我想標註一個Java類創建JAXB模式與具有價值屬性的元素。代碼如下:帶有Object類型的JAXB屬性拋出空指針異常?
@XmlAttribute(name="value")
public Object getSettingValue() {
return this.settingValue;
}
public void setSettingValue(final Object settingValue) {
this.settingValue = settingValue;
}
當我嘗試生成模式(使用Eclipse的非莫西實現),我得到這個空指針異常:
Exception in thread "main" java.lang.NullPointerException
at com.sun.xml.internal.bind.v2.runtime.reflect.TransducedAccessor.get(TransducedAccessor.java:154)
at com.sun.xml.internal.bind.v2.runtime.property.AttributeProperty.<init>(AttributeProperty.java:56)
at com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create(PropertyFactory.java:93)
at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(ClassBeanInfoImpl.java:145)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:479)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:305)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1100)
at com.sun.xml.internal.bind.v2.ContextFactory.createContext(ContextFactory.java:143)
at com.sun.xml.internal.bind.v2.ContextFactory.createContext(ContextFactory.java:110)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:202)
at javax.xml.bind.ContextFinder.find(ContextFinder.java:376)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:574)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:522)
at org.eclipse.jpt.jaxb.core.schemagen.Main.buildJaxbContext(Main.java:95)
at org.eclipse.jpt.jaxb.core.schemagen.Main.generate(Main.java:76)
at org.eclipse.jpt.jaxb.core.schemagen.Main.execute(Main.java:62)
at org.eclipse.jpt.jaxb.core.schemagen.Main.main(Main.java:47)
當我做了這個一個@XmlElement代替一個屬性,模式生成沒有問題,所以它必須與此相關。有任何想法嗎?
您的屬性必須是「對象」類型還是可以將其更改爲「字符串」? – 2013-02-15 17:14:07
@BlaiseDoughan我們將傳入各種類型的對象 - 整型,布爾或字符串(也可能是其他類型,因爲我們擴展了我們的應用程序)。我不知道我們是否可以將其更改爲字符串。我們可以創建一個獨立的setter,它將採用String。 – chama 2013-02-15 17:24:29
@BlaiseDoughan我可以改變它的字符串,然後通過我的真實方法。謝謝! – chama 2013-02-15 17:42:09