java - PMD 消息 "Avoid using java.lang.ThreadGroup; it is not thread safe"

Question

问题:

为什么 maven PMD 插件对下面的代码行发出以下警告:警告:

Avoid using java.lang.ThreadGroup; it is not thread safe

代码(第二行):

Calendar cal = Calendar.getInstance();
java.sql.Date endDate = new java.sql.Date(cal.getTime().getTime());

上下文:

我有一个 java.sql.Date 实例:

public class XYZServlet extends HttpServlet {

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
        throws ServletException, IOException {
    this.doPost(req, resp);
}

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse resp)
        throws ServletException, IOException {


    Connection conn = null;
    CallableStatement stmt = null;
    try {
        conn = ...
        ...

        Calendar cal = Calendar.getInstance();
        java.sql.Date endDate = new java.sql.Date(cal.getTime().getTime());

        ...
    } catch ...
    }finally {
        try {
            stmt.close();
            conn.close();
        } catch(Exception e) {}
    }
}

PMD报告的行是

java.sql.Date endDate = new java.sql.Date(cal.getTime().getTime());

消息是:

Avoid using java.lang.ThreadGroup; it is not thread safe

Answer 1

这似乎是 PMD 4.2.6 中的错误。

SourceForge-链接:
http://sourceforge.net/projects/pmd/forums/forum/188192/topic/4781145