Unable to connect to the local gae endpoint from the Genymotion emulator… here is a solution to the problem.
Unable to connect to the local gae endpoint from the Genymotion emulator
This is a simple helloworld project that uses endpoints generated from the MyBean and MyEndpoint classes, which come with Endpoints modules by default. The emulator I’m using is Genymotion, which I connect to via /10.0.2.2 ip. When I access the endpoint server locally in my web browser “localhost:8080″ it works just fine, but when I run/debug it with the emulator in AndroidStudio I get this timeout exception :
-3571/com.serjsmor.anotherbackend W/System.err﹕ java.net.SocketTimeoutException: failed to connect to /10.0.2.2 (port 8080) after 20000ms
03-03 11:44:30.310 3548-3571/com.serjsmor.anotherbackend W/System.err﹕ at libcore.io.IoBridge.connectErrno(IoBridge.java:169)
03-03 11:44:30.310 3548-3571/com.serjsmor.anotherbackend W/System.err﹕ at libcore.io.IoBridge.connect(IoBridge.java:122)
03-03 11:44:30.310 3548-3571/com.serjsmor.anotherbackend W/System.err﹕ at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
03-03 11:44:30.310 3548-3571/com.serjsmor.anotherbackend W/System.err﹕ at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:456)
03-03 11:44:30.310 3548-3571/com.serjsmor.anotherbackend W/System.err﹕ at java.net.Socket.connect(Socket.java:882)
03-03 11:44:30.310 3548-3571/com.serjsmor.anotherbackend W/System.err﹕ at com.android.okhttp.internal.Platform.connectSocket(Platform.java:139)
03-03 11:44:30.310 3548-3571/com.serjsmor.anotherbackend W/System.err﹕ at com.android.okhttp.Connection.connect(Connection.java:148)
03-03 11:44:30.310 3548-3571/com.serjsmor.anotherbackend W/System.err﹕ at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:276)
03-03 11:44:30.310 3548-3571/com.serjsmor.anotherbackend W/System.err﹕ at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:211)
03-03 11:44:30.310 3548-3571/com.serjsmor.anotherbackend W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:373)
03-03 11:44:30.310 3548-3571/com.serjsmor.anotherbackend W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:106)
03-03 11:44:30.310 3548-3571/com.serjsmor.anotherbackend W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java :208)
03-03 11:44:30.310 3548-3571/com.serjsmor.anotherbackend W/System.err﹕ at com.android.okhttp.internal.http.DelegatingHttpsURLConnection.getOutputStream( DelegatingHttpsURLConnection.java:218)
03-03 11:44:30.310 3548-3571/com.serjsmor.anotherbackend W/System.err﹕ at com.android.okhttp.internal.http.HttpsURLConnectionImpl.getOutputStream( HttpsURLConnectionImpl.java:25)
03-03 11:44:30.310 3548-3571/com.serjsmor.anotherbackend W/System.err﹕ at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:77)
03-03 11:44:30.310 3548-3571/com.serjsmor.anotherbackend W/System.err﹕ at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:965)
03-03 11:44:30.310 3548-3571/com.serjsmor.anotherbackend W/System.err﹕ at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed( AbstractGoogleClientRequest.java:410)
03-03 11:44:30.310 3548-3571/com.serjsmor.anotherbackend W/System.err﹕ at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed( AbstractGoogleClientRequest.java:343)
03-03 11:44:30.310 3548-3571/com.serjsmor.anotherbackend W/System.err﹕ at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute( AbstractGoogleClientRequest.java:460)
03-03 11:44:30.310 3548-3571/com.serjsmor.anotherbackend W/System.err﹕ at com.serjsmor.anotherbackend.MainActivity$1.run(MainActivity.java:25)
03-03 11:44:30.310 3548-3571/com.serjsmor.anotherbackend W/System.err﹕ at java.lang.Thread.run(Thread.java:818)
Client module:
Test the endpoint .java
public class TestEndpoint {
final MyApi taskApiService;
Constructor
public TestEndpoint () {
MyApi.Builder builder = new MyApi.Builder(AndroidHttp.newCompatibleTransport(),
new AndroidJsonFactory(), null)
.setRootUrl("https://10.0.2.2:8080/_ah/api/")
.setGoogleClientRequestInitializer( new GoogleClientRequestInitializer() {
@Override
public void initialize(AbstractGoogleClientRequest<?> abstractGoogleClientRequest)
throws IOException {
abstractGoogleClientRequest.setDisableGZipContent(true);
}
}
);
taskApiService = builder.build();
} // end of constructor, other methods to follow in this class...
}
The actual code to run it:
The main activity .java
new Thread( new Runnable() {
@Override
public void run() {
TestEndpoint test = new TestEndpoint();
try {
test.taskApiService.sayHi("sdad").execute();
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();
Backend module:
MyBean.java
public class MyBean {
private String myData;
public String getData() {
return myData;
}
public void setData(String data) {
myData = data;
}
}
My endpoint .java
@Api(name = "myApi", version = "v1", namespace = @ApiNamespace(ownerDomain = "backend.anotherbackend.serjsmor.com", ownerName = "backend.anotherbackend.serjsmor.com", packagePath = ""))
public class MyEndpoint {
/**
* A simple endpoint method that takes a name and says Hi back
*/
@ApiMethod(name = "sayHi")
public MyBean sayHi(@Named("name") String name) {
MyBean response = new MyBean();
response.setData("Hi, " + name);
return response;
}
Module: app build.gradle
apply plugin: 'com.android.application'
android {
compileSdkVersion 21
buildToolsVersion "21.1.2"
defaultConfig {
applicationId "com.serjsmor.anotherbackend"
minSdkVersion 15
targetSdkVersion 21
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:21.0.3'
compile project(path: ':backend', configuration: 'android-endpoints')
}
Module: Backend build.gradle
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.google.appengine:gradle-appengine-plugin:1.9.14'
}
}
repositories {
jcenter();
}
apply plugin: 'java'
apply plugin: 'war'
apply plugin: 'appengine'
sourceCompatibility = JavaVersion.VERSION_1_7
targetCompatibility = JavaVersion.VERSION_1_7
dependencies {
appengineSdk 'com.google.appengine:appengine-java-sdk:1.9.14'
compile 'com.google.appengine:appengine-endpoints:1.9.14'
compile 'com.google.appengine:appengine-endpoints-deps:1.9.14'
compile 'javax.servlet:servlet-api:2.5'
}
appengine {
downloadSdk = true
appcfg {
oauth2 = true
}
endpoints {
getClientLibsOnBuild = true
getDiscoveryDocsOnBuild = true
}
}
Solution
10.0.2.2 refers to your Genymotion emulator device, which is not where your development application engine server runs.
Your development application engine server should be running on your local desktop computer with a typical IP address, such as 192.168.1.100. So do it instead:
.setRootUrl(“http://192.168.1.100:8080/_ah/api/ “)
In the cmd.exe window, use the ipconfig command to find your IP address from Windows. I don’t know about other operating systems. Note that you will be using “http” locally instead of “https” (for accessing the application engine on appspot.com).
All your other code seems to be correct!