Behzod Muslimov Behzod Muslimov - 12 days ago 7
Java Question

how to resolve jsoup error: unable to find valid certification path to requested target

I am trying to parse the html of the following URL:

https://www.smuc.ac.kr/mbs/smuc/jsp/board/list.jsp?boardId=6993&id=smuc_040100000000

I'm getting the following error:

sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:387)
at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:292)
at sun.security.validator.Validator.validate(Validator.java:260)
at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:324)
at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:229)
at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:124)
at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1491)
... 15 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:141)
at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:126)
at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:280)
at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:382)
... 21 more



This is my code:

public class MainActivity extends AppCompatActivity {
private ListView listView;
private TextView textView;
public ArrayList<String> arrayList = new ArrayList<String>();
private ArrayAdapter<String> arrayAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listView);
new Insert().execute();
arrayAdapter = new ArrayAdapter<String>(MainActivity.this, R.layout.list_ok, R.id.text, arrayList );
}

class Insert extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
try {
// Connection.Response res = Jsoup.connect("https://www.smuc.ac.kr/mbs/smuc/index.jsp")
// .method(Connection.Method.POST)
// .execute();
Document document = Jsoup.connect("https://www.smuc.ac.kr/mbs/smuc/jsp/board/list.jsp?boardId=6993&id=smuc_040100000000").get();
Elements elements = document.select(".tit");
arrayList.clear();
for (Element element : elements) {
arrayList.add(element.text());
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result){
listView.setAdapter(arrayAdapter);
}

}

}

Answer

You can ignore TSL validation, set validateTLSCertificates(false):

Document document = Jsoup.connect("https://www.smuc.ac.kr/mbs/smuc/jsp/board/list.jsp?boardId=6993&id=smuc_040100000000")
                .timeout(10000).validateTLSCertificates(false).get();

Since the reading the page also takes a while, increase the timeout timeout(10000).

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