使用Rserve重置Java.net连接

Question

我在尝试通过Java运行R程序时遇到异常。正在建立连接，但随后在R代码评估开始时抛出错误。

Rconnection connection = new RConnection();

System.out.println(String.valueOf(connection.isConnected())); //Output: True
connection.eval("source('C:\\Users\\Vini\\Documents\\test.R')"); //Exception in this line

我已经在R中启动了Rserve。

java.net.SocketException: Connection reset
  at java.net.SocketInputStream.read(SocketInputStream.java:209)
  at java.net.SocketInputStream.read(SocketInputStream.java:141)
  at java.net.SocketInputStream.read(SocketInputStream.java:127)
  at org.rosuda.REngine.Rserve.protocol.RTalk.request(RTalk.java:213)
  at org.rosuda.REngine.Rserve.protocol.RTalk.request(RTalk.java:180)
  at org.rosuda.REngine.Rserve.protocol.RTalk.request(RTalk.java:250)
  at org.rosuda.REngine.Rserve.RConnection.eval(RConnection.java:231)
  at integration.Integration.main(Integration.java:36)
org.rosuda.REngine.Rserve.RserveException: eval failed
  at org.rosuda.REngine.Rserve.RConnection.eval(RConnection.java:234)
  at integration.Integration.main(Integration.java:36)

Answer 1

问题是isConnected不能保证在建立连接后它会报告正确的状态：

请注意，当前不会对此状态进行现场检查，即如果连接因外部事件而中断，则标志不会反映这一点

您需要检查Rserve日志以检查请求是否已成功处理