How to resolve "java.net.SocketException: Unexpected end of file from server" when making a GET REST API call [closed]

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I have a web server running on different machine. I am able to use postman client and load cert.pem and key.pem files and successfully do a get request.

Now I want to do this programmatically in Java. To do that I added the PKCS12 to the keystore as below:

keytool -importkeystore -destkeystore keystore.jks -srcstoretype PKCS12 -srckeystore keystore.p12

keytool -list -keystore keystore.jks

Now in the code I did this:

String url = "http://localhost:9443/server/api/v1/"+id+"/_history/"+history;
URL obj = new URL(url);
HttpURLConnection con = (HttpURLConnection) obj.openConnection();

System.setProperty("javax.net.ssl.keyStore", "/Users/rc/Downloads/test101/jks/keystore.jks");

System.setProperty("javax.net.ssl.keyStorePassword", "asdfgh");
System.setProperty("javax.net.ssl.keyStoreType", "JKS");            

con.setRequestMethod("GET");

        //add request header
con.setRequestProperty("Content-Type", "application/json");
con.setRequestProperty("Accept", "application/json");

int responseCode = con.getResponseCode();       
System.out.println("\nSending 'GET' request to URL : " + url);      
System.out.println("Response Code : " + responseCode);

I am getting this error:

java.net.SocketException: Unexpected end of file from server at this line :
int responseCode = con.getResponseCode();

I moved the system properties to line before connection. I still see same error — javaMan
– javaMan, Commented Apr 10, 2018 at 22:41
This was so helpful to me. But why did it work with JDK 18 without installing the cert but it throws this error with JDK 8? — tarekahf
– tarekahf, Commented Jan 12, 2023 at 19:20
@tarekahf JDK 8, you mean the version from 2014, nearly a decade ago? Most likely this technology/process was just not supported by Java way back then. — TylerH
– TylerH, Commented Sep 5 at 15:18

Yuriy Alevohin · Accepted Answer · 2018-04-11 04:07:17Z

5

You are trying to connect via http://, but should use https://. Look at your URL:

String url = "http://localhost:9443/server/api/v1/"+id+"/_history/"+history;

"java.net.SocketException: Unexpected end of file" means that the server accepted and then closed the connection without sending a response. I believe port 9443 for HTTPS connection is not ready to accept HTTP connection.

answered Apr 11, 2018 at 4:07

Yuriy Alevohin

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2 Comments

javaMan Over a year ago

Thanks for pointing it out. I fixed it and see the below error: Exception in thread "main" javax.net.ssl.SSLHandshakeException: java.security.cert.CertificateException: No subject alternative DNS name matching localhost found.

TylerH Sep 5 at 15:39

@javaMan When you resolve an error you've asked about thanks to an answer you've received, and you have a new error, please ask a new question (via clicking the "Ask question" button at the top of the site); don't edit your existing question to ask continuously more things.

Deepak gupta · Accepted Answer · 2023-10-23 16:20:58Z

Follow the below step to add SSL Certificate in you application API Call.

Step : 1 Download SSL Certificate from web by following below steps

Go to your website
Click on lock button in URL bar
A Popup will appear -> Click on -> Connection is secure
Click on certificate button
Click on Details Tab -> Export it save it.
e.g certificate.crt

Step : 2

Go to android studio project
Add the certificate file in res/raw
Create xml resource directory within res/xml
Create network_security_config.xml file inside res/xml dir.

<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
    <domain-config>
        <domain includeSubdomains="true">yourdomain.com</domain>
        <trust-anchors>
            <certificates src="@raw/certificate"/>
        </trust-anchors>
    </domain-config>
</network-security-config>

Step : 3

Go to AndroidManifest.xml
Inside application tag add the below line

android:networkSecurityConfig="@xml/network_security_config"

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