Java - Unable to read image by url

0
votes

I have been looking for answer everywhere and nothing help.

Thats my code :

BufferedImage img1 = ImageIO.read(new File(dir1));
URL url = new URL(image_srcURL);
BufferedImage img2 = 
ImageIO.read(url.openStream());

Now I get the exception below when I'm trying to read the url.

javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target at java.base/sun.security.ssl.Alerts.getSSLException(Alerts.java:198) at java.base/sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1974) at java.base/sun.security.ssl.Handshaker.fatalSE(Handshaker.java:345) at java.base/sun.security.ssl.Handshaker.fatalSE(Handshaker.java:339) at java.base/sun.security.ssl.ClientHandshaker.checkServerCerts(ClientHandshaker.java:1968) at java.base/sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1777) at java.base/sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:264) at java.base/sun.security.ssl.Handshaker.processLoop(Handshaker.java:1098) at java.base/sun.security.ssl.Handshaker.processRecord(Handshaker.java:1026) at java.base/sun.security.ssl.SSLSocketImpl.processInputRecord(SSLSocketImpl.java:1137) at java.base/sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1074) at java.base/sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:973) at java.base/sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1402) at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1429) at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1413) at java.base/sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:567) at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185) at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1581) at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1509) at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:245) at com.folderName.Tools.DataForAutomationV1.compareImg(DFA.java:606) at com.folderName.VendorTests.SettingsPage.editCompDets(SettingsPage.java:562) at com.folderName.VendorTests.SettingsPage.runTest(SettingsPage.java:62) at com.folderName.Vendor.vendorTests(Vendor.java:36) at com.folderName.Main.main(Main.java:40) Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target at java.base/sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:385) at java.base/sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:290) at java.base/sun.security.validator.Validator.validate(Validator.java:264) at java.base/sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:343) at java.base/sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:226) at java.base/sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:133) at java.base/sun.security.ssl.ClientHandshaker.checkServerCerts(ClientHandshaker.java:1947) ... 20 more Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target at java.base/sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:141) at java.base/sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:126) at java.base/java.security.cert.CertPathBuilder.build(CertPathBuilder.java:297) at java.base/sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:380) ... 26 more

Any help would be great. I'm trying to read an image inside the url and compare it to an existing file. There wasn't any questions here that gave the answer.

Edit:

I've try to enter in my command line " keytool -list -keystore keystore ", but it showed me only trustedCertEntries. No solution worked yet.

3
javasecurityssljava-io
Possible duplicate of Resolving javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed Error? – Matteo Baldi
Looks like you'll need a cert to view the URL. – achAmháin
Is the url HTTPS? – nabster
@nabster yes it is – yakir saadia
@MatteoBaldi that questions is about the servers and data he entered inside the server.xml file, I'm looking for a solution used by my java code if there is or better explanation of how to do it in the command line – yakir saadia

3 Answers

0
votes

Below is an example of how I implemented it. The code reads the the response body into an awt BufferedImage, then writes to a .jpg file, then reads the file back into a byte array and then deletes the file. I'm sure I found help with this on SO but I don't have the answer handy. I will try to find that so I can cite. Hope it helps you!

**Edit as @Srikanthkumar mentions in his answer, you will also need to get the cert and add it to your truststore of your JVM. You can get that through a browser via whatever browser you have cert exploring tools.

import java.awt.image.BufferedImage;
import java.io.File;
import java.net.URL;
import java.nio.file.Files;
import java.util.Base64;
import java.util.UUID;
import javax.imageio.ImageIO;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Override
public String getImage(String productNumber) throws EcomWebException {

try {
    BufferedImage image = ImageIO.read(url);
    File file = new File(guid.toString() + ".jpg");
    ImageIO.write(image, "jpg", file);
    String base64ImageString = Base64.getEncoder().encodeToString(Files.readAllBytes(file.toPath()));
    file.delete();
    return base64ImageString;
} catch (Exception e) {
    throw new EcomWebException(IMAGE_NOT_FOUND_MESSAGE + productNumber, e);
}
}
0
votes

First you need to obtain the certificate of the server, add it to a keystone file, either to the java truststore in jre or a separate file. If you are creating a new truststore then make sure that you supply truststore to your program

0
votes

The following snippet from this post may help you:

TrustManager[] trustAllCerts = new TrustManager[]{
    new X509TrustManager() {
        @Override
        public java.security.cert.X509Certificate[] getAcceptedIssuers()
        {
            return new X509Certificate[0];
        }

        @Override
        public void checkClientTrusted(
            java.security.cert.X509Certificate[] certs, String authType
        ) {}

        @Override
        public void checkServerTrusted(
            java.security.cert.X509Certificate[] certs, String authType
        ) {}
    }
};

try {
    SSLContext sc = SSLContext.getInstance("SSL");
    sc.init(null, trustAllCerts, new java.security.SecureRandom());

    HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
} catch (GeneralSecurityException e) {
}