Exception occurred during event dispatching 数据库操作异常 不知怎么解决
当我点击一个按钮事件是
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
String sql="select xh,xm from baomingbiao where";
sql+="zkh='"+j2.getText().trim()+"'";
showTable(sql);
}
调用方法 showTable(sql);
void showTable(String sql){
tmt.initTool(tmt.data,tmt.titles);
dtm=new DefaultTableModel();
String s[]={"学号","姓名"};
tmt.showResultSet(sql,tmt.data,tmt.titles);
boolean b=tmt.dengluYanzheng(sql);
if(!b)
JOptionPane.showMessageDialog(null,"没有找到您查询的学生!");
t.setModel(dtm);
for(int i=0;i<s.length;i++)
dtm.addColumn(s[i]);
for(int i=0;i<tmt.data.size();i++){
dtm.addRow((Vector)tmt.data.get(i));
}
}
总是提示错误,可就是不知道那里出错了
提示错误一:Exception occurred during event dispatching:
java.lang.NullPointerException
提示错误二: at java.security.AccessController.doPrivileged(Native Method)
有那个高人告诉下怎么解决