线程“main”中的异常 java.lang.NullPointerException (eclipse)
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Exception in thread "main" java.lang.NullPointerException (eclipse)
提问by motahareh ar
my code is :
我的代码是：
import ir.sbu.nlp.wordnet.data.model.FNSense;
import ir.sbu.nlp.wordnet.data.model.FNSynset;
import ir.sbu.nlp.wordnet.data.model.FNSynsetsRelation;
import ir.sbu.nlp.wordnet.service.FNSynsetService;
import java.util.Vector;
public class sample2 {
public static void main(String[] args) {
FNSynsetService service=new FNSynsetService();
service.findAll();
}
}
and when I run it display this error
当我运行它时显示此错误
Data Load Started... Exception in thread "main" java.lang.NullPointerException at ir.sbu.nlp.wordnet.data.dao.FNWordDao.getTextNode(FNWordDao.java:513) at ir.sbu.nlp.wordnet.data.dao.FNWordDao.loadWords(FNWordDao.java:438) at ir.sbu.nlp.wordnet.data.dao.FNWordDao.<init>(FNWordDao.java:76) at ir.sbu.nlp.wordnet.data.dao.FNDaoManager.<init>(FNDaoManager.java:25) at ir.sbu.nlp.wordnet.data.dao.FNDaoManager.getInstance(FNDaoManager.java:40) at ir.sbu.nlp.wordnet.service.FNSynsetService.<init>(FNSynsetService.java:51) at sample2.main(sample2.java:12)
Data Load Started... Exception in thread "main" java.lang.NullPointerException at ir.sbu.nlp.wordnet.data.dao.FNWordDao.getTextNode(FNWordDao.java:513) at ir.sbu.nlp.wordnet.data.dao.FNWordDao.loadWords(FNWordDao.java:438) at ir.sbu.nlp.wordnet.data.dao.FNWordDao.<init>(FNWordDao.java:76) at ir.sbu.nlp.wordnet.data.dao.FNDaoManager.<init>(FNDaoManager.java:25) at ir.sbu.nlp.wordnet.data.dao.FNDaoManager.getInstance(FNDaoManager.java:40) at ir.sbu.nlp.wordnet.service.FNSynsetService.<init>(FNSynsetService.java:51) at sample2.main(sample2.java:12)
Can every one help me? I copy every file needed for installation
每个人都可以帮助我吗？我复制安装所需的每个文件
采纳答案by Vivek Vermani
Seems like you need to set some object before calling service.findAll();
似乎您需要在调用 service.findAll(); 之前设置一些对象；
While this method is executing it might be trying to access some object which is turning out to be null. Debug and find out the exact line which is throwing NPE.
在执行此方法时，它可能试图访问某个结果为 null 的对象。调试并找出抛出 NPE 的确切线路。
