Java

1. Choose the correct forum for your message. Posting a VB.NET question in the C++ forum will end in tears.
   
   
2. Be specific! Don't ask "can someone send me the code to create an application that does 'X'. Pinpoint exactly what it is you need help with.
   
   
3. Keep the subject line brief, but descriptive. eg "File Serialization problem"
   
   
4. Keep the question as brief as possible. If you have to include code, include the smallest snippet of code you can.
   
   
5. Be careful when including code that you haven't made a typo. Typing mistakes can become the focal point instead of the actual question you asked.
   
   
6. Do not remove or empty a message if others have replied. Keep the thread intact and available for others to search and read. If your problem was answered then edit your message and add "[Solved]" to the subject line of the original post, and cast an approval vote to the one or several answers that really helped you.
   
   
7. If you are posting source code with your question, place it inside <pre></pre> tags. We advise you also check the "Encode HTML tags when pasting" checkbox before pasting anything inside the PRE block, and make sure "Ignore HTML tags in this message" check box is unchecked.
   
   
8. Be courteous and DON'T SHOUT. Everyone here helps because they enjoy helping others, not because it's their job.
   
   
9. Please do not post links to your question in one forum from another, unrelated forum (such as the lounge). It will be deleted.
   
   
10. Do not be abusive, offensive, inappropriate or harass anyone on the boards. Doing so will get you kicked off and banned. Play nice.
    
    
11. If you have a school or university assignment, assume that your teacher or lecturer is also reading these forums.
    
    
12. No advertising or soliciting.
    
    
13. We reserve the right to move your posts to a more appropriate forum or to delete anything deemed inappropriate or illegal.

1. Read the question carefully
   
   
2. Understand that English isn't everyone's first language so be lenient of bad spelling and grammar
   
   
3. If a question is poorly phrased then either ask for clarification, ignore it, or mark it down. Insults are not welcome
   
   
4. If the question is inappropriate then click the 'vote to remove message' button
   

keycloak.security-constraints[0].authRoles[0]=user
keycloak.security-constraints[0].securityCollections[0].patterns[0]=/hello/*

http.authorizeRequests()
    .antMatchers("/user").hasAnyRole("ADMIN", "USER")
    .antMatchers("/admin").hasRole("ADMIN")
    .requestMatchers(PathRequest.toStaticResources().atCommonLocations()).permitAll()
    .antMatchers("/hello").permitAll().anyRequest().authenticated().and().formLogin()//permit all requests
    .loginPage("/login")
    .defaultSuccessUrl("/", true)
    .failureUrl("/login-error").permitAll().and()
    .logout()
    .invalidateHttpSession(true)
    .logoutSuccessUrl("/login")
    .logoutUrl("/logout");

When executing my application, the error that indicates the title of this post sends me some idea of ​​how I can solve it?

Buenas tardes a todos.
Antes que nada, gracias por su tiempo para leer mi consulta. Realmente no se si es aquí donde tengo que hacerla.
Tengo un inconveniente al querer guardar una imagen blob en la base de datos.
El tema es así:
Tengo un pequeño código el cual toma del portapapeles la imagen y la pega en una div y a la vez, genera la ruta del blob: blob:http://localhost:86/147377d3-7d99-4ca8-baec-913272f831f7 y lo pone en un textarea.
Ahora bien. Necesito guardar esa imagen en una base de datos: o bien guardarla como imagen dentro de un servidor y la ruta en una vchar o bien como base64 en un campo blob.
Cómo debo hacer?
Realmente he probado muchas cosas pero sin éxito.
Les dejo el pedazo de código que tengo.
Desde ya, muchísimas gracias!!



        window.addEventListener("paste", processEvent);
                 function processEvent(e) {
                    for (var i = 0; i 
      
        
        Aprieta las teclas Ctrl + V para pegar el portapapeles

private static final String ASYMMETRIC_KEY_ALG = "RSA";
    private static final String SYMMETRIC_KEY_ALG = "AES";
    private static final String SYMMETRIC_KEY_ALG_MODE_PAD = SYMMETRIC_KEY_ALG + "/ECB/PKCS7Padding";
    private static final String PROVIDER = "BC";
    private static final String HASH_DIGEST_ALG = "SHA3-512";
    private static final String CERT_FACTORY = "X.509";
    private static final String KEYSTORE_TYPE = "PKCS12";
    private static final String SIGNATURE_ALG = "SHA384with" + ASYMMETRIC_KEY_ALG;
    private static final String SECURE_RANDOM_ALG = "SHA1PRNG";
    private static final String AUTH_HASH_DIGEST_ALG = "PBKDF2WithHmacSHA512";
//    private static final File TRUSTSTORE_NAME = new File("/var/lib/secure-messenger-relay/truststore.p12");
    private static final File KEYSTORE_NAME = new File("/var/lib/secure-messenger-relay/keystore.p12");

    private static long serialNumberBase = System.currentTimeMillis();

    static{
        Security.addProvider(new BouncyCastleProvider());
        Security.addProvider(new BouncyCastleJsseProvider());
    }
    // APPARENTLY FUNCTIONALITY TO UPDATE KS PASSWORDS IS GOOD


    /**
     * Generate an RSA keypair
     * @return return the keypair
     * @throws GeneralSecurityException
     */
    public static KeyPair generateKeyPair()
            throws GeneralSecurityException
    {
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(ASYMMETRIC_KEY_ALG, PROVIDER);
        keyPairGenerator.initialize(new RSAKeyGenParameterSpec(3072, RSAKeyGenParameterSpec.F4));
        return keyPairGenerator.generateKeyPair();
    }



    /**
     * Generate a self signed V1 X509Certificate for use by the server to authenticate and sign new users into the network
     * it pertains to.
     * @param caPrivateKey The private key for use in signing
     * @param caPublicKey the public key of the certificate
     * @param name The name of the self signing party
     * @return The Certificate
     * @throws GeneralSecurityException
     * @throws OperatorCreationException
     */
    public static X509Certificate makeV1Certificate(PrivateKey caPrivateKey, PublicKey caPublicKey, String name)
            throws GeneralSecurityException, OperatorCreationException
    {

        X509v1CertificateBuilder v1CertBldr = new JcaX509v1CertificateBuilder(
                new X500Name("CN=" + name),
                calculateSerialNumber(),
                calculateDate(0),
                calculateDate(24 * 365 * 100),
                new X500Name("CN=" + name),
                caPublicKey);

        JcaContentSignerBuilder signerBuilder = new JcaContentSignerBuilder(SIGNATURE_ALG).setProvider(PROVIDER);
        return new JcaX509CertificateConverter().setProvider(PROVIDER).getCertificate(v1CertBldr.build(signerBuilder.build(caPrivateKey)));
    }


    /**
     * A date utilitiy for calculating how much time in the future a certificate will be valid for
     * @param hoursInFuture the number of hours you want the certificate to be valid for
     * @return the Date of that number of hours in the future from the current time
     */
    private static Date calculateDate(int hoursInFuture){

        long secs = System.currentTimeMillis() / 1000;

        return new Date((secs + (hoursInFuture * 60 * 60)) * 1000);
    }

    /**
     * A method for soliciting a distinct serial number for certificate generation for multiple threads
     * @return the SerialNumber
     */
    private static synchronized BigInteger calculateSerialNumber(){
        return BigInteger.valueOf(serialNumberBase++);
    }

    /**
     * produce a salt value for use in password hashing
     * @return salt
     * @throws NoSuchAlgorithmException missing boi
     */
    private static byte[] getSalt()
            throws NoSuchAlgorithmException
    {
        SecureRandom secureRandom = SecureRandom.getInstance(SECURE_RANDOM_ALG);
        byte[] salt = new byte[64];
        secureRandom.nextBytes(salt);
        return salt;
    }

}

public class ReceiverClientThreadTest {

    // ADD REG AND A SINGLE NETWORK
    // ESTABLISH A TLS CONNECTION BETWEEN TWO POINTS WITH
    private final static String KEY_MANAGER = "SunX509";
    private final static String TLS_VERSION = "TLSv1.2";
//    private final static String RNG_ALGORITHM = "DEFAULT";
//    private final static String RNG_PROVIDER = "BC";
    private static final String PROVIDER = "BC";
    private static final String KEYSTORE_TYPE = "PKCS12";
    private static KeyStore keyStore1, keyStore2, trustStore2;
    private SSLSocket serverSocket;
    private SSLSocket clientSocket;

    @BeforeClass
    public static void setUp() throws GeneralSecurityException, OperatorCreationException, IOException {

        // CODE HERE RESPONSIBLE FOR GENERATING V1 CERT AND PUTTING IT IN BOTH KEYSTORE FOR SERVER AND
        // TRUSTSTORE FOR CLIENT ( HAVE TRIED WITH AND WITHOUT A PASSWORD FOR setKeyEntry() WITHOUT EFFECT

        String name1 = "localhost", name2 = "client";
        KeyPair kp1 = SecurityUtilities.generateKeyPair();
        X509Certificate cert1 = SecurityUtilities.makeV1Certificate(kp1.getPrivate(), kp1.getPublic(), name1);

        keyStore1 = KeyStore.getInstance(KEYSTORE_TYPE, PROVIDER);
        trustStore2 = KeyStore.getInstance(KEYSTORE_TYPE, PROVIDER);


        keyStore1.load(null, null);
        keyStore1.setKeyEntry(name1, kp1.getPrivate(), "relaypass".toCharArray(), new X509Certificate[]{cert1});


        trustStore2.load(null, null);
        trustStore2.setCertificateEntry(name2, cert1);

//        secureSocketManager = new SecureSocketManager(keyStore1, password);
    }




    @Before
    public void init() throws IOException, GeneralSecurityException, InterruptedException, ExecutionException {
        
        // THIS CODE BLOCK CALLS getSSLServerSocket() and getSSLSocketFactory() AND USES THEM WITH TWO CALLABLE THREADS
        // TO ESTABLISH A CONNECTION 
        SSLServerSocket sslServerSocket = getSSLServerSocket();
        SSLSocketFactory sslSocketFactory = getSSLSocketFactory();
        ExecutorService pool = Executors.newFixedThreadPool(2);

        Callable<SSLSocket> c1 = () -> {
            return (SSLSocket) sslServerSocket.accept();
        };

        Callable<SSLSocket> c2 = () -> {
            return (SSLSocket) sslSocketFactory.createSocket("localhost", 2048);
        };

        Future<SSLSocket> server = pool.submit(c1);
        Thread.sleep(1000);
        Future<SSLSocket> client = pool.submit(c2);
        Thread.sleep(1000);
        serverSocket = server.get();
        clientSocket = client.get();
    }

    @After
    public void tearDown(){
        serverSocket = null;
        clientSocket = null;
    }

    @org.junit.Test
    public void testSession(){
        
        // SUCCESSFULLY RETURNS FROM getOutputStream()
            Thread test = new Thread(new ReceiverClientThread(serverSocket));

            test.start();
            try (ObjectOutputStream output = new ObjectOutputStream(new BufferedOutputStream(clientSocket.getOutputStream()))) {
                System.out.println("here");
            }catch (IOException e){
                fail();
            }

    }

    private SSLServerSocket getSSLServerSocket() throws GeneralSecurityException, IOException {
        char[] entryPassword = "relaypass".toCharArray();
        // COULD ADD PROVIDER IN THESE FOR CONSISTENCY
        KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance("PKIX", "BCJSSE");
        keyManagerFactory.init(keyStore1, entryPassword);

        // specify TLS version e.g. TLSv1.3
        SSLContext sslContext = SSLContext.getInstance(TLS_VERSION, "BCJSSE");
        sslContext.init(keyManagerFactory.getKeyManagers(),null, null);

        SSLServerSocketFactory fact = sslContext.getServerSocketFactory();
        return (SSLServerSocket) fact.createServerSocket(2048 );
    }

    private SSLSocketFactory getSSLSocketFactory() throws GeneralSecurityException{

        char[] entryPassword = "relaypass".toCharArray();
        // COULD ADD PROVIDER IN THESE FOR CONSISTENCY
//        KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(KEY_MANAGER, "BCJSSE");
//        keyManagerFactory.init(keyStore1, entryPassword);

        TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance("PKIX", "BCJSSE");
        trustManagerFactory.init(trustStore2);
        // specify TLS version e.g. TLSv1.3
        SSLContext sslContext = SSLContext.getInstance(TLS_VERSION, "BCJSSE");
        sslContext.init(null,trustManagerFactory.getTrustManagers(), null);
       return  sslContext.getSocketFactory();
    }


}

public class ReceiverClientThread implements Runnable {

    private final SSLSocket sslSocket;


    public ReceiverClientThread(SSLSocket sslSocket) {
        this.sslSocket = sslSocket;

    }

    public void run() {

            try (ObjectInputStream input = new ObjectInputStream(new BufferedInputStream(sslSocket.getInputStream()))) {

                System.out.println("here");
            } catch (IOException e) {
            }
        }

}

 add.addActionListener (new ActionListener () {
public void actionPerformed (ActionEvent e) {
c4 = new JComboBox ();
req1 ();
panel_2.add (c4);
panel_2.revalidate ();
}

<pre>btnGenerateRdf.addActionListener (new ActionListener () {
public void actionPerformed (ActionEvent arg0) {
String u = c2.getSelectedItem (). ToString ();
String uu = c4.getSelectedItem (). ToString ();

Model model = ModelFactory.createDefaultModel ();
String u1 = u.substring (u.lastIndexOf ("#") + 1);
String str = u1.replace ('_', '');
String uu1 = uu.substring (uu.lastIndexOf ("#") + 1);
String str1 = uu1.replace ('_', '');
    

Resource node = model.createResource (u)
.addProperty (VCARD.N,
model.createResource ()
.addProperty (FOAF.name, str));


Resource node1 = model.createResource (uu)
.addProperty (VCARD.N,
model.createResource ()
.addProperty (FOAF.name, str1));



Resource node11 = model.createResource (uu)
.addProperty (VCARD.N,
model.createResource ()
.addProperty (FOAF.name, str1));
String s = c4.getSelectedItem (). ToString ();
if (add.getActionListeners ()! = null)
{
Resource [] nodes = new Resource [panel_2.getComponentCount () - 2];
for (int i = 0; i <panel_2.getComponentCount () - 2; i ++)

{
String s1 = s.substring (s.lastIndexOf ("#") + 1); // to get the final substring
String s2 = s1.replace ('_', '');
nodes [i] = model.createResource (s)
.addProperty (VCARD.N,
model.createResource ()
.addProperty (FOAF.name, s2));


}}


try {
FileOutputStream fout = new FileOutputStream ("C: \\ Users \\ me \\ Desktop \\ file2.xml");
model.write (fout);
} catch (IOException e) {
System.out.println ("Exception caught" + e.getMessage ());
}
}
});

List<Student> studentList= new LinkedList<>();
        studentList.add(new Student(1, "Test1", "US"));
        studentList.add(new Student(2, "Test2", "US"));
        studentList.add(new Student(3, "Test3", "India"));
        studentList.add(new Student(4, "Test4", "Canada"));
        studentList.add(new Student(5, "Test5", "Canada"));
        studentList.add(new Student(6, "Test6", "India"));

{US=[Test1, Test2], India=[Test3, Test6], Canada=[Test4, Test5]}

private void getDetailsGroupByCity(List<Student> studentList)
    {
        Map<String,ArrayList<String>> studentHashMap= new HashMap<>();
        List<Student> arrayList= new ArrayList<>(studentList);
        List<String> names= new ArrayList<>();

        Set<String> setKey= new HashSet<>();
        for (Student student : arrayList) {
            setKey.add(student.getCity());
        }
        for (String s : setKey) {
            for (Student student : arrayList) {
                if (s==student.getCity())
                {
                    names.add(student.getName());
                    studentHashMap.put(s, (ArrayList<String>) names);
                }
            }
            names= new ArrayList<>();
        }

        System.out.println(studentHashMap);
    }