怎么根据异常堆栈信息找出错误源

Question

java.lang.NullPointerException
com.wy.tool.JDBConnection.executeQuery(JDBConnection.java:52)
com.wy.dao.ConsumerDao.getConsumerForm(ConsumerDao.java:98)
com.wy.webiter.ConsumerServlet.checkConsumer(ConsumerServlet.java:169)
com.wy.webiter.ConsumerServlet.doGet(ConsumerServlet.java:16)
com.wy.webiter.ConsumerServlet.doPost(ConsumerServlet.java:186)
javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

Answer 1

一般都是一层一层的，你找到最里层的信息就可以了，一般都是第一句
java.lang.NullPointerException
com.wy.tool.JDBConnection.executeQuery(JDBConnection.java:52)
表明JDBConnection的52行空指针了