![]() The main purpose of using it here is to manually trigger the GC and verify whether the GC is performed. JProfiler, a java performance analysis tool, I integrated with IDEA when I used it.wireshark, capture packets to view the data packets transmitted in tcp in detail.Windows cmd command line, "netstat -ano|findstr 9911" command (9911 is the other server port I connected to when I tested) to check the tcp connection, including whether tcp exists, and it is in TIME_WAIT, ESTABLISHED or other states.Consider abiding by this rule when taking into account teamwork and conformity to habits.ġ /** 2 * Creates a stream socket and connects it to the specified portĥ * If the specified host is method doesn't allow the operation.Ģ9 * IllegalArgumentException if the port parameter is outsideģ0 * the specified range of valid port values, which is betweenģ2 * #setSocketImplFactory()ģ4 * #createSocketImpl()ģ6 */ 37 public Socket(String host, int port)ģ8 throws UnknownHostException, IOExceptionĤ0 this (host != null ? new InetSocketAddress(host, port) :Ĥ1 new InetSocketAddress(InetAddress.getByName( null ), port), It can be seen that this rule is not applicable everywhere (at least the Socket construction method in jdk here is contrary to this rule). If there is initialization logic, please put it in the init method. It is forbidden to add any business logic in the construction method. You could always do an strace on syslog-ng starting up, and check all the bind calls to see if it calls bind multiple times for the same port number. ![]() Reminiscent of the "Alibaba JAVA Development Manual.pdf" document that was widely disseminated some time ago, there is one such article:ġ1. Maybe you are opening that socket twice somehow You should define a source once and then reference it from other parts of the config. ![]() Combined with the third conclusion of the above conclusion, it can be seen that some business logic is carried out in the 40th line of the construction method. It provides many features such as Memory Profiling, Heap Walker, CPU profiling, Thread. PS: Below is the code of the new Socket (host, port) construction method. The JProfiler can be downloaded using this link. The above conclusions are obtained from personal tests, please correct me if there is any discrepancy. After the socket object is created using new Socket (host, port), a tcp connection will be established.Release Note: invokedynamic implementation should not wrap Errors. Actively calling the socket's close() method has the same effect. JDK-8044858 - Fix raw and unchecked lint warnings in socket direct protocol. At this time, the active tcp connection will be closed with four waves of hands, and then enter the TIME_WAIT state for a period of time. When the socket object is recycled by the GC, the socket's close() method will be called.(Generally, when the abnormal connection is closed, the RST reset flag is used) It gives an error that the driver fails to bind to socket. But there are only 125 lines in chrome.js. As per '1731', it should get fixed, if you add code to line 126. And it is to close tcp by sending RST instead of four waves to close tcp, it will not enter the TIME_WAIT state. It gives an error that the driver fails to bind to socket. The socket tcp connection will be closed when the java program exits and the process is killed. ![]() Draw some conclusions and share them with you at the same time. So I did some experiments to verify that the socket tcp connection is calling close, was recovered GC, quit the program finished running, the program process is killed, tcp will produce what kind of behavior. In my thinking, I found that I need to sort out what happens when the socket is closed actively and passively. ![]() Today, I need to use socket tcp connection (as a tcp client) in the project development. Import explore the behavior of socket tcp connection when the program exits and GC garbage collection in java How is this program using memory inefficiently? I should run the program for more that 2-3 days non-stop to get the results I need. Through the thread dump, you can confirm that the thread status stays BLOCKED because <0xe0375410> lock could not be obtained.When I run the program for more than 3 hours, the program runs out of memory. The same value must then also be set in the browser add-on (within the browser itself). You can check whether monerod is running by looking at the process list (ps, top, or other tool), or whether monerod or another program is already bound on that socket using netstat -ntpa (flags may vary based on netstat variant used). I am developing a web crawler application. To do so, open the program options by going to Edit -> Options -> Browsers and change the value of the WebSockets port. There are two main reasons a program can not bind to a socket: the port is already used: typically, for the Monero daemon, this means another monerod is already running. ![]()
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