column(name = "displayName", nullable = false, length = 50)
public String getDisplayName() {
return this.displayName;
}
public void setDisplayName(String displayName) {
this.displayName = displayName;
}
}
///资源管理器代码
@Path("{subResources}/insertobj/{language-id}/{displayname-id}")
//@POST
@GET // Using get for the sake of making rest call with browser
@Produces(MediaType.TEXT_HTML)
public String getLanguageById(@PathParam("subResources") String id,
@PathParam("language-id") String language_id,
@PathParam("displayname-id") String displayname_id)
{
try{
Class<?> c = Class.forName("com.test."+id);
PropertyUtils.setProperty(c, "language",language_id);
PropertyUtils.setProperty(c, "displayName",displayname_id);
TransactionManager.createObject(c);
}catch (Exception exc){
exc.printStackTrace();
}
}
// TransactionManager片段:
public static void createObject(Object entityObject) {
Transaction tx = null;
//SessionFactoryUtil.getInstance().openSession();
Session session = SessionFactoryUtil.openSession();
try {
tx = session.beginTransaction();
session.save(entityObject);
tx.commit();
}
catch (RuntimeException e)
{
if (tx != null && tx.isActive())
{
try
{
// Second try catch as the rollback could fail as well
tx.rollback();
}
catch (HibernateException e1) {
//logger.debug(“Error rolling back transaction”);
}
// throw again the first exception
throw e;
}
}
finally
{
session.close();
}
}
您正在尝试在Class对象上为"com.test."+id
设置属性language
。 您需要创建此类的实例来设置值。 就像是:
try{
Class<?> c = Class.forName("com.test."+id);
Object o = c.newInstance();
PropertyUtils.setProperty(o, "language",language_id);
PropertyUtils.setProperty(o, "displayName",displayname_id);
TransactionManager.createObject(o);
}catch (Exception exc){
exc.printStackTrace();
}
c
引用的类必须具有零参数构造函数,此代码才能起作用。
setProperty
需要一个实例,而您正在传递类,请参见文档
Class<?> c = Class.forName("com.test."+id);
Language language = (Language)c.newInstance();
PropertyUtils.setProperty(language , "language",language_id);
您可以专门转换为Language
,也可以将其保留为Object
Object object = Class.forName("com.test."+id).newInstance();
PropertyUtils.setProperty(object, "language",language_id);
由于您的类Languages
没有定义默认的构造函数,因此beanutils无法进行反射。确保您在类中定义了默认的构造函数。
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