Android.system.ErrnoException: isConnected failed: ECONNREFUSED (Connection refused)

Question

Im using Java connect with MySQL and Json will send data to android, When I send data from Java to json by URL address:

http://192.168.1.221:9999/rentalcar_service/category/getAllManufacturer

everything's fine, but when I parse data in Android I received an error result following as:

private static final String URL_MANUFACTURERS = "http://192.168.1.221:9999/rentalcar_service/category/getAllManufacturer";

Logcat:

W/System.err: Caused by: android.system.ErrnoException: isConnected failed:    ECONNREFUSED (Connection refused)
W/System.err:     at libcore.io.IoBridge.isConnected(IoBridge.java:223)
W/System.err:   ... 25 more
I/MemoryCache: cache size=0 length=4
W/System.err: java.net.ConnectException: failed to connect to localhost/127.0.0.1 (port 9999) after 30000ms: isConnected failed: ECONNREFUSED (Connection refused)
W/System.err:     at libcore.io.IoBridge.isConnected(IoBridge.java:234)
W/System.err:     at libcore.io.IoBridge.connectErrno(IoBridge.java:171)
W/System.err:     at libcore.io.IoBridge.connect(IoBridge.java:122)

(192.168.1.221) IP address is my PC, if I change from 192.168.1.221 to localhost, I still receive same error.

How to fix this problem? Thank so much !

Answer 1

If you are trying to access a mock local server (i.e. localhost) it won't work, because android runs on a separate environment (a device, or emulator), i.e. it has a different localhost than your development machine... you have to publish your server somewhere online.

If you just want a JSON in a REST api, you can use My-Json-Server.

Answer 2

ECONNREFUSED means that the connection was attempted and the remote host port is not listening. Hence this can be caused because of:

Is it a valid IP? check using ifconfig or ipconfig. You can try pinging the server.

Details regarding the error can be understood from here: https://android.googlesource.com/platform/libcore/+/jb-mr2-release/luni/src/main/java/libcore/io/ErrnoException.java https://developer.android.com/reference/android/system/ErrnoException.html