0

下面的代码会生成此异常：

java.sql.SQLException: Invalid state, the CallableStatement object is closed.
    at net.sourceforge.jtds.jdbc.JtdsCallableStatement.checkOpen(JtdsCallableStatement.java:120)
    at net.sourceforge.jtds.jdbc.JtdsStatement.getConnection(JtdsStatement.java:1207)
    at net.sourceforge.jtds.jdbc.JtdsResultSet.getConnection(JtdsResultSet.java:409)
    at net.sourceforge.jtds.jdbc.JtdsResultSet.close(JtdsResultSet.java:470)
    at org.apache.tomcat.dbcp.dbcp.DelegatingResultSet.close(DelegatingResultSet.java:152)
    at

下面的这段代码有时会产生上面的错误，但有时不会：

   private void doRequest(HttpServletRequest request) throws IOException, ServletException {
        CallableStatement stmt = null;
        ResultSet rs = null;
        String someString;
        try {
            this.connectDB();
            stmt = this.conn.prepareCall("{call sp_SomeSP1(?)}");
            stmt.setLong(1, someFunc());

            rs = stmt.executeQuery();

            while (rs.next()) {
                if (rs.getInt(1)==someOtherFunc()) {
                    someString = rs.getString(2);
                    break;
                }
            }

            stmt = conn.prepareCall("{call sp_someSP(?, ?)}");
            stmt.setLong(1, someFunc());
            stmt.setTimestamp(2, new Timestamp(getFrom().getTime()));

            rs = stmt.executeQuery();
            if (rs.next()) {
                lastUpdated = rs.getTimestamp("LastUpdated");
            }

            request.setAttribute("lastUpdated", lastUpdated);

            LOGGER.debug("Forwarding to view...");
            getServletContext().getRequestDispatcher("/SomeJSP.jsp").forward(this.request, this.response);

        } catch (NamingException e) {
            LOGGER.error("Database connection lookup failed", e);
            sendError("Server Error");
        } catch (SQLException e) {
            LOGGER.error("Query failed", e);
            sendError("Server Error");
        } catch (IllegalStateException e) {
            LOGGER.error("View failed", e);
        } finally {
            try {
                if (rs!=null) rs.close(); 
            } catch (NullPointerException e) {
                LOGGER.error("Result set closing failed", e);
            } catch (SQLException e) {
                LOGGER.error("Result set closing failed", e);
            }
            try {
                if (stmt!=null) stmt.close();
            } catch (NullPointerException e) {
                LOGGER.error("Statement closing failed", e);
            } catch (SQLException e) {
                LOGGER.error("Statement closing failed", e);
            }
            try {
                this.closeDB();
            } catch (NullPointerException e) {
                LOGGER.error("Database connection closing failed", e);
            } catch (SQLException e) {
                LOGGER.error("Database connection closing failed", e);
            }
        }

这意味着doRequest()大部分时间都可以正常工作，但有时我们会收到HTTP 错误 500，如果我们检查 tomcat 日志，我们会看到：

java.sql.SQLException: Invalid state, the CallableStatement object is closed.
4

3 回答 3

4

您似乎正在使用带有 Servlet（conn变量）的成员变量。但是，Servlet 通常可以由多个线程同时调用。你如何确保多个线程不会意外使用/关闭同一个连接？

于 2012-12-19T03:23:43.047 回答
1 
stmt.setLong(1, someFunc());
stmt.setTimestamp(3, new Timestamp(getFrom().getTime()));

这将是

stmt.setLong(1, someFunc());
stmt.setTimestamp(2, new Timestamp(getFrom().getTime()));
于 2012-12-19T03:17:15.733 回答
0

在堆栈跟踪中看到此错误消息org.apache.tomcat.dbcp.dbcp.DelegatingResultSet.close，看起来您在关闭 resultset 时遇到了错误。

我建议您更改结果集检查条件以在关闭结果集之前检查结果集是否仍然打开：

    if (rs!=null && ! rs.isClosed()){
        //resultset is there and not in closed state
        rs.close(); 
    }
于 2012-12-19T03:24:06.150 回答